by alan » Sun Sep 24, 2017 6:31 pm
Hi,
The noise level from the PicoScope 2206B data sheet says that the noise is
< 220 μV RMS (±20 mV range)
From your capture it looks as if you are on the ±200 mV range and have zoomed in vertically. As you use higher voltage ranges the noise will increase to move than the 220uV RMS figure but will be the same or smaller as a % of the total range.
The PicoScope 2206B is an 8 bit device which means there are 256 vertical steps. A single bit of noise will be 0.16mV. On the 200mV range one bit of noise will be 1.6mV and on the 20V range it will be 160mV. This is normal behavior on all scopes - the noise level as a figure in mV goes up as you go up through the voltage ranges but usually as a percentage of the total range it will be around the same or a bit less.
I dont have a 2206B with me so hopefully someone will run a test next week just to confirm what you are seeing is normal but I am fairly sure all is OK and you are seeing a lot of noise due to zooming in.
Regards
Alan