Re: Seeking Spring Nuts for Series 1 cabinet
Greetings,
How about McMaster Carr or Fastenal?
Worth a shot.
Good hunting!
Ken
toggle quoted message
Show quoted text
The top and bottom covers of the 740B are secured by screws which go through 6-32 J-style?spring nuts clipped onto the side panels. ?Except I'm missing some of them. ?The manual doesn't mention them.
These particular?spring?nuts (speed?nuts, clip nuts, Tinnerman nuts, J-nuts, U-nuts)?seem to be obsolete or custom-made; I can't find anything to match.
The sticking point is the?1/8-inch panel depth.
All I can find?are for a 1/16-inch?panel.
Got any leads?
Thanks,
Dave Wise
PS: I think U-style would work as well as J-style.
|
Seeking Spring Nuts for Series 1 cabinet
The top and bottom covers of the 740B are secured by screws which go through 6-32 J-style?spring nuts clipped onto the side panels. ?Except I'm missing some of them. ?The manual doesn't mention them.
These particular?spring nuts (speed?nuts, clip nuts, Tinnerman nuts, J-nuts, U-nuts)?seem to be obsolete or custom-made; I can't
find anything to match.
The sticking point is the?1/8-inch panel depth.
All I can find?are for a 1/16-inch?panel.
Got any leads?
Thanks,
Dave Wise
PS: I think U-style would work as well as J-style.
|
Re: Problem with HP MMS 70000, USERLOCK ON
Hi JF,
I could USERLOCK OFF with my HP computer using your method.
I've tried to load again the 70875A DLP loaded into my 70900B and
faced out to the same USERLOCK ON !
I guess the program is corrupted (ERR2001), tomorrow I'll try to
reload it with my original personality module.
May be due to the 70900B battery which could be out of gas .
Will see.
Thanks again
Pierre-Fran?ois, F5BQP
?
Le 21/04/2020 à 13:37, jfphp via
groups.io a écrit?:
toggle quoted message
Show quoted text
Programing manual 70900-90284 p. 2.550
Check HPIB address of the 70900A/B !
On Tuesday, April 21, 2020, 11:11:02 AM GMT+2,
Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...>
wrote:
Hi Paul,
I would like to reset my analyser as I'm into a
deadlock within the DLP sequence and I cannot do
anything to exit.
Even the Preset Instrument button (green button) shows
me the message USERLOCK ON when I press it.
pf
Le 21/04/2020
à 10:56, Paul Bicknell a écrit?:
Hi Pierre-Fran?ois
?
Are you
actually going to send commands to the? analyser
if so why
?
I can see
the need to do screen dumps to a computer? also?
dater streams of the displayed information
?
Paul
?
Ok
fine JF, but how to proceed when you have
connected a computer to the HPIB ??
How to send the command ?
73's
pf
Le 20/04/2020 à 23:19, jfphp via
groups.io a écrit?:
On Monday, April 20, 2020, 08:55:34
PM GMT+2, Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...>
wrote:
Hello,
After a long period of non use of my MMS
70k I decided to use it again to measure
some NF with the 70875A DLP software.
A new calibration of the spectrum was
done OK.
I loaded the 70875A DLP software and
after some manipulation I realized I
could not use anymore the software.
Don't know what I did but impossible to
return to the spectrum functionalities.
When I try to preset the instrument
(green button) or the Menu function I
got USERLOCK ON and impossible anymore
to use the instrument.
How to go to the USERLOCK OFF back again
and/or to reset the instrument?
I'm really stucked on this situation
with the impossibility to use it again.
Thanks for your help.
--
Pierre-Fran?ois, F5BQP
JN18AN
?
No virus found in
this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 -
Release Date: 08/14/18
Internal Virus Database is out of date.
--
Pierre-Fran?ois, F5BQP
JN18AN
--
Pierre-Fran?ois, F5BQP
JN18AN
--
Pierre-Fran?ois, F5BQP
JN18AN
|
HP8562A Errors 304,335,317,333
Stu:
>There is no physical connectivity to the Diodes CR301/302? >only the decoupling cap C301(Suggested being faulty).
C301 is not a decoupling capacitor.
It connects 50/60 Hz AC from the secondary winding to rectifiers CR301/302.
