On 5/27/22 20:03, Matt Huszagh wrote: I'm not really sure where to send this, but I figured some people on
this list might have an idea.
I sent an email to curator@... a few months ago to get access
to some software on their site. I never heard back. I reached out again
just now and received a response that my email had been blocked as junk
mail. I actually don't need the software anymore - found it on the
terrific hp-series300.net, but I'm concerned that my emails are being
flagged. Has anyone experienced this?
There was nothing suspicious about my original email or the follow-up. I
also don't use a graphical email client, so there are no funny images or
attachments in the email; just plain text. This is the blocked response
I got back.
** Message blocked **
Your message to curator@... has been blocked. See technical details below for more information.
The response from the remote server was:
550 "JunkMail rejected - mail-pj1-f53.google.com [209.85.216.53]:42889 is in an RBL: " David Collins is currently the curator of hpmuseum.net. He's on the VintHPCom mailing list; if you post there he'll see it. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
I'm not really sure where to send this, but I figured some people on
this list might have an idea.
I sent an email to curator@... a few months ago to get access
to some software on their site. I never heard back. I reached out again
just now and received a response that my email had been blocked as junk
mail. I actually don't need the software anymore - found it on the
terrific hp-series300.net, but I'm concerned that my emails are being
flagged. Has anyone experienced this?
There was nothing suspicious about my original email or the follow-up. I
also don't use a graphical email client, so there are no funny images or
attachments in the email; just plain text. This is the blocked response
I got back.
** Message blocked **
Your message to curator@... has been blocked. See technical details below for more information.
The response from the remote server was:
550 "JunkMail rejected - mail-pj1-f53.google.com [209.85.216.53]:42889 is in an RBL: "
Matt
|
Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable
I realized a couple of hours after sending the initial post, that I was incorrect with associating Calibration with the Port Extensions.
Here is, I hope a better explanation of what I am trying to do.
First off the measurement frequency is 14 MHz.? So not too beyond the capability of the 8753C.
I want to place the measurement plane at the end of a 100 foot length of RG213.? So I place the SOL standards, one at a time at the
end of the cable.? Supposedly the 8753C measurement plane is now at the end of the cable.
Now I can take S11 measurements relative to the measurement plane at the end of the cable.? My question should have been
" Is there a limit in terms of how long a cable can be before this calibration technique fails."
This is probably related to the storage of the cal correction factors in the memory of the 8753C.? Is it via floating point numbers, or integer numbers?
How large or small can the calibration correction values be???
I seem to be able to obtain valid data using this technique, but wanted to ask on the Keysight forum with some of the folks who actually designed
the instrument.? I think Dr. Joel it still active there.?
My rant about not being able to login to the Keysight forums still exists.? It seems their login/validation screen seems broken.
At one time I had an account over there but they have seemed to have changed the supporting vendor for the forum sites.
As always,
Regards,
Karin Johnson
|
Re: LCD replacement for vector displays
On Fri, May 27, 2022 at 2:56 PM Bill Higdon via <willard561= [email protected]> wrote: This might open up up some possibilities for some of the vector display instruments
This appears to go in the other direction, e.g. it allows using games emulated with a custom version of the MAME arcade emulator to be displayed on an authentic old-style vector monitor._._,_._,_
|
Running HP-UX 9 remotely from a Linux host
Hello,
I have an HP 382 that I use to control an HP 3048A system. Currently, I
have a disk image containing an HP BASIC 6.3 installation that I serve
to the 382 with HPDrive. This works, but there are two main pain points:
1. Transferring files between the 382 and my modern Linux machine is
cumbersome. HPDir allows me to extract files from a disk image
containing an LIF filesystem. However, my disk image is formatted for
HFS. I could also serve an LIF-formatted drive and copy between them,
but still this is a bit painful (I won't go into the details, but happy
to explain further if someone wants).
2. Using my 382 system requires pulling out a VGA monitor and keyboard
that I only use for this purpose. I'd much prefer to run everything from
my Linux machine.
I expect that if I used HP-UX 9 instead of HP BASIC I could easily
resolve the first problem. HP-UX supports FTP that should make file
transfer over a network simple.
I'm curious about using HP VUE to also resolve the second annoyance. HP
VUE targets the X window system and allows remote connection over a
network. So, in principle this is simple, but with the 30 year time
gap between an implementation of the X window system for HP-UX 9 and the
one running on my current Linux machine, I expect there will be a few
challenges to sort out.
