Am 09.09.2022 um 08:27 schrieb Sven Schnelle:

Thanks, but i already ordered a HxC emulator to replace the floppy
drive. I don't even know whether the floppy drive does even work. Were

Is this one of the Sony MP-F52W drives too? I (now) know how to emulate them properly with a Gotek hardware, FlashFloppy software and HFE file. Had to dig a little bit to get all pieces working, the disk change reset is a little tricky (and does not work on all versions of Gotek hardware).

Bernd

I reflowed the pins yesterday on U21 but the error message didn't come up till after 30 mins of operation. . I have read that one guy didn't get the same error code till he did amplitude cal. I also did another cal yesterday . Maybe I need exactly what I do and when it rears its ugly head again. I'm beginning to suspect something other than EEPROM issue. What do you all think ??

开云体育

The 11-digit number is the federal stock number (a predecessor to the NSN; insert "00" between the first and second groups of digits to form the corresponding NSN). Looking it up leads, among other places, to:



Perhaps that will lead to more of what you're looking for.

-- Cheers,
Tom

-- 
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070

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Am 09.09.2022 um 01:55 schrieb Jared Cabot via groups.io:

I have a spare boot floppy for the 4145A, can make a copy on a new floppy disk for the 4145B, and have a set of Agilent floppies in a sealed box for the 4155B/4156B (Kit# 04155-85022, containing P/N: 04155-17001, 04155-17004, 04155-17401, and E5250-17001)

I'm able to take images of these disks if you like (not the 4145A disk yet, still working on getting the 5.25 floppy drive operational) and email them, or sell the physical disks for the cost of shipping plus what I paid for them (a nominal amount).

Would be nice if you can upload those images to one of the usual sites (KO4BB?) For the 4145B disks already are at KO4BB.


Bernd

"Jared Cabot via groups.io" <jaredcabot@...>
writes:

I have a spare boot floppy for the 4145A, can make a copy on a new
floppy disk for the 4145B, and have a set of Agilent
floppies in a sealed box for the 4155B/4156B (Kit# 04155-85022,
containing P/N: 04155-17001, 04155-17004, 04155-17401,
and E5250-17001)

I'm able to take images of these disks if you like (not the 4145A disk
yet, still working on getting the 5.25 floppy
drive operational) and email them, or sell the physical disks for the
cost of shipping plus what I paid for them (a
nominal amount).

Thanks, but i already ordered a HxC emulator to replace the floppy
drive. I don't even know whether the floppy drive does even work. Were
are you located? I guess if it's US shipping to EU is likely as much as
the HxC ;-)

Regarding the image itself, couldn't you just convert the HxC emulator
images that are out there?

"Jared Cabot via groups.io" <jaredcabot@...>
writes:

On Fri, Sep 9, 2022 at 05:40 AM, Sergey Kubushyn wrote:

Most common failure in 1345 is one (or more) of the trimpots lost
connection in one of terminals. Those small Bourns round trimpots are a real
disaster. I had at least a couple of dozens of those replaced in all kinds of
HP and Tektronix gear and that was the only parts failed. That included 3 or
so 1345 displays.

I found the same in the 1345 displays in both my 4145A and 4145B, more
than one of those little Bourns 3329-series
trimpots were problematic.

The interesting thing was that it wasn't even noticable when turning the
pot. It was just open when the unit was cold, and after it warmed up,
everything was fine. I just suspected the pot because during after some
warmup time the width of the picture changed in a 'flickering' way until
it finally worked ok.

Hi

I'm trying to read the list of stepped frequency points for the current
(corrected) trace on an HP 8510C via HP-IB. I *think* OUTPFREL is
supposed to accomplish this, but I see the message:

CAUTION: REQUESTED DATA NOT CURRENTLY AVAILABLE

The manual says this about that error message:

You tried to input/output raw data arrays that were not available due to
the calibration type, or tried to input calibration coefficients without
selecting the proper calibration type (see INPURAW, OUTPRAW), or tried
to output a memory trace without turning on memory.

Only the last option there seems like it could be applicable. What does
"tried to output a memory trace without turning on memory" mean?

FYI I'm able to read out the corrected trace data just fine with
OUTPDATA (I've set the format to ASCII = FORM4).

How can I read out the frequency stimulus points?

Thanks in advance,
Matt

Hi Marco,
The scope bezel does come off, but because of age the plastic will have become brittle, so you do have to be careful. There are two tabs on the bezel which lock it into a metal surround on the front panel.?
These tabs are hidden but are located, one on the top and the other on the bottom in the center of the bezel. If you use your thumb and middle finger of one hand to grip the top corners of the bezel, ready to pull it forward when the top tab is released, then with your other thumb press down on the center of the bezel near the rear edge. This should release the top part of the bezel from the instrument.

As for the board it is small enough to be sent in a letter so the postage should not be expensive. This is just a blank board, no parts included. The seven segment displays I used are available from RS Components, E14/Farnell, Digikey, and Mouser.
As for the right-angle header the pins are longer those currently available, so I just reused the one from the original display board.