>Is this a voltage doubling circuit , not sure?
Yes. ----------
Best regards,
Goran Finnberg
The Mastering Room AB
Goteborg
Sweden
E-mail: mastering@...
Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther
(\__/)
(='.'=)
(")_(") Aron, VovVov, Nero & Smurfen:RIP
|
Re: HP 400x AC voltmeter low-noise mods - was: new File called App notes
On 4/20/20 9:24 PM, Bill Perkins wrote: ?The BNC retrofit is a complete no brainer, complicated only by the need for a ground-isolated BNC readily available from Kings Another way to get to coax from banana jacks is to use the rare GR shrouded shielded double banana connector/cables -- if you can get them... They were supplied with some bridges for detector and generator connections. Searching for those words yields nothing today...
|
Re: HP8562A Errors 304,335,317,333
hello i think it is to galvanize isolate that supply. But it is exact the cap. I bet it is open. just use a 220uf i do that all the time to bring it back.
let me know once you tried
best regards Peter
Peter,
?
Have a 2nd PSU to remove and use as Test components.
One quick question?
?
What type of PSU is this never seen this type of config before!
?
?
?
There is no physical connectivity to the Diodes CR301/302 only the decoupling cap C301(Suggested being faulty).
Is this a voltage doubling circuit , not sure?
?
Cheers,
Stu.
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Peter Hansen
Sent: 17 April 2020 21:35
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP8562A Errors 304,335,317,333
?
Hello It can work stand alone. I have had failures in the PSU in a 180uF capacitor. It was a blue one. It was open and leaked alittle. If you need i Can find a psu and point to it. The cap was open and the 28v was
absent.
PSU is taken out from the top side all 4 pcb must be folded out and below the alu cover is the PSU.
Would Like to say Good news but?
?
Managed to get the Analyser on the bench today for a quick check and looks as if 28Volts not there.
?
Also getting that smell of Burning rubber so worried could be causing more damage and need to isolate the source and start diagnosing supply.
?
Can the PSU work standalone, or is it load conscious?
?
Stu.
?
?
?
?
?
hello Stu if you look on A2 on the side you see the LEDs for the PSU. All should be LIT. I am sure this is not a PSU issue.
If you work through the 300/600Mhz chain with an osilloscope you can check where the signal dissapears. I remember the 600Mhz is made in a doubler and if signal is too small you have not enough for doubling to 600Mhz.
Peter,
?
Ok from schematic I can see the 600MHz Oscillator
à Buffer à /2 = 300Mhz
à Offset Loop Buffer. Is that correct?
Is it the /2 device your talking about? The whole board seems to be a 600Mhz PLL with 10Mhz ref at source.
Correct me if I’m wrong.
?
I still think something burn’t out although th PSU looks clean.
Just prepping up before getting My hands dirty..
?
Stu.
?
?
Hello Stu I must correct my self. The 8562A is before use og MMIC. area is still the same. It is just discrete amplifiers. Order a schematics from Artic media ant look for Radio Frequency module look in the page with
the generation of 300/600Mhz.
Reason why you can?t measure anything is because the 600Mhz is used for third mixer.
Peter,
?
Which board are we talking about ?
Still looking for the LED PSU indicators on the A2 card.
?
Presume you are referring RF board..?
Is this an off the shelf part or HP proprietary?
?
Thanks,
?
Stu.
?
?
Hello Group a TAM is not needed in this case. It is simply a MMIC in the 300/600Mhz chain that is bad.
I believe Harke has a Hp85629A TAM for sale.
best regards Peter Hansen
I suspect you might be able to rent the TAM from one of the ETE rental outfits for a month or so for not a horrible price.? I believe that Tam Hanna has one or two for sale, I may purchase one from him for my own use with my 8562A.
Don Bitters
|
Re: HP8562A Errors 304,335,317,333
Peter, ? Have a 2nd PSU to remove and use as Test components. One quick question? ? What type of PSU is this never seen this type of config before! ? 
? ? There is no physical connectivity to the Diodes CR301/302 only the decoupling cap C301(Suggested being faulty). Is this a voltage doubling circuit , not sure? ? Cheers, Stu. ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Peter Hansen
Sent: 17 April 2020 21:35
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP8562A Errors 304,335,317,333? Hello It can work stand alone. I have had failures in the PSU in a 180uF capacitor. It was a blue one. It was open and leaked alittle. If you need i Can find a psu and point to it. The cap was open and the 28v was absent. PSU is taken out from the top side all 4 pcb must be folded out and below the alu cover is the PSU.
