开云体育

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Sergey
Kubushyn
Sent: 15 December 2019 01:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8350B w/83590A repair advice

On Sat, 14 Dec 2019, peter bunge wrote:

Check which unit has the problems.
Best done with a plug-in you can trust. Don't tinker until you know which
is the bad unit.

It is almost certainly the plug-in. 8350B itself is a simple device having
almost no influence on plug-in performance.

Those 8350B plug-ins are very tricky to adjust and calibrate. Their output
is a product of several oscillators and filters that all must be tuned
properly. The most difficult is 83592B (and other wide range devices) LOW
frequency range that is a product of 2 several-GHz oscillators so it is
EXTREMELY sensitive to proper adjustments -- you have one of those very
slightly off and there is no lowest band output at all. Zero. The same is
true for other ranges but sensitivity is much lower so relatively big
misalignment would still produce SOME output.

I spent a week trying to calibrate 83592B and put it aside for a time being
still not fully calibrated. It is very complex device and different settings
all affect each other so you have to re-do calibration multiple times.

I've got two 8340B instruments since that so I lost all interest in 8350B
and its plugins so they are gathering dust right now. I've also got Wiltron
6669B that goes up to 40GHz that works somehow but it is the same kind of
instrument as 8350B, just with everything from all possible plug-ins built
into single instrument so it also begs for proper alignment/calibration. It
works but produces something far from sinewave on the lowest band so it
definitely has to be re-adjusted from scratch.

BTW, if somebody is interested I can list those 2 fully working and
calibrated 8350B mainframes I have as well as fully working fully
refurbished and calibrated 83570A plug-in as well as several different
plug-ins in various refurbisment/adjustment/calibration states and some
partial units for parts as I don't need them anymore and have no time to
waste on them. I do also have printed manuals on almost all of those that I
would also rather get rid of. Haven't done it so far as there are too much
work on my calendar so I'd rather spend time on something else but if
somebody is interested I can make a list and either sell those direct or
list them on EBay.

BTW, there is little sense in putting new batteries in 8350B (although I
did) as they back up RAM that only holds last settings, nothing else. There
are no calibration constants there or something else that might've been of
any importance. It will just power-up in a default state if batteries are
dead or missing, nothing else. All settings are pure mechanical adjustments
that don't require any battery to persist.

---
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