Products > Test Equipment
Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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JanNousiainen:

--- Quote from: JanNousiainen on August 30, 2017, 10:52:13 pm ---Holy freaking crap!  :o

I followed through this article and did some measurements: http://www.dasarodesigns.com/projects/fixing-an-hp-agilent-54845a-infinium-oscilloscope/

And guess what? In my scope the -3.1V supply shows +0.8V, same as in his scope! So it is probably failed opamp in my scope too!  Could it really be so simple? ^-^

Going to order few LT2726 IC's ASAP...

--- End quote ---

Hmmmmm, also +0.85V regulator output looks funny, Vout is 3.9V. Perhaps good idea to replace that one too, type is LT1086CM. Not sure what the ADJ pin should be at, mine is about +2.5V.
eurofox:
I got finally my scope today.  :-+

Very big surprise when power up, start …. Boot ….. no error …. Pass al tests.  :-DD :-+ :-+ :popcorn:

It was sold “as is” with no warranty, was sold by someone who know nothing about instruments and buy from closing business ….  :horse:

I got one brand new probe with it. Got the original installations disks still sealed.   :bullshit:

After cleaning up it is in a near mint condition, only minor problem I have to replace the legs but this is not a problem.  :wtf:


nctnico:
@eurofox:  Great find :-+ sometimes people can get lucky!
Tony_G:
I've always wondered how HPAK expected the probe ground to connect to the grounding plug given that they have alligator clips on the probes and a socket for the ground....

Anyway, glad to see you scored there - Hopefully Jan does the OpAmp swap and it starts working too.

TonyG
Jwalling:

--- Quote from: eurofox on September 05, 2017, 01:09:32 pm ---I got finally my scope today.  :-+

Very big surprise when power up, start …. Boot ….. no error …. Pass al tests.  :-DD :-+ :-+ :popcorn:

--- End quote ---

Does it pass the calibration as well?
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