[time-nuts] Determination of the placement of the first pps
J. L. Trantham
jltran at att.net
Thu Jan 26 04:35:23 UTC 2012
I'll have to get one of those 'round TUIT's' one of these days and check
mine.
The interval clearly is not something near .8 sec and, likely, truly 1 PPS
along with the 10 MHz output. However, by time nut standards, I have more
work to do.
Joe
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Scott Newell
Sent: Wednesday, January 25, 2012 9:57 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Determination of the placement of the first pps
At 09:13 PM 1/25/2012, J. L. Trantham wrote:
>Both pin 3 and pin 6 are 'high' when power is first applied. When the
>unit 'locks', both pin 3 and 6 go 'low' but pin 6 then puts out a 5
>uSec wide 1 PPS pulse, as judged by my 'calibrated eyeball' which means
>that I used a stop watch and counted the time for 10 sweeps of my
>scope, triggered by pin 6 and set for 5 mSec/cm sweep. These are,
>indeed '1 pulse per second' pulses.
I attempted to test a FE-5680A pps against the tbolt. I had the 10
MHz tbolt out to my (somewhat flaky) 5370A's ref in. Here's what I
got for 100 events, which took about 3:20 to complete:
mean: 999.999 900 993 ms
sdev: 253 ps
min : 999.999 900 49 ms
max : 999.999 901 68 ms
evnt: 100
Now this was a few days ago and I was confused so don't put too much
trust in these numbers. FYI, the tbolt pps output measured as (not
freq, not period):
mean: 1.000 000 099 83 Hz
sdev: 289 pHz (?)
min : 1.000 000 099 04 Hz
max : 1.000 000 100 62 Hz
evnt: 100
--
newell N5TNL
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