Hi, I just got my new scope but I observed a strange behavior. Someone please help me on this. I need to know if the unit I just received is faulty.
I applied a square wave at 1 kHz 4 V p-p (from the unit's function generator output) to channel A. All other channels are off. Channel setup: 10 V full scale, 200 us/div, number of samples at 1MS, no resolution enhancement, probe and software both at 1X.
I zoomed in to take a look at the noise. Due to the scope's 8-bit vertical resolution, the step size is (10/(256-1))*1000 = 39.2157 mV. But, when I measured the actual step size (it looks like a step to me), it was 47.4 mV, about 20.9% more than the expected step size How can this be possible?
I own an old (discontinued model) Picoscope 3204. With the exact setup, I get 39,64 mV, very close to the expected value.
- 3404D MSO