Hi,
I just got a nice deal on a Fluke 177 on eBay. But I am a bit insecure. When I switch it on, test-probes connected to DMM but open line some of the features do NULL:
V (AC): It's highly fluctuating between 25 and 14 mV, whether I keep the probes still or shake them. I just don't get a zero when probes are open line.
V (DC): after settled at zero, when I shake the probes, it goes up a few mV and then down again.
mV (DC): goes down to zero just fine after switching to this feature, but shaking probes sends it down into the minus.
When I say 'open line' I do not mean the OL in the display. I mean, that the tips of the wires are not connected to anything.
Probe wires are very firm in the device, so I don't know. Is this normal?