This is a follow-on to How the spectrum analyser works. Gerry very kindly gave a substantial answer there so I'm breaking the thread into smaller bits to keep the size manageable. I asked earlier whether the spec...

I'm using a Picoscope 4262 with Picoscope 7.0.80.9088 on an iMac. I'm measuring audio frequency noise in an instrument amplifer, down to Johnson noise. It's giving me some lovely results! And a bit of confusion. I have the scope set to 2 ms/div, sample rate 5 Msamples/s, it tells me in the timebase ...