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Re: Large assortment of H-P parts available

 

On Mon, 29 Aug 2022 at 20:03, greenboxmaven via <ka2ivy=[email protected]> wrote:

Could you please repost the list of equipment in PDF format, so eveyone can read it? Thamks,

Bruce Gentry. KA2IVY


Or you could download LibraOffice, OpenOffice or I expect any number of other programs. LibraOffice works well.

Dave

Re: Large assortment of H-P parts available

 

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Hello Bob,

?

I can¡¯t open your xlsx document.

?

Can you help with the HP-3476A DMM? I have two in which the hybrid 1813-0091 has failed.

?

Cheers, Brian

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Bob Haas
Sent: Tuesday, 30 August 2022 2:53 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Large assortment of H-P parts available

?

I've uploaded an inventory of what we've found so far. The list is shorter than we thought. More parts may be uncovered in the future.

/g/HP-Agilent-Keysight-equipment/files/hpparts.xlsx
Re: Hp 400D serial number decoder

 

I have been told that the "16" part means 16 years since 1960 so about 1976.

regards
Hp 400D serial number decoder

 

A 400D found it¡¯s way home tonight.?

I am trying to decode serial number to approximate its vintage.?

Serial number is 16210. ?That does not seem to fit into any of the decoders I have found to online to date.?

The online manual I have found does mention that serial number range but the is not copyright date on the manual.?


Thanks
Dave
Re: Boonton 25A Power Meter Calibrator ¡°error.¡±

 

Buyer beware. Sometimes it's the small things that get you.

Stuart k6yaz
Los Angeles, California
Re: Boonton 25A Power Meter Calibrator ¡°error.¡±

 

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You can use 478A Opt.: h75 / h76 . They starts @1Mhz to 1GHz ¡­?

Ing. Patricio A. Greco
Taller Aeron¨¢utico de Reparaci¨®n 1B-349
Organizaci¨®n de Mantenimiento Aeron¨¢utico de la Defensa OMAD-001
Gral. Mart¨ªn Rodr¨ªguez 2159
San Miguel (1663)
Buenos Aires
T:?+5411-4455-2557
F:?+5411-4032-0072

On 29 Aug 2022, at 23:18, Steve J. Noll, WA6EJO <sjnoll@...> wrote:

?

Recently someone has been selling brand new Boonton 25A Power Meter Calibrators on eBay at a great price. I picked one up to check my HP 478A mounts and 431C and 432A meters. I find a -5 dB error on all settings! The problem turns out to be that the 25A output (0-100 mW) is at 1 MHz. The 478A mounts are only rated down to 10 MHz and are seriously inaccurate below that.
Boonton 25A Power Meter Calibrator ¡°error.¡±

 

Recently someone has been selling brand new Boonton 25A Power Meter Calibrators on eBay at a great price. I picked one up to check my HP 478A mounts and 431C and 432A meters. I find a -5 dB error on all settings! The problem turns out to be that the 25A output (0-100 mW) is at 1 MHz. The 478A mounts are only rated down to 10 MHz and are seriously inaccurate below that.
Re: Hp8640b

 

¿ªÔÆÌåÓý



-------- Original message --------
From: "Dave ." <ktx85@...>
Date: 8/29/22 6:07 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?

I haven't posted very many times and tried to resend the pictures...


-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/29/22 6:00 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You¡¯ll need to free them up, degrease with something that doesn¡¯t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

20220829_134814_resized.jpg
20220829_134753_resized_1.jpg
20220829_134527_resized.jpg

Re: Hp8640b

 

¿ªÔÆÌåÓý

What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?

I haven't posted very many times and tried to resend the pictures...


-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/29/22 6:00 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You¡¯ll need to free them up, degrease with something that doesn¡¯t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

Re: Hp8640b

 

¿ªÔÆÌåÓý

The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You¡¯ll need to free them up, degrease with something that doesn¡¯t attack them, and put on a bit of fresh grease.

?

HTH,

Dave Wise

?

From: [email protected] <[email protected]> On Behalf Of Dave . via groups.io
Sent: Monday, August 29, 2022 3:44 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8640b

?

