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Re: HP 14570A AC Power Switch

 

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Am 21.02.2022 um 08:24 schrieb Joel Setton:

Hello,

Has anyone heard about the HP 14570A ? This is not a well-known product, it is an AC Power Switch, made by the New Jersey Division (formerly Harrison Labs), and described with some detail in the December 1982 issue of HP Journal.
Would anyone have a manual or schematics for the 14570A ? I have not been able to locate it on the Web.

Thanks,

Joel Setton

Re: WTD: Filter capacitors for 8662A PSU

 

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Hello Why cange them. Are they tested bad or just want to change them ?
best regards Peter

Fra: [email protected] <[email protected]> p? vegne af Bob Weiss <bobweiss1967@...>
Sendt: 20. februar 2022 23:45
Til: [email protected] <[email protected]>
Emne: [HP-Agilent-Keysight-equipment] WTD: Filter capacitors for 8662A PSU
?
Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.

The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835

I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.

Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?

73,
Bob Weiss N2IXK

HP 14570A AC Power Switch

 

Hello,

Has anyone heard about the HP 14570A ? This is not a well-known product, it is an AC Power Switch, made by the New Jersey Division (formerly Harrison Labs), and described with some detail in the December 1982 issue of HP Journal.
Would anyone have a manual or schematics for the 14570A ? I have not been able to locate it on the Web.

Thanks,

Joel Setton
HP 9100-1742 Transformer

 

Anyone know what scope this transformer was used on?
Re: HP-8753E Options Activated

 

Hi Marcus:

I am not sure that is entirely true yet. While I am pleased with the result, I worry that when I disabled OPT11, but then used 01 01 01 at address 0x00 - 02, which enabled OPT 10 only, may have had an effect I cannot verify. Nonetheless, I am happy to share the .bin files.?

Thanks for pointing me in in the right direction!? I am going to post these results to the eevblog too, as there were people helping me over there too.?

Rich?

On Sunday, February 20, 2022, 02:24:16 PM EST, Marcus Gustafsson <mankan@...> wrote:


Well done Rich.

Sounds like you have confirmed that 8753D and 8753E have the same EEPROM layout after all.

I did some service guide digging this morning and found some indications that they could be the same.
Br
Marcus

Re: HP8640B manual question

 

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Hello Bill,

?

Try erevisited@... re your 16NN machine.

?

73 de Brian, VK2GCE.

?

From: [email protected] [mailto:[email protected]] On Behalf Of bill K7WXW
Sent: Monday, 21 February 2022 11:10 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP8640B manual question

?

I recently dug out two 8640B sig generators I acquired last year. The newer (SN 16xx) has options 1 and 2 and seems to have RF as far as the counter goes but nothing at the output or the meter. The second (SN 14xx) has no options installed; the output (checked with a spectrum analyzer) is clean and the dials match the measurements.? Both units are in okay mechanical condition, the gearing seems to work okay, and each has the usual collection of dents and dings.? I have a couple of questions:

- I can't find a service or operating manual the covers the serial numbers around 14xx. The earlier manuals stop at 13xx and the newer manuals start at 16xx.? Does anyone know of a manual that covers this range? If not a manual, is there a set of change pages that bridges the gap between 13xx and 16xx?

- The working 8640B does what I need for my bench work and seems to be pretty close to specification wrt frequency and output levels, so I am inclined to just put it on my bench and use it. That said, is there some testing or preventive maintenance I should do?

- The non-working 8640B can probably be fixed but working out gear of this complexity is out of my wheelhouse.? Given that the counter suggests that RF is being generated, if I wanted to dig into the RF section, is the best strategy just to start at the N connector and work my way backwards?

Thanks in advance!

Bill
Re: AM modulated sine wave - Q about oscilloscope triggering

 

Indeed, but who needs a skinless cat at a transmitter site?
TV was more fun, dealing with Vestigial Sideband filters and RF combiners to use a single antenna for NTSC broadcast.
I engineered at one high band VHF and two UHF TV stations, starting almost fifty years ago. One s a full 5MW EIRP site on 1700 feet of tower.
I worked at a few AM stations, as well.


On Sun, Feb 20, 2022 at 5:22 PM Matt Harris <kd4pbs@...> wrote:
You could also use a detector and a low pass filter feeding the trigger input. That's the way we would trigger the scope on amplitude modulated modulated signals from the amplitude modulated modulated transmitters when I was an amplitude modulated modulated radio station engineer. There is more than one way to skin a cat cat ?

Re: HP ic needed

 

It is also used in the 5316B model. I bought two of them on Ebay. at different times. Both work, and they were under $30 each, plus shipping.

