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Date
Re: Frequency References

 

Horizontal space?? I don't see any here.

On 6/21/2024 7:59 PM, Jinxie via groups.io wrote:
Nice to know I'm not the only person to use every single square inch of horizontal space to dump stuff.
Re: Frequency References

 

Nice to know I'm not the only person to use every single square inch of horizontal space to dump stuff.
Re: HP 3325

 

I think a lot of people here are over-thinking this. We are talking
about a linear power supply, not some super fancy microwave sauce
using ill explained magic modes of operation. Odds are good the modern
parts having higher beta and etc are not going to make things worse.

Put an equivalent load on the output of the power supply, install the
replacement "unselected" part, and see if it works by checking the
output voltage and ripple with a power resistor as a dummy load.
Assuming you know how to safely work around 120V line circuits I don't
see the harm in testing in this manner.

The only part mode where this could be out of spec and not cause
something totally obvious would be if it adds extremely low frequency
ripple you can't measure for.

If I am wrong there are other transistors of the same type in the
power supply. Take one out and measure it.

-Evan Foss

On Thu, Jun 20, 2024 at 8:03?PM Joe White via groups.io
<skinnershorse@...> wrote:

These are from the power supply board of a 3325. Per OSM they are p/n 03325-66901, 03325-66902, 03325-66903 (left to right), described as "XSTR ASSEMBLY". The manufacturer is listed as HP. I have not found the part numbers in any cross-reference lists and I have been unable to identify the parts by their markings. Any help on identifying the parts and/or replacements is greatly appreciated.
--
Joe White
KW4YW


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Re: Frequency References

 

You¡¯re right. It didn¡¯t sound good. ?

Pete liked to sleep with his LNAs. Here¡¯s a shot of me with Pete. I was there buying TE and LNAs.


--
Frank Mackowick
Crownsville, MD.

image0.jpeg

Re: Interfacing the HP3490A with AR488

 

Getting it working in Talk Only is a good first step.? Well done.

In Addressable mode, try sending a Trg (Bus Trigger Command) "then" addressing it to talk.? I.e.? Getting the AR488 to do a bus data read.

You will probably need to check and find out how the instrument "Terminates" a data reply, to get the AR488 read command setup properly.

"EOI" is usually safe, but it can be (or also) a single or double byte (cr or cr/lf for example, with/without EOI with the last byte.)

The AR488 is a good device, but using a serial terminal emulator to drive it, is hard work to say the least, but one does learn fast!

Best use some? Prologix compatible software, or roll your own in whatever language you are happy with!

On Windows, with a little fiddling of the Arduino code relating to how it ID's itself, i think you should be able to use the excellent EZGPIB package to build teat schemes etc..

Regards..

Dave B.
Re: HP 3325

 

Just to put my 2 cents into the mix.
Back in the 1970¡¯s HP had a specific approved parts list, that everyone in the company was supposed to use to design test equipment from. If a needed part was not on the list then it had to go through an approval process before it could be added.
Selected parts were generally found either on the approved list or new parts to be approved. They were selected by certain parameters: stability, noise, repeatability from one device to another (consistency), frequency specs, impedance, etc.
What is discovered over time (42 yrs. of repairing HPAK ETE), that whatever the selected part base number was, ie. selected 2N2019, within 1-3 yrs of production of that part, whether it was a transistor or IC, or many other components, the common base no. would make the specs. of the selected part, because the component manufacturers were constantly improving their processes all the time. I have used this rational over the last 30yrs. and once I determine the common part number for the selected, I would use the common number part to replace the selected part. I never had a repaired instrument (using the common vs. selected part) fail to meet specs./ HPAK calibration, or cause a noticeable difference in performance to my eye.
Don Bitters
Re: VISA problems with ancient test equipment?

 

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Hi Ernst,

?

?

To follow up on the last email I sent you, here is a basic example in Python.

?

However, you must activate the Keysight-NI-488-2 compatibility option in Connection Expert.

?

?

Yves

?

?

De?: [email protected] <[email protected]> De la part de dk1vi via groups.io
·¡²Ô±¹´Ç²â¨¦?: 18 juin 2024 13:13
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] VISA problems with ancient test equipment?

?

Hello Yves_Tardif,
unfortunately my initial answer bounced from the email address you sent me your program.
Thanks for your program. The 5350B is really a weird beast!
I made some initial tests on friday following your instructions. At first not working. Had to remove checkmark in Keysight Communicator -> Settings -> "Enable Keysight GPIB cards for 488 programs". Now it worked, but some measurements showed "0".

Over the weekend I was busy with other obligations. So I tried again today with no success. Hitting "Stop" did not work so I could not select Input 2.
Input 1 not working because of fried sampler. This was the reason the counter was donated to me.

Regards Ernst?

image002.png
output.PNG
5350B.txt
5350B.txt

Re: Frequency References

 

¿ªÔÆÌåÓý

Hi ¨C

?

Do you know if it still locks? What about lamp voltage? 73 ¨C Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

?

