Hi,
I never used a Forum before, as there are always more experienced persons giving advice and I don't only want to ask for help. Nevertheless, I thought i'll give it a try, as I really need help and maybe someone else can profit from this problem some time later.
So here is my problem:
I work at a University and we use a Keithley 6485 for measuring ioncurrents. Unfortunatelly, it started showing "OVRVOLT" on almost all ranges (not on the µA range, but this already showed rubbish before). Input to GND shows 0V. As I am not the only one using this device, I can't tell what happened to it, but worste case is 5kV from a charged up sample holder (no Idea what the capacity of that thing is, quite little probably).
I tried exchanging the LMC662 and the LMC6081 more like as a quick and dirty approach, as this would not have been the first time this exchange was needed.
I would be glad if you had some suggestions how to approach this problem, as i am not an electronics expert and i don't see where a good starting point would be.