On Sun, Feb 20, 2022 at 6:45 PM Paul Bicknell <admin@...> wrote:

Hi

From memory it is only a low frequency counter that go for about ?120 is it worth re-engineering ?

?

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Ford
Sent: 20 February 2022 22:56
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

?

Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH.

?

Jim Ford

?

?

?

Sent from my T-Mobile 4G LTE Device

?

?

-------- Original message --------

From: Joel Setton <setton@...>

Date: 2/20/22 2:21 AM (GMT-08:00)

Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

?

The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument.
Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal.
Pure unobtainum, I'm afraid ...

Joel Setton

HP8640B manual question

 

I recently dug out two 8640B sig generators I acquired last year. The newer (SN 16xx) has options 1 and 2 and seems to have RF as far as the counter goes but nothing at the output or the meter. The second (SN 14xx) has no options installed; the output (checked with a spectrum analyzer) is clean and the dials match the measurements.? Both units are in okay mechanical condition, the gearing seems to work okay, and each has the usual collection of dents and dings.? I have a couple of questions:

- I can't find a service or operating manual the covers the serial numbers around 14xx. The earlier manuals stop at 13xx and the newer manuals start at 16xx.? Does anyone know of a manual that covers this range? If not a manual, is there a set of change pages that bridges the gap between 13xx and 16xx?

- The working 8640B does what I need for my bench work and seems to be pretty close to specification wrt frequency and output levels, so I am inclined to just put it on my bench and use it. That said, is there some testing or preventive maintenance I should do?

- The non-working 8640B can probably be fixed but working out gear of this complexity is out of my wheelhouse.? Given that the counter suggests that RF is being generated, if I wanted to dig into the RF section, is the best strategy just to start at the N connector and work my way backwards?

Thanks in advance!

Bill
Re: WTD: Filter capacitors for 8662A PSU

 

You Could try this.

Still fine and working since I re-built the unit back in 2012.



Regards

Gerald
VK3GJM
Re: HP ic needed

 

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Hi

From memory it is only a low frequency counter that go for about ?120 is it worth re-engineering ?

?

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Ford
Sent: 20 February 2022 22:56
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

?

Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH.

?

Jim Ford

?

?

?

Sent from my T-Mobile 4G LTE Device

?

?

-------- Original message --------

From: Joel Setton <setton@...>

Date: 2/20/22 2:21 AM (GMT-08:00)

Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

?

The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument.
Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal.
Pure unobtainum, I'm afraid ...

Joel Setton

Re: WTD: Filter capacitors for 8662A PSU

 

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Hi Bob,

I long ago gave up trying to find replacement electro caps that are both electrically and physically compatible. Modern ones tend to be quite a bit smaller, so I just either make an adapter board to accommodate the different sizes, or stuff the new ones into the old cans.

If you have no luck finding compatible caps, those might be options to consider.

Cheers
Tom

Sent from my iThing; please forgive the typos and brevity

On Feb 20, 2022, at 14:45, Bob Weiss <bobweiss1967@...> wrote:

?Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.

The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835

I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.

Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?

73,
Bob Weiss N2IXK

Re: HP ic needed

 

¿ªÔÆÌåÓý

Hmmm..... maybe a small programmable logic chip could emulate its functionality?? If that is described in sufficient detail in the HP Journal article.? I have a 5316A that doesn't work properly myself but haven't troubleshot it beyond a quick visual inspection.? HTH.

Jim Ford



Sent from my T-Mobile 4G LTE Device


-------- Original message --------
From: Joel Setton <setton@...>
Date: 2/20/22 2:21 AM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] HP ic needed

The 1820-2131 is used in the 5315A/B and 5316A Universal Counters. I'm not aware if it being used in any other instrument.
Also known as the MRC, "Multiple Register Counter" and described with some detail in the January 1979 issue of HPJournal.
Pure unobtainum, I'm afraid ...

Joel Setton

WTD: Filter capacitors for 8662A PSU

 

Am looking for replacements for the 2 large +/-160V filter capacitors used in the primary side of the SMPS in the 8662A synthesizer.

The original units are Sprague "compulytic" capacitors, rated 600 uf/250V.? Sprague p/n 32DR6593 They are 1.75" diameter, 3.125" long, with a screw spacing of .750".? The HP p/n is 0180-2835

I cannot find any supplier who has these units available, and the closest replacement units I can find are also non-stock, and are 2" diameter with a different terminal spacing.

Does anyone here have a parts mule 8662A they would be willing to rob the caps out of?

