Re: Precision termination for VNA
At 16:39 07-01-13, you wrote:
A bit off topic, but I run across this on eBay
<>
Wow! I would like to see an S11 plot... Marco IK1ODO
|
Precision termination for VNA
A bit off topic, but I run across this on eBay
Dave
|
Hi,
I am looking for 2 single wide Tektronix 7K plugin frames. I do not need the pcb but will need all the frame parts with the rear bracket and locking parts. Side panels are not required. I also need 2 6pdt switches with push on-push off. They must have at least 2 amp per contact rating and be less than 1 inch wide. Panel mount is desirable. Please contact off-list. I can send a double wide frame if wanted.
Jerry Massengale
|
Thanks Max - sorry for the noise. Steve Sent from my iPod On Jan 6, 2013, at 8:37 PM, "Max Robinson" <max@...> wrote: I get these on my list from time to time. they usually mean that the
apparent sender's account has been hacked.
Regards.
Max. K 4 O DS.
----- Original Message -----
From: "STEVE REEVES" steve_reeves@...>
To: hp_agilent_equipment@...>; stevreev@...>;
johnbowen@...>; 4dimag_krdy4749mjzg@...>;
albertreeves@...>; donna_reeves@...>;
steve_reeves@...>; saving_mvwy2395rit@...>;
tmiller@...>
Sent: Sunday, January 06, 2013 8:58 AM
Subject: [hp_agilent_equipment] (unknown)
[Non-text portions of this message have been removed]
------------------------------------
Yahoo! Groups Links
[Non-text portions of this message have been removed]
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Re: 3457A and other meter low resistance tips?
I was moved from CT to FL by Dictaphone (Melbourne), and from FL to CO
by StorageTek. Of the three, I prefer Melbourne. Some day I may go back.
Dave
toggle quoted message
Show quoted text
On 1/6/2013 11:31 PM, Harvey White wrote:
On Sun, 6 Jan 2013 20:20:53 -0600, you wrote:
It is.
However, there is the issue of property taxes and insurance in FL. A couple
of years ago, there was a net loss of population from FL.
I live in the panhandle and enjoy the climate but I don't think there is any
place in the country you can go to escape the tax/insurance issue, only try
to 'optimize' for a period of time.
And make tradeoffs, sales tax vs. property tax vs income tax vs cost
of living, etc.
However, the central Florida region (say Orlando), has some nice
advantages, a surplus store that actually is an electronics surplus
store, and at least two good hamfests. The theme parks can also be
nice. Down sides are some of the cost of living, the lightning
(depending on location), and some aspects of the weather.
We like it, though.
Harvey
Joe
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>] On Behalf Of Tom Miller
Sent: Sunday, January 06, 2013 8:13 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
A really good friend of ours moved to Ft Myers two years ago and keeps
pinging on us to get down there. With taxes expected to really explode up
here, we are both thinking of doing just that.
Is homesteading still going on in Fla. ?
Tom
----- Original Message -----
From: Harvey White
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Sent: Sunday, January 06, 2013 9:03 PM
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
On Sun, 06 Jan 2013 20:37:07 -0500, you wrote:
Joe, you really need to consider moving up to here in Maryland.
Preferably
next door. :)
I moved away from Maryland, many years ago, had to do with no job....
Ended up in Florida....
Move down here....
Harvey
Best regards,
Tom
----- Original Message -----
From: J. L. Trantham
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Sent: Sunday, January 06, 2013 8:27 PM
Subject: RE: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
You can never have too many meters. It's like your wife's shoes.
However, you need to pick one of the litter to send to whomever for a
formal
calibration. I opt for sending them to their respective manufacturers.
That's why I think you should send the 3457A to Agilent. You will get the
'before' and 'after' data that will either give you great confidence in the
meter or shake your faith to the core, until you send it back to
Agilent
in
a year for another round of 'before' and 'after' data.
I have two HP 3458A's and two Solartron 7081's that have been to their
respective manufacturers (HP and Ametek, twice for the Solartrons) for
calibration. Reading a Fluke 731B that I obtained from theBay, set to 10
V,
they are within about 15 uV of each other and quite close to 10.000000 VDC.
Therefore, I conclude that the 731B is 'accurate' and the meters are
calibrated. I don't think I can get any closer than that without building
my own environmental facility and reference. Not likely as a hobby.
However, I now have the 'tools' to do a good calibration of some HP
432A
power meters and their calibrators plus a load of other items.
Enjoy!!!!!! And I hope you get to see your family from time to
time. :^)
Joe
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff Machesky
Sent: Sunday, January 06, 2013 7:04 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
Too funny. Well I've already got 5 meters of decent quality and I'm looking
for more. It's also sad when I'm building up power supplies to get
1000v
DC
and 1000V AC at various frequencies to calibrate items like the DMM on my
2465BDM. I don't need 1000, buy hey I figured I may as well have
overhead.
Think those little gator clip wires from ebay are safe at 1000v,
lol. I've
already managed to kill 1000 piv rated diodes.
I also partake in the crazy practice of joining my fixed 1000v
supply with
my 30 volt isolated lab supply to tweak to precise high voltages.
Pretty stupid practice..but someones got to do it. The only saving
grace
is
the current is at least limited to about 100ma..not that it would save me.
I have the dilemma that if I get a calibrated voltage reference and it
disagrees with the 3457A then I'll naturally have to do one of two
things.
Send it off to Agilent to get the meter calibrated, or self
calibrate so
the
3457A agrees with my reference. The ladder has the advantage of not having
a
reference around that disagrees with the meter. If I send it off to Agilent
I'll always question who was right, did the tech do a sloppy job..etc..etc.
Ohh and the ranges also have to exactly agree with each other or it's back
for calibration. Surprisingly they do now.
Insanity is doing the same thing over and over and expecting different
results. Wonder how that plays in with calibration.
Jeff
On 1/6/2013 5:02 PM, Don Black wrote:
he only sure way is to stick your finger in the light socket and
guess.
Don Black.
On 07-Jan-13 10:08 AM, Dave Daniel wrote:
Unless all three voltmeters disagree. Then he needs n more
until at
least two agree. Then again, what if more than one pair agree, but
with different values? Then I guess he needs a fifth meter which
agrees with one of the pairs which agree.
As you said, it's addicting and it makes my brain hurt.
Dave
On 1/6/2013 3:38 PM, J. L. Trantham wrote:
A man with one voltmeter knows what the voltage is. A man
with two
is never quite sure. Therefore he needs a third. :^)
Careful. This stuff is addicting.
Joe
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 2:58 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
Thanks again for the info.
Hmm, to join such a group and come in as a total newb might be a
bit of
a humbling experience. Then again I have to admit I'm enjoying
attempting to get the precision. Even just working with the
Hamon
dividers and monitoring temperatures and matching resistors to
precision
is kind of entertaining. It's however not very productive. I'm
very clear with my wife that my "hobby" is all about learning
for
me, it's not about trying to improve the garage door opener.
Once
in a
while I'll
make something cool that gets used, but it's not my goal. I may
join them just to get an education on what I'm clueless about
from
their point of view.
Thanks,
Jeff
On 1/6/2013 1:32 PM, Steve Byan wrote:
On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
<mailto:jltran%40att.net>
wrote: It's called 'volt-nuts'. More fully, the volt-nuts mailing list --
volt-nuts@... <mailto:volt-nuts%40febo.com>
To subscribe, go to
Best regards,
-Steve
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 1:08 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] Re: 3457A and other
meter
low resistance
tips?
Do they have a club for people with a certain number of
digits
on their multimeters. I feel they should as it's a
whole new
world. --
Steve Byan stevebyan@... <mailto:stevebyan%40me.com> >
Littleton, MA 01460
------------------------------------
Yahoo! Groups Links
------------------------------------
Yahoo! Groups Links
|
Re: 3457A and other meter low resistance tips?
On Sun, 6 Jan 2013 20:20:53 -0600, you wrote: It is.
However, there is the issue of property taxes and insurance in FL. A couple
of years ago, there was a net loss of population from FL.
I live in the panhandle and enjoy the climate but I don't think there is any
place in the country you can go to escape the tax/insurance issue, only try
to 'optimize' for a period of time.
