My 8662A looks like your picture on the right, no cable to that connector.? It is Agilent branded and has a 2000 production date.?

On 6/2/22 18:09, Samudra wrote:

HI, I looked around for USB/GPIB and Ethernet/GPIB solutions able to be used with Ubuntu (or, any modern LInux, but I use Ubuntu) OS - on a "ham-friendly" budget. I think the ProLogix Ethernet/GPIB module is about what I can afford, are there others?
I see on this forum others have used Prologix, not sure if they all went ethernet or just USB. For those of you that did go Prologix Ethernet/GPIB, does ProLogix provide good programming tutorials/guides for writing test applications? Did you find any gotchas that you wish you had known? I'm ok with hard programming, and soft programming (scripting) with Python. I can also do C++ or C, etc. I will be using this to probe a future FPGA based RFSoC board and need to run automated tests.
I looked for tutorials on YouTube, but didn't find any if at all... Perhaps I don't know where to look for TCP/IP connected GPIB programming on ProLogix?

A tutorial on that would be pretty short. The command set is a dozen or so commands for both the Ethernet- and USB-connected versions. Instead of looking for a tutorial, I suggest just looking at the manual. With your background, it will be a piece of cake.

The USB version shows up as a serial port on the host machine, and the Ethernet version listens on an IP port. For that, to interact with it directly, you can just telnet to it. Programmatically, any programming language that can open a TCP connection (and I can't think of any offhand that can't) can talk to it.

I've done a lot with these using R, but I think most people want to use Python these days.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

HI, I looked around for USB/GPIB and Ethernet/GPIB solutions able to be used with Ubuntu (or, any modern LInux, but I use Ubuntu) OS - on a "ham-friendly" budget. I think the ProLogix Ethernet/GPIB module is about what I can afford, are there others?

I see on this forum others have used Prologix, not sure if they all went ethernet or just USB. For those of you that did go Prologix Ethernet/GPIB, does ProLogix provide good programming tutorials/guides for writing test applications? Did you find any gotchas that you wish you had known? I'm ok with hard programming, and soft programming (scripting) with Python. I can also do C++ or C, etc. I will be using this to probe a future FPGA based RFSoC board and need to run automated tests.?

I looked for tutorials on YouTube, but didn't find any if at all... Perhaps I don't know where to look for TCP/IP connected GPIB programming on ProLogix?

Lastly, the ProLogix website shows a high price, but it's vendors/distributors show low price, and many similar prices are shown on eBay with Chinese suppliers. Which supplier has tech support that can be recommended? Compared to ProLogix, is there a another commercial product that meets ethernet/GPIB ??

Samudra

On 6/2/22 13:38, Samudra wrote:

?Amazing. Almost the same list of Unix OS versions for me, but I can add one, a summer job out of? high school (1983 for me) , to write a Terminfo entry for a color ascii/graphics mixed terminal for the ICL CLAN Unix multi-user server which was a UK-Japanese blended System V Unix on a terminal that had a color graphics cable screen, a keyboard --
with a key telephone PABX terminal -- and a printer connection (integrated together). I thought that was weird until I had the chance to port Unix OS to Data General MV/10000 (Yes, this was 1989) replacing its AOS/VS operating system.

Are you in the US? You really need to come see LSSM.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

On Wed, May 11, 2022 at 10:37 AM, Chuck Harris wrote:

I started using Linux when Linux was minix... ;-)

I wrote a version of cron for minix, but, for reasons
I don't remember anymore, my cron got ignored, and
they used one written by Andrew T's graduate students.

My first store-bought version of linux was by a compilation
of Slackware sold by Yggdrisel.

My first version of Redhat linux got hacked by Polish
hackers.... It was on dialup at the time, I noticed the
hack because it suddenly slowed down as the modem went
wild... They downloaded a copy of a disk optimizing
utility, and installed it as root. I hung up, and learned
about firewalls.

