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HP 54835A scope Calibration failure.
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magnetchief:
Hi guys, having an issue with an HP 54835A scope.
The HDD had failed and the back light was very dim.
Replaced the drive with a preformatted image of a later version.
Replaced both backlights.
Scope seems to be working well, all 4 channels are fine.
I can input an AC signal and it displays as I would expect.
It passes all the self tests.
But will not pass the calibration tests.
I am using a 30cm cable for the tests.
Measured the DC output voltage from the aux port. It reads apx 800mv. Never changes even during the cal test. Even when changing the level -2.5 to +2.5 just stays at + .8v
Any advice appreciated.
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