There's an old forum thread that goes into some of the difficulties that
arise. See
and linked threads.
Does anyone use this workflow or something similar? If so, would you be
able to provide any pointers about getting it running? I'm going to
investigate this myself either way, but if someone has already addressed
some of the challenges that pop up, I'd prefer not to duplicate the
troubleshooting time.
Thanks!
Matt
|
LCD replacement for vector displays
This might open up up some possibilities for some of the vector display instruments
https://hackaday.com/2022/05/26/color-vector-display-controller-brings-arcade-classics-back-to-life/
|
Re: checking line module setting for 110V / 220V
I used a little hook like the ones you can buy at a hardware store and glued it into a small plastic rod
?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]>
On Behalf Of ??????? ????? via groups.io
Sent: Friday, May 27, 2022 1:29 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] checking line module setting for 110V / 220V
?
there is small hole on card
use a hook and pull, swinging the card from side to side
There is no locking except fuse lever
|
Re: checking line module setting for 110V / 220V
Most of my (many) items of HP gear arrived in the UK from the USA so
I've met this issue a few times, what I do is:
Check that nothing is bent/twisted, take a pair of thin(ish) nosed
pliers - with serrated jaws - grasp the back edge of board in the
centre and with a silent prayer to the Gods of Incredibly Thin PCBs
pull straight and firmly and out it will come!
Adrian
On 27/05/2022 19:19, tom_iphi via
groups.io wrote:
toggle quoted message
Show quoted text
Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting
it to mains and powering it up.
The line module seems pretty much standard across the HP equipment
of that age.
A lever next to the mains socket removes the fuse. Below the lever
there is a little pcb plug that allows to change the voltage
setting.
Is there a trick to remove that card? It seems to be stuck. Is
there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
Re: checking line module setting for 110V / 220V
Tom,
Give it a tug - they’re in there pretty tight! I just pulled one to be sure and unless someone has damaged something it should pull straight out.? Steve K.
toggle quoted message
Show quoted text
On May 27, 2022, at 1:20 PM, tom_iphi via groups.io <iphi@...> wrote:
?Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting it to mains and powering it up.
The line module seems pretty much standard across the HP equipment of that age.
A lever next to the mains socket removes the fuse. Below the lever there is a little pcb plug that allows to change the voltage setting.
Is there a trick to remove that card? It seems to be stuck. Is there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
Re: checking line module setting for 110V / 220V
there is small hole on card use a hook and pull, swinging the card from side to side There is no locking except fuse lever
|
Re: checking line module setting for 110V / 220V
As I recall, there should be a little hole in the small PC Board. Hook it with a Small Screwdriver or anything else you can hook it with, and pull. Regards Bill Lauchlan ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of tom_iphi via groups.io
Sent: Friday, May 27, 2022 2:20 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] checking line module setting for 110V / 220V? Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting it to mains and powering it up.
The line module seems pretty much standard across the HP equipment of that age.
A lever next to the mains socket removes the fuse. Below the lever there is a little pcb plug that allows to change the voltage setting.
Is there a trick to remove that card? It seems to be stuck. Is there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
checking line module setting for 110V / 220V
Hi folks,
mayby I'm stupid, but I need guidance.
I want to make sure my HP85101 is set for 220V before connecting it to mains and powering it up.
The line module seems pretty much standard across the HP equipment of that age.
A lever next to the mains socket removes the fuse. Below the lever there is a little pcb plug that allows to change the voltage setting.
Is there a trick to remove that card? It seems to be stuck. Is there a locking mechanism or do I just not pull hard enough?
I don't want to break anything.
Thanks, Tom
|
Re: 8662A - a warning about dangerous service directions
Hi George,
toggle quoted message
Show quoted text
On Fri, May 27, 2022 at 05:04 AM, george edmonds wrote:
Hi Dmitry
?
Whilst I share your concerns may I say that the HP fault finding guidance is based around having a set of their 8622A or 8623A PCB card extenders available.Under most circumstances using the card extenders will leave the power supply loads in place and limit the extent to which the voltages can rise.
