Re: 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
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----- 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
|
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.
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----- 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)
------------------------------------
Yahoo! Groups Links
|
Re: 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
toggle quoted message
Show quoted text
-----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%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?
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
toggle quoted message
Show quoted text
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
|
Re: 3457A and other meter low resistance tips?
he only sure way is to stick your finger in the light socket and guess.
Don Black.
toggle quoted message
Show quoted text
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
|
Re: 3457A and other meter low resistance tips?
But that's when you need standards, not voltmeters. :^)
Joe
toggle quoted message
Show quoted text
-----Original Message----- From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Dave Daniel Sent: Sunday, January 06, 2013 5:08 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 3457A and other meter low resistance tips? 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
|
Re: 3457A and other meter low resistance tips?
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
toggle quoted message
Show quoted text
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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Yahoo! Groups Links
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Re: 3457A and other meter low resistance tips?
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
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-----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@...
<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
|
Re: 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
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Show quoted text
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
|
Re: 3457A and other meter low resistance tips?
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
|
Re: 3457A and other meter low resistance tips?
It's called 'volt-nuts'.
Joe
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-----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.
|
Re: HP 11660A Shunt for HP 8556A
This does make a slight difference in the readings in case any one else is interested in the results.
Thanks again to all that help resolve this issue.
Steve, KJ5RV
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--- In hp_agilent_equipment@..., Steve Vineyard wrote:
That is interesting and it would now make sense why they did not use the
50 ohm pass thru, but created a unit specific shunt.
I will have to change mine to that value and see if it makes any
difference to my test results.
Thank you Martin for your effort and thank you Steve (AZUR Electronics)
for your courtesy of unveiling the secret.
Steve, KJ5RV
martin_u_fischer wrote:
Hello Steve,
today I got a PM from Steve [AZUR Electronics];
he shows a "HP 11660A Tracking Generator Shunt (home made version)" on
his website
and by courtesy he unveiled the secret around the component values of
the 11660A.
He figures out that the 11660A contains a single shunt resistor of
54.5 Ohms.
Albeit this will constitute a gross mismatch for the 600 ohms output
resistance of the TG,
it will transform the effective source resistance into exactly 50 ohms.
³Õ´Ç¾±±ô¨¤!
Regards
Martin
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Re: 3457A and other meter low resistance tips?
Thanks for the link. I signed up and got the full PDF version, lots of great info within. 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. I made the mistake of connecting a 5k thermistor to the meter and placing it in temperature mode. 70.42135F sounds great until you realize anything past that tenth place moves around a whole lot. If you so much as breath in the direction of the thermistor it goes sailing off. Crazy stuff.
Based on other tests I've done such as resistance measurements with volts and amps and a calculator it appears the meter is as close as I could ever want it to be. My 0.001 ohm resistor should have been 0.00101 ohms based on other higher current tests and the 3457A reads ~0.00102 after subtracting the Kelvin tip offsets. I work a lot with power supply designs, so I often need to measure current sense shunts. I'll stick with my tried and true 1 amp method to get the precise readings I'm looking for. I can get down in the nano ohms with that technique and this new meter. The self heating is actually desirable in this case for real world applications. Then again it's all overkill and easier to compensate for in software.
I'm going to build up a precision current source for use with the Kelvin probes and the meter for those crazy low resistances. I've found that successive approximation can get you very accurate in a home based lab. Enough samples and you can narrow down the accuracy over time.
Thanks,
Jeff
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On 1/6/2013 8:22 AM, marvgozum wrote:
Congratulations! Peruse the tips here, the document is free:
There are various phenomena that show their heads on either extreme of resistance you're measuring.
