I purchased an Agilent 54832B off the 'Bay that was listed as fully functional ('natch)
but fails the calibration on CH1 (vertical errors, flatness)
I wrote an email to the seller stating:
"Hello,
Unfortunately, this scope does not pass it's built-in calibration routines, it fails on CH1 vertical, flatness. With a 50 Ohm terminator connected to CH1, I can get the scope to trigger over a 800uV range. On Ch2, it will only trigger over a 30uV range which is about right. CH1 is very noisy which I believe is causing the failure.
See the pictures, it was failing in 2015, and still failing now."
The seller wrote back that he's sorry, and how competent his technician is, etc. and has given me permission to break the seals and open the scope to see if I can repair the channel. Given the fault, and before I dive in, has anyone ever had any success repairing this particular problem? I'm hoping it's not the input amp hybrid... but perhaps a noisy OP-AMP or de-coupling cap?
EDIT: added picture.
Thanks.
Jay