[time-nuts] getting a grip on 10811 drift (beginner-ishquestion)

[Bob Camp]

Hi

If you have one of the 10811's out of a Z3801, then it's EFC range is ~ 10X
a "normal" part. There apparently are other odd EFC ranges out there.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Howard
Sent: Monday, November 05, 2012 4:53 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] getting a grip on 10811 drift
(beginner-ishquestion)




On 11/5/2012 3:16 PM, Richard H McCorkle wrote:

>    The EFC specs on a 10811 are a frequency change of > 1 Hz over
> a -5v to +5v EFC span or a sensitivity of roughly 1e-8 per volt
> (varies widely up to about 3e-8 / volt on some units) so you can
> get a ballpark idea of the age rate by looking at the EFC voltage
> change over 24-hour periods.

I have been running it continuously for quite a while.  I fired it up
from cold start early this year and have had it running almost 
continuously, just a few power cycles in that time.

Over the period of three weeks ending today the control
voltage has move approximately 1 volt.

That fits within your 0.05 volts per day.

Thanks to everyone. Lots of interesting and helpful information.

Chris Howard





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