73,
Bob Weiss N2IXK
Re: AM modulated sine wave - Q about oscilloscope triggering

 

You could also use a detector and a low pass filter feeding the trigger input. That's the way we would trigger the scope on amplitude modulated modulated signals from the amplitude modulated modulated transmitters when I was an amplitude modulated modulated radio station engineer. There is more than one way to skin a cat cat ?
Re: Mixing 'n' matching S parameter test sets

 

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Thanks, John. I was hoping that was what you¡¯d meant.

?

From: [email protected] <[email protected]> On Behalf Of John Lyles
Sent: Sunday, February 20, 2022 12:36 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Mixing 'n' matching S parameter test sets

?

S parameters, as you know, can be characterized by S11, S21, S12 and S22. The two port test sets have enough directional couplers and power splitters inside to measure all four, by switching the direction of the RF feed, if directed to do all four measurements by the VNA controller. However, the 8754A was built long before that became a necessity for fast bench measurements. There are still just two ports on the test set, I am sorry if I confused the topic. I meant four S parameters being measured.

Re: Looking for power supply schematic of Agilent 83751A

 

On Sun, Feb 20, 2022 at 10:46 PM Dave McGuire <mcguire@...> wrote:


I've seen plenty of capacitors fail shorted, but never an
electrolytic, I guess I've been lucky there.
I've seen exactly 2 aluminium electrolytics failed short circuit so
far in maybe 20 years of repairs, both
were inside HP instruments: one into a HP-3456A ad one was in a HP-5328A
They were enough dead short to pop fuses and blow one pass transistor
in the case of the 5328A.
Just for the record anyway
Frank
Re: Looking for power supply schematic of Agilent 83751A

 

Failing shorted is indeed unusual for these caps. Of the few that I've seen, a good fraction had actually been installed backwards at the factory. Even HP occasionally makes that error, surprisingly enough. The 8657A that I own had failed because of that.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070

On 2/20/2022 13:46, Dave McGuire wrote:

? I've seen plenty of capacitors fail shorted, but never an electrolytic, I guess I've been lucky there.

? What I HAVE seen them do is "almost" short, like 100 ohms or so, boil their electrolyte and blow the wad out the end like a party streamer.

? A very stinky party streamer. ;)

?????????? -Dave

On 2/20/22 15:51, Glydeck via groups.io wrote:
I¡¯ve seen caps fail short and with spectacular results.

<>

<>

<>

Glydeck


On Feb 20, 2022, at 6:39 AM, Dave McGuire <mcguire@...> wrote:

?On 2/20/22 01:28, Lincheng Xiu via groups.io wrote:
After 6 hours troubleshooting, it is fixed. The reason is C35 short. 100uF/50V electrolytic capacitor.
Here is what I traced the partial schematic of HP83751A power supply.
?After C35 short, the PWM controller does not drive the MOSFETs.
Also checked the ESR of C1, which is too much, 2 ohm, it will soon fail, just replaced with a new one.
?Wow, I see electrolytic capacitors like that dry out and lose capacitance all the time, but I don't think I've ever seen one shorted. Nice troubleshooting!

?????????-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Looking for power supply schematic of Agilent 83751A

 

I've seen plenty of capacitors fail shorted, but never an electrolytic, I guess I've been lucky there.

What I HAVE seen them do is "almost" short, like 100 ohms or so, boil their electrolyte and blow the wad out the end like a party streamer.

A very stinky party streamer. ;)

-Dave

On 2/20/22 15:51, Glydeck via groups.io wrote:
I¡¯ve seen caps fail short and with spectacular results.
<>
<>
<>
Glydeck

On Feb 20, 2022, at 6:39 AM, Dave McGuire <mcguire@...> wrote:

?On 2/20/22 01:28, Lincheng Xiu via groups.io wrote:
After 6 hours troubleshooting, it is fixed. The reason is C35 short. 100uF/50V electrolytic capacitor.
Here is what I traced the partial schematic of HP83751A power supply.
?After C35 short, the PWM controller does not drive the MOSFETs.
Also checked the ESR of C1, which is too much, 2 ohm, it will soon fail, just replaced with a new one.
?Wow, I see electrolytic capacitors like that dry out and lose capacitance all the time, but I don't think I've ever seen one shorted. Nice troubleshooting!

?????????-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA




--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP8903B - THD measure on Phono RIAA preamplifier

 

Hi Chris,
yes, I have reduced the input to the phono preamp so as to have the output signal not clipped in the whole band from 20 Hz to 20 kHz (seen on oscilloscope).
With my friends we have made several phono preamps both tube and solid state. No problem with solid state preamps (fet or low noise opamps), while with tube ones they are fine, but it is very difficult to eliminate the hum at the mains frequency (50 Hz) that is heard especially when the turntable arm is raised from the vinile disc.

-- Cheers
? ? Attilio
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