开云体育

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chuck Harris
Sent: 14 December 2019 15:45
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8350B w/83590A repair advice

Note that the 8350B has a 3- AA cell nicad battery,
repurposed from the HP-35 calculators. The pack is
on trickle charge whenever the 8350B is turned on,
and after a year, or two of that abuse, spews its
highly caustic guts all over the side of whatever
plugin is in the 8350B at the time.

The electrolyte tends to ruin the GPIB board, and
the plugin's main circuit board.

You might look there.

-Chuck Harris

pa0jme1952@... wrote:

I took a look at the blockdiagram of my 83592, which differs only with an

extra low band mixer,

The sweeper unit is a cascade of
a) YTO o/p 2.4-7.0GHz
b) amplifier
c) isolator
d) YTM (multiplier)
e) YTF
The most probable cause imho is tracking of the 3 YIG devices, at least

that's my experience with the older 86290B which showed the same symptoms.

The tracking is done by opamp controlled current sources and can be caused

by resistor ageing

Unfortunately I gave a few years ago my 83590 manuals away
Best regards Rien

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