And make tradeoffs, sales tax vs. property tax vs income tax vs cost of living, etc. However, the central Florida region (say Orlando), has some nice advantages, a surplus store that actually is an electronics surplus store, and at least two good hamfests. The theme parks can also be nice. Down sides are some of the cost of living, the lightning (depending on location), and some aspects of the weather. We like it, though. Harvey
Joe
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of Tom Miller
Sent: Sunday, January 06, 2013 8:13 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
A really good friend of ours moved to Ft Myers two years ago and keeps
pinging on us to get down there. With taxes expected to really explode up
here, we are both thinking of doing just that.
Is homesteading still going on in Fla. ?
Tom
----- Original Message -----
From: Harvey White
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Sent: Sunday, January 06, 2013 9:03 PM
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
On Sun, 06 Jan 2013 20:37:07 -0500, you wrote:
Joe, you really need to consider moving up to here in Maryland. Preferably next door. :)
I moved away from Maryland, many years ago, had to do with no job....
Ended up in Florida....
Move down here....
Harvey
Best regards,
Tom
----- Original Message -----
From: J. L. Trantham
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Sent: Sunday, January 06, 2013 8:27 PM
Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance tips?
You can never have too many meters. It's like your wife's shoes.
However, you need to pick one of the litter to send to whomever for a
formal
calibration. I opt for sending them to their respective manufacturers.
That's why I think you should send the 3457A to Agilent. You will get the
'before' and 'after' data that will either give you great confidence in the
meter or shake your faith to the core, until you send it back to Agilent in
a year for another round of 'before' and 'after' data.
I have two HP 3458A's and two Solartron 7081's that have been to their
respective manufacturers (HP and Ametek, twice for the Solartrons) for
calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V,
they are within about 15 uV of each other and quite close to 10.000000 VDC.
Therefore, I conclude that the 731B is 'accurate' and the meters are
calibrated. I don't think I can get any closer than that without building
my own environmental facility and reference. Not likely as a hobby.
However, I now have the 'tools' to do a good calibration of some HP 432A
power meters and their calibrators plus a load of other items.
Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
Joe
-----Original Message-----
From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Jeff Machesky
Sent: Sunday, January 06, 2013 7:04 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
Too funny. Well I've already got 5 meters of decent quality and I'm looking
for more. It's also sad when I'm building up power supplies to get 1000v DC
and 1000V AC at various frequencies to calibrate items like the DMM on my
2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
Think those little gator clip wires from ebay are safe at 1000v, lol. I've
already managed to kill 1000 piv rated diodes.
I also partake in the crazy practice of joining my fixed 1000v supply with
my 30 volt isolated lab supply to tweak to precise high voltages.
Pretty stupid practice..but someones got to do it. The only saving grace is
the current is at least limited to about 100ma..not that it would save me.
I have the dilemma that if I get a calibrated voltage reference and it
disagrees with the 3457A then I'll naturally have to do one of two things.
Send it off to Agilent to get the meter calibrated, or self calibrate so the
3457A agrees with my reference. The ladder has the advantage of not having a
reference around that disagrees with the meter. If I send it off to Agilent
I'll always question who was right, did the tech do a sloppy job..etc..etc.
Ohh and the ranges also have to exactly agree with each other or it's back
for calibration. Surprisingly they do now.
Insanity is doing the same thing over and over and expecting different
results. Wonder how that plays in with calibration.
Jeff
On 1/6/2013 5:02 PM, Don Black wrote:
he only sure way is to stick your finger in the light socket and guess.
Don Black.
On 07-Jan-13 10:08 AM, Dave Daniel wrote:
Unless all three voltmeters disagree. Then he needs n more until at
least two agree. Then again, what if more than one pair agree, but
with different values? Then I guess he needs a fifth meter which
agrees with one of the pairs which agree.
As you said, it's addicting and it makes my brain hurt.
Dave
On 1/6/2013 3:38 PM, J. L. Trantham wrote:
A man with one voltmeter knows what the voltage is. A man with two
is never quite sure. Therefore he needs a third. :^)
Careful. This stuff is addicting.
Joe
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 2:58 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
Thanks again for the info.
Hmm, to join such a group and come in as a total newb might be a
bit of
a humbling experience. Then again I have to admit I'm enjoying
attempting to get the precision. Even just working with the Hamon
dividers and monitoring temperatures and matching resistors to
precision
is kind of entertaining. It's however not very productive. I'm
very clear with my wife that my "hobby" is all about learning for
me, it's not about trying to improve the garage door opener. Once
in a
while I'll
make something cool that gets used, but it's not my goal. I may
join them just to get an education on what I'm clueless about from
their point of view.
Thanks,
Jeff
On 1/6/2013 1:32 PM, Steve Byan wrote:
On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
<mailto:jltran%40att.net>
wrote: It's called 'volt-nuts'. More fully, the volt-nuts mailing list -- volt-nuts@...
<mailto:volt-nuts%40febo.com>
To subscribe, go to
Best regards,
-Steve
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 1:08 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
low resistance
tips?
Do they have a club for people with a certain number of digits
on their multimeters. I feel they should as it's a
whole new
world. --
Steve Byan stevebyan@... <mailto:stevebyan%40me.com> >
Littleton, MA 01460
------------------------------------
Yahoo! Groups Links
------------------------------------
Yahoo! Groups Links
|
Re: 3457A and other meter low resistance tips?
On Sun, 06 Jan 2013 21:13:10 -0500, you wrote: A really good friend of ours moved to Ft Myers two years ago and keeps pinging on us to get down there. With taxes expected to really explode up here, we are both thinking of doing just that.
Is homesteading still going on in Fla. ? You do get a 25K discount off the assessed value of your house for property tax purposes if you live in it (and it's the primary residence). Depending on your age, there might be other discounts as well. Harvey
Tom
----- Original Message -----
From: Harvey White
To: hp_agilent_equipment@...
Sent: Sunday, January 06, 2013 9:03 PM
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance tips?
On Sun, 06 Jan 2013 20:37:07 -0500, you wrote:
>Joe, you really need to consider moving up to here in Maryland. Preferably next door. :)
I moved away from Maryland, many years ago, had to do with no job....
Ended up in Florida....
Move down here....
Harvey
>
>Best regards,
>Tom
>
> ----- Original Message -----
> From: J. L. Trantham
> To: hp_agilent_equipment@...
> Sent: Sunday, January 06, 2013 8:27 PM
> Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance tips?
>
>
>
> You can never have too many meters. It's like your wife's shoes.
>
> However, you need to pick one of the litter to send to whomever for a formal
> calibration. I opt for sending them to their respective manufacturers.
>
> That's why I think you should send the 3457A to Agilent. You will get the
> 'before' and 'after' data that will either give you great confidence in the
> meter or shake your faith to the core, until you send it back to Agilent in
> a year for another round of 'before' and 'after' data.
>
> I have two HP 3458A's and two Solartron 7081's that have been to their
> respective manufacturers (HP and Ametek, twice for the Solartrons) for
> calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V,
> they are within about 15 uV of each other and quite close to 10.000000 VDC.
> Therefore, I conclude that the 731B is 'accurate' and the meters are
> calibrated. I don't think I can get any closer than that without building
> my own environmental facility and reference. Not likely as a hobby.
> However, I now have the 'tools' to do a good calibration of some HP 432A
> power meters and their calibrators plus a load of other items.
>
> Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
>
> Joe
>
> -----Original Message-----
> From: hp_agilent_equipment@...
> [mailto:hp_agilent_equipment@...] On Behalf Of Jeff Machesky
> Sent: Sunday, January 06, 2013 7:04 PM
> To: hp_agilent_equipment@...
> Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
> tips?
>
> Too funny. Well I've already got 5 meters of decent quality and I'm looking
> for more. It's also sad when I'm building up power supplies to get 1000v DC
> and 1000V AC at various frequencies to calibrate items like the DMM on my
> 2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
> Think those little gator clip wires from ebay are safe at 1000v, lol. I've
> already managed to kill 1000 piv rated diodes.
> I also partake in the crazy practice of joining my fixed 1000v supply with
> my 30 volt isolated lab supply to tweak to precise high voltages.
> Pretty stupid practice..but someones got to do it. The only saving grace is
> the current is at least limited to about 100ma..not that it would save me.
>
> I have the dilemma that if I get a calibrated voltage reference and it
> disagrees with the 3457A then I'll naturally have to do one of two things.
> Send it off to Agilent to get the meter calibrated, or self calibrate so the
> 3457A agrees with my reference. The ladder has the advantage of not having a
> reference around that disagrees with the meter. If I send it off to Agilent
> I'll always question who was right, did the tech do a sloppy job..etc..etc.
