"ringing" noise on HP54602A scope
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"ringing" noise on HP54602A scope

 
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Guest
Posted: Wed Nov 30, 2005 1:35 am    Post subject: "ringing" noise on HP54602A scope Reply with quote
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

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John McMillan
Guest
Posted: Wed Nov 30, 2005 5:23 pm    Post subject: Re: Reply with quote
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.
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neon



Joined: 25 Feb 2006
Posts: 570
Posted: Mon Mar 06, 2006 12:22 pm    Post subject: Reply with quote
it seems to me like a resonant oscillation.

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