[evlatests] Master LO frequency references and the 1.7ms discrepancy

[Barry G. Clark]

It seems to me that the monitor point design must be changed to
measure the lag between the L356 and the GPS, so this doesn't happen
again.

> We located the source of the 1.7 millisecond timing discrepancy.  The
> GPS
> 1PPS signal and the 1PPS signal generated in the L356 were
> mis-synchronized by exactly this amount, with the L356 lagging in
> time.
> This is due either to the L356 having been synchronized to the wrong
> mark,
> or not having been synchronized at all.  We resynchronized the two
> pulses
> this morning at 11am.
>
> Then, at 11:40am, we switched the master frequency reference from
> Hydrogen
> Maser to Rubidium, as planned.  The PPS that is synthesized from the
> Rubidium 5MHz is drifting relative to the GPS at a rate of about 9.8
> microseconds/day.
>
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