[time-nuts] Looking for a Counter
hmurray at megapathdsl.net
Thu Oct 6 17:26:21 EDT 2011
> I'm actually looking a similar problem.. I want to set up an experiment to
> characterize a bunch (several dozen?) of cheap XOs over temperature and
> time and power cycles. I'm not looking for 1e-15 adev at 100 seconds kind
> of performance: maybe more like 1E-6 or 1E-7 ADEV.
I'd like something like that. I suspect other nuts would too. Please let us
know if you find anything interesting.
My first thought was to use a bunch of tvb's picPETs backwards. :) Feed
them all the same PPS and clock each one with one of the clocks you want to
test. But that requires a serial port per XO. Maybe you have an old
many-input serial box in the junk bin, but I'm always short of them.
How about a PIC/AVR listening on a serial port and driving a big mux? You could probably power it and a HC151 from a modem control pin. A PCB would be mostly connectors. If you are going to make a PCB, you might as well wire up any unused PIC pins to various connectors.
Or use USB... A USB to parallel port chip avoids the PIC.
These are my opinions, not necessarily my employer's. I hate spam.
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