Difference between revisions of "Noise studies"

Revision as of 16:13, 28 July 2010

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

The traces below also show ch16 at a much smaller timescale, 20 μs/div, with the HV supply to the CDC prototype on and off. HV on (preamp ground & cable shielding connected)

Noise, 2000V, 90/10 premix, 20mV/div, 20μs/div

Noise - zoom on 4MHz, 2000V, 90/10 premix, 20mV/div, 2μs/div

HV off (preamp ground & cable shielding connected)

Noise, 0V, 90/10 premix, 20mV/div, 20μs/div

Noise - zoom on 4MHz, 0V, 90/10 premix, 20mV/div, 2μs/div ]