[time-nuts] Frequency comparison

[Bob Camp]

Hi

Efratom became part of Datum a while ago. They changed the marking on the LPRO's after the ownership change.

Same product, just a new name on the door.

Bob


On Feb 9, 2010, at 7:28 AM, Joop wrote:

>> It is best to leave your stable quartz and Rubidium oscillators 
>> running continuously, preferably on a UPS in case of power failure, 
>> for best results.
>> 
>> Best regards,
>> 
>> Charles
>> 
> 
> I can understand. But I will not need that high accuracy very often. 
> So I just wanted to examine what can be expected after power-on. Just
> saving a bit of environment where possible.
> 
>> From a Datum LPRO specifications document I read:
> 
> Warm-up: (at -20°C) (at 25°C)
> Time to Lock: < 8.7 min < 5.4 min
> Time to <1E-9: <10.2 min <7.3 min
> Time to <4E-10: <12.7 min <10.6 min
> 
> Frequency Retrace: <±2.5E-11
> (after 24 hrs power on @ 25°C & up to 48 hrs power off)
> 
> I guess my readings are all within the above specs. The retrace value is
> probably the limiting factor. 2.5E-11 translates in my setup to 90ns/hour.
> Which looks being reached already in about 2 hours after power-on. So if
> the Efratom is essentially the same as the Datum, then all looks fine.
> 
> Joop
> 
> 
> 
> 
> 
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