[time-nuts] PRS-10 findings
SAIDJACK at aol.com
SAIDJACK at aol.com
Wed May 30 15:38:48 EDT 2007
Hi Tom,
>Can you refresh me on the topic? I didn't see any
>PRS10 humps here:
>http://www.leapsecond.com/museum/prs10/
We had a discussion about this, and some other folks did see it also.
Sometime around June last year or so, I need to dig up my measurements.
>Just to get a clear idea of your lab set up; how is your counter
>configured exactly; int or ext ref? trigger levels? 1X or 10X
>attenuation, etc.
I am using the PRS10 as the external reference to the 53132A. Maybe not a
good idea? I will try another reference as well.
Also, one more datapoint: I changed the phase relationship away from 80ns,
and the problem seems to have gone away... I need to check into this further.
Maybe it's related to the absolute phase difference between the two channels?
>If you can see the readings on the 53132 display, do they also
>happen when your PC (RS232 or GPIB?) is not electrically
>connected to the counter? Desktop or floating laptop?
RS-232, floating laptop, I get the same readings on the LED and RS232.
>Is the Fury floating (wall wart) or are you using a grounded
>power supply? How is the PRS10 powered? etc.
The Fury wall-wart is also floating, but the PRS10 is grounded. But I think
the periodicity of exactly 15s would indicate some sort of digital issue
rather than analog ground loop etc, wouldn't it?
>Also do the 10 MHz RF outputs show this phase jump or is it
>only in the 1PPS outputs?
Need to check that.
thanks again for your feedback,
bye,
Said
/tvb
************************************** See what's free at http://www.aol.com.
More information about the time-nuts
mailing list