[time-nuts] Does a frequency counter locked to GPS need to "warm up"?
magnus at rubidium.dyndns.org
Thu Feb 8 05:26:58 EST 2018
On 02/08/2018 08:33 AM, Chris Wilson wrote:
> 08/02/2018 07:31
> Does a frequency counter connected to a permanently running (Trimble Thunderbolt) GPS
> disciplined frequency standard need to warm up after switch on before readings settle?
> Just curious, thanks.
Well, while the internal reference is not directly steering, if it is
being locked to the external reference, at least some warming up is
needed before it is very stable.
Also, depending on the details of the counters, high resolution
interpolators may need warmup to perform well and for the autocal to
perform meaningfull values.
However, usually it's not very long times and often shaddowed by the
internal referece anyway.
Just to get a rough reading, no. If you want to trust it and trust the
noise, let it warm up for half an hour or so.
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