[time-nuts] Scopes and 1 PPS signals?

Brooke Clarke brooke at pacific.net
Wed Oct 24 23:19:07 EDT 2007


Hi Tom:

It's the period or rep rate I'm trying to determine.

The SR620 has the PRS10 Rb as it's external time base.  It's the period of the 
pulse I'm trying to determine.  i.e. I'm not at all sure it's a 1 PPS and 
expect it may be a serial data clock.

I've added a photo showing the front of the M100 Rb std.
http://www.prc68.com/I/O1814.shtml#M100

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam


Tom Van Baak wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
> 
> 
>>I tried the SR620.  It's  bouncing around a 32 Hz period.
> 
> 
> Brooke,
> 
> You have a house standard, right? (GPSDO or cesium). Use
> your SR620 to take a set of N (10 or 100) TI measurements
> between your local reference and the O-1814 *rising edge*.
> Then again using the O-1814 *falling edge*. The difference
> between these two measurements is the average width of the
> O-1814 pulse. Easy to do & very high accuracy.
> 
> Check the sdev of each measurement to make sure nothing
> funny is going on; a couple of ns is OK. Hint: you get better
> data if you 1) sync the O-1814 1PPS to less than, say, 10 uS
> of UTC, and 2) if the O-1814 is tuned to within, say, 1e-11, of
> your house reference.
> 
> /tvb
> 
> 
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