[time-nuts] fast edge, rise time.

[J. Forster]

There are very fast pulsers, some in NIM, that use a charged coax line and
Hg relay to calibrate Pulse Height analyzers. The line length sets the
pulse length; the charging voltage, the pulse height.

-John

================



> Years ago I had a cousin who ran a civilian calibration lab. For
> calibrating
> scopes, etc, for rise time he used a mercury wetted relay which he claimed
> had nearly instant rise time and no bounce. Seems that he used a resistive
> divider and the mercury relay shunted a portion of the divider. With very
> small inductances and capacitance to slow things down it would seem to be
> very fast.
>
> Al, k9si, retired
>
>
>
>> The target is 4ns, while ideas seemed to be clear at some point, now I'm
>> having doubts if better to use a MOSFET or a bipolar transistor
>> as the switch element. Experiments with MOSFETs presented me some
>> difficulties charging the gate capacitance having some trouble to
>> achieve something in the 4ns region. Well 4ns seems hard whatever device
>> anyway.
>>
>> I would be happy to receive some comments/ideas that may pop out of your
>> heads.
>> Thanks.
>>
>
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