Noise studies

Noise studies - scope traces for ch16, which shows the largest amount of 4MHz pickup. The left hand side plots also show some cosmics.

Noise 1950V, 90/10 premix, 10mV/div, 1μs/div

Noise - zoom on 4MHz - 1950V, 90/10 premix, 10mV/div, 200ns/div

After connecting the preamp ground to the preamp end of the cable shielding

Noise - cable shield connected to preamp ground, 1950V, 90/10 premix

Noise - zoom on 4MHz - cable shield connected to preamp ground, 1950V, 90/10 premix

HV on (preamp ground & cable shielding connected)

Noise, 2000V, 90/10 premix

Noise - zoom on 4MHz, 2000V, 90/10 premix

HV off (preamp ground & cable shielding connected)

Noise, 0V, 90/10 premix

Noise - zoom on 4MHz, 0V, 90/10 premix