I recently picked up a new in the box Propscope on eBay for a price I couldn't resist. Going though the understanding signals text and It seems the calibration is off.
Trying to run Activity #1 Ground Test Chanel 1 reports 38.9mV and channel 2 is alternating between 19.5mV and 39mV. It should be showing 0 volts.
Same thing happens with removing the probes from the scope.
I cant find any information on calibration. Did I get a dud or is this fixable ?