I'm getting some strange readings from a mini 3 wire volt meter. I was using it for a project I'm working on and it seemed fine at first. Then the voltages it was displaying seemed very high, so I did a test: I hooked it up directly to a single 8.4 V power supply with nothing else connected.
When I connect the test voltage lead to the PS ground, it reads 21.9 volts. When I connect the test voltage lead to the 8.4 V line, the voltage goes above 99.9 V and the display just says " - - ". When I don't connect the voltage test lead to anything, it goes to about 45 V. I checked all of these voltages with a DMM and I got the expected values: 0 V and 8.4 V.
I have it wired as per directions in a different thread: black wire to ground, red to positive supply, and white is the test voltage lead.
Any advice would be appreciated.