I bought an Pico 4223, used. I am not able to measure a simple 4V phone battery, I can very easy measure it with another scope, only with Pico it does not work.
I've downloaded the Pico software, did a zero calibration with x1 probe, set DC, +/5V range, both A and B channels show more or less the same. Which sometimes is way to high voltage, or just something around 300 mV, really random.
Am I doing something wrong, or is the Pico defective? Can it be repaired by the makers?