There may be too much jitter in the mercury relay switching time but
here's an idea for pre-triggering without a signal delay line. If
the time base is triggered off the relay switching voltage it will
start before the relay makes contact and produces the signal pulse.
That delay will be too long but if a delay (such as an electronic
delay - MV, delay line, etc.) is used to hold off the trigger start
time it should be possible to time the signal at the correct sample
point. As I said, I suspect time jitter will be too great but it
would be interesting to try.
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On 24-Aug-13 1:26 AM, sander.slang wrote:
I checked the documents I have found during my TLP
research a year ago before I new anything from 7000 series
I discovered all the research labs and universities were
using the same or similar sampling oscilloscopes from
The first paper talked about a 50 ps rise-time sampling
scope from Tektronix with 1V range and needed a high
quality delay line from corrugated air-spaced
semi-flexible cable connected to the pulse relay via a
resistive signal sampler close by the relay.
The relay was pulsed at 60 Hz (I am using same relay).
This paper is from ~1970
Another paper was from a company that develops similar
See page 2 and 3 from this paper They use identical
hardware I have except for the delay line I do not own.
How do you think they captured this nice 196ps signal with
the S712 and 7854?
Is this as simple as pulsing at 60 Hz and the waveform
will be visible?