This is not an issue with the loads being disconnected. When the overvoltage condition exists, HP advice is to bypass the safety shutdown and measure the voltages. With the normal loads in place, peak excursions were sufficient to damage multiple components in the -40 V regulator. Trusting the service manual in this case was clearly wrong.
?
?
The biggest problem that I see with most SMPSU repairs is a lack of understanding as to how they work and the limitations placed on their control circuitry.? I would suggest reading the excellent posting by Dave G8KBV in the previous 8622A repair thread, the key point is only one voltage control loop.
I know fairly well how 8662A switching supply works, not my first time fixing one. First time I ran into the high voltage shutdown, though. If the service manual was silent on the issue, I'd figure out a way to capture the transients, just like I suggested in the original post. But I tend to trust the service manual troubleshooting guidance. It did feel wrong to bypass the shut-off, but if HP says "do it", you do it. At least the first time :)
|
Re: Info Need on a RF FET for a Agilent E4438C signal generator
I used this one for a similar job, worked fine, didn't need to modify the matching networks,
You won't get 20dB gain out of it but perhaps you can get along with less... Don't ask me where you can get this critter from, nowadays...
|
Re: 8662A - a warning about dangerous service directions
Hi Dmitry
?
Whilst I share your concerns may I say that the HP fault finding guidance is based around having a set of their 8622A or 8623A PCB card extenders available.? Under most circumstances using the card extenders will leave the power supply loads in place and limit the extent to which the voltages can rise.
?
The biggest problem that I see with most SMPSU repairs is a lack of understanding as to how they work and the limitations placed on their control circuitry.? I would suggest reading the excellent posting by Dave G8KBV in the previous 8622A repair thread, the key point is only one voltage control loop.
?
G Edmonds.
|
Re: first post - new home lab - tips on using HP/Agilent gear
I replace the 75 ohm resistors that are in series with the output connectors with 50 ohm. The Inputs on the amps that I convert are high impedance, with loop through so I can easily configure a unit for a single input and up to 64 outputs. Or I can feed other frequencies through each of the eight plug in 350 MHz video amplifiers.
I also have some remote controlled video routers to select which output goes where. These were pulled from a commercial TV station when it was moved to a new site and converted to HD.
On Tue, May 24, 2022 at 11:58 AM, Mark Bielman wrote:
Samudra,
I did this with a KTS-250 (the smaller version, setup as 1 input x 8 outputs) and I changed everything to 50 Ohms... works great. Not sure you need to though.
Have the schematic somewhere in my stash. Not much to it. I think the resistors are in a SIP so I used the DIY method instead of buying some.
I would NOT recommend connecting all the inputs together as that would load the GPSDO too much. If you need more than 8 references, better to:
Feed GPSDO output to KTS input. Use 1 of the 8 KTS outputs and connect to another KTS input. Etc, etc. Then each KTS group will have 7 reference outputs except the last one will have 8.
Follow that?
Have fun!
Mark
Interesting.- thank you Mark. I don't mind DIY, if I had a schematic. I would appreciate a suggestion if we can convert it 50 ohm distribution. That's a resistor network at the end of the signal path or so, per the youtube video tear down I think. But if 75/50 ohm in such a small signal chain is not really critical for distributing 10 MHz, to a short few runs of BNC cable - then all the better. Yes, I did get the tip to use two stages for distribution of the 10 MHz ref clock.?
The GPSDO device is s a Chinese clone of PLL-GPSDO BG7TBL. Just arrived and waiting for it to warm up with the antenna outside my window. The output is noted as "SINE WAVE,6dBm+-2dB", so that's fairly hefty and wondering if this is useful or do we need to attenuate it for a cleaner signal? I'll hook up an oscilloscope shortly to see the 10 MHz carrier.?
