[time-nuts] Auto TBolt TC Adjust

[Bob Camp]

Hi

If you watch a z3801 or 3805 you can see it switch time constants. There appear to be about 4 steps on the 3805. Beyond that I have only a guess that they are starting in the vicinity of 4 seconds and finishing at or beyond 200 seconds. 

Bob

On Jul 8, 2010, at 4:40 AM, Ulrich Bangert wrote:

> Bob,
> 
>> More or less you would be making the TBolt do a dumbed down 
>> version of what the Z38xx's do. 
> 
> If you have more detailed knowlegde about what the Z38XX do concerning their
> time constant, would you share it with me?
> 
> There has been another thread here on TBolt's time constants. A TBolt that
> has run for some weeks or so lives well with a time constant of 1000. More
> than that is no improvement because then the loop cannot follow the dayly
> temperature changes in a typical flat anymore. 
> 
> Best regards
> Ulrich Bangert
> 
>> -----Ursprungliche Nachricht-----
>> Von: time-nuts-bounces at febo.com 
>> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Bob Camp
>> Gesendet: Donnerstag, 8. Juli 2010 03:23
>> An: Discussion of precise time and frequency measurement
>> Betreff: [time-nuts] Auto TBolt TC Adjust
>> 
>> 
>> Hi
>> 
>> From looking at the numbers on a set of TBolt's it's apparent 
>> that adjusting the time constant after they have been on 
>> power for a while is a good idea. Something like:
>> 
>> Start at 10 seconds until pps is within 10 ns for 5 minutes 
>> Run at 50 seconds until the same condition is met
>> Bump to 200 seconds, check 
>> Bump to 1000 seconds 
>> 
>> More or less you would be making the TBolt do a dumbed down 
>> version of what the Z38xx's do. 
>> 
>> Before I go out and build up a gizmo to read TSIP and shoot 
>> the commands to the TBolt,  I thought I'd see if somebody had 
>> already made one of these up. Anybody have one of these already? 
>> 
>> Thanks!
>> 
>> Bob
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> 
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