From: [email protected] <[email protected]> On Behalf Of n4ua
Sent: Friday, June 21, 2024 2:41 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References

?

If you want to really splurge on a house reference, have I got just the thing. I should get rid of my Stanford Research Systems FS725 Rubidium standard. It was used continuously for about one year back in the oughts in one of our (my previous employer) off-shore mfg sites. It has seen little use since then; I fire it up about once a year for some sort of test, but my time-nuts days are behind me. This box has Option 3 (18 outputs - all you can add) and it does not have a scratch on it.

?

If you are interested, please contact me off list. Thanks...

?

geo
Re: Frequency References

 

I've seen a fair amount of stuff go to landfill after the passing of the collectors.? Neither the families nor estate lawyers nor courts (ESPECIALLY courts) have any idea what to do with it and will NOT listen to anyone trying to give any advice.? One very sad case recently, heartbreaking knowing what was trashed.

The prices you see are like on ebay where people look at listed prices and copy them.? The stuff sits and sits and never sells.? I recently was looking at an item which originally sold for $12-15k, asking prices were uniformly $999-2500 for decent ones and $899 one with slight damage.? I offered $200 to a bunch of the sellers and they all came down significantly, with one offering it for $300.

The prices are generally far more reasonable on these lists.? If I ever shut down my lab or significantly downsize the prices will be excellent as well, but the collectors who demand top dollar, well, see what I said above.? For a sale to occur supply must equal demand for that transaction.? The heavy discounting which occurs upon asking in a free and open marketplace tells me all I need to know.

Peter

On 6/21/2024 1:55 PM, Roy Thistle via groups.io wrote:
On Fri, Jun 21, 2024 at 07:26 AM, Peter Gottlieb wrote:

There looks to be an increasing amount of gear popping up and decreasing
interest

IME, and IMO... I don't see that trend... at all.
What's "popping up" is prices, and even ridiculous prices for gear that's in pretty bad shape too.

Some of that nonsense is driven by YouTube "influencers" and the mis-belief? they propagate... that one can 'fix' gear, and resell it for 10X what one paid for it... if only one can figure out what a capacitor is... and which end of a soldering iron to use, to un-solder it.
Re: k&s 1470 Wire bonding reconstruction

 

Let me see what I can find, Massimo.? ?I used to work for Orthodyne Electronics, which has since been acquired by K&S.? I'll check with my contacts at K&S Orthodyne.? ? ? ? Jim Ford, Laguna Hills, California, USA?


On Fri, Jun 21, 2024 at 8:36 AM, iv3hed@...
<iv3hed@...> wrote:
Hi,

A couple of months ago I bought a k&s 1470 wire bonding head to build my own on budget bonding machine for repair the famous HP yig oscillators.

I have finished reconstructing the mechanical parts of the bonding, but to start making the electrical part I need the service manual of the head.

I don't know if this is the correct group, but i hope sameone can help me find the service manual to finish this "big" project.

Best regards,
Massimo

Re: Frequency References

 

If you want to really splurge on a house reference, have I got just the thing. I should get rid of my Stanford Research Systems FS725 Rubidium standard. It was used continuously for about one year back in the oughts in one of our (my previous employer) off-shore mfg sites. It has seen little use since then; I fire it up about once a year for some sort of test, but my time-nuts days are behind me. This box has Option 3 (18 outputs - all you can add) and it does not have a scratch on it.

If you are interested, please contact me off list. Thanks...

geo

FS725c_datasheet.pdf
FS725c_datasheet.pdf

Re: Frequency References

 

On Fri, Jun 21, 2024 at 07:26 AM, Peter Gottlieb wrote:
There looks to be an increasing amount of gear popping up and decreasing interest
IME, and IMO... I don't see that trend... at all.
What's "popping up" is prices, and even ridiculous prices for gear that's in pretty bad shape too.

Some of that nonsense is driven by YouTube "influencers" and the mis-belief? they propagate... that one can 'fix' gear, and resell it for 10X what one paid for it... if only one can figure out what a capacitor is... and which end of a soldering iron to use, to un-solder it.
Re: Frequency References

 

On June 21, 2024 12:39:03 PM "Frank Mackowick via groups.io" <fpmacko@...> wrote:
Reminds me of Pete's place back in the glory days.

Frank / WA3NHK

Roadtrip to Pete's place March 2019.
Wow, I remember that bedroom.

(and wow, that didn't sound good..)

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Frequency References

 

Reminds me of Pete's place back in the glory days.??

Frank / WA3NHK

Roadtrip to Pete's place March 2019.
Re: Interfacing the HP3490A with AR488

 

ATN is how the controller signals to its loyal supplicants that it
has a command for one of them to obey.

If you have the AR488 configured as a controller, it will set ATN
automagically.

