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Date
Re: A document about the 8165A

 

As always, an absolutely beautiful document, for the mind and the eyes.

Thanks!
Re: 85719A Noise Figure Measurements Personality for HP8595A

 

I'm pretty certain the analyser will use the Y factor method (not the gain method) so an external noise source (HP 346B?) and an external preamp is needed (HP 87405A would be good here as it can be powered from the front panel of the analyser).

Hopefully, the analyser has the 28V drive port at the rear and this is probably the internal hardware that is required for this option. If so it might be possible to clone an existing SW card and plug it in and it would all work. I'm not sure if it can be loaded via GPIB.
Re: HP 427A no DC offset adj. pot

 

EDIT:
The latest manual I've found is 00427-90005. ?I saw?00427-90008 referenced in a comment on a web page but haven't found it anywhere.

Leon...
HP 427A no DC offset adj. pot

 

Hello,
I recently acquired a Govt. Surplus (Air Force) HP 427A, SN/ 947-A19375. ?I was going to adjust the DC offset according to section 5-30 of the manual but the A2 board doesn't have the A2R7 pot for this. ?It also doesn't have the A2R17 pot depicted on the schematic as well. ?The latest manual version I have found online is 00427-90008 and it reflects the presence of both of those pots. ?Can anyone advise me on the DC offset procedure for this unit or perhaps direct me to the most recent manual? ?Thank you,

Leon...
HP plotter film hp7470 and color pro plotters

 

Have a new box unopened, 50 sheets 81/2 x 11 plotter film.?
Contact me via PM if interested.?

hp_plotter_sheets.JPG

Re: 85719A Noise Figure Measurements Personality for HP8595A

 

On Thu, Mar 28, 2024 at 05:47 AM, vk2bea wrote:
HP8595A
Michael,?

You need the personality module reader that attaches to the rear of the 95A. The card is read by the?
reader and uses the noise marker mode and the noise measurement method is the GAIN method of?
noise figure techniques. Today, sometimes referred to as the cold source method. The SW optimizes
the SA to obtain a low noise capability, takes into account the NEBW, etc... You most likely will need?
an LNA in front of your analyzer particularly if you are trying to do low noise measurements. Required?
to avoid the 2nd stage NF contribution from the SA.?
85719A Noise Figure Measurements Personality for HP8595A

 

I have the option hardware in my HP8595A for noise figure measurements but not the HP 85719A Noise Figure Measurements Personality card.
Presumably this is just software. Does anyone have this (downloaded from the card)? Can this be loaded to the analyzer via GPIB or must I have an actual HP / Epson memory card?
Michael
Looking for replacement ECL logic chips etc, for HP 8160A Pulse generator.

 

I've just dragged out my 8160A pulse generator to finally get it working, and I am in need of a few ECL logic chips and a custom HP chip too.

The troubleshooting I've done so far has me down to 3 possible faulty parts on the 'grey' card in position A228. I have designed some riser cards which will be delivered in a week or two to let me access the card and probe it whilst powered up to narrow down the fault further.

These parts are the most likely culprits so far:
U3 - 1820-2149 - HP Custom chip - Dual Gate
U6 - 1820-0802 (MC10102P) - ECL Quad 2-Input NOR Gate
U7 - 1820-1482 (MC10211P) - ECL Dual 3-Input/3-Output NOR Gate

I see a service note (# 8160A--15) exists to replace the 1820-2149 chip, so there's a likely candidate... (Does anyone have any copies of service notes for the 8160A they can upload?)


Does anyone have any of these chips in their stash that they can post to Japan for a reasonable cost?


Thanks!
Jared
Re: How to Test an NE75 Neon Lamp

 

After reassembling the [now clean] time-base, DS101 is still not illuminated.? I've checked the +100V rail and that checks at 99.x volts (don't remember the exact fractional part).

I had not previously removed the top cover to observe the time-base.? With the cover removed, pressing the RESET switch causes a neon lamp (V105?) towards the back, right side of the main circuit board to illuminate so at least part of that circuitry is working.

I'm guessing the problem has something to do with Q109.? The -100V rail appears to be a crucial part of that circuit too.? I didn't check that rail but intend to do so tomorrow.

