Fluke 89 IV:
Last time it was successfully used, it was used to check 3~ capacitors and voltage.
Some days later it was to be used to measure some resistance.
But it shows 0.00 ohm, it beeps when switching to beep mode. It should read OL, before start.
Switching to voltage gves 0.00.
Althoug at times, it might rush around displaying any number, both it resistance and voltage mode. But for the most 0.00 and it does not matter what the test leads do. Open, connected to something or shorted.
Fuses are checked, batteries changed. Still the same.
So it seems like something in the input stage might have a break / gap.
Tested with a different ohm-meter, by setting one test lead in the input-socket, and followed the pcb. I got a reading in front or after all the components it seems. Nowhere there was OL, it varied from few ohm to a lot of ohms. Don't know if its a lead...
Anyone have any idea of which component to investigate more or try to change??
There are pictures of the 89 PCB on google and this site.