-Chuck Harris

On Fri, 21 Jun 2024 07:20:09 -0700 "Joel Setton" <setton@...> wrote:
Hello everyone,

I am trying to control an HP3490A DVM from a PC via GPIB with an
Arduino-based AR488, using PuTTY as the user interface. So far, two
things already work :
- When the 3490A is in "talk only" mode, measurement data is received
and displayed as expected
- When in "addressed" mode, I am able to control the functions of the
3490A (select functions, switch ranges etc ...) as explained in table
3-7, page 3-10 of the 3490A manual. However, when in "addressed"
mode, I can control the 3490A but I can't receive measurement results
over the HP-IB. It seems that the 3490A requires the ATN line to be
activated, but the AR488 manual doesn't provide any information on
how to do that. Is there anything "special" which must be done to
read data from the 3490A ? Any help would be appreciated ... the
3490A is a very nice beast !

Thanks,
Joel Setton
k&s 1470 Wire bonding reconstruction

 

Hi,

A couple of months ago I bought a k&s 1470 wire bonding head to build my own on budget bonding machine for repair the famous HP yig oscillators.

I have finished reconstructing the mechanical parts of the bonding, but to start making the electrical part I need the service manual of the head.

I don't know if this is the correct group, but i hope sameone can help me find the service manual to finish this "big" project.

Best regards,
Massimo

WhatsApp Image 2024-06-09 at 20.37.51.jpeg
Bonding.jpg

HP3048 data file format?

 

Hello!

I am new to this group, old engineer, a ham (S57UUU), and playing with radio astronomy.

I have a HP3048 setup, which is working well (knock on wood). I am using the DOS software. For now I can store the results only graphically, using a screen grabber ("screen thief"). The software will write a data file, but it is binary, and somehow, I can't figure it out. Used a hex editor which can also represent the data as floats, etc. but no luck.

Does maybe somebody have the format specification for these files?

Marko Cebokli
Re: Frequency References

 

I better keep going to the gym so I can help move collections like this in the future.

Then I can save on the gym memberships and get my workouts that way.

There looks to be an increasing amount of gear popping up and decreasing interest, sadly.

Peter

On 6/21/2024 10:18 AM, Mike Feher via groups.io wrote:

Sadly, that is true. And, that is just the lab. About 5% of what is here. Now, at my age, I cannot lift them ?. Another thing for my kids to worry about. ¨C Mike

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Peter Gottlieb
Sent: Friday, June 21, 2024 10:12 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References

You still have significant tonnage there.

Peter

On 6/21/2024 9:48 AM, Mike Feher via groups.io wrote:

When I was still using my lab, I used a single Rubidium to run everything.
Now, everything is just sitting there dormant. 73 ¨C Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
908-902-3831
-----Original Message-----
From: [email protected]
<mailto:[email protected]>

<[email protected]
<mailto:[email protected]>> On Behalf Of Chuck Harris

Sent: Friday, June 21, 2024 8:32 AM
To: [email protected]
<mailto:[email protected]>

Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References
More importantly, they will be out of phase because they will be set
to different frequencies...
If you had a farm of synthesizers, all identical, they would still
likely be set to different phases because they started generating at
different times.

-Chuck Harris
Interfacing the HP3490A with AR488

 

Hello everyone,

I am trying to control an HP3490A DVM from a PC via GPIB with an Arduino-based AR488, using PuTTY as the user interface.
So far, two things already work :
- When the 3490A is in "talk only" mode, measurement data is received and displayed as expected
- When in "addressed" mode, I am able to control the functions of the 3490A (select functions, switch ranges etc ...) as explained in table 3-7, page 3-10 of the 3490A manual.
However, when in "addressed" mode, I can control the 3490A but I can't receive measurement results over the HP-IB. It seems that the 3490A requires the ATN line to be activated, but the AR488 manual doesn't provide any information on how to do that.
Is there anything "special" which must be done to read data from the 3490A ?
Any help would be appreciated ... the 3490A is a very nice beast !

Thanks,
Joel Setton
Re: Frequency References

 

¿ªÔÆÌåÓý

Sadly, that is true. And, that is just the lab. About 5% of what is here. Now, at my age, I cannot lift them ?. Another thing for my kids to worry about. ¨C Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

?

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Peter Gottlieb
Sent: Friday, June 21, 2024 10:12 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References

?

You still have significant tonnage there.

?

Peter

?

?

On 6/21/2024 9:48 AM, Mike Feher via groups.io wrote:

>?

> When I was still using my lab, I used a single Rubidium to run everything.

> Now, everything is just sitting there dormant. 73 ¨C Mike

>?

> Mike B. Feher, N4FS

>?

> 89 Arnold Blvd.

>?

> Howell NJ 07731

>?

> 908-902-3831

>?

> -----Original Message-----

> From: [email protected]

> <[email protected]> On Behalf Of Chuck Harris

> Sent: Friday, June 21, 2024 8:32 AM

> To: [email protected]

> Subject: Re: [HP-Agilent-Keysight-equipment] Frequency References

>?

> More importantly, they will be out of phase because they will be set

> to different frequencies...

>?

> If you had a farm of synthesizers, all identical, they would still

> likely be set to different phases because they started generating at different times.

>?

> -Chuck Harris

>?

>

?

?

?

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