Thanks,
Barry - N4BUQ

From: "Barry" <n4buq@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Tuesday, March 26, 2024 11:48:38 PM
Subject: Re: How to Test an NE75 Neon Lamp
I got around to testing that lamp.? With R135 and R136 still in place, I connected to the end marked +100V and the other side of the lamp to ground.? The lamp fires very close to 90V so it's still good.? Looks like I get to start troubleshooting why it doesn't work (presuming it still doesn't) when I get the plugin reassembled.

Thanks,
Barry - N4BUQ

From: "Barry" <n4buq@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Tuesday, March 26, 2024 8:15:24 AM
Subject: Re: How to Test an NE75 Neon Lamp
Ozan, David,

Thanks so much for the replies.? The two resistors (R135 and R136) are both mounted with the lamp so I can power it with R135 in series.? Since that lamp should be lit in both NORMAL and SINGLE and both modes appeared to be working, then I'm even more suspect of the lamp.? Testing it out of the circuit will confirm that one way or the other.

Thanks guys,
Barry - N4BUQ

From: "Barry" <n4buq@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Monday, March 25, 2024 11:33:32 PM
Subject: How to Test an NE75 Neon Lamp
The ready lamp for SINGLE triggering mode in my HP 1421A isn't/wasn't working. ?I'm not sure what the problem is but I have removed the front panel to clean it and before I reinstall it, I'd like to determine whether the lamp is good as it's fairly messy to remove the front panel to get to it.

From what I can tell, there's about 50V across that but not sure if that's when the lamp is supposed to be on or off so I'm not sure if that's enough to turn the lamp on.? I'm not finding much in the way of specs for an NE75 either.

Anyone know how I can test it?


Thanks,
Barry - N4BUQ
Re: 11048C feed through termination data?

 

Just checked a couple of my changes and they are still there. They are verymuch corrections of factual errors where I had first hand knowlege.

I find Wikipedia most useful as a source of references.

Re: Service Notes on HPWiki

 

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Great work.

?

You made a difference in our insatiable thirst for more technical information.

?

Ross

?

From: [email protected] <[email protected]> On Behalf Of ebrucehunter via groups.io
Sent: Tuesday, March 26, 2024 3:22 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Service Notes on HPWiki

?

Thanks very much.? Like John, I was astounded with all the things that were totally new to me.

Regards,

Bruce, KG6OJI

Re: A document about the 8165A

 

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Thanks Friends,

Happy to see that I am not alone on the 8165A. So I will have at least one reader!

Now I am fighting against an 8160A which I purchased for few euros as not working. Channel A is now happily running, and I am going to try to fix the channel B (Option 020).

It¡¯s a wonderful instrument, definitely love! I can understand it costed 67,000 dollars, referred to today...

Il giorno 27 mar 2024, alle ore 01:16, Philip Freidin via groups.io <philip@...> ha scritto:

Another one of your superb books, and especially as I just purchased a 8165A last week.

So much to read and enjoy
Philip

Re: HP8640B

 

Hi GH,
IF I find the problem you mean! ;-) But if I can't you will hear about it, no doubt...
But I will GH. It would be a shame not to add my little bit of knowledge here.
Not much time to dig in it right now though.
Renaud
Re: How to Test an NE75 Neon Lamp

 

I got around to testing that lamp.? With R135 and R136 still in place, I connected to the end marked +100V and the other side of the lamp to ground.? The lamp fires very close to 90V so it's still good.? Looks like I get to start troubleshooting why it doesn't work (presuming it still doesn't) when I get the plugin reassembled.

Thanks,
Barry - N4BUQ

From: "Barry" <n4buq@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Tuesday, March 26, 2024 8:15:24 AM
Subject: Re: How to Test an NE75 Neon Lamp
Ozan, David,

Thanks so much for the replies.? The two resistors (R135 and R136) are both mounted with the lamp so I can power it with R135 in series.? Since that lamp should be lit in both NORMAL and SINGLE and both modes appeared to be working, then I'm even more suspect of the lamp.? Testing it out of the circuit will confirm that one way or the other.

Thanks guys,
Barry - N4BUQ

From: "Barry" <n4buq@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Monday, March 25, 2024 11:33:32 PM
Subject: How to Test an NE75 Neon Lamp
The ready lamp for SINGLE triggering mode in my HP 1421A isn't/wasn't working. ?I'm not sure what the problem is but I have removed the front panel to clean it and before I reinstall it, I'd like to determine whether the lamp is good as it's fairly messy to remove the front panel to get to it.