Would Like to say Good news but? ? Managed to get the Analyser on the bench today for a quick check and looks as if 28Volts not there. ? Also getting that smell of Burning rubber so worried could be causing more damage and need to isolate the source and start diagnosing supply. ? Can the PSU work standalone, or is it load conscious? ? Stu. ? ? ? ? ? hello Stu if you look on A2 on the side you see the LEDs for the PSU. All should be LIT. I am sure this is not a PSU issue. If you work through the 300/600Mhz chain with an osilloscope you can check where the signal dissapears. I remember the 600Mhz is made in a doubler and if signal is too small you have not enough for doubling to 600Mhz.
Peter, ? Ok from schematic I can see the 600MHz Oscillator à Buffer à /2 = 300Mhz à Offset Loop Buffer. Is that correct? Is it the /2 device your talking about? The whole board seems to be a 600Mhz PLL with 10Mhz ref at source. Correct me if I’m wrong. ? I still think something burn’t out although th PSU looks clean. Just prepping up before getting My hands dirty.. ? Stu. ? ? Hello Stu I must correct my self. The 8562A is before use og MMIC. area is still the same. It is just discrete amplifiers. Order a schematics from Artic media ant look for Radio Frequency module look in the page with the generation of 300/600Mhz. Reason why you can?t measure anything is because the 600Mhz is used for third mixer.
Peter, ? Which board are we talking about ? Still looking for the LED PSU indicators on the A2 card. ? Presume you are referring RF board..? Is this an off the shelf part or HP proprietary? ? Thanks, ? Stu. ? ? Hello Group a TAM is not needed in this case. It is simply a MMIC in the 300/600Mhz chain that is bad. I believe Harke has a Hp85629A TAM for sale. best regards Peter Hansen
I suspect you might be able to rent the TAM from one of the ETE rental outfits for a month or so for not a horrible price.? I believe that Tam Hanna has one or two for sale, I may purchase one from him for my own use with my 8562A.
Don Bitters
|
HP400E was new File called App notes
Jim Ford:
>I was assuming 600 ohms for audio.? Sorry no.
600 ohm for Pro-Audio has been dead for at least 50 years.
It is usually <50 ohm out and 10 kohm bridging input.
The HP400E is 10 meg ohm input impedance.
----------
Best regards,
Goran Finnberg
The Mastering Room AB
Goteborg
Sweden
E-mail: mastering@...
Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther
(\__/)
(='.'=)
(")_(") Aron, VovVov, Nero & Smurfen:RIP
|
HP400E was new File called App notes
Jim Ford: >On the most sensitive range, -60 dB 0.001 V, the needle moves around a fair amount with open input BNC, and if that could be
stopped, that would be great. If you put a 50 ohm BNC load at the input what happens ? With 10 Meg Ohms input impedance I would think that it would pick up anything within sight. ------------ Best regards, Goran Finnberg The Mastering Room AB Goteborg Sweden E-mail: mastering@... Learn from the mistakes of others, you can never live long enough to make them all yourself.??? -?? John Luther (\__/) (='.'=) (")_(") Aron, VovVov, Nero & Smurfen:RIP
|
Re: Problem with HP MMS 70000, USERLOCK ON
Thank you JF, will keep you informed .
73's
pf
Le 21/04/2020 à 13:37, jfphp via
groups.io a écrit?:
toggle quoted message
Show quoted text
Programing manual 70900-90284 p. 2.550
Check HPIB address of the 70900A/B !
On Tuesday, April 21, 2020, 11:11:02 AM GMT+2,
Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...>
wrote:
Hi Paul,
I would like to reset my analyser as I'm into a
deadlock within the DLP sequence and I cannot do
anything to exit.
Even the Preset Instrument button (green button) shows
me the message USERLOCK ON when I press it.
pf
Le 21/04/2020
à 10:56, Paul Bicknell a écrit?:
Hi Pierre-Fran?ois
?
Are you
actually going to send commands to the? analyser
if so why
?
