Sorry for asking many (maybe stupid) questions.
But I need to understand your problem, your so far testings & results and the available equipment for a sufficiant remote support.
Do you have
- a multimeter?
(I bet you have just want to be sure about)
- an oscilloscope (2 ch)?
(I bet you have just want to be sure about)
- an electronic DC load?
(would help verify some points like the limtit settings)
- the 6624A S&M manual?
(would help as a reference for further guidance)
If ch1 (40W LowVolt) is the problem
- so ch2 (40W LowVolt) works correct (including OVP, OCP and current limits)?
(you have acces to a working reference)
- if you changing the serial connection to the GPIB between ch1 and ch2 the problem remains at ch1 (ch2 still operates as specified)?
(so no issue with the GPIB board, just to concentrate on the ch1 board)
- supply voltages at ch1 are all within the specified limits and don't have high ripply?
(no site effect of a supply issue)
- all test points and refence voltages at ch1 are all within the specified limits and don't have high ripply?
(no site effect of a reference issue)
I have a gpib interface fyi
Is my understaning correct: you have the equipment to remote control the 6624A via the GPIB interface
(all testings can & should be done using the front panel controls, except the final GPIB command processing tests)
BR
PeLuLe