Exactly what I have run into.
Some systems lock an internal reference to to the incoming system. So that
oven has to come up to temp. Then the trigger and interpolators need to
warm up and stabilize.
So the really right answer is what accuracy are you looking for? Because
what I mention above may
Hi,
Well, actually there is two methods:
1) Switch reference clock - a switch or mux changes which clock is being
used.
2) Lock internal reference to external reference - a PLL lock of the
internal reference to the external reference is enabled.
For both, the counter core may need to heat up.
Yes, You have removed the reference from the warmup but the input circuits
still need time to reach thermal equilibrium for most accurate results
On Feb 8, 2018, at 3:34 AM, Azelio Boriani wrote:
No warmup needed if the counter switches to the external reference. If
the counter uses the ext
Hi
It depends a *lot* on the frequency counter. An old style “just count the
number of
edges” device should be good to go pretty fast. One of the “fry an egg on it”
interpolating
counters that get into the 20 ps range may well need some time to stabilize. If
you
are doing ADEV runs, a couple
Hi,
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
No warmup needed if the counter switches to the external reference. If
the counter uses the external reference to lock the internal one then
it is better to wait until the internal one is stable, maybe the
counter has a standby mode where it appears powered off but the
internal reference is active