Fluke 45- no negative DC measurements above 3V

[David Aurora]

Might be a while before I get a chance to dive in and troubleshoot properly so just thought I'd check if someone has come across the same problem before and can save me the effort.

I got shafted on a Fluke 45 on eBay recently and at first thought the damage was just cosmetic as things appeared to work OK at first. Fast forward a couple weeks and I'm measuring something and flip from slow to fast rate and the measurement drops to zero. Flip back to slow and my measurement is back. Flip to medium- 0V again.

I noticed though that at voltages below about 3V it DOES work for negative inputs.

Anyone come across this before?