> Ohh and the ranges also have to exactly agree with each other or it's back
> for calibration. Surprisingly they do now.
>
> Insanity is doing the same thing over and over and expecting different
> results. Wonder how that plays in with calibration.
>
> Jeff
>
> On 1/6/2013 5:02 PM, Don Black wrote:
> >
> > he only sure way is to stick your finger in the light socket and guess.
> >
> > Don Black.
> >
> > On 07-Jan-13 10:08 AM, Dave Daniel wrote:
> > >
> > > Unless all three voltmeters disagree. Then he needs n more until at
> > > least two agree. Then again, what if more than one pair agree, but
> > > with different values? Then I guess he needs a fifth meter which
> > > agrees with one of the pairs which agree.
> > >
> > > As you said, it's addicting and it makes my brain hurt.
> > >
> > > Dave
> > >
> > > On 1/6/2013 3:38 PM, J. L. Trantham wrote:
> > > >
> > > > A man with one voltmeter knows what the voltage is. A man with two
> > > > is never quite sure. Therefore he needs a third. :^)
> > > >
> > > > Careful. This stuff is addicting.
> > > >
> > > > Joe
> > > >
> > > > -----Original Message-----
> > > > From: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > [mailto:hp_agilent_equipment@...
> >
> > >
> > > > ] On Behalf Of Jeff
> > > > Machesky
> > > > Sent: Sunday, January 06, 2013 2:58 PM
> > > > To: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > Subject: Re: [hp_agilent_equipment] 3457A and other meter low
> > resistance
> > > > tips?
> > > >
> > > > Thanks again for the info.
> > > >
> > > > Hmm, to join such a group and come in as a total newb might be a
> > bit of
> > > > a humbling experience. Then again I have to admit I'm enjoying
> > > > attempting to get the precision. Even just working with the Hamon
> > > > dividers and monitoring temperatures and matching resistors to
> > precision
> > > > is kind of entertaining. It's however not very productive. I'm
> > > > very clear with my wife that my "hobby" is all about learning for
> > > > me, it's not about trying to improve the garage door opener. Once
> > > > in a
> > while I'll
> > > > make something cool that gets used, but it's not my goal. I may
> > > > join them just to get an education on what I'm clueless about from
> > > > their point of view.
> > > >
> > > > Thanks,
> > > >
> > > > Jeff
> > > >
> > > > On 1/6/2013 1:32 PM, Steve Byan wrote:
> > > > >
> > > > >
> > > > > On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
> >
> > >
> > > >
> > > > > > wrote:
> > > > >
> > > > > > It's called 'volt-nuts'.
> > > > >
> > > > > More fully, the volt-nuts mailing list -- volt-nuts@...
> >
> > >
> > > >
> > > > >
> > > > >
> > > > > To subscribe, go to
> > > > >
> > > > >
> > > > > Best regards,
> > > > > -Steve
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > >
> > > > > > [mailto:hp_agilent_equipment@...
> >
> > >
> > > >
> > > > > ] On Behalf Of Jeff
> > > > > Machesky
> > > > > > Sent: Sunday, January 06, 2013 1:08 PM
> > > > > > To: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > >
> > > > > > Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
> > > > > > low
> > > > > resistance
> > > > > > tips?
> > > > > >
> > > > > >
> > > > > >
> > > > > > Do they have a club for people with a certain number of digits
> > > > > > on their multimeters. I feel they should as it's a
> > > whole new
> > > > > > world.
> > > > >
> > > > > --
> > > > > Steve Byan stevebyan@... >
> > > > > Littleton, MA 01460
> > > > >
> > > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>
>
|
Re: Was HP 8590A fails Calibration Routines Now Unit Saved
Did you take any pictures? Be nice to see what you had to go through.
Tom
toggle quoted message
Show quoted text
----- Original Message -----
From: stever1k
To: hp_agilent_equipment@...
Sent: Monday, January 07, 2013 12:56 AM
Subject: [hp_agilent_equipment] Was HP 8590A fails Calibration Routines Now Unit Saved
I got the attenuator apart safely ( big jog) and replaced the two blown resistors in the 10 db pad...Put it all back together and now the 8590a passes all tests....Yea, it has been saved!!
Steve
--- In hp_agilent_equipment@..., "stever1k" wrote:
>
> I have removed the attenuator and tested it and the 10 and 30 db sections are bad. This is a Wavetek 0955-0329 unit and I can not see a way to take it apart to get at the insides. Has anyone done this?? If so how?? I have can not get the ends out that have the SMA connectors on them...Somebody got some ideas??
>
> Steve
>
>
>
> --- In hp_agilent_equipment@..., "stever1k" wrote:
> >
> > I ran some tests on the Attenuator since these are highly suspect all the time because people put too much power into them. Lo and behold it looks like it is blown. I put in a -10 dbm signal and then switched in different atten levels with the soft key and sure enough there were several att levels that were bad. It looks like I have to see if I can fix it, perhaps then it will pass the Cal tests.
> >
> > Steve
> >
> >
> >
> > --- In hp_agilent_equipment@..., "stever1k" wrote:
> > >
> > > My newly acquired HP8590A S/N 2618A01105 seems to work ok but it fails Cal Freq and the Cal Ampltd calibration routines. When these run per the Operating Manual I get the following errors:
> > >
> > > Cal: Span Sens Fail SRQ 110
> > > Cal: Linear Det Fail SRQ 110
> > >
> > > If I understand the Service Manual correctly it appears that the Calibration Data is possibly bad. How do I find good Calibration Data for my unit and how do I best enter it... This is such a fine piece of equipment I hate to give up on it. Any points in the right direction will be helpful.
> > >
> > > Steve
> > >
> >
>
|
Was HP 8590A fails Calibration Routines Now Unit Saved
I got the attenuator apart safely ( big jog) and replaced the two blown resistors in the 10 db pad...Put it all back together and now the 8590a passes all tests....Yea, it has been saved!!
Steve
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "stever1k" wrote:
I have removed the attenuator and tested it and the 10 and 30 db sections are bad. This is a Wavetek 0955-0329 unit and I can not see a way to take it apart to get at the insides. Has anyone done this?? If so how?? I have can not get the ends out that have the SMA connectors on them...Somebody got some ideas??
Steve
--- In hp_agilent_equipment@..., "stever1k" wrote:
I ran some tests on the Attenuator since these are highly suspect all the time because people put too much power into them. Lo and behold it looks like it is blown. I put in a -10 dbm signal and then switched in different atten levels with the soft key and sure enough there were several att levels that were bad. It looks like I have to see if I can fix it, perhaps then it will pass the Cal tests.
Steve
--- In hp_agilent_equipment@..., "stever1k" wrote:
My newly acquired HP8590A S/N 2618A01105 seems to work ok but it fails Cal Freq and the Cal Ampltd calibration routines. When these run per the Operating Manual I get the following errors:
Cal: Span Sens Fail SRQ 110
Cal: Linear Det Fail SRQ 110
If I understand the Service Manual correctly it appears that the Calibration Data is possibly bad. How do I find good Calibration Data for my unit and how do I best enter it... This is such a fine piece of equipment I hate to give up on it. Any points in the right direction will be helpful.
Steve
|
Re: 3457A and other meter low resistance tips?
Supposedly there's North Dakota looking at abolishing property taxes. I
would move in a heartbeat if I wasn't chained to my house in CT.
Best Regards,
Mark A. Weiss, P.E.
<> www.ampexperts.com
-
_____
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of J. L. Trantham
Sent: Sunday, January 06, 2013 9:21 PM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
It is.
However, there is the issue of property taxes and insurance in FL. A couple
of years ago, there was a net loss of population from FL.
I live in the panhandle and enjoy the climate but I don't think there is any
place in the country you can go to escape the tax/insurance issue, only try
to 'optimize' for a period of time.
Joe
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Tom Miller
Sent: Sunday, January 06, 2013 8:13 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
A really good friend of ours moved to Ft Myers two years ago and keeps
pinging on us to get down there. With taxes expected to really explode up
here, we are both thinking of doing just that.
Is homesteading still going on in Fla. ?
