Previously in the TEA forum:
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg2995954/#msg2995954This is a little teardown of the Fluke 750A. I took it first, because there was some disturbing rattling noise coming from the inside.
Front, looks nice and clean:
The battery case is also clean:
Top view, and looking for the source of the noise:
This debris is causing the noise:
Some nice wirewound resistors on top of an oil-filled resistor bank:
No sign of leakage:
The note next to the bank:
A PCB with a relay (I think) on the right side (instrument is upside down):
Some very nice wire wound resistors:
Rusty parts!
Switches and resistors for the fine adjustment of the reference source (1.018V):
Output voltage switch. Here is the debris coming from:
Actually, I have no idea how to repair that thing.
If you have some suggestions, I'd be glad to hear them. Thanks.