[time-nuts] Low-Cost Rubidium Performance

Chris Albertson albertson.chris at gmail.com
Thu Feb 9 16:19:56 UTC 2012

I was just about to write the same thing as below.   Yes you can
measure ADEV with the unit in a temperature controlled box but unless
you intend to use the unit in that same box what does the test tell
you?   These are spec'd for use in unheated cell towers and the
engineer looked at the worse case and said "good enough for my
intended usage"   So if you intend to use this with portable field day
microwave gear then test the unit outdoors while powering with a gas
powered generator.  If it will be used as a lab standard, test it
there.   Mine is in a box with a temperature controlled fan.
Realistically I expect +-2C swings  So I'll measure it inside that

On Thu, Feb 9, 2012 at 7:10 AM, Jim Lux <jimlux at earthlink.net> wrote:
> I suppose you could run your widget in a temperature controlled chamber, get
> those numbers.  Then run it in a less controlled benchtop environment, and
> get those numbers, and claim that the difference is environmental.
> But at some point, what you're interested is the performance of the system
> in the environment in which it will be used.  If you need good ADEV
> performance at the 1000 second tau, then you need an oven, a vacuum bottle,
> or a better design that's less environment sensitive.
Chris Albertson
Redondo Beach, California

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