Tom
toggle quoted message
Show quoted text
----- Original Message ----- From: Harvey White To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> Sent: Sunday, January 06, 2013 9:03 PM Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance tips? On Sun, 06 Jan 2013 20:37:07 -0500, you wrote: Joe, you really need to consider moving up to here in Maryland. Preferably next door. :) I moved away from Maryland, many years ago, had to do with no job.... Ended up in Florida.... Move down here.... Harvey
Best regards,
Tom
----- Original Message -----
From: J. L. Trantham
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> Sent: Sunday, January 06, 2013 8:27 PM
Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance tips?
You can never have too many meters. It's like your wife's shoes.
However, you need to pick one of the litter to send to whomever for a
formal calibration. I opt for sending them to their respective manufacturers.
That's why I think you should send the 3457A to Agilent. You will get the
'before' and 'after' data that will either give you great confidence in the meter or shake your faith to the core, until you send it back to Agilent in a year for another round of 'before' and 'after' data.
I have two HP 3458A's and two Solartron 7081's that have been to their
respective manufacturers (HP and Ametek, twice for the Solartrons) for
calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V, they are within about 15 uV of each other and quite close to 10.000000 VDC. Therefore, I conclude that the 731B is 'accurate' and the meters are
calibrated. I don't think I can get any closer than that without building
my own environmental facility and reference. Not likely as a hobby.
However, I now have the 'tools' to do a good calibration of some HP 432A
power meters and their calibrators plus a load of other items.
Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
Joe
-----Original Message-----
From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> [mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Jeff Machesky Sent: Sunday, January 06, 2013 7:04 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
Too funny. Well I've already got 5 meters of decent quality and I'm looking for more. It's also sad when I'm building up power supplies to get 1000v DC and 1000V AC at various frequencies to calibrate items like the DMM on my
2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
Think those little gator clip wires from ebay are safe at 1000v, lol. I've
already managed to kill 1000 piv rated diodes.
I also partake in the crazy practice of joining my fixed 1000v supply with
my 30 volt isolated lab supply to tweak to precise high voltages.
Pretty stupid practice..but someones got to do it. The only saving grace is the current is at least limited to about 100ma..not that it would save me.
I have the dilemma that if I get a calibrated voltage reference and it
disagrees with the 3457A then I'll naturally have to do one of two things.
Send it off to Agilent to get the meter calibrated, or self calibrate so the 3457A agrees with my reference. The ladder has the advantage of not having a reference around that disagrees with the meter. If I send it off to Agilent I'll always question who was right, did the tech do a sloppy job..etc..etc. Ohh and the ranges also have to exactly agree with each other or it's back
for calibration. Surprisingly they do now.
Insanity is doing the same thing over and over and expecting different
results. Wonder how that plays in with calibration.
Jeff
On 1/6/2013 5:02 PM, Don Black wrote:
he only sure way is to stick your finger in the light socket and guess.
Don Black.
On 07-Jan-13 10:08 AM, Dave Daniel wrote:
Unless all three voltmeters disagree. Then he needs n more until at
least two agree. Then again, what if more than one pair agree, but
with different values? Then I guess he needs a fifth meter which
agrees with one of the pairs which agree.
As you said, it's addicting and it makes my brain hurt.
Dave
On 1/6/2013 3:38 PM, J. L. Trantham wrote:
A man with one voltmeter knows what the voltage is. A man with two
is never quite sure. Therefore he needs a third. :^)
Careful. This stuff is addicting.
Joe
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 2:58 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
Thanks again for the info.
Hmm, to join such a group and come in as a total newb might be a
bit of
a humbling experience. Then again I have to admit I'm enjoying
attempting to get the precision. Even just working with the Hamon
dividers and monitoring temperatures and matching resistors to
precision
is kind of entertaining. It's however not very productive. I'm
very clear with my wife that my "hobby" is all about learning for
me, it's not about trying to improve the garage door opener. Once
in a
while I'll
make something cool that gets used, but it's not my goal. I may
join them just to get an education on what I'm clueless about from
their point of view.
Thanks,
Jeff
On 1/6/2013 1:32 PM, Steve Byan wrote:
On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
<mailto:jltran%40att.net>
wrote: It's called 'volt-nuts'. More fully, the volt-nuts mailing list -- volt-nuts@...
<mailto:volt-nuts%40febo.com>
To subscribe, go to
Best regards,
-Steve
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 1:08 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
low resistance
tips?
Do they have a club for people with a certain number of digits
on their multimeters. I feel they should as it's a
whole new
world. --
Steve Byan stevebyan@... <mailto:stevebyan%40me.com> >
Littleton, MA 01460
------------------------------------
Yahoo! Groups Links
------------------------------------
Yahoo! Groups Links
|
Re: Frequency / Function Generator for the Hamshack
Jeff,
The 8662A is a very nice low phase noise box with sweep up to 1280MHz but is very heavy (hard to ship) and not so reliable or easy to fix. I have 2 working units plus a parts carcass. I have no personal experience with the 3335A. Good luck with what ever you purchase.
Regards,
Eric
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "W8KZW" wrote:
I'm keeping watch for an HP-8662A or HP-3335A as an all-around frequency
source for my bench.
|
Re: Frequency / Function Generator for the Hamshack
Hi Jeff,
Look for a working 8648A. I like the clean, simple operational front panel control of these units. Has all the features needed for HF, VHF and UHF work to 1GHz.
Regards
Gerald
VK3GJM
toggle quoted message
Show quoted text
I'm keeping watch for an HP-8662A or HP-3335A as an all-around frequency
source for my bench.
Most of what I do ranges from DC to 148 MHz, and about the most complex task
I think I'd do is sweep an IF filter or align a rig. I'd like to use it as
an outboard tracking generator for my HP-8591E also.
I like being able to spin a knob and change frequency ... to rock back and
forth to find an IF center frequency, for example.
Give the application, am I better off with one of the above units vs. the
other? Something else? Price IS a considertion.
Thanks, and forgive me if this has been "asked and answered".
Jeff
W8KZW
|
Re: Frequency / Function Generator for the Hamshack
Hi Jeff,
I doubt you want an 8662A for general purpose applications. I own two, plus two "donor units". They are great when you really need low phase noise, but have downsides.
1) They are huge and heavy.
2) They are very complicated. Lots of little boards living in cavities in an aluminum casting. Difficult to troubleshoot without extender cards.
3) They are not really reliable. A later model might be better, but the old ones were not (say 1985). I don't think it was design so much as complexity and time.
I also own 3 Fluke 6070 and 6071 synthesizers. The 6070 is 512MHz and the 6071 is 1024MHz. These are also big, but have been more reliable and have a better user interface (my opinion). I also think they are simpler and easier to work on. Phase noise above 10KHz is better than the 8662 - below it is quite a bit worse. Downsides are that they are orphans - but Agilent doesn't provide any support for the 8662 either.
I am not sure what you expect from the source. Remember that these things are programmed by microprocessors and you will see glitches as the loops are retuned. You may see clean sweeps on small steps away from areas where a bunch of things get reprogrammed.
Fluke produced a number of other synthesizers, but they were designed for a lower price point. They may be more than adequate for your application. Maybe someone else can comment.
Lew
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "W8KZW" wrote:
I'm keeping watch for an HP-8662A or HP-3335A as an all-around frequency
source for my bench.
Most of what I do ranges from DC to 148 MHz, and about the most complex task
I think I'd do is sweep an IF filter or align a rig. I'd like to use it as
an outboard tracking generator for my HP-8591E also.
I like being able to spin a knob and change frequency ... to rock back and
forth to find an IF center frequency, for example.
Give the application, am I better off with one of the above units vs. the
other? Something else? Price IS a considertion.
Thanks, and forgive me if this has been "asked and answered".
Jeff
W8KZW
|
Re: Frequency / Function Generator for the Hamshack
Hi Jeff,
I can strongly recommend the 8642B although its frequency range substantially exceeds the 2 meter band. That unit is my favorite for receiver work and it will meet all the criteria you mentioned in your post. Of course, used as an external tracking generator, it will operate at a sweep speed which is not synchronized with your SA, but depending upon your desired frequency span it could do an excellent job with the 8591E (which I also own.) The top end of the 8642B is 2.1 GHz which exceeds the 1.9 GHz top end of the 8591E.
I would not recommend the 3335A on the basis that the top frequency is 80 MHz and the minimum RF output is -87 dBm so you will need to use an external attenuator for front-end work. Its strong point is that its calibrated RF output is supposed to be extremely precise, within 0.09 dB. I use that to confirm dBm calibration of my SA at lower frequencies.
