I have a brand new DM3058... Just plugged it in, with no probes connected to it, in it's default turn on mode (which for FREQ is 200mV). When I select the FREQ button, it seems to read the AC voltage frequency that it's plugged into. If I raise the scale to 2V or 20V or higher, then it goes to ------- as you would expect.
Wondering if others with this unit can verify this on theirs? It seems strange that it would read the line voltage frequency. I put probes on it and that didn't change. I momentarily went to ------, but then returned to read the plugged in line frequency.
I went through the documentation and couldn't find any reference to this being what it would do. And I'm puzzled.
Thanks in advance, and if you have one and can verify, I would appreciate it,
Alan