VanLUG Email Archive
Andrew Daviel (andrew@daviel.ml.org)
Sun, 17 Jan 1999 04:51:53 -0800 (PST)
On Fri, 15 Jan 1999, Fenton Travers wrote:
> Any one know how to measure as high a resolution of time as possible ie
> greater than 1 millisecond? I know the gettimeofday() call, but on
We use a lot of this stuff at TRIUMF. TDCs - time domain converters, if my
memory serves me correctly (we always the the acronym...). I've done some
work with a VME model marketed by BNC. I think the resolution is a few
picoseconds. The technique is something like feeding a constant current
into a capacitor for the time in question, then measuring the voltage. The
coarse time is got by a regular crystal-controlled (in a
temperature-controlled oven, of course..) clock. This particular model has
8 channels and something like a 48-bit counter. Other varieties are only
good to a nanosecond or so but have 96 channels.
Andrew Daviel
http://vancouver-webpages.com/andrew
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