I would not recommend the 8165A on the basis that the top frequency is 50 MHz, its frequency stability is relatively poor, and minimum RF output is 10 mV p-p. If you listen to the signal on a SSB or CW receiver, or connect to your SA, set to a narrow bandwidth, you will hear/see the carrier frequency moving around. To further demonstrate how unsuitable it is, the spec sheet actually has a "jitter" spec of 0.1% at frequencies above 1 kHz. I had never before seen a jitter spec on a function generator or RF signal generator. Had I known about that in advance, I would not have bought this unit.
The 8165A is basically a function generator that has a couple of interesting twists: you can have it produce a specific number of pulses, and you can set the duty cycle to 20%, 50%, or 80%. It has no provision to connect an external 10 MHz frequency reference, although that would be useless since the jitter is so pronounced. I own a unit with the option that allows AM and FM modulation.
Good luck with your choice.
73,
Patrick Wong AK6C
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "W8KZW" wrote:
I'm keeping watch for an HP-8662A or HP-3335A as an all-around frequency
source for my bench.
Most of what I do ranges from DC to 148 MHz, and about the most complex task
I think I'd do is sweep an IF filter or align a rig. I'd like to use it as
an outboard tracking generator for my HP-8591E also.
I like being able to spin a knob and change frequency ... to rock back and
forth to find an IF center frequency, for example.
Give the application, am I better off with one of the above units vs. the
other? Something else? Price IS a considertion.
Thanks, and forgive me if this has been "asked and answered".
Jeff
W8KZW
|
Jose,
For sure, and thanks for putting together such a great page on your own 16702 Repair! I found it quite useful to look and and compare to my own.
You know, interestingly enough, I thought this CPU would be in a socket too, but it is actually soldered right onto the board. However, in that same spirit of thought, is re-flowing the board... which may be worth it as a last-ditch effort before I order a replacement. Thanks though!
-Mark
toggle quoted message
Show quoted text
--- In hp_agilent_equipment@..., "Jose V. Gavila" wrote:
Hello Mark,
So, I'm looking for some help in trying to fix a 16702B mainframe with
what appears to be a dead CPU. I'm hoping that someone on this group has
had some similar experience, and might be able to offer me some of their
advice or experiences.
Symptoms:Turns on, blank screen, all buttons lit, but unresponsive.
I've disconnected everything from the main "glue" board, except
for:-Power Switch (J1)-Power control (J8)-Backplane (power source)-3x
Fans-CPU Board-Everything disconnected from CPU board -3V Lithium coin
cell good on CPU board
Still the same symptoms.
I've looked at the PCB's:-Thouroughly inspected - no physical flaws or
blown components-All caps are tantalum and have good ESR's-No parts are
BGA, this is pre-ROHS, so bad solder joints shouldn't be a problem-No
corrosion, water damage, etc..
All voltages from PS are within spec and have approx 50 mVrms
noise.-Unit powers on/off with the front switch
I am getting is sync on the VGA output-34.7 kHz Vert sync pulses-32.0 Hz
Horiz sync pulses
There's nothing on serial (RS-232) output
I've probed around the CPU board with a scope and discovered that:-Power
watchdog circuit (U528 7705AC) is working correctly and releasing the
reset-Clocks are being generated from the appropriate IC's-NO Activity
on the memory anywhere.-NO Activity on the PCI buses-Appears to be some
LIFE in a couple CPLD's (U12, U15) and SRAM (U4) near the CPU -generally
pseudo-random signals around 1MHz
I have access to a thermal camera and:-Everything seems to be "normal"-A
couple parts were a bit warmer than I might have thought, but I looked
up their specs and they are higher power high-speed clock generators
and buffers.-The CPU is also generating heat, but nothing
excessive-Notably, the system RAM is completely cold (yet video RAM is
slightly warm)
All this leads me to believe that my main CPU board is toast, likely
with no way of fixing it. But, almost anything can screw up a CPU system
like this, so who knows?
Assuming I have a bad CPU board, my next question is if CPU boards are
interchangeable between 16700A/16702A and 16700B/16702B? Anyone had some
experience here?
There's some great photos of a 16700A repair here
() and the boards are almost _exactly_
the same, apart from some slightly changed component positions. And, the
16700A's have the same CPU specs (150MHz PA-RISC)¡ Any reason why I
couldn't just buy an old 16700A series unit and swap in the CPU board?
Any and all advice here is appreciated. Thanks so much!! Well, thanks for the kind comments on my 16700A page :-)
Have you tried to reseat the CPU?. I am not 100% sure, but it seems to
me like a press-fitting system and perhaps removing it and cleaning the
CPU and socket contacts could help. I have seen quite a lot of problems
with socketed DRAM modules, so this could be also the case.
Other than this, I think you are right and the best approach is to
locate another CPU board.
Regards,
JOSE
--
73 EB5AGV - JOSE V. GAVILA - IM99sm La Canyada - Valencia(SPAIN)
AGVradio
Personal WEB
|
Re: 3457A and other meter low resistance tips?
It is.
However, there is the issue of property taxes and insurance in FL. A couple
of years ago, there was a net loss of population from FL.
I live in the panhandle and enjoy the climate but I don't think there is any
place in the country you can go to escape the tax/insurance issue, only try
to 'optimize' for a period of time.
Joe
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of Tom Miller
Sent: Sunday, January 06, 2013 8:13 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
A really good friend of ours moved to Ft Myers two years ago and keeps
pinging on us to get down there. With taxes expected to really explode up
here, we are both thinking of doing just that.
Is homesteading still going on in Fla. ?
Tom
toggle quoted message
Show quoted text
----- Original Message ----- From: Harvey White To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> Sent: Sunday, January 06, 2013 9:03 PM Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance tips? On Sun, 06 Jan 2013 20:37:07 -0500, you wrote: Joe, you really need to consider moving up to here in Maryland. Preferably next door. :) I moved away from Maryland, many years ago, had to do with no job.... Ended up in Florida.... Move down here.... Harvey
Best regards,
Tom
----- Original Message -----
From: J. L. Trantham
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> Sent: Sunday, January 06, 2013 8:27 PM
Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance tips?
You can never have too many meters. It's like your wife's shoes.
However, you need to pick one of the litter to send to whomever for a
formal calibration. I opt for sending them to their respective manufacturers.
That's why I think you should send the 3457A to Agilent. You will get the
'before' and 'after' data that will either give you great confidence in the meter or shake your faith to the core, until you send it back to Agilent in a year for another round of 'before' and 'after' data.
I have two HP 3458A's and two Solartron 7081's that have been to their
respective manufacturers (HP and Ametek, twice for the Solartrons) for
calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V, they are within about 15 uV of each other and quite close to 10.000000 VDC. Therefore, I conclude that the 731B is 'accurate' and the meters are
calibrated. I don't think I can get any closer than that without building
my own environmental facility and reference. Not likely as a hobby.
However, I now have the 'tools' to do a good calibration of some HP 432A
power meters and their calibrators plus a load of other items.
Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
Joe
-----Original Message-----
From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> [mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Jeff Machesky Sent: Sunday, January 06, 2013 7:04 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
Too funny. Well I've already got 5 meters of decent quality and I'm looking for more. It's also sad when I'm building up power supplies to get 1000v DC and 1000V AC at various frequencies to calibrate items like the DMM on my
2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
Think those little gator clip wires from ebay are safe at 1000v, lol. I've
already managed to kill 1000 piv rated diodes.
I also partake in the crazy practice of joining my fixed 1000v supply with
my 30 volt isolated lab supply to tweak to precise high voltages.
Pretty stupid practice..but someones got to do it. The only saving grace is the current is at least limited to about 100ma..not that it would save me.
I have the dilemma that if I get a calibrated voltage reference and it
disagrees with the 3457A then I'll naturally have to do one of two things.
Send it off to Agilent to get the meter calibrated, or self calibrate so the 3457A agrees with my reference. The ladder has the advantage of not having a reference around that disagrees with the meter. If I send it off to Agilent I'll always question who was right, did the tech do a sloppy job..etc..etc. Ohh and the ranges also have to exactly agree with each other or it's back
for calibration. Surprisingly they do now.
Insanity is doing the same thing over and over and expecting different
results. Wonder how that plays in with calibration.
Jeff
On 1/6/2013 5:02 PM, Don Black wrote:
he only sure way is to stick your finger in the light socket and guess.
Don Black.
