[time-nuts] Setting up an HP53132A/TimeLab for Time Interval measurement

[Bob Camp]

Hi

There are several approaches to doing 1 pps readings - which one are you trying?

1) Feed in two 1 pps signals, have one start and the other stop the counter
2) Feed in a 10 MHz and a 1 pps signal have the 1 pps start and the 10 MHz stop the counter
3) Feed in an accurate 100 Hz and a 1 ps. Run the same as in 2.

Each has their issues and problems. If you have a very accurate 1 pps, then 2 and 3 work pretty well. If the pps is all over the place then 1 is your only rational way to go. 

Bob

On Aug 23, 2013, at 9:14 AM, James Robbins <jsrobbins at earthlink.net> wrote:

> I am having some difficulty setting up my HP53132A to make 1 PPS Time
> Interval readings.  I am outputting them to TimeLab via the counter's
> "talk-only" output.  TimeLab reads the counter fine and I am able to make
> plots of 10MHz frequency comparisons.  But I need a little help in properly
> setting up the counter for 1 PPS readings.  
> 
> 
> 
> If anyone is familiar with using this arrangement and would be willing
> describe their setup and to exchange a few emails off line, I would much
> appreciate it.  I can be reached at jsrobbins.earthlink.net
> 
> 
> 
> Jim Robbins
> 
> N1JR
> 
> 
> 
> PS:  My reason for trying 1 PPS measurement is that while my 10 MHz
> frequency ADEV ("a") readings in TimeLab when measuring one GPSDO vs another
> GPSDO look very nice, the phase ("p") readings of those same runs show quite
> a bit of drift (e.g. 1.5us/24 hours). 
> 
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