Dear forum members,
I need your help in calibrating 2445A o-scope after it was repaired
(re-capped). Currently it says FAIL04 (bad SRAM content). I have the
TG501 time mark generator (2 ns option is broken however) and HP 8175A
AW programmable generator. I'd like to perform the calibration in steps
and therefore here is my first question.
When having FAIL04 is it possible to do the CALxx steps one by one? I
would like to start from CAL01 and then store its settings and then
switch off the scope and bring it into another place for the vertical
calibration. Is it possible?
The service manual is sometimes very confusing. When I was doing the
first round of steps on CALxx I still don't know if I did it right. In
the first step of CAL01 the manual tells to do the superimpose and
matching of the B-sweep delayed marks over the 6th graticule (screen
center). However for all the other steps nothing is mentioned. I have
assumed that when aligning the B-sweep (zoomed) marks I have to join
them on the vertical axis in the screen center with the precision of 1.2
or 0.2 graticule. Is this correct or not at all?
Also initially since the gain x1 and x10 were not set correctly the time
marks would not align with the graticules. So, I had to run the CAL01
calibration a few times.
I'll try to upload the images, but somehow whatever I try to do online
on groups.io doesn't seem to work.
Thank you for your help,
All the Best,
Maxim
