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Date
Re: Hp 8590a eeprom problem.

Richard Cook
 

Thanks Glenn,? I appreciate that valuable info!. Programers for that chip are not cheap too.?
Thanks
Re: Suffering from RIFA anxiety!

 

On the does the epoxy crack on it's own or does the inside swell and crack it question, I had emprical evidence many years ago. This was postthe first knownspate of RIFA failures I knew of which was in BBC B computer PSUs.? I bought a quantity of equipment and parts that had beed stoered in a garage for years. There were several carbboard boxes / "trays" of NOS RIFA self healing capacitors. Some had sealed plastic bags over the whole box, some didnt. None of sealed capacitors showed any sign of craking or swelling. The open ones were swoolen and cracked. I noted two other things,
Where the capactor "roll" was not centered in the moulding the cracking and swelling was assemetric being worse on the side with the thinnest expoy
On a box without a bag that was sandwiched between two boxed ones there was a clear progression of damage with the ones on the outside being very swollen and those in the middle undamaged.

From this I posit that the epoxy is not impermeable to moisture and the paper used is hygroscopic. In damp conditions moisture gets into the paper making it swell an cracking the epoxy letting more moisture in. This results in a accelerating failure.

The only inlet filter RIFA failures I've seen were in ex MOD Solartron 7150 DMM's This could be due to a bad batch or poor storage between withdrawal from service and eventual fail.

Robert G8RPI.
Re: OT, R&S SNA-23

 

Hi Gerald,
just a side note: The SNA-23 was built by Wandel & Goltermann, not R&S. There is a dedicated "WG-Fans" forum @ groups.io. Not very active but a possible source of more information.
Regards
Andreas
Added Folder /ITU-T G.703 - 1PPS Physical Layer Specification #file-notice

Group Notification
 

si_emi_01 <wellington@...> added folder /ITU-T G.703 - 1PPS Physical Layer Specification
Re: 8341B vs 8673B

 

What's your plan to go up to higher frequencies? Start with instruments like the 8340 and use doublers etc?
That is one possibility. Another approach I think about is siggen + harmonic distortion + filter bank.

I am very worried about phase noise, especially as I climb the spectrum. But I think I am comfortable working my way up. Maybe I'll have to sell a less capable machine to finance a more capable one, but I'd rather have some experience under my belt before investing more money, even if it costs a little more in the long run.

But maybe a lower phase noise fundamental out of a sigal generator is worth some extra complexity now to save myself some growing pains later!

Tough decisions!
Re: Z3801A GPS (Was Z3804A)

 

¿ªÔÆÌåÓý

Hi Dan,

?

You did a great job Integrating the Power Supply, Distribution Amplifier and other features into the single assembly.

?

I did have a comment about the 1PPS Signal implementation. The design includes a 555 Timer Chip to provide the 1PPS Output. The 555 Timer Rise/Fall Time is quite slow (appears as a delay from the real time mark), if you intend to use the 1PPS, there is an ITU Specification for the 1PPS Output. The critical performance Specifications to meet are listed below:

?

17.2.1 Performance specification

This signal indicates the significant event occurring on the midpoint of the leading edge of the

signal.

?

The system must generate a positive pulse on the 1PPS signal such that the midpoint of the leading

edge of the signal at the edge of the chassis occurs at the one second roll-over of the system.

?

The pulse width must be between 100 ns and 500 ms.

?

10-90% rise times of the 1PPS pulse should be < 5 ns.

?

This interface is intended to be used with an impedance controlled 50ohm cable with a maximum

length of three metres to keep the influence of delay and rise time low.

?

1PPS signal generation accuracy of the timing master is ¡À5 ns Measured at the 50% amplitude level.

?

17.2.2 Voltage levels

Table 17-6 gives voltage levels for the interface for information.

Table 17-6 ¨C Output voltage levels

Interface ??????? ??????????????????????? VOH (max) ??? VOH (min) ???? VOL (max) ???? VOL (min)

1PPS (50 ohm single-ended) ???? 5.5 V ?????????????? 1.2 V ?????????????? 0.3 V ?????????????? ¨C0.3 V

NOTE ¨C Measured with a 50ohm load to ground.

?

?

The ITU Specification was released in 2013 and there are a lot of devices now that can meet those requirements with ease. Those devices have very low TPD and very fast edge rates.

?

