[time-nuts] LPRO Pressure Sensitivity

[SAL CORNACCHIA]

Hi Bob, 
Can You explain what 10 PPT stands for.
Thank You
 





________________________________
From: Bob Camp <lists at cq.nu>
To: Discussion of precise time and frequency measurement <time-nuts at febo..com>
Sent: Thu, January 21, 2010 7:50:43 AM
Subject: Re: [time-nuts] LPRO Pressure Sensitivity

Hi

Yes indeed. 

There really isn't a lot of data out there on pressure on rubidiums. Of course we don't talk about it a lot on our data sheets either ...

If you accept that a normal day might have a 100 millibar change,  That changes the frequency 10 ppt, if the guess is right. At 10X that level it would be as significant as temperature on a good unit. If it was that big it should get a lot more attention ...

Bob


On Jan 21, 2010, at 4:53 AM, Magnus Danielson wrote:

> Bob Camp wrote:
>> Hi
>> Has anybody taken any data on LPRO's to see what their pressure sensitivity is? I'm guessing it's  ~ 0.1 ppt / millibar. That's only a guess backed up by no data at all ....
> 
> Do you mean 1E-13 per millibar? (I am only guessing)
> 
> Cheers,
> Magnus
> 
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