Before minix, it was an assortment of DEC, Honeywell, Univac,
DG, HP, unix 4,5,6, and BSD... Oh, and CP/M, ISIS, DOS,
Windows, OS/2, Xenix, and QNX...

-Chuck Harris

?Amazing. Almost the same list of Unix OS versions for me, but I can add one, a summer job out of? high school (1983 for me) , to write a Terminfo entry for a color ascii/graphics mixed terminal for the ICL CLAN Unix multi-user server which was a UK-Japanese blended System V Unix on a terminal that had a color graphics cable screen, a keyboard -- with a key telephone PABX terminal -- and a printer connection (integrated together). I thought that was weird until I had the chance to port Unix OS to Data General MV/10000 (Yes, this was 1989) replacing its AOS/VS operating system.?

On Wed, May 11, 2022 at 10:43 AM, Mark Litwack wrote:

?I purchased a Keysight 82357B GPIB<-->USB interface (a real one from them, not a fake from China).? I have not put it into daily use yet, but it is also working under the linux-gpib package.? It presents the same API, so all my scripts still work.? That testing was done on CentOS 7.3, and I have yet to try it on Mint.? I don't anticipate any issues since it's really linux-gpib that's doing all the work.

I have not tried the NI supplied driver.

-mark

Hello Mark, I am considering obtaining a GPIB interface, and looked at choices from eBay at first? but wonder why there is a price difference from the China supplied models, with HP product labeling and so forth, as the US list price is (currently) about $731 ea. Could you assist in helping me figure out why the price difference is so much? But otherwise, I saw that??shows?good linux driver support, but do they (KeySight) provide any ready built applications to access instruments? For example: I have: 8566B spec. an., and a 5342A counter, etc. so - do I write my own control programs (using a library) or do they have a GUI that does this already for any instrument depending upon whats connected?

If this is discussed in a? tutorial (linux-gpib, 82357b, multiple instruments) please help with a link. Otherwise I am very good at programming serial I/O/data acq./command/telemetry, but which command set library did you use - and did you find Python v. C v. C++ in your choices??

Thanks

Samudra

hi Thanks for all your replies I actually have the clips, but the trouble shooting information seems wrong so I'm looking for a service manual for my prefix 2923A but I'm not sure if it exists now on the web.

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Dmitri,

Your second assumption is the right one. If the ESR is too low the power supply will be unstable, the phase margin

is affected severely. ?I have made numerous power supply simulations using LTspice. If the ESR = 0 ohm the simulation

is stuck but if I place a 1 ohm resistor (or other value) the simulation will run through.

?

It took me years to figure out how to deal with the output capacitor in a power supply. What you wish is to confirm that a simulation would match your lab measurements. With the output capacitor in place you cannot easily determine that your design is ok. And the thing is that the output capacitor is not part of the loop but instead part of the load. With the capacitor

disconnected you are able to simulate and measure your design and determine that the phase margin for the loop is good enough. Then you can connect the capacitor with some ESR and the resistive load.

?

G?ran

Hello,

In trying to understand overvoltage shutdown problem of my 8662A I found a curious thing. I have two A7A3 inverter modules. I discovered sensitivity of the supply to the parameters of A7A3C8 (470 uF 16 V electrolytic filter cap on the +5.3V sense). I have tried both modules with 3 different parts:

1. Original 672D, 470 uF, 16 V: measures 250 uF, 0.3 ohms ESR at 10 kHz on my BK 885
2. Nichicon? 470 uF 16 V (likely?UHE1C471MPD6TD): measures 423 uF, 0.046 ohms ESR
3. Nichicon 470 uF 50 V (UHW1H471MPD): measures 512 uF, 0.029 ohms ESR

With the first capacitor installed, the unit starts every time. With number 2 it fails to start (goes to overvoltage shutdown) every 20% to 40% of the time. With the third capacitor installed, overvoltage trip is generated every time.

