[time-nuts] Data collection cycle -- multiple sources to one counter?

John Ackermann N8UR jra at febo.com
Sun Jun 19 08:39:53 EDT 2005


Poul-Henning Kamp wrote:

>What you really need to look at is how often you revisit each source
>so that you don't get roll-over ambiguities.
>
>  
>
I hadn't thought of that, though with visits measured in minutes I
shouldn't have problems as long as my starting time difference is a few
microseconds.  I've learned that it's very handy to keep one of my
Z3801As running about 10uS fast -- I can use it to sync the 1pps
dividers when I'm measuring against GPS or another on-time source.


>Switching too fast will also wear out your relays, and that is one thing
>to be wary about buying automation multiplexers on eBay:  A lot of what
>is available is there because relays started being unreliable.
>  
>
That's a very good point.

John





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