[time-nuts] Man with too many clocks.

Peter Reilley preilley_454 at comcast.net
Thu Nov 3 09:22:53 EDT 2016


I am using the 1 PPS for the trigger.

Pete.


On 11/3/2016 8:59 AM, Antonio A. S. Magalhaes wrote:
>
> Pete,
>
> Tell us about your trigger: where is it?
>
> Regards,
>
> Antonio/CT1TE
>
> ---
>
> A 2016-11-03 12:20, Peter Reilley escreveu:
>
>> I am the proverbial man with too many clocks and I don't know what 
>> time it is.
>> To correct this situation I have decided to calibrate everything.
>>
>> I have a HP 5370B, a HP 6370A, and a HP 5328A all with the TCXO 
>> option.   I also
>> have some TCXO modules.   I figured that I would calibrate them 
>> against my Trimble
>> Resolution T GPS receiver.
>>
>> I put the 1 PPS signal in one channel of my scope and one of the 10 MHz TCXO
>> signals in the other channel and look at the phase relationship. The 
>> TCXO's are
>> already close enough that I should not be out by more than a fraction 
>> of a waveform.
>> I understand that I have to deal with the 1 PPS without sawtooth correction.
>>
>> I expected to see the 10 MHz signal bounce around but not move more than 1/2
>> of a wave length.   Instead I see the 10 MHz waveform appear steady 
>> for a few seconds
>> then jump a significant portion of the wave.   The jump is too much 
>> to be confident
>> that I have not slipped one cycle.
>>
>> Can I do what I am trying to do or am I missing something?
>>
>> Pete.
>>
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