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

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INFINIUM:
I did that and more
https://www.eevblog.com/forum/repair/agilent-infiniium-54853a-dso-won_t-power-on/

johnwb80:
Did you ever figure out how to get it into the higher sample mode(resistor switches)? I have one of these and would be cool to max it out? Could there be one that needs to be removed to make it the higher model?

nctnico:
You can uphack the 54835A to a 54845A. It is in the first post on page 1.

johnwb80:
To goto 54846A (2.25GHz / 8Gs/s) mode. I didn't see that setup for the resistors anywhere.

nctnico:
I tried all combinations (I think) but it seems the 54846A needs different attenuators.

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