I can see
the need to do screen dumps to a computer? also?
dater streams of the displayed information
?
Paul
?
Ok
fine JF, but how to proceed when you have
connected a computer to the HPIB ??
How to send the command ?
73's
pf
Le 20/04/2020 à 23:19, jfphp via
groups.io a écrit?:
On Monday, April 20, 2020, 08:55:34
PM GMT+2, Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...>
wrote:
Hello,
After a long period of non use of my MMS
70k I decided to use it again to measure
some NF with the 70875A DLP software.
A new calibration of the spectrum was
done OK.
I loaded the 70875A DLP software and
after some manipulation I realized I
could not use anymore the software.
Don't know what I did but impossible to
return to the spectrum functionalities.
When I try to preset the instrument
(green button) or the Menu function I
got USERLOCK ON and impossible anymore
to use the instrument.
How to go to the USERLOCK OFF back again
and/or to reset the instrument?
I'm really stucked on this situation
with the impossibility to use it again.
Thanks for your help.
--
Pierre-Fran?ois, F5BQP
JN18AN
?
No virus found in
this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 -
Release Date: 08/14/18
Internal Virus Database is out of date.
--
Pierre-Fran?ois, F5BQP
JN18AN
--
Pierre-Fran?ois, F5BQP
JN18AN
--
Pierre-Fran?ois, F5BQP
JN18AN
|
Re: Problem with HP MMS 70000, USERLOCK ON
Programing manual 70900-90284 p. 2.550
Check HPIB address of the 70900A/B !
On Tuesday, April 21, 2020, 11:11:02 AM GMT+2, Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...> wrote:
Hi Paul,
I would like to reset my analyser as I'm into a deadlock within the DLP sequence and I cannot do anything to exit.
Even the Preset Instrument button (green button) shows me the message USERLOCK ON when I press it.
pf
Le 21/04/2020 à 10:56, Paul Bicknell a écrit?:
Hi Pierre-Fran?ois ? Are you actually going to send commands to the? analyser if so why ? I can see the need to do screen dumps to a computer? also? dater streams of the displayed information ? Paul
From: [email protected] [mailto:[email protected] ] On Behalf Of Pierre-Fran?ois (f5bqp_pfm)
Sent: 21 April 2020 06:17
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Problem with HP MMS 70000, USERLOCK ON ? Ok fine JF, but how to proceed when you have connected a computer to the HPIB ??
How to send the command ?
73's
pf
Le 20/04/2020 à 23:19, jfphp via groups.io a écrit?: On Monday, April 20, 2020, 08:55:34 PM GMT+2, Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...> wrote: Hello,
After a long period of non use of my MMS 70k I decided to use it again to measure some NF with the 70875A DLP software.
A new calibration of the spectrum was done OK.
I loaded the 70875A DLP software and after some manipulation I realized I could not use anymore the software.
Don't know what I did but impossible to return to the spectrum functionalities.
When I try to preset the instrument (green button) or the Menu function I got USERLOCK ON and impossible anymore to use the instrument.
How to go to the USERLOCK OFF back again and/or to reset the instrument?
I'm really stucked on this situation with the impossibility to use it again.
Thanks for your help.
--
Pierre-Fran?ois, F5BQP
JN18AN ? No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date. -- Pierre-Fran?ois, F5BQP JN18AN
--
Pierre-Fran?ois, F5BQP
JN18AN
|
Re: Problem with HP MMS 70000, USERLOCK ON
Hi Paul,
I would like to reset my analyser as I'm into a deadlock within
the DLP sequence and I cannot do anything to exit.
Even the Preset Instrument button (green button) shows me the
message USERLOCK ON when I press it.
pf
Le 21/04/2020 à 10:56, Paul Bicknell a
écrit?:
Hi Pierre-Fran?ois
?
Are you
actually going to send commands to
the? analyser if so why
?
I can see the
need to do screen dumps to a
computer? also? dater streams of the displayed
information
?
Paul
?
Ok fine
JF, but how to proceed when
you have connected a computer to the HPIB ??
How to send the command ?
73's
pf
Le 20/04/2020 à 23:19, jfphp via
groups.io a écrit?:
On
Monday, April 20, 2020, 08:55:34 PM
GMT+2, Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...>
wrote:
Hello,
After a long period of non use of my MMS
70k I decided to use it again to measure
some NF with the 70875A DLP software.