On 07-Jan-13 10:08 AM, Dave Daniel wrote:
Unless all three voltmeters disagree. Then he needs n more until at
least two agree. Then again, what if more than one pair agree, but
with different values? Then I guess he needs a fifth meter which
agrees with one of the pairs which agree.
As you said, it's addicting and it makes my brain hurt.
Dave
On 1/6/2013 3:38 PM, J. L. Trantham wrote:
A man with one voltmeter knows what the voltage is. A man with two
is never quite sure. Therefore he needs a third. :^)
Careful. This stuff is addicting.
Joe
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 2:58 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
Thanks again for the info.
Hmm, to join such a group and come in as a total newb might be a
bit of
a humbling experience. Then again I have to admit I'm enjoying
attempting to get the precision. Even just working with the Hamon
dividers and monitoring temperatures and matching resistors to
precision
is kind of entertaining. It's however not very productive. I'm
very clear with my wife that my "hobby" is all about learning for
me, it's not about trying to improve the garage door opener. Once
in a
while I'll
make something cool that gets used, but it's not my goal. I may
join them just to get an education on what I'm clueless about from
their point of view.
Thanks,
Jeff
On 1/6/2013 1:32 PM, Steve Byan wrote:
On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
<mailto:jltran%40att.net>
wrote: It's called 'volt-nuts'. More fully, the volt-nuts mailing list -- volt-nuts@...
<mailto:volt-nuts%40febo.com>
To subscribe, go to
Best regards,
-Steve
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 1:08 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
low resistance
tips?
Do they have a club for people with a certain number of digits
on their multimeters. I feel they should as it's a
whole new
world. --
Steve Byan stevebyan@... <mailto:stevebyan%40me.com> >
Littleton, MA 01460
------------------------------------
Yahoo! Groups Links
------------------------------------
Yahoo! Groups Links
|
Re: 3457A and other meter low resistance tips?
A really good friend of ours moved to Ft Myers two years ago and keeps pinging on us to get down there. With taxes expected to really explode up here, we are both thinking of doing just that.
Is homesteading still going on in Fla. ?
Tom
toggle quoted message
Show quoted text
----- Original Message -----
From: Harvey White
To: hp_agilent_equipment@...
Sent: Sunday, January 06, 2013 9:03 PM
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance tips?
On Sun, 06 Jan 2013 20:37:07 -0500, you wrote:
>Joe, you really need to consider moving up to here in Maryland. Preferably next door. :)
I moved away from Maryland, many years ago, had to do with no job....
Ended up in Florida....
Move down here....
Harvey
>
>Best regards,
>Tom
>
> ----- Original Message -----
> From: J. L. Trantham
> To: hp_agilent_equipment@...
> Sent: Sunday, January 06, 2013 8:27 PM
> Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance tips?
>
>
>
> You can never have too many meters. It's like your wife's shoes.
>
> However, you need to pick one of the litter to send to whomever for a formal
> calibration. I opt for sending them to their respective manufacturers.
>
> That's why I think you should send the 3457A to Agilent. You will get the
> 'before' and 'after' data that will either give you great confidence in the
> meter or shake your faith to the core, until you send it back to Agilent in
> a year for another round of 'before' and 'after' data.
>
> I have two HP 3458A's and two Solartron 7081's that have been to their
> respective manufacturers (HP and Ametek, twice for the Solartrons) for
> calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V,
> they are within about 15 uV of each other and quite close to 10.000000 VDC.
> Therefore, I conclude that the 731B is 'accurate' and the meters are
> calibrated. I don't think I can get any closer than that without building
> my own environmental facility and reference. Not likely as a hobby.
> However, I now have the 'tools' to do a good calibration of some HP 432A
> power meters and their calibrators plus a load of other items.
>
> Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
>
> Joe
>
> -----Original Message-----
> From: hp_agilent_equipment@...
> [mailto:hp_agilent_equipment@...] On Behalf Of Jeff Machesky
> Sent: Sunday, January 06, 2013 7:04 PM
> To: hp_agilent_equipment@...
> Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
> tips?
>
> Too funny. Well I've already got 5 meters of decent quality and I'm looking
> for more. It's also sad when I'm building up power supplies to get 1000v DC
> and 1000V AC at various frequencies to calibrate items like the DMM on my
> 2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
> Think those little gator clip wires from ebay are safe at 1000v, lol. I've
> already managed to kill 1000 piv rated diodes.
> I also partake in the crazy practice of joining my fixed 1000v supply with
> my 30 volt isolated lab supply to tweak to precise high voltages.
> Pretty stupid practice..but someones got to do it. The only saving grace is
> the current is at least limited to about 100ma..not that it would save me.
>
> I have the dilemma that if I get a calibrated voltage reference and it
> disagrees with the 3457A then I'll naturally have to do one of two things.
> Send it off to Agilent to get the meter calibrated, or self calibrate so the
> 3457A agrees with my reference. The ladder has the advantage of not having a
> reference around that disagrees with the meter. If I send it off to Agilent
> I'll always question who was right, did the tech do a sloppy job..etc..etc.
> Ohh and the ranges also have to exactly agree with each other or it's back
> for calibration. Surprisingly they do now.
>
> Insanity is doing the same thing over and over and expecting different
> results. Wonder how that plays in with calibration.
>
> Jeff
>
> On 1/6/2013 5:02 PM, Don Black wrote:
> >
> > he only sure way is to stick your finger in the light socket and guess.
> >
> > Don Black.
> >
> > On 07-Jan-13 10:08 AM, Dave Daniel wrote:
> > >
> > > Unless all three voltmeters disagree. Then he needs n more until at
> > > least two agree. Then again, what if more than one pair agree, but
> > > with different values? Then I guess he needs a fifth meter which
> > > agrees with one of the pairs which agree.
> > >
> > > As you said, it's addicting and it makes my brain hurt.
> > >
> > > Dave
> > >
> > > On 1/6/2013 3:38 PM, J. L. Trantham wrote:
> > > >
> > > > A man with one voltmeter knows what the voltage is. A man with two
> > > > is never quite sure. Therefore he needs a third. :^)
> > > >
> > > > Careful. This stuff is addicting.
> > > >
> > > > Joe
> > > >
> > > > -----Original Message-----
> > > > From: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > [mailto:hp_agilent_equipment@...
> >
> > >
> > > > ] On Behalf Of Jeff
> > > > Machesky
> > > > Sent: Sunday, January 06, 2013 2:58 PM
> > > > To: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > Subject: Re: [hp_agilent_equipment] 3457A and other meter low
> > resistance
> > > > tips?
> > > >
> > > > Thanks again for the info.
> > > >
> > > > Hmm, to join such a group and come in as a total newb might be a
> > bit of
> > > > a humbling experience. Then again I have to admit I'm enjoying
> > > > attempting to get the precision. Even just working with the Hamon
> > > > dividers and monitoring temperatures and matching resistors to
> > precision
> > > > is kind of entertaining. It's however not very productive. I'm
> > > > very clear with my wife that my "hobby" is all about learning for
> > > > me, it's not about trying to improve the garage door opener. Once
> > > > in a
> > while I'll
> > > > make something cool that gets used, but it's not my goal. I may
> > > > join them just to get an education on what I'm clueless about from
> > > > their point of view.
> > > >
> > > > Thanks,
> > > >
> > > > Jeff
> > > >
> > > > On 1/6/2013 1:32 PM, Steve Byan wrote:
> > > > >
> > > > >
> > > > > On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
> >
> > >
> > > >
> > > > > > wrote:
> > > > >
> > > > > > It's called 'volt-nuts'.
> > > > >
> > > > > More fully, the volt-nuts mailing list -- volt-nuts@...
> >
> > >
> > > >
> > > > >
> > > > >
> > > > > To subscribe, go to
> > > > >
> > > > >
> > > > > Best regards,
> > > > > -Steve
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > >
> > > > > > [mailto:hp_agilent_equipment@...
> >
> > >
> > > >
> > > > > ] On Behalf Of Jeff
> > > > > Machesky
> > > > > > Sent: Sunday, January 06, 2013 1:08 PM
> > > > > > To: hp_agilent_equipment@...
> >
> > >
> > > >
> > > > >
> > > > > > Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
> > > > > > low
> > > > > resistance
> > > > > > tips?
> > > > > >
> > > > > >
> > > > > >
> > > > > > Do they have a club for people with a certain number of digits
> > > > > > on their multimeters. I feel they should as it's a
> > > whole new
> > > > > > world.
