J
Joerg
Guest
Hello Folks,
The HP4191A reads erratic, measurement errors are pretty random. No
error codes displayed, passes self-test, calibration runs through
without a problem. The usual displays of HPIB address and option letters
pop up several minutes late. After turn-on the only things that light up
(dimmed) are the LEDs next to the displays, those that signal "milli",
"mega" and so on but the main 7-segment displays remain dark for a while.
The service manual says that the typical cause of this is a power supply
fault. However, after taking it apart all voltages are normal right
after start-up and I could not find any loose cables.
Hoping someone else had that happen and could you give a hint.
Regards, Joerg
http://www.analogconsultants.com
The HP4191A reads erratic, measurement errors are pretty random. No
error codes displayed, passes self-test, calibration runs through
without a problem. The usual displays of HPIB address and option letters
pop up several minutes late. After turn-on the only things that light up
(dimmed) are the LEDs next to the displays, those that signal "milli",
"mega" and so on but the main 7-segment displays remain dark for a while.
The service manual says that the typical cause of this is a power supply
fault. However, after taking it apart all voltages are normal right
after start-up and I could not find any loose cables.
Hoping someone else had that happen and could you give a hint.
Regards, Joerg
http://www.analogconsultants.com