Essentially, for my design, I buffered the signal with a 74LVC2G14, constructed my positive going pulse with 74AS08 Logic and a 74LS123 One Shot for the Pulse Width. You need the 74LVC and 74AS Logic to provide the low latency leading edge to trigger the One-shot (which can be slower and variable to create the pulse width you desire ¨C I used a pot with a range of 500ns to 4us), and then a 74AS08 to recombine the signals.

?

You get a 1PPS fast Rise Pulse of tailored with. The Output Buffer is a Parallel of 74LVC2G14 again with 47 Ohm Series Terminator to the connector. The unused gates and One-Shot were terminated to minimize noise in the circuit.

?

I posted the ITU-T G.703 1PPS Physical Layer Specification to the Files section.

?

I really liked what you did with the whole packaging.

?

Did you sniff the cables connected cables to see if they spread 10MHz EMI in the area of your Lab? With the Isolated Output Connectors and Isolation Transformers in the design, I was wondering if you see any problems there? The 10MHz Digital Driver used is a 75176 which has relatively fast edges too.

?

It also looks like you didn¡¯t need to shield the Power Supply too, that¡¯s good.

?

Nice job.

?

Ross

?

From: [email protected] <[email protected]> On Behalf Of Daniel Nelson via groups.io
Sent: Sunday, September 11, 2022 1:30 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Z3801A GPS (Was Z3804A)

?

And this was my solution in 2004:



Dan in Chandler, AZ

Re: Suffering from RIFA anxiety!

 

A litle rescript I did long ago...

At 12:18 AM 13/09/2022 +0000, you wrote:
I think this thread should have been named "RIFA Madness" (you know, in homage to the old movie...)
Jeff Kruth

RIFA_caps.jpg

Re: Looking for Agilent PNA old FW repo?

 

¿ªÔÆÌåÓý

Kevin,

?

I tried to track down this lost content earlier this year but did not have much luck. ?Fortunately another list member had the specific files I was looking for.

I mentioned it to some folks at Keysight who were ¡°looking into it¡± but afaik nothing has happened since then.

What specific content are you looking for?

?

Jeff

?

?

?

From: [email protected] <[email protected]> On Behalf Of Kevin A. via groups.io
Sent: Monday, September 12, 2022 8:44 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Looking for Agilent PNA old FW repo?

?

Hi all,

?

Does anyone have a copy of the Agilent/KS PNA legacy firmware files? This page was up until very recently, and of course now I am working on an old unit that needs fw:

?

?

If anyone has these saved somewhere please let me know. I can host them on my website (neonkev.com) for folks in need in the future as well.

?

Thank you!
Re: Copy contents of floppy in 8753 VNA to a PC

 

Is the floppy drive unit in the GPIB interface box, a standard 1.44MB 3.5 inch type? If so, perhaps you can replace it with a floppy drive emulator, that can also be accessed via USB.

(If unfamiliar with this type of device, google "floppy drive emulator")

Eamon Egan?

On Mon., Sep. 12, 2022, 8:41 p.m. tgerbic, <tgerbic@...> wrote:
Too bad they don't support X and an Ethernet port, or alternately a serial terminal port. Not a lot of other options besides a LIF formatted disk and GPIB/HPIB. I know hat some HP gear that supports X and also have a serial port, or support HPIB and have a serial terminal port allow the HPIB commands and data to be sent through the serial port as if it was an HPIB port. I have used this with some of my logic analyzers.

- The analyzer can output in serial. Perhaps capture that in a PC and use a simple BASIC or C program to strip and format the data automatically.
- I don't remember what the data printouts look like but wondering if the printer port could be hooked to a UART and data sent to the PC as serial data. Once at the PC, the data could be converted into a list of text values using a simple program in BASIC or C.? For printing, probably want EPSON mode. This could work if the analyzer does not have a serial printer port.
- I think the printer port can be put in GPIO mode and act like a parallel port. Same idea with a UART as above. Probably need a BASIC program to read the data and push it out the parallel port using the "OUTPUT @Nsomething" command. The BASIC commands are pretty powerful. Don't know if anyone has seriously tried this as it is probably not very obvious.

This has been a problem for a long time and most people end up circling back to using some GPIB adapter and custom GPIB software.

--
T. Gerbic
Central California

Re: unscribe

 

¿ªÔÆÌåÓý

Or simply click the unsubscribe link in the footer of any message from the list.?


On Sep 12, 2022, at 21:45, sniper.asys@... wrote:

?
There's an unsubscribe link at the bottom of every message posted in this group.

On Tue, Sep 13, 2022 at 4:29 AM Jim Allyn - N7JA <jim@...> wrote:
I'm not sure that anyone else can unsubscribe you.? YOU can do that yourself.? Go to the subscription page, scroll to the bottom of the page, and click the red Leave Group button.