> > > > >
> > > > > --
> > > > > Steve Byan stevebyan@... >
> > > > > Littleton, MA 01460
> > > > >
> > > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>
>
|
Re: 3457A and other meter low resistance tips?
On Sun, 06 Jan 2013 20:37:07 -0500, you wrote: Joe, you really need to consider moving up to here in Maryland. Preferably next door. :) I moved away from Maryland, many years ago, had to do with no job.... Ended up in Florida.... Move down here.... <grin> Harvey
Best regards,
Tom
----- Original Message -----
From: J. L. Trantham
To: hp_agilent_equipment@...
Sent: Sunday, January 06, 2013 8:27 PM
Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance tips?
You can never have too many meters. It's like your wife's shoes.
However, you need to pick one of the litter to send to whomever for a formal
calibration. I opt for sending them to their respective manufacturers.
That's why I think you should send the 3457A to Agilent. You will get the
'before' and 'after' data that will either give you great confidence in the
meter or shake your faith to the core, until you send it back to Agilent in
a year for another round of 'before' and 'after' data.
I have two HP 3458A's and two Solartron 7081's that have been to their
respective manufacturers (HP and Ametek, twice for the Solartrons) for
calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V,
they are within about 15 uV of each other and quite close to 10.000000 VDC.
Therefore, I conclude that the 731B is 'accurate' and the meters are
calibrated. I don't think I can get any closer than that without building
my own environmental facility and reference. Not likely as a hobby.
However, I now have the 'tools' to do a good calibration of some HP 432A
power meters and their calibrators plus a load of other items.
Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
Joe
-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of Jeff Machesky
Sent: Sunday, January 06, 2013 7:04 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
Too funny. Well I've already got 5 meters of decent quality and I'm looking
for more. It's also sad when I'm building up power supplies to get 1000v DC
and 1000V AC at various frequencies to calibrate items like the DMM on my
2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
Think those little gator clip wires from ebay are safe at 1000v, lol. I've
already managed to kill 1000 piv rated diodes.
I also partake in the crazy practice of joining my fixed 1000v supply with
my 30 volt isolated lab supply to tweak to precise high voltages.
Pretty stupid practice..but someones got to do it. The only saving grace is
the current is at least limited to about 100ma..not that it would save me.
I have the dilemma that if I get a calibrated voltage reference and it
disagrees with the 3457A then I'll naturally have to do one of two things.
Send it off to Agilent to get the meter calibrated, or self calibrate so the
3457A agrees with my reference. The ladder has the advantage of not having a
reference around that disagrees with the meter. If I send it off to Agilent
I'll always question who was right, did the tech do a sloppy job..etc..etc.
Ohh and the ranges also have to exactly agree with each other or it's back
for calibration. Surprisingly they do now.
Insanity is doing the same thing over and over and expecting different
results. Wonder how that plays in with calibration.
Jeff
On 1/6/2013 5:02 PM, Don Black wrote:
>
> he only sure way is to stick your finger in the light socket and guess.
>
> Don Black.
>
> On 07-Jan-13 10:08 AM, Dave Daniel wrote:
> >
> > Unless all three voltmeters disagree. Then he needs n more until at
> > least two agree. Then again, what if more than one pair agree, but
> > with different values? Then I guess he needs a fifth meter which
> > agrees with one of the pairs which agree.
> >
> > As you said, it's addicting and it makes my brain hurt.
> >
> > Dave
> >
> > On 1/6/2013 3:38 PM, J. L. Trantham wrote:
> > >
> > > A man with one voltmeter knows what the voltage is. A man with two
> > > is never quite sure. Therefore he needs a third. :^)
> > >
> > > Careful. This stuff is addicting.
> > >
> > > Joe
> > >
> > > -----Original Message-----
> > > From: hp_agilent_equipment@...
>
> >
> > >
> > > [mailto:hp_agilent_equipment@...
>
> >
> > > ] On Behalf Of Jeff
> > > Machesky
> > > Sent: Sunday, January 06, 2013 2:58 PM
> > > To: hp_agilent_equipment@...
>
> >
> > >
> > > Subject: Re: [hp_agilent_equipment] 3457A and other meter low
> resistance
> > > tips?
> > >
> > > Thanks again for the info.
> > >
> > > Hmm, to join such a group and come in as a total newb might be a
> bit of
> > > a humbling experience. Then again I have to admit I'm enjoying
> > > attempting to get the precision. Even just working with the Hamon
> > > dividers and monitoring temperatures and matching resistors to
> precision
> > > is kind of entertaining. It's however not very productive. I'm
> > > very clear with my wife that my "hobby" is all about learning for
> > > me, it's not about trying to improve the garage door opener. Once
> > > in a
> while I'll
> > > make something cool that gets used, but it's not my goal. I may
> > > join them just to get an education on what I'm clueless about from
> > > their point of view.
> > >
> > > Thanks,
> > >
> > > Jeff
> > >
> > > On 1/6/2013 1:32 PM, Steve Byan wrote:
> > > >
> > > >
> > > > On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
>
> >
> > >
> > > > > wrote:
> > > >
> > > > > It's called 'volt-nuts'.
> > > >
> > > > More fully, the volt-nuts mailing list -- volt-nuts@...
>
> >
> > >
> > > >
> > > >
> > > > To subscribe, go to
> > > >
> > > >
> > > > Best regards,
> > > > -Steve
> > > >
> > > > > -----Original Message-----
> > > > > From: hp_agilent_equipment@...
>
> >
> > >
> > > >
> > > > > [mailto:hp_agilent_equipment@...
>
> >
> > >
> > > > ] On Behalf Of Jeff
> > > > Machesky
> > > > > Sent: Sunday, January 06, 2013 1:08 PM
> > > > > To: hp_agilent_equipment@...
>
> >
> > >
> > > >
> > > > > Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
> > > > > low
> > > > resistance
> > > > > tips?
> > > > >
> > > > >
> > > > >
> > > > > Do they have a club for people with a certain number of digits
> > > > > on their multimeters. I feel they should as it's a
> > whole new
> > > > > world.
> > > >
> > > > --
> > > > Steve Byan stevebyan@... >
> > > > Littleton, MA 01460
> > > >
> > > >
> > >
> > > ------------------------------------
> > >
> > > Yahoo! Groups Links
> > >
> > >
> >
> >
> >
> >
>
>
>
>
------------------------------------
Yahoo! Groups Links
|
Re: 3457A and other meter low resistance tips?
I was going to get a 5 1/2 digit meter. Whoever brought the 3457A to my attention needs a talking to. I'm sitting here watching a cell phone battery self discharge, something is just wrong with that.
Jeff
toggle quoted message
Show quoted text
On 1/6/2013 6:49 PM, J. L. Trantham wrote:
Well, I certainly could use some help. Having an expert next door would be
a good thing.
Joe
From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>] On Behalf Of Tom Miller
Sent: Sunday, January 06, 2013 7:37 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
Joe, you really need to consider moving up to here in Maryland. Preferably
next door. :)
Best regards,
Tom
----- Original Message -----
From: J. L. Trantham
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Sent: Sunday, January 06, 2013 8:27 PM
Subject: RE: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
You can never have too many meters. It's like your wife's shoes.
However, you need to pick one of the litter to send to whomever for a formal
calibration. I opt for sending them to their respective manufacturers.
That's why I think you should send the 3457A to Agilent. You will get the
'before' and 'after' data that will either give you great confidence in the
meter or shake your faith to the core, until you send it back to Agilent in
a year for another round of 'before' and 'after' data.
I have two HP 3458A's and two Solartron 7081's that have been to their
respective manufacturers (HP and Ametek, twice for the Solartrons) for
calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V,
they are within about 15 uV of each other and quite close to 10.000000 VDC.
Therefore, I conclude that the 731B is 'accurate' and the meters are
calibrated. I don't think I can get any closer than that without building
my own environmental facility and reference. Not likely as a hobby.
However, I now have the 'tools' to do a good calibration of some HP 432A
power meters and their calibrators plus a load of other items.
Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
Joe
-----Original Message-----
From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff Machesky
Sent: Sunday, January 06, 2013 7:04 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
Too funny. Well I've already got 5 meters of decent quality and I'm looking
for more. It's also sad when I'm building up power supplies to get 1000v DC
and 1000V AC at various frequencies to calibrate items like the DMM on my
2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
Think those little gator clip wires from ebay are safe at 1000v, lol. I've
already managed to kill 1000 piv rated diodes.