Do HP equipment mind a sine-wave and not a square wave? Haven't read the big manuals yet in detail :-)?
|
Re: 8662A - a warning about dangerous service directions
Dmitry,
It always puzzled me that the manual advised you to bypass the over-voltage protection shutdown in the situation of a potentially damaging over-voltage condition. Seems to me that is only asking for trouble. I went down the route of disconnecting P2 and then capturing the unregulated turn-on transients as you?suggested. That helped me to identify a problem with the -40V line (or rather a problem with the way I was loading it during testing.?
regards
Tony
On Fri, 27 May 2022 at 08:48, Dmitry Teytelman < dimtey@...> wrote: Hello,
During a recent repair my 8662A went into shutdown due to the high
input voltage at the linear regulator (A7A1) input. Service sheet 56
directs one to ground the collector of A7A1Q16 and then measure
voltages on test points TP4, TP5, TP6. Well, if a true overvoltage
condition exists on the -40 V regulator input, that ends up blowing a
bunch of parts, since the absolute maximum voltage rating on A7A1U1 is
50 V. I lost R37, U1, Q1, and Q5 on A7A1.
I think two different approaches would work better:
1. Capture the turn-on transients on the unregulated supplies (-45 V,
23 V, -13 V) and the regulated -5.2 V supply with a scope.
2. Disconnect P2 from the power supply motherboard, remove A7A1
completely, then load the four above mentioned supplies with power
resistors (1 A for -5.2/-13/+23 V, 0.5 A for -40 V). Signals ON and
HI-V on the power supply motherboard must be grounded. Now supply
voltages can be safely examined without worrying about damaging A7A1
or the rest of the synthesizer.
Regards,
--
Dmitry Teytelman <dimtey@...>
|
8662A - a warning about dangerous service directions
Hello,
During a recent repair my 8662A went into shutdown due to the high
input voltage at the linear regulator (A7A1) input. Service sheet 56
directs one to ground the collector of A7A1Q16 and then measure
voltages on test points TP4, TP5, TP6. Well, if a true overvoltage
condition exists on the -40 V regulator input, that ends up blowing a
bunch of parts, since the absolute maximum voltage rating on A7A1U1 is
50 V. I lost R37, U1, Q1, and Q5 on A7A1.
I think two different approaches would work better:
1. Capture the turn-on transients on the unregulated supplies (-45 V,
23 V, -13 V) and the regulated -5.2 V supply with a scope.
2. Disconnect P2 from the power supply motherboard, remove A7A1
completely, then load the four above mentioned supplies with power
resistors (1 A for -5.2/-13/+23 V, 0.5 A for -40 V). Signals ON and
HI-V on the power supply motherboard must be grounded. Now supply
voltages can be safely examined without worrying about damaging A7A1
or the rest of the synthesizer.
Regards,
--
Dmitry Teytelman <dimtey@...>
|
Re: WTB: 5265A Digital Voltmeter for HP 5245L Electronic Counter.
Hi Stephen, do you still have the 5265A for sale? im in Australia, thanks Ben
|
Re: HP/Agilent/Keysight 8478B thermistor mount
Yes 8478B is a transfer power standard for 7mm connectors . It’s very stable , the matching is not the best but with a good VNA are used as transfer standard on most national lab. The efficiency are measured on microcalorimeter with extreme accuracy close to as remember .1% Ing. Patricio A. GrecoTaller Aeronáutico de Reparación 1B-349Organización de Mantenimiento Aeronáutico de la Defensa OMAD-001Gral. Martín Rodríguez 2159San Miguel (1663)Buenos AiresT:?+5411-4455-2557F:?+5411-4032-0072
toggle quoted message
Show quoted text
On 26 May 2022, at 18:54, Lothar baier <Lothar@...> wrote:
? I haven’t seen any 8478B used as transfer standard ?, we used them with some special option to calibrate the 50MHz reference on 43x series meters , for sensor calibration we used a weinschel system2 , Yes NIST - if you can afford it - ?will calibrate any sensors that are using a self nulling bridge circuit which certainly includes the 8478B as well as the weinschel sensors -----Original Message-----From: [email protected] <[email protected]> On Behalf Of Dave McGuire via groups.ioSent: Thursday, May 26, 2022 3:31 PMTo: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] HP/Agilent/Keysight 8478B thermistor mountOn 5/26/22 16:10, Lothar baier wrote:i wouldnt call it a transfer standard , weinschel/tegam makes sensors
that use the same principle that are heated (1109/1111)? that are used
with system 2 units to calibrate sensors , they are outrageously
expensive
??They certainly can be, and certainly are, used as transfer standards. ?Further, NIST will calibrate them. (they won't calibrate any other type of RF power sensor, unless something has changed very recently) ???????????-Dave--Dave McGuire, AK4HZNew Kensington, PA
|
Dave McGuire
Dmitry Teytelman
Michael A. Terrell
Patricio A. Greco