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

Hp8640b

 

Hello all,

I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial

I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot

73
Ktx85@...?

20220829_134814.jpg
20220829_134810.jpg
20220829_134802.jpg
20220829_134759.jpg
20220829_134527.jpg

Re: HP-8753E Power Cycles at Start Up

 

Thanks Dan; this problem is happening on an 8753B and an 8753E with old capacitors.
What you experienced is exactly why I don't want to replace the capacitors without a reason. The last thing I need is a second fault.
We suspect something like what you describe but cannot figure what would trip it intermittently.
I just heated the protection circuit then (gently) sprayed it with freeze spray. I also gently moved the 10/220 switch in case it was intermittent.?
It is difficult when I cannot get it to quit again.
Peter

On Mon, Aug 29, 2022 at 5:36 PM Daniel Nelson via <djn=[email protected]> wrote:
Re: Power Supply for 8753E

Peter:

Take a look at the + and - 15V supplies. If the filter cap there draws too much peak current during cycle peaks, the current limit shuts down the supply. I found this when putting in new capacitors and the 'better one' I put in with lower ESR casued this.?

So, do check the voltage drop with a scope on the current limit resistors.....


Dan in Chandler, AZ
Re: HP-8753E Power Cycles at Start Up

 

Re: Power Supply for 8753E

Peter:

Take a look at the + and - 15V supplies. If the filter cap there draws too much peak current during cycle peaks, the current limit shuts down the supply. I found this when putting in new capacitors and the 'better one' I put in with lower ESR casued this.?

So, do check the voltage drop with a scope on the current limit resistors.....


Dan in Chandler, AZ
Re: HP-8753E Power Cycles at Start Up

 

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Peter:

After putting in a new SMPS (Newer SMPS), I have had no failures. I would like to repair the SMPS I pulled but it has not failed yet. This is why I think its a current sense problem.

Rich

On Aug 29, 2022, at 4:56 PM, peter bunge <bunge.pjp@...> wrote:

?
Rich,
Mine are all Sprague and the more I test the?less I think they?are the?problem,?but.....? I should test one.
Right now it is running rock solid.
Has your's failed again? You said you had eliminated A8 as the problem? I have seen dipped tantalums short but they stay shorted.
Peter

On Mon, Aug 29, 2022 at 4:38 PM Rich Miller via <av8torrich=[email protected]> wrote:
Peter:

While I cannot answer your question directly, the capacitor's in mine are Nippon¡¯s. I have seen those last forever without fault. They were sparing no expense in this department when making the supply.?

Off the top of my head, I can¡¯t think of anything I have seen inside this supply that would short intermittently and then recover.?

I had to leave the office, so I am not in front of the supply any longer.?

Rich
Re: HP-8753E Power Cycles at Start Up

 

Rich,
Mine are all Sprague and the more I test the?less I think they?are the?problem,?but.....? I should test one.
Right now it is running rock solid.
Has your's failed again? You said you had eliminated A8 as the problem? I have seen dipped tantalums short but they stay shorted.
Peter


On Mon, Aug 29, 2022 at 4:38 PM Rich Miller via <av8torrich=[email protected]> wrote:
Peter:

While I cannot answer your question directly, the capacitor's in mine are Nippon¡¯s. I have seen those last forever without fault. They were sparing no expense in this department when making the supply.?

Off the top of my head, I can¡¯t think of anything I have seen inside this supply that would short intermittently and then recover.?

I had to leave the office, so I am not in front of the supply any longer.?

Rich
Re: HP-8753E Power Cycles at Start Up

 

¿ªÔÆÌåÓý

Peter:

While I cannot answer your question directly, the capacitor's in mine are Nippon¡¯s. I have seen those last forever without fault. They were sparing no expense in this department when making the supply.?

Off the top of my head, I can¡¯t think of anything I have seen inside this supply that would short intermittently and then recover.?

I had to leave the office, so I am not in front of the supply any longer.?