Re: unscribe

 

There's an unsubscribe link at the bottom of every message posted in this group.


On Tue, Sep 13, 2022 at 4:29 AM Jim Allyn - N7JA <jim@...> wrote:
I'm not sure that anyone else can unsubscribe you.? YOU can do that yourself.? Go to the subscription page, scroll to the bottom of the page, and click the red Leave Group button.

Re: unscribe

 

I'm not sure that anyone else can unsubscribe you.? YOU can do that yourself.? Go to the subscription page, scroll to the bottom of the page, and click the red Leave Group button.
looking for Kelvin clips for HP 16048C LCR test fixture

 

¿ªÔÆÌåÓý

Hello all,

?

I have an HP 16048C LCR test fixture that, like many, is missing the Kelvin clips.

?

Does anyone have a source for a suitable replacement? Looks like they are obsolete per Keysight.

?

These alligator clips are a little unique in that they plug into rectangular connectors coming off the fixture. The connector housings have a small PCB inside. Each side of the PCB carries one of the two signals for the Kelvin connection.

?

Per the service manual the parts I am looking for are 16036-7511.

?

I¡¯m tempted to hack something together but given the rarity of the fixture I really don¡¯t want to modify the connectors.

?

Thanks in advance for any replies.

Jeff

?
Re: Copy contents of floppy in 8753 VNA to a PC

 

Too bad they don't support X and an Ethernet port, or alternately a serial terminal port. Not a lot of other options besides a LIF formatted disk and GPIB/HPIB. I know hat some HP gear that supports X and also have a serial port, or support HPIB and have a serial terminal port allow the HPIB commands and data to be sent through the serial port as if it was an HPIB port. I have used this with some of my logic analyzers.

- The analyzer can output in serial. Perhaps capture that in a PC and use a simple BASIC or C program to strip and format the data automatically.
- I don't remember what the data printouts look like but wondering if the printer port could be hooked to a UART and data sent to the PC as serial data. Once at the PC, the data could be converted into a list of text values using a simple program in BASIC or C.? For printing, probably want EPSON mode. This could work if the analyzer does not have a serial printer port.
- I think the printer port can be put in GPIO mode and act like a parallel port. Same idea with a UART as above. Probably need a BASIC program to read the data and push it out the parallel port using the "OUTPUT @Nsomething" command. The BASIC commands are pretty powerful. Don't know if anyone has seriously tried this as it is probably not very obvious.

This has been a problem for a long time and most people end up circling back to using some GPIB adapter and custom GPIB software.

--
T. Gerbic
Central California
Re: Suffering from RIFA anxiety!

 

I think this thread should have been named "RIFA Madness" (you know, in homage to the old movie...)
Jeff Kruth
Re: Hp 8590a eeprom problem.

 

Ah, I was about to go look that up.

It's not unheard of for 2816 and 2864 NVRAMs to fail.

-Dave

On 9/12/22 19:50, Glenn Little wrote:
The 1818-3499 is a HP part number.
It also crosses to X2864A manufacture code 10572.
Glenn
On 9/12/2022 5:21 PM, Richard Cook wrote:
I understand, but I'm looking to buy a replacement , the part numbers in the manual are NMOS 65536, also manufacturer 1818-3499, and manufacture code 28480.
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Hp 8590a eeprom problem.

 

¿ªÔÆÌåÓý

The 1818-3499 is a HP part number.
It also crosses to X2864A manufacture code 10572.

Glenn

On 9/12/2022 5:21 PM, Richard Cook wrote:
I understand, but I'm looking to buy a replacement , the part numbers in the manual are NMOS 65536, also manufacturer 1818-3499, and manufacture code 28480.? 

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
Re: Looking for Agilent PNA old FW repo?

 

There may have been "snapshots" taken at several times. Be sure to check any snapshots covering the time when you think the SW was listed. Also, if it was on HP FTP site you might look to see if wayback covered that anytime.

Cheers!

Bruce

Quoting "Kevin A. via groups.io" <kevin424@...>:

The wayback machine saved the page (same one I linked), but the actual firmware files are not saved on the wayback machine from what I can tell.
Re: Looking for Agilent PNA old FW repo?

 

The wayback machine saved the page (same one I linked), but the actual firmware files are not saved on the wayback machine from what I can tell.
Re: HP 5342A Microwave Counter and 5344A Source Synchronizer for sale

 

The HP 5344A has been sold. Thanks for looking.
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