Scoping +5.3 V sense line I see that the overvoltage trips happen when the regulator breaks out in oscillation. With the second capacitor in place, oscillation does not always happen, but when it does, it takes place when crossing 4.6 V on the +5.3 V sense line. With the low ESR part, oscillation starts immediately upon turn on.

Since the symptoms are identical with two different A7A3 modules, I am tempted to say the problem is in the A7A2 control board. Or, possibly, the fast loop in this switching supply has a minimum acceptable ESR for the in-loop capacitor A7A3C8. Original part is probably around 0.25 ohms ESR when new.

Regards,
Dmitry

? not sure about the dining room table unless you got a real good wife or sufficient funds to bribe her ?
I think the 5342/43 came out in the late 1970s early 80s so that would put this into the 40+ year range of age , the main limits if it comes to fixing things is the availability of parts or suitable replacements , although TTL or CMOS parts are still manufactured things get harder with ECL logic circuits , processors or MMICs especially if they were in TO package


From: [email protected] <[email protected]> On Behalf Of Dave McGuire via groups.io
Sent: Wednesday, June 1, 2022 9:44 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] anyone have broken HP 5342a counter GPIB/HPIB i/f or know of equivalents

On 6/1/22 22:41, Samudra wrote:

I'm not sure what "ham friendly" means, On 5/25/22 17:31,
Samudra wrote:

Well,
<>?is your answer, IMHO.? Also, for
these old (failing) equipment that use TTL/CMOS chips, it's not worth
it to setup a whole test/service lab just to get things working. If it
doesn't work, and can't be reasonably fixed, out it goes - or provided
to someone who needs the spare parts, until all useful life is
scavenged. That actually does sound like what happens at hamfests and
trade between hams.

Oh good grief, this counter isn't THAT old. People fix stuff like this all the time. It's easier with a well-equipped lab, but people fix these things on their dining room tables every day.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

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I have three, ...no extender cards.? Just a lot of teeny-weeny clips and probes.

'Like your comment on 'dining room tables'.

Sometimes you just need to sprawl out.

Don N5CID

======================================================

On 6/1/22 22:41, Samudra wrote:

I'm not sure what "ham friendly" means, On 5/25/22 17:31,
Samudra wrote:
Well, <>?is your answer, IMHO.? Also, for these old (failing) equipment that use TTL/CMOS chips, it's not worth it to setup a whole test/service lab just to get things working. If it doesn't work, and can't be reasonably fixed, out it goes - or provided to someone who needs the spare parts, until all useful life is scavenged. That actually does sound like what happens at hamfests and trade between hams.

Oh good grief, this counter isn't THAT old. People fix stuff like this all the time. It's easier with a well-equipped lab, but people fix these things on their dining room tables every day.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

On Wed, May 25, 2022 at 06:16 PM, Dave McGuire wrote:

I'm not sure what "ham friendly" means, On 5/25/22 17:31, Samudra wrote:

Well,??is your answer, IMHO.? Also, for these old (failing) equipment that use TTL/CMOS chips, it's not worth it to setup a whole test/service lab just to get things working. If it doesn't work, and can't be reasonably fixed, out it goes - or provided to someone who needs the spare parts, until all useful life is scavenged. That actually does sound like what happens at hamfests and trade between hams.?

73 de N3RDX

ok i just read your post on this and you stated that your issue occured after a processor board repair.....
HP as mentioned before uses EEPROMs on each module to store calibration information , the EEPROM content is normally read out and then stored in battery backed RAM for daily use by the firmware , more than likely when you fixed the CPU board the memory content got corrupted and as a result your filter response and probably some other data that was not as obvious was off ,? when you performed the described software operation you cleared the memory and reloaded the calibration data from the boards which subsequently cleared up your problem !
What surprises me a little though is that the analyzer did not reload the good data automatically ,? most instruments i worked on stored a checksum of the memory contents and if the checksum did not line up they pulled the data stored in EEPROM, it could be that they did things differently on the ESA because the unit has multiple EEPROMS ....

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