Let me know you mailing address and I'll send the board.

Regards,
Peter

Does anyone have access to service information and/or schematics for any of these microwave sources and down-converters?
As far as I can tell HP/Agilent never released any service info on any of these fine instruments. Thank you.

On Fri, Sep 9, 2022 at 05:40 AM, Sergey Kubushyn wrote:

Most common failure in 1345 is one (or more) of the trimpots lost connection
in one of terminals. Those small Bourns round trimpots are a real disaster.
I had at least a couple of dozens of those replaced in all kinds of HP and
Tektronix gear and that was the only parts failed. That included 3 or so
1345 displays.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*

I found the same in the 1345 displays in both my 4145A and 4145B, more than one of those little Bourns 3329-series trimpots were problematic.

Jared

I have a spare boot floppy for the 4145A, can make a copy on a new floppy disk for the 4145B, and have a set of Agilent floppies in a sealed box for the 4155B/4156B (Kit# 04155-85022, containing P/N: 04155-17001, 04155-17004, 04155-17401, and E5250-17001)

I'm able to take images of these disks if you like (not the 4145A disk yet, still working on getting the 5.25 floppy drive operational) and email them, or sell the physical disks for the cost of shipping plus what I paid for them (a nominal amount).


Regards,
Jared

On Thu, 8 Sep 2022, Sven Schnelle wrote:

"Sven Schnelle" <svens@...> writes:

The HP4145A + B are likely easy repairs, on one the 1345 XY display
sometimes only shows a vertical line, pointing to a problem in the X
deflection. The X/Y outputs at the back of the unit are showing the
proper signal. The tube isn't getting any signal, so it must be the
output amplifier.

Might be just the gain pot - it says 1k, but i measure 1.6k. I put a
fixed 270Ohm resistor now because i don't have the right pot, lets see
whether that helps. Crossing fingers...

Most common failure in 1345 is one (or more) of the trimpots lost connection
in one of terminals. Those small Bourns round trimpots are a real disaster.
I had at least a couple of dozens of those replaced in all kinds of HP and
Tektronix gear and that was the only parts failed. That included 3 or so
1345 displays.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*

"Sven Schnelle" <svens@...> writes:

The HP4145A + B are likely easy repairs, on one the 1345 XY display
sometimes only shows a vertical line, pointing to a problem in the X
deflection. The X/Y outputs at the back of the unit are showing the
proper signal. The tube isn't getting any signal, so it must be the
output amplifier.

Might be just the gain pot - it says 1k, but i measure 1.6k. I put a
fixed 270Ohm resistor now because i don't have the right pot, lets see
whether that helps. Crossing fingers...

/Sven

Hi List,

i couldn't resist and bought a lot of HP Semiconductor Analyzers.
In particular:

HP4145A
HP4145B
HP4155B
HP4156A

The HP4145A + B are likely easy repairs, on one the 1345 XY display
sometimes only shows a vertical line, pointing to a problem in the X
deflection. The X/Y outputs at the back of the unit are showing the
proper signal. The tube isn't getting any signal, so it must be the
output amplifier.

The other one is missing the boot floppy. Everything else seems to work,
i confirmed this by taking the HxC emulator which is already present in
the other unit to boot. So i'll likely remove the floppy drive and just
put in a HxC emulator and be done. Although i don't need two analyzers,
i mainly bought them to make sure i have one if i need some unobtainable
parts.

The HP4155/56 seem to be a bit more problematic - both have broken power
supplies. One is not starting at all, the other one is starting for a
second and shuts down afterwards.

I haven't found a schematic/service guide for them - does anyone know
any details about the power supplies? One is a Voltex D2160, the other
one i don't know yet. But they look quite sophisticated, with a lot of
different voltages and several PCBs.

Thanks
Sven

"Sven Schnelle" <svens@...> writes:

So if the YTM current is not parked correctly the YIG sphere will interfere with the Band 0 passband. This should be
fairly straightforward to check by measuring the coil voltage around 4GHz and confirming it parks at a similar location
when a Band 0 frequency is selected.

I think i measured ~2.3V above the coil, but don't know what the voltage
required to tune it to 4GHz is. I'll check this evening, thanks!

A mismatched YTF interfering would also explain why the dip is at ~2.2Ghz,
and after that the output level increases again...

I did another test now: unsolder the tuning coils from the PCB and
connect it to voltage source. Moving current from 0 to 50mA (i think
i've read 15mA/GHz in the Service manual) didn't change the level
of the output. I've found the SYTM now used and ordered two. Lets
see whether at least one of them works. If it works, i'm selling
the other one - guess i'll find someone who needs one.

/Sven

"Bruce" <bruce@...> writes:

I'd toa bit more investigation:
1) Test YIG output (rar of 8340)
2) Test input to the YTM from the low band amp

Things to suspect: Low band AMP, heterodyne mixer and 3.8GHz oscillator.
SRD is not involved in band 0 - PIN switch is involved in band 0

I think i checked both a while ago, but will check again this evening. Thanks!