A new calibration of the spectrum was
done OK.
I loaded the 70875A DLP software and
after some manipulation I realized I
could
not use anymore the software.
Don't know what I did but impossible to
return to the spectrum functionalities.
When I try to preset the instrument
(green button) or the Menu function I
got USERLOCK ON
and impossible anymore to use the
instrument.
How to go to the USERLOCK OFF back again
and/or to reset the instrument?
I'm really stucked on this situation
with the impossibility to use it again.
Thanks for your help.
--
Pierre-Fran?ois, F5BQP
JN18AN
?
No
virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 -
Release Date: 08/14/18
Internal Virus Database is out of date.
--
Pierre-Fran?ois, F5BQP
JN18AN
-- Pierre-Fran?ois, F5BQP JN18AN
|
HP K21-5321B Digital Clock
Hello,
maybe anybody has a service Manual für
the K21-5321B Digital Clock.
My clock dosent work the right way. I
already tryed swaping ICs but i think that more than one
is faulty...
Best regards from Germany
Philipp Gr?mer
|
Re: Problem with HP MMS 70000, USERLOCK ON
Hi Pierre-Fran?ois
?
Are you actually going to send commands to
the? analyser if so why
?
I can see the need to do screen dumps to a
computer? also? dater streams of the displayed information
?
Paul
?
Ok fine JF, but how to proceed when
you have connected a computer to the HPIB ??
How to send the command ?
73's
pf
toggle quoted message
Show quoted text
Le 20/04/2020 à 23:19, jfphp via groups.io a écrit?:
On Monday, April 20, 2020, 08:55:34 PM
GMT+2, Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...>
wrote:
Hello,
After a long period of non use of my MMS 70k I decided to use it again to measure
some NF with the 70875A DLP software.
A new calibration of the spectrum was done OK.
I loaded the 70875A DLP software and after some manipulation I realized I could
not use anymore the software.
Don't know what I did but impossible to return to the spectrum functionalities.
When I try to preset the instrument (green button) or the Menu function I got USERLOCK ON
and impossible anymore to use the instrument.
How to go to the USERLOCK OFF back again and/or to reset the instrument?
I'm really stucked on this situation with the impossibility to use it again.
Thanks for your help.
--
Pierre-Fran?ois, F5BQP
JN18AN
?
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
-- Pierre-Fran?ois, F5BQP JN18AN
|
Re: HP8920B Power supply capacitors??
On Sun, Oct 13, 2019 at 08:20 PM, RFI-EMI-GUY wrote:
C7 113F - a Rifa capacitor .047 630V
J5? 105F - CORCOM input filter. This seems to heat quickly.
The Rifa X and Y capacitors from the 80s are replace on sight items - can use new Rifa or other brands as long as they fit, there is not much space in there. The IEC mains input filter would be on my list, again looks very tight in there and finding a replacement (new not NOS) that fits would be tricky. When these these blow the result is not pretty. Regards, John
|
This is an excellent book on the culture of the company when Bill and Dave ran it.
|
Re: Problem with HP MMS 70000, USERLOCK ON
Ok fine JF, but how to proceed when you have
connected a computer to the HPIB ??
How to send the command ?
73's
pf
Le 20/04/2020 à 23:19, jfphp via
groups.io a écrit?:
toggle quoted message
Show quoted text
USERLOCK OFF par HPIB.
On Monday, April 20, 2020, 08:55:34 PM GMT+2,
Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...>
wrote:
Hello,
After a long period of non use of my MMS 70k I decided to
use it again to measure some NF with the 70875A DLP
software.
A new calibration of the spectrum was done OK.
I loaded the 70875A DLP software and after some
manipulation I realized I could not use anymore the
software.
Don't know what I did but impossible to return to the
spectrum functionalities.
When I try to preset the instrument (green button) or the
Menu function I got USERLOCK ON and impossible anymore to
use the instrument.
How to go to the USERLOCK OFF back again and/or to reset
the instrument?
I'm really stucked on this situation with the
impossibility to use it again.
Thanks for your help.
