Products > Test Equipment
Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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TheSteve:
Well no flicker recently, may have been a bad connection to one of the backlite tubes. I have reassembled the unit for now and given it a quick cleaning. There is one screw barely holding the front controls in. I will have to order some longer screws.
Most of the encoders are behaving now but one or two need further cleaning. I tried out a 1152A 2.5 GHz active probe and it calibrates fine on each channel. I will have to find a way to upgrade the software - this MB has no USB. And I don't have any spare magneto optical media floating around. It was nice to find the original Win98 license and restore media in the top pouch - that has gotta be quite uncommon.

I am trying out 8 GS/s mode, here is a 1.5 GHz 1 Vpp signal. If I go higher in frequency the attenuation isn't too bad but before 1.6 GHz triggering stops.

edit - took a while but I finally found the proper length M3x0.5 26mm screws in my collection (20 year old radio control parts). Also found some screws to use on the case so the scope is no longer missing any screws. The rotary encoders were also cleaned a second time and seem pretty good now.
nctnico:
Dang! I wish I bought that one! I guess the previous owner didn't had any knowledge about PCs and started pulling cables.
Does it also pass it's self calibration?
TheSteve:

--- Quote from: nctnico on August 06, 2017, 07:36:36 am ---Dang! I wish I bought that one! I guess the previous owner didn't had any knowledge about PCs and started pulling cables.
Does it also pass it's self calibration?

--- End quote ---

Yes, self test and self calibration both pass. So far I am very impressed, I have less then $290 USD into it including the shipping.
Guess I can't complain too much that it only had 3 feet. For the moment it has the two front feet installed.

Amazing how much hardware is in it compared to my MSOX3000T series scope...
nctnico:

--- Quote from: TheSteve on August 06, 2017, 07:41:48 am ---
--- Quote from: nctnico on August 06, 2017, 07:36:36 am ---Dang! I wish I bought that one! I guess the previous owner didn't had any knowledge about PCs and started pulling cables.
Does it also pass it's self calibration?

--- End quote ---
Yes, self test and self calibration both pass. So far I am very impressed, I have less then $290 USD into it including the shipping.

--- End quote ---
Oh, yes please RUB IT IN!  ;)
TheSteve:
Here are a couple shots showing SWR (return loss) of the input. I don't know if this would change at all if the scope was rejumpered to a 54846A etc. It is interested to note it uses 4 different ranges, the MSOX3000 series uses only two.

20mV/div
50mV/div
200mV/div
500mV/div



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