Hi,
sorry for stealing the thread, but I'm not sure if I have a real problem...
I bought Keithley 2100 from eBay as faulty, it shows overload for DC voltage measurement at 10V range and lower, if nothing is connected to the meter,
but it shows 0 for 100V and 1000V, as it should, and it shows reasonable values (very close to actual value, I will try to check precision) for 10V and lower ranges if connected to lab power supply.
All self test are OK..
After switching from 100V to 10V range, it's clearly visible how is reading dropping very fast (~ 1 second) from 0 to negative values and eventually reaching overload.
I reckon that behavior for lower ranges is not normal?
Thanks for any suggestions or advises!
Jacob