Could someone help me identify faults at HP 34970A unit which I bought via online auction.
First I thought that all errors are caused by leaking battery but the new battery didn’t help.
The unit shows errors 740, 741, 747, 748 after a self-test run.
Another detected faults:
- after switching on (push the on/off button only, the unit is plugged all the time)the unit can‘t remember a communication HPIB or RS232 setting, it’s back in default/factory setting; once I set up again communication RS232 is working (tested), I’m not able to checkHPIB status.
- UTILITY setup:
- the unit remembers the time and date settings
- CAL SECURED changes to UNSECURED after switching off
- PWR ON RESET changes to LAST after a few time switching off
- I get error 741 by change DMM ENABLED – DISABLE
It looks like when I adjust the equipment it’s working fine until the switching off. As per my understanding (and tips on web) the 740 serie errors are mostly caused by a defective FRAM (U450, U201). Or might be there an another problem? Many thanks !