Hello everybody,
I have an Tektronix 2465A , Serial number B 033501. After power up the on screen display shows a
ALL 00 PASS .
Presing A/B trigger leaves this screen and the 4 traces forthe 4 channels appear. I have a service manual. Well, I suspect a problem with the controller board, but I am not shure.
Using an external xtal controlled TG501 or similar: Errorneous behaviour shows up when I use the cursor-guided time measurement: It works correct until 20 us/div. But for sweep speed 10 us/div and faster: Deviation ist more than 20%.. That means, even if I use a constant 10kHz or 20 kHz as an input, measurement is correct with the 20us/div setting. Using a 10us/Div setting and readjusting the cursors, it's approx. 20% wrong.
Has anyone seen this before? Or a good point to start the repair procedure?
Svc. Manual doesn't give me a good clue. This error message does not show up.
Andreas