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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack

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TheSteve:

--- Quote from: Tony_G on September 05, 2017, 02:39:00 pm ---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

--- End quote ---

The probe ground is actually very easy to clip too. It isn't a regular banana socket.

Jwalling:

--- Quote from: TheSteve on September 05, 2017, 04:23:53 pm ---
--- Quote from: Tony_G on September 05, 2017, 02:39:00 pm ---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

--- End quote ---

The probe ground is actually very easy to clip too. It isn't a regular banana socket.

--- End quote ---

And you can always clip it to the AUX out BNC shell anyway...

Howardlong:
A quick glance of the service manual suggests that the attenuators are a different part number for the 54846a. Are there any thoughts on the hackability up to this version? There was some mention of an extra resistor, R4, somewhere on the acquisition board, but I fear there may be more to it.

eurofox:

--- Quote from: Jwalling on September 05, 2017, 03:35:02 pm ---
--- 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?

--- End quote ---

Yep, just finish it.  :popcorn:

Tony_G:

--- Quote from: TheSteve on September 05, 2017, 04:23:53 pm ---The probe ground is actually very easy to clip too. It isn't a regular banana socket.

--- End quote ---

Hmm, my clips always seem to slip off at the slightest movement. I'll have to take a close look at the socket.

TonyG

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