I also partake in the crazy practice of joining my fixed 1000v supply with
my 30 volt isolated lab supply to tweak to precise high voltages.
Pretty stupid practice..but someones got to do it. The only saving grace is
the current is at least limited to about 100ma..not that it would save me.
I have the dilemma that if I get a calibrated voltage reference and it
disagrees with the 3457A then I'll naturally have to do one of two things.
Send it off to Agilent to get the meter calibrated, or self calibrate so the
3457A agrees with my reference. The ladder has the advantage of not having a
reference around that disagrees with the meter. If I send it off to Agilent
I'll always question who was right, did the tech do a sloppy job..etc..etc.
Ohh and the ranges also have to exactly agree with each other or it's back
for calibration. Surprisingly they do now.
Insanity is doing the same thing over and over and expecting different
results. Wonder how that plays in with calibration.
Jeff
On 1/6/2013 5:02 PM, Don Black wrote:
he only sure way is to stick your finger in the light socket and guess.
Don Black.
On 07-Jan-13 10:08 AM, Dave Daniel wrote:
Unless all three voltmeters disagree. Then he needs n more until at
least two agree. Then again, what if more than one pair agree, but
with different values? Then I guess he needs a fifth meter which
agrees with one of the pairs which agree.
As you said, it's addicting and it makes my brain hurt.
Dave
On 1/6/2013 3:38 PM, J. L. Trantham wrote:
A man with one voltmeter knows what the voltage is. A man with two
is never quite sure. Therefore he needs a third. :^)
Careful. This stuff is addicting.
Joe
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 2:58 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
Thanks again for the info.
Hmm, to join such a group and come in as a total newb might be a
bit of
a humbling experience. Then again I have to admit I'm enjoying
attempting to get the precision. Even just working with the Hamon
dividers and monitoring temperatures and matching resistors to
precision
is kind of entertaining. It's however not very productive. I'm
very clear with my wife that my "hobby" is all about learning for
me, it's not about trying to improve the garage door opener. Once
in a
while I'll
make something cool that gets used, but it's not my goal. I may
join them just to get an education on what I'm clueless about from
their point of view.
Thanks,
Jeff
On 1/6/2013 1:32 PM, Steve Byan wrote:
On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
<mailto:jltran%40att.net>
wrote: It's called 'volt-nuts'. More fully, the volt-nuts mailing list -- volt-nuts@...
<mailto:volt-nuts%40febo.com>
To subscribe, go to
Best regards,
-Steve
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 1:08 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
low resistance
tips?
Do they have a club for people with a certain number of digits
on their multimeters. I feel they should as it's a
whole new
world. --
Steve Byan stevebyan@... <mailto:stevebyan%40me.com> >
Littleton, MA 01460
------------------------------------
Yahoo! Groups Links
------------------------------------
Yahoo! Groups Links
|
Re: 3457A and other meter low resistance tips?
Joe, you actually make a good point. Right now the 3457A has my full confidence as it stands. I've not seen a single reading from it that I even slightly question. I had a few misunderstandings, but nothing which was the meters fault. It agrees with all my other meters well within their own spec and it also agrees with many semi precision devices I have floating around. It's absolutely spotless inside and in really good shape outside as well. It was still sealed from the last calibration by Tektronix with no signs of abuse and the cal count was 34. So with that all said I think I'm going to avoid getting any kind of reference at the time and work on getting some more cash together to send it off to Agilent. The before and after can be checked and if I'm confident in the results I can calibrate my lesser meters to match. I then have 5 points of reference to watch for drift issues.
Ohh and most important of all, the 3457A agrees with itself on each range to the limits of noise. That in itself tells me it's at least not aged unevenly. The noise is not much of an issue anymore as well since I learned a few tricks. It's got repeatability which is a very important part.
Thanks,
Jeff
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On 1/6/2013 6:27 PM, J. L. Trantham wrote:
You can never have too many meters. It's like your wife's shoes.
However, you need to pick one of the litter to send to whomever for a formal
calibration. I opt for sending them to their respective manufacturers.
That's why I think you should send the 3457A to Agilent. You will get the
'before' and 'after' data that will either give you great confidence in the
meter or shake your faith to the core, until you send it back to Agilent in
a year for another round of 'before' and 'after' data.
I have two HP 3458A's and two Solartron 7081's that have been to their
respective manufacturers (HP and Ametek, twice for the Solartrons) for
calibration. Reading a Fluke 731B that I obtained from theBay, set to 10 V,
they are within about 15 uV of each other and quite close to 10.000000 VDC.
Therefore, I conclude that the 731B is 'accurate' and the meters are
calibrated. I don't think I can get any closer than that without building
my own environmental facility and reference. Not likely as a hobby.
However, I now have the 'tools' to do a good calibration of some HP 432A
power meters and their calibrators plus a load of other items.
Enjoy!!!!!! And I hope you get to see your family from time to time. :^)
Joe
-----Original Message-----
From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>] On Behalf Of Jeff Machesky
Sent: Sunday, January 06, 2013 7:04 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance
tips?
Too funny. Well I've already got 5 meters of decent quality and I'm looking
for more. It's also sad when I'm building up power supplies to get 1000v DC
and 1000V AC at various frequencies to calibrate items like the DMM on my
2465BDM. I don't need 1000, buy hey I figured I may as well have overhead.
Think those little gator clip wires from ebay are safe at 1000v, lol. I've
already managed to kill 1000 piv rated diodes.
I also partake in the crazy practice of joining my fixed 1000v supply with
my 30 volt isolated lab supply to tweak to precise high voltages.
Pretty stupid practice..but someones got to do it. The only saving grace is
the current is at least limited to about 100ma..not that it would save me.
I have the dilemma that if I get a calibrated voltage reference and it
disagrees with the 3457A then I'll naturally have to do one of two things.
Send it off to Agilent to get the meter calibrated, or self calibrate so the
3457A agrees with my reference. The ladder has the advantage of not having a
reference around that disagrees with the meter. If I send it off to Agilent
I'll always question who was right, did the tech do a sloppy job..etc..etc.
Ohh and the ranges also have to exactly agree with each other or it's back
for calibration. Surprisingly they do now.
Insanity is doing the same thing over and over and expecting different
results. Wonder how that plays in with calibration.
Jeff
On 1/6/2013 5:02 PM, Don Black wrote:
he only sure way is to stick your finger in the light socket and guess.
Don Black.
On 07-Jan-13 10:08 AM, Dave Daniel wrote:
Unless all three voltmeters disagree. Then he needs n more until at
least two agree. Then again, what if more than one pair agree, but
with different values? Then I guess he needs a fifth meter which
agrees with one of the pairs which agree.
As you said, it's addicting and it makes my brain hurt.
Dave
On 1/6/2013 3:38 PM, J. L. Trantham wrote:
A man with one voltmeter knows what the voltage is. A man with two
is never quite sure. Therefore he needs a third. :^)
Careful. This stuff is addicting.
Joe
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 2:58 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] 3457A and other meter low
resistance
tips?
Thanks again for the info.
Hmm, to join such a group and come in as a total newb might be a
bit of
a humbling experience. Then again I have to admit I'm enjoying
attempting to get the precision. Even just working with the Hamon
dividers and monitoring temperatures and matching resistors to
precision
is kind of entertaining. It's however not very productive. I'm
very clear with my wife that my "hobby" is all about learning for
me, it's not about trying to improve the garage door opener. Once
in a
while I'll
make something cool that gets used, but it's not my goal. I may
join them just to get an education on what I'm clueless about from
their point of view.
Thanks,
Jeff
On 1/6/2013 1:32 PM, Steve Byan wrote:
On Jan 6, 2013, at 3:07 PM, J. L. Trantham jltran@...
<mailto:jltran%40att.net>
wrote: It's called 'volt-nuts'. More fully, the volt-nuts mailing list -- volt-nuts@...
<mailto:volt-nuts%40febo.com>
To subscribe, go to
Best regards,
-Steve
-----Original Message-----
From: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of Jeff
Machesky
Sent: Sunday, January 06, 2013 1:08 PM
To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: Re: [hp_agilent_equipment] Re: 3457A and other meter
low resistance
tips?
Do they have a club for people with a certain number of digits
on their multimeters. I feel they should as it's a
whole new
world. --
Steve Byan stevebyan@... <mailto:stevebyan%40me.com> >
Littleton, MA 01460
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