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Re: Frequency / Function Generator for the Hamshack
HP 8165a. Not sure it'd work with the SA, though. I drive mine with GPIB. Usually can be had cheaply. Norm On Sun, Jan 6, 2013 at 12:36 PM, W8KZW <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
[Non-text portions of this message have been removed]
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Frequency / Function Generator for the Hamshack
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
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Hi Joe, ... I have been reluctant to open this particular instrument due to
concerns about my 'skills' at this level. However, I'm gaining
confidence and getting closer to the required 'courage' to open it
up. Don't worry about that!. If I have been able to (almost, except CRT) fix mine, everyone could do it :-)! It is a matter of apllying logic and use the available tools. I don't have a TAM and you can do also without it. In fact, I think you learn more if you don't have it :-). And, for me at least, it is a matter of learning new things. Then, if the result (i.e. the fixed equipment) is useful for my work, still better! I plan to develop a WEB page on my site for the 8562A repair. I have been re-checking my notes and pictures and I think it may help some others with similar troubles. I will keep you posted when I upload it. Regards, JOSE -- 73 EB5AGV - JOSE V. GAVILA - IM99sm La Canyada - Valencia(SPAIN) AGVradio Personal WEB
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Re: HP 11660A Shunt for HP 8556A
That is interesting and it would now make sense why they did not use the 50 ohm pass thru, but created a unit specific shunt.
I will have to change mine to that value and see if it makes any difference to my test results.
Thank you Martin for your effort and thank you Steve (AZUR Electronics) for your courtesy of unveiling the secret.
Steve, KJ5RV
martin_u_fischer wrote:
toggle quoted message
Show quoted text
Hello Steve,
today I got a PM from Steve [AZUR Electronics];
he shows a "HP 11660A Tracking Generator Shunt (home made version)" on his website
and by courtesy he unveiled the secret around the component values of the 11660A.
He figures out that the 11660A contains a single shunt resistor of 54.5 Ohms.
Albeit this will constitute a gross mismatch for the 600 ohms output resistance of the TG,
it will transform the effective source resistance into exactly 50 ohms.
Voil???!
Regards
Martin
|
Re: 3457A and other meter low resistance tips?
Congratulations! Peruse the tips here, the document is free:
There are various phenomena that show their heads on either extreme of resistance you're measuring.
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Re: Choosing a quiet replacement fan
I'm not sure what point silentpcfan were trying to make: the advice is so vague that you can't make any practical use of it. For any "box" of electronics which incorpoates a fan, there is the simple electrical power-in = heat power out balance, and if you make the pessimistic assumption that no heat escapes from the case (by convection), you can calculate the air-flow required for a given air temperature rise (T airin v Tairout) knowing the thermal capacity of air [=circa 33 joules/cu ft/deg C]. They may be tangentially hinting at the characteristics of finned heatsinks when force-air cooled. As the air velocity rises, there is a gradual increase in the temperature drop along the fin (i.e from root to tip at rt angles to the air-flow). I recall this parameter being quantified as "fin efficiency": if the tip is cooled to aroud that of the airstream, it becomes relatively ineffective and the fin should either be thicker or shorter (or both). John --- In hp_agilent_equipment@..., Dave C wrote:
I read occasionally that owners of T&M equipment tire of the noise a
cooling fan makes and asks for help to determine if/how a quieter replacement can be found. There are many factors at play in such a decision, none as simple as "it's quieter".
This web site addresses choosing a fan for PC enclosures, and many of
the criteria are the same (heat being the most important one for us):
A quote:
"Over the years, we have observed one clear phenomenon about fans and
cooling: The relationship between airflow and temperature invariably becomes exponential at some point. Increase airflow from nothing to something, and the drop in temperature can be dramatic. Keep increasing airflow, and the cooling improvement becomes less and less significant, until at some point, the temperature hardly drops at all. The trick, for the PC builder who seeks both good cooling and low noise, is to find the point where any decrease in airflow (or fan speed) effects a significant increase in temperature, while only a very large airflow increase effects a significant temperature drop. In other words, once you have enough airflow, additional airflow has very little cooling effect, so all you're doing is increasing noise. "Enough airflow" is not a constant, of course, it varies for each system of components."
FYI,
Dave
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John Sykes