"ringing" noise on HP54602A scope

Hello,

When I have a pulse generator into channel 1 thru a 50-ohm feedthru I see a damped ringing on channel 2 (1/delta-t ~190 MHz) even though I don't have anything hooked up on channel 2. When I hook up a PMT to channel 2 thru a 50-ohm feedthru any response from the PMT is obscured by the ringing. Actually, with just a 1.5 ft SMA to BNC cable (DC-3GHz, 30pF/ft) connected to channel 2, the amplitude of the ringing about doubles. Is something wrong with my scope or is it something else?

Thanks, Tony

Reply to
a-meier
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Sounds broken to me. You say "amplitude". You don't actually say how big any of these signals are - but I suppose if you can see them, than they're too big.

Reply to
John McMillan

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