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
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Noise - zoom on 4MHz - 1950V, 90/10 premix, 10mV/div, 200ns/div
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After connecting the preamp ground to the preamp end of the cable shielding
Noise - cable shield connected to preamp ground, 1950V, 90/10 premix
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Noise - zoom on 4MHz - cable shield connected to preamp ground, 1950V, 90/10 premix
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HV on (preamp ground & cable shielding connected)
Noise, 2000V, 90/10 premix, 20mV/div, 20μs/div
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Noise - zoom on 4MHz, 2000V, 90/10 premix, 20mV/div, 2μs/div
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HV off (preamp ground & cable shielding connected)
Noise, 0V, 90/10 premix, 20mV/div, 20μs/div
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Noise - zoom on 4MHz, 0V, 90/10 premix, 20mV/div, 2μs/div ]
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