Rich

On Aug 29, 2022, at 4:18 PM, peter bunge <bunge.pjp@...> wrote:

?
With my 'scope on EN of the reset timer I loaded the 5v with an extra 500 mA and the higher voltage supplies with 100 mA.
The voltage did not change from the?+3v so it would need a short somewhere to trip this I think.
I also blew a hot air gun onto both boards from a distance but not too long. No effect although shutting off the air gun reset the 8753B. A transient from the motor plugged into the same power bar I think. I did it a few times but there was no surging fault.
The connectors inside and outside of the power supply look good and are not loose. Wiggling does nothing.
Note: Both cases of the power supply do not appear to be grounded. Do not use them for 'scope ground, use an extension to the mainframe. Grounding them reduces noise seen on the 'scope if necessary to look at small signals..

To answer the questions I asked earlier.
The board with the six electrolytics is held in place by the spacers and the aluminum block with feedthru capacitors. Remove the two screws on the outside, cut the strain relief, and bend the wires to feed thru the hole.
The capacitors are all 3 hole mounting.
1? ?5500uF 12v
2? ?900 uF 50v
2? ?2200 uF 20v?
1? ?290 uF 63v
What did you guys replace them with? There is not much point pulling them one by one, testing, then re-installing them.
Peter's rule 27 (I was using them long before Gibbs on NCIS) states that the more difficult it is to replace a component the less likely it is to be the problem. How likely is one of them to be intermittent??Tapping does not produce the fault.

Bottom line is I don't know what the problem is.?Maybe a tantalum somewhere, but do they recover? What component fails to a short intermittently?

On Mon, Aug 29, 2022 at 12:36 PM peter bunge via <bunge.pjp=[email protected]> wrote:
My mistake.The reset timer is a 555 and the EN (on my unit) is at 3v well above the 1.7v trip oint?(1/3 of 5v).
Can anyone figure where the 3v comes from? R21 and R20 both connect to 5v. I guess the rectified overcurrent detection has?to be?doing that.
The rectified voltage from the over current circuit drives it negative. The fault detection also connects to this pin and is the open collector of an LM339 comparator if my memory serves me correctly.
I am just guessing that the circuit on the left is a delayed start from the?+10v Bias supply.
The bottom circuit is confusing. The 10v Bias has to be higher than the?+5v?
I need the fault to reappear while I have my 'scope connected.

On Mon, Aug 29, 2022 at 11:25 AM peter bunge via <bunge.pjp=[email protected]> wrote:
The 5v supply MUST have a load on it or the other supplies will not be regulated?correctly (in the manual).
I am running it connected to the 8753B and an easy test is to 'scope the trip EN to the reset timer and add more load until it trips.
I can also jumper a resistor to force a trip as well.
It is worth learning about anyway.
Peter
On Mon, Aug 29, 2022 at 10:59 AM Rich Miller via <av8torrich=[email protected]> wrote:
Not to pile on - I have run the supply outside the case for over an hour. I see no ripple which would alarm me or make me suspect I have a bulk capacitance issue. I too am leaning towards overload trip point. I suppose I will have to figure out some way to load this supply down.?
Re: HP-8753E Power Cycles at Start Up

 

With my 'scope on EN of the reset timer I loaded the 5v with an extra 500 mA and the higher voltage supplies with 100 mA.
The voltage did not change from the?+3v so it would need a short somewhere to trip this I think.
I also blew a hot air gun onto both boards from a distance but not too long. No effect although shutting off the air gun reset the 8753B. A transient from the motor plugged into the same power bar I think. I did it a few times but there was no surging fault.
The connectors inside and outside of the power supply look good and are not loose. Wiggling does nothing.
Note: Both cases of the power supply do not appear to be grounded. Do not use them for 'scope ground, use an extension to the mainframe. Grounding them reduces noise seen on the 'scope if necessary to look at small signals..

To answer the questions I asked earlier.
The board with the six electrolytics is held in place by the spacers and the aluminum block with feedthru capacitors. Remove the two screws on the outside, cut the strain relief, and bend the wires to feed thru the hole.
The capacitors are all 3 hole mounting.
1? ?5500uF 12v
2? ?900 uF 50v
2? ?2200 uF 20v?
1? ?290 uF 63v
What did you guys replace them with? There is not much point pulling them one by one, testing, then re-installing them.
Peter's rule 27 (I was using them long before Gibbs on NCIS) states that the more difficult it is to replace a component the less likely it is to be the problem. How likely is one of them to be intermittent??Tapping does not produce the fault.

