Re: Q about noise in time interval measurement averging

On 9 Apr 2007 08:44:27 -0700, bill.sloman@xxxxxxxx wrote:

If you were in a position do a serious amount of work, you could
combine a fast clock with a time-to-voltage converter, and get the
timing resolution down to around a few tens of picoseconds. Some years
ago, when I was working on a stroboscopic electron microscope with a
digital timebase, we set up such a system that digitised time
intervals with a resolution of 10psec. Our 800MHz clock was not
crystal-controlled, and our jitter never got better than about 50psec
before the project was cancelled. I believe that John Larkin (Inland
Electronics) sells toys that can do better.

That's Highland Technology. We're only a streetcar ride from the
Pacific Ocean.

But digitizing the output of an encoder to sub-ns resolution is a lost
cause. Nasty influences, like temperature, bearing wear, led
degradation, and a host of others will generate a drift floor well
above that. It would help to know what the op is actually trying to
do.

John

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