--
Pierre-Fran?ois, F5BQP
JN18AN
--
Pierre-Fran?ois, F5BQP
JN18AN
|
Re: new File called App notes
Hmmm, you’re right, I missed that about the F/FL: only 4 MHz. Sorry!
On Mon, Apr 20, 2020 at 9:23 PM Bill Perkins < sales@...> wrote: ? ? ? ? I just looked at the Op-Servs and as I remembered the E & EL are 10MHz
and do 1mV FSD whereas the F & FL are 4MHz and do 100uV FSD.
? ? ? ? Both have a switchable 100KHz low pass, neither is much good about 15dB
below its FSD on the lowest ranges and while both are RMS -reading- both
are average -responding-
? ? ? ? You have to get into the 3400A/B series to have true RMS and although
much quieter they do only 1mV FSD. The 'A' is good to 10MHz while the
'B' is good to 20.
? ? ? ? Bill
> All HP-400 AC voltmeters have 10 Megohms input impedance: the
> solid-state E/EL, F/FL, and GL, and the older hollow-state D, H, and L,
> plus rack versions of the latter three. The solid-state voltmeters have
> a range of 10 Hz to 10 MHz while the vacuum tube versions are limited to
> 4 MHz. As usual for HP, the frequency range is conservative. [From the
> 1970 HP catalog.]
>
> Jeremy
>
|
Re: new File called App notes
I just looked at the Op-Servs and as I remembered the E & EL are 10MHz and do 1mV FSD whereas the F & FL are 4MHz and do 100uV FSD.
Both have a switchable 100KHz low pass, neither is much good about 15dB below its FSD on the lowest ranges and while both are RMS -reading- both are average -responding-
You have to get into the 3400A/B series to have true RMS and although much quieter they do only 1mV FSD. The 'A' is good to 10MHz while the 'B' is good to 20.
Bill
toggle quoted message
Show quoted text
All HP-400 AC voltmeters have 10 Megohms input impedance: the solid-state E/EL, F/FL, and GL, and the older hollow-state D, H, and L, plus rack versions of the latter three. The solid-state voltmeters have a range of 10 Hz to 10 MHz while the vacuum tube versions are limited to 4 MHz. As usual for HP, the frequency range is conservative. [From the 1970 HP catalog.]
Jeremy
|
Re: new File called App notes
I was assuming 600 ohms for audio.?
Jim
Sent from my Verizon, Samsung Galaxy smartphone
toggle quoted message
Show quoted text
-------- Original message -------- From: Jeremy Nichols <jn6wfo@...> Date: 4/20/20 8:58 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] new File called App notes
All HP-400 AC voltmeters have 10 Megohms input impedance: the solid-state E/EL, F/FL, and GL, and the older hollow-state D, H, and L, plus rack versions of the latter three. The solid-state voltmeters have a range of 10 Hz to 10 MHz while the vacuum tube versions are limited to 4 MHz. As usual for HP, the frequency range is conservative. [From the 1970 HP catalog.]
Jeremy?
Sposed to be 600 ohms, I think.? Yep, the needle moves with nothing
connected.? I bought this thing at the TRW swap meet back in 1992 or
1993.? I haven't used it much, but it did help me verify my own hearing
JNDs (Just Noticeable Differences) of 1-2 dB, the same with sinewave,
audio (music), and white noise.
Will check Zin shortly.
Jim
------ Original Message ------
From: "Dave McGuire" <mcguire@...>
To: [email protected]
Sent: 4/20/2020 8:40:39 PM
Subject: Re: [HP-Agilent-Keysight-equipment] new File called App notes
>On 4/20/20 11:38 PM, Jim Ford wrote:
>>? Me, too.? I have a 400E and just checked it after not having used it for
>>? some time.? On the most sensitive range, -60 dB 0.001 V, the needle
>>? moves around a fair amount with open input BNC, and if that could be
>>? stopped, that would be great.
>>
>>? Or is there something else wrong with mine?
>
>? ?With nothing connected?
>
>? ?Whats the input impedance of the 400E?
>
>? ? ? ? ? ? ?-Dave
>
>--
>Dave McGuire, AK4HZ
>New Kensington, PA
>
>
>
-- Jeremy Nichols
6.
|
Pierre-Fran?ois (f5bqp_pfm)
Paul Bicknell
Jeremy Nichols
Liam Perkins