Bottom line is I don't know what the problem is.?Maybe a tantalum somewhere, but do they recover? What component fails to a short intermittently?

On Mon, Aug 29, 2022 at 12:36 PM peter bunge via <bunge.pjp=[email protected]> wrote:
My mistake.The reset timer is a 555 and the EN (on my unit) is at 3v well above the 1.7v trip oint?(1/3 of 5v).
Can anyone figure where the 3v comes from? R21 and R20 both connect to 5v. I guess the rectified overcurrent detection has?to be?doing that.
The rectified voltage from the over current circuit drives it negative. The fault detection also connects to this pin and is the open collector of an LM339 comparator if my memory serves me correctly.
I am just guessing that the circuit on the left is a delayed start from the?+10v Bias supply.
The bottom circuit is confusing. The 10v Bias has to be higher than the?+5v?
I need the fault to reappear while I have my 'scope connected.

On Mon, Aug 29, 2022 at 11:25 AM peter bunge via <bunge.pjp=[email protected]> wrote:
The 5v supply MUST have a load on it or the other supplies will not be regulated?correctly (in the manual).
I am running it connected to the 8753B and an easy test is to 'scope the trip EN to the reset timer and add more load until it trips.
I can also jumper a resistor to force a trip as well.
It is worth learning about anyway.
Peter
On Mon, Aug 29, 2022 at 10:59 AM Rich Miller via <av8torrich=[email protected]> wrote:
Not to pile on - I have run the supply outside the case for over an hour. I see no ripple which would alarm me or make me suspect I have a bulk capacitance issue. I too am leaning towards overload trip point. I suppose I will have to figure out some way to load this supply down.?
Re: 54542 won't start, just checking if anyone had this problem before digging in

 

The PSU in my HP 54542C just failed, but only partially. Just started diagnosing, digital supply is fine, scope runs but no A/D or some other analog bits, so seems like one of the analog supplies. Given that the LV side is pretty crude, half-wave with filter caps, I'm assuming it will be relatively easy to fix, bad cap, bad diode, or both. Waiting for a 2ohm load resistor. There is some burnt smell, but I can't visually identify the fault. Caps aren't leaking.

I did get running again by swapping a psu from my 54542A, but I want to repair it.

Anyway, this brings up a question, is this PSU used in any other HP instruments of a similar era? It's a 0950-2369.
Re: Large assortment of H-P parts available

 

On 2022-08-29 3:03 p.m., greenboxmaven via groups.io wrote:
Could you please repost the list of equipment in PDF format, so eveyone can read it? Thamks,
LibreOffice / OpenOffice can read xls(x).

Bruce Gentry. KA2IVY
On 8/29/22 12:52, Bob Haas wrote:
I've uploaded an inventory of what we've found so far. The list is shorter than we thought. More parts may be uncovered in the future.

/g/HP-Agilent-Keysight-equipment/files/hpparts.xlsx </g/HP-Agilent-Keysight-equipment/files/hpparts.xlsx>
Re: HP 5086-7906 YTO

 

What style of output connection is on this YTO? Not whether it's SMA, but how it's mounted to the body. If it's a barrel type screwed into a threaded hole and locked with a nut, you can as a last resort try rotating it, a little at a time. I have an old HP YTO that had way low output because of intermittent connection inside right at the connector. When this happens, you have a tiny capacitance in series with the output, so only a tiny bit of signal gets through, even though the guts are working. Sometimes you can restore operation by changing stress at that joint - maybe temporary, but doable. If the YTO is of a type of construction that can be opened up, it may be possible to actually fix it with soldering or silver DAG.

If you manage to "fix" it by adjusting the rotation, the trick is to make sure that whatever final outside connection is made, can't stress it back to non-working while tightening it up, so it takes careful assembly. Keep in mind that every time one of these YTO connections is undone and redone, for diagnosis or experimenting, it adds to the wear and tear. This is why simply swapping out YTOs can succeed or fail, depending on what happens with marginal connectors.

I'm guessing that you may have two good YTOs if you can restore their connections.

Ed
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