[time-nuts] Measure GPSDO stability with minimum resources?

[Chris Albertson]

Wouldn't "aging" be the change in the temperature v. frequncy graph over
time?      It is hard to hold temperture constant so maybe record the
function at several different times.

This is one big advantage of using a microprocessor inside the GPSDO, It
can log internal data to either a SD card or use a USB link to a PC to be
recored in log files.   Even my "simple as possible" GPSDO push data to a
PC over USB.   It is easy to glue a temperature sensor to "whatever" and
log it

On Wed, Oct 5, 2016 at 10:14 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

>
> j99harman at gmail.com said:
> > Unless the oscillator is still warming up, 5 minutes or even 60 is way
> too
> > short a time to look at aging. For aging, you will want to look at the
> > change in DAC values over several days at least.
>
> I think it's worse than that.  You have to hold the temperature constant,
> and
> maybe even the power supply voltage.  A probe on the crystal can might
> allow
> you to correct for temperature.
>
>
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
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-- 

Chris Albertson
Redondo Beach, California