[time-nuts] Of rubidium life and piggy-bank anemia....

[Bruce Griffiths]

Didier Juges wrote:
> John,
>
> I knew we had that conversation before, you gave me your scripts when I was
> writing my Visual Basic program to do the same thing under Windows. This
> program is in a perpetual state of being messed with to reach ever changing
> objectives, but I have been using it for various logging experiments. 
>
> I bought my HP 59307A for something like $10 on eBay.
>
> Didier
>
>   
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com 
>> [mailto:time-nuts-bounces at febo.com] On Behalf Of John Ackermann N8UR
>> Sent: Saturday, December 01, 2007 7:35 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Of rubidium life and piggy-bank anemia....
>>
>> Didier Juges said the following on 12/01/2007 12:56 AM:
>>     
>>> Maybe quasi-simultaneously is adequate, using a switch to 
>>>       
>> sample the 3 
>>     
>>> pairs in rotation.
>>>
>>> The HP59307A can be used for that under GPIB control.
>>>       
>> If anybody's interested, I have a perl script (running under 
>> Linux, using the linux-gpib tools) that controls a 59307A and 
>> HP 5334A to do long-term logging of four PPS sources against 
>> each other.
>>
>> It takes a 100 second average of each PPS source 
>> sequentially; I end up with six log files, each with a tau of 
>> 600 seconds: CS1-GPS, CS2-GPS, RB1-GPS, CS1-CS2, CS1-RB1, and CS2-RB1.
>>
>> If anyone's interested, I'd be happy to make that program 
>> available, though it's not polished up for distribution.
>>
>> The data files from this program are the basis for phase and 
>> adev plots at http://www.febo.com/plots/ which are updated 
>> hourly.  The software that generates those plots is called 
>> stable-stats and is available for download at 
>> http://www.febo.com/time-freq/tools/.  (Unfortunately, at the 
>> moment the plots are out of date as we had a power failure 
>> last week and I don't have the clocks reset yet; that's a 
>> project for this weekend.)
>>
>> John
>>
>> _______________________________________________
>>     
This technique creates the issue of how to correct for the effects of
deadtime.

Bruce