[time-nuts] How does sawtooth compensation work?
holrum at hotmail.com
Tue Jul 19 02:52:20 EDT 2016
The Tektronix TM509/5009 (and I think the 5010) counter modules have a National Semiconductor noise generator chip in them. It injects noise into the counter to get around counter oscillator/input frequency synchronization. I was once given a TM509 with a bad noise generator chip... Some Very Smart People spent ages thinking the problem was in the device they were working on until they tried a different counter. The Very Smart People (too smart to RTFM) could never figure out why the counter was flakey and finally tossed it. A little dumpster diving a few minutes with a scope yielded a very nice little counter.
> Universal timer/counters and equivalent time sampling DSOs can have
this problem when their timebase ends up synchronized with the signal
they are measuring.
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