From what I can tell, there's about 50V across that but not sure if that's when the lamp is supposed to be on or off so I'm not sure if that's enough to turn the lamp on.? I'm not finding much in the way of specs for an NE75 either.

Anyone know how I can test it?


Thanks,
Barry - N4BUQ
Re: 5086-7337 *Yig Oscillator issue*

 

Refreshing:

still looking for a medium size knob for my 83592A rf plugin rpg :)

anyone who wants sell it, please PM

Thanks!
Re: 11048C feed through termination data?

 

I've found Weak-ipedia to be a politicized cesspool of ignorance,? like much of Reddit.? People just delete things they don't like regardless of accuracy.?


On Tue, Mar 26, 2024, 7:51?PM Jim Ford <james.ford@...> wrote:
I had a similar experience with Wikipedia about 10 years ago.? I wrote some stuff on the phase lock loop page about how one can think of the inputs to the phase detector as 2 cars going around a racetrack, track position being analogous to the phase difference, and speed being analogous to frequency.? I thought it was an easy-to-understand way to explain it.? But somebody thought otherwise and deleted my entry.? I have not submitted anything since then.? I should have asked why.? ? ? ? ? Jim Ford?



Sent from my T-Mobile 4G LTE Device


-------- Original message --------
From: "Roy J. Tellason, Sr." <roy@...>
Date: 3/26/24 1:47 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] 11048C feed through termination data?

On Monday 25 March 2024 12:25:40 pm Dave McGuire wrote:
> On 3/25/24 12:24, Robert G8RPI via wrote:
> > Yes
>
>??? Bravo, I'm glad to hear it.? Lots of people whine about errors in
> Wikipedia articles, but almost no one puts their money where there mouth
> is and corrects them.
>
>????????????? -Dave
>

I made a few small additions to two or three pages there,? and they got immediately removed.? So I went badk in there and un-did that,? and suggested that if somebody had a problem with what I'd done that we should talk about it.

Just checked,? they're not in there now.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Re: 11048C feed through termination data?

 

¿ªÔÆÌåÓý

I had a similar experience with Wikipedia about 10 years ago.? I wrote some stuff on the phase lock loop page about how one can think of the inputs to the phase detector as 2 cars going around a racetrack, track position being analogous to the phase difference, and speed being analogous to frequency.? I thought it was an easy-to-understand way to explain it.? But somebody thought otherwise and deleted my entry.? I have not submitted anything since then.? I should have asked why.? ? ? ? ? Jim Ford?



Sent from my T-Mobile 4G LTE Device


-------- Original message --------
From: "Roy J. Tellason, Sr." <roy@...>
Date: 3/26/24 1:47 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] 11048C feed through termination data?

On Monday 25 March 2024 12:25:40 pm Dave McGuire wrote:
> On 3/25/24 12:24, Robert G8RPI via groups.io wrote:
> > Yes
>
>??? Bravo, I'm glad to hear it.? Lots of people whine about errors in
> Wikipedia articles, but almost no one puts their money where there mouth
> is and corrects them.
>
>????????????? -Dave
>

I made a few small additions to two or three pages there,? and they got immediately removed.? So I went badk in there and un-did that,? and suggested that if somebody had a problem with what I'd done that we should talk about it.

Just checked,? they're not in there now.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Re: A document about the 8165A

 

Another one of your superb books, and especially as I just purchased a 8165A last week.

So much to read and enjoy
Philip
Re: Service Notes on HPWiki

 

Thanks very much.? Like John, I was astounded with all the things that were totally new to me.

Regards,

Bruce, KG6OJI
Re: 11048C feed through termination data?

 

On Monday 25 March 2024 12:25:40 pm Dave McGuire wrote:
On 3/25/24 12:24, Robert G8RPI via groups.io wrote:
Yes
Bravo, I'm glad to hear it. Lots of people whine about errors in
Wikipedia articles, but almost no one puts their money where there mouth
is and corrects them.

-Dave
I made a few small additions to two or three pages there, and they got immediately removed. So I went badk in there and un-did that, and suggested that if somebody had a problem with what I'd done that we should talk about it.

Just checked, they're not in there now.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
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