I recently scored a Fluke 113 for cheap from the interwebs.
The first thing I tried was to connect it to my bench PSU and it works well. It can't measure anything below about 0.6V (I suspect because of its elaborate automatic "V-Chek" mode). Decent results up to 30 VDC which is where my PSU stops. Great, I'm pretty happy so far.
The second thing I tried was to test a coin-cell (CR2025, 3V Lithium) that was lying around nearby on my desk. Another meter (known good and highly accurate) verifies this cell is about 3.2 volts.
When I connect the F113's black lead to the negative of the cell and red lead to the positive, I get NO READING from the meter. Swapping the probes, gives a reading of -1.541 volts. What the heck?
I don't quite understand the discrepancy. Is this mismatch due to the "Low Impedance" input of the meter? Is the ESR of the coin-cell interacting with the meter's low impedance input?
Is this normal for a low impedance input range on a DMM? And in particular on an F113?