[time-nuts] Lamp for FRK Rubidium Needed
cfharris at erols.com
Sun Aug 10 08:45:58 EDT 2014
If I am understanding you correctly, you seem to think that
a rubidium cell standard is a primary reference?
The rubidium cell standard is not a primary reference. Before
you use it as a reference, you need to compare/calibrate it to a
primary standard, such as a cesium beam. Then, like a quartz
crystal, you can adjust your rubidium to the primary standard.
> Chuck Harris <cfharris at ...> writes:
>> Paul's description is spot on.
>> Once the bulb is clear, you are done. The real truth is
>> once it is clearer than it was, it is going to work better
>> than it did... When it is all the way clear, it is a good
>> as it was when it was new, and should last as long as a
>> new bulb would have.
>> -Chuck Harris
>> Peter wrote:
>>> paul swed <paulswedb <at> ...> writes:
>>>> Chuck is correct I have done this trick on FRS units. The glass clears and
>>>> the lamp re-ignites and continues to work for a long time. Actually it
>>>> hasn't failed and this must be 2 years now.
> Thanks to the help from members here I now have a locking FRK.
> My bulb looked pretty clear, and i couldnt find any deposits or "bits"
> inside, but decided to give it a good soaking at about 150 deg C using my
> hot air re-work gun for about 10 mins.
> I have checked it against my Racal ovened reference and found a discrepancy
> of about 0.8 Hz.
> Now the million dollar question...Can I be sure the FRK is good before I
> start to use it as my standard frequency?
> Is the FRK constructed in such a way that the frequency accuracy is assured,
> or do I need some way of verifying the FRK, or calibrating it.
> I dont want to trim my ovened reference to the rubidium, only to find the
> rubidium is not as accurate as I thought?
> Sorry if dumb questions, but just starting my quest for "time nut" status!!!
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