On 1/11/2012 12:22 PM, Tom Holmes wrote:
You might also consider adding the TAPR Fat PPS to stretch the pulse. See
TAPR.org.
Tom Holmes, N8ZM
Tipp City, OH
EM79
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David
Sent: Wednesday, January 11, 2012 10:17 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A arrived
On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither<smit...@c-c-i.com>
wrote:
Joseph Gray wrote:
I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
of noise that looks like a multi-stepped sine wave. I'm using a TDS
340 scope.
I can see the 1 usec, 1pps on mine, but only if I use an analog storage
scope.
Although my HP54000 series scope triggers at 1PPS, for the life of me I
cannot get it to display the 1 usec pulse :-(.
You might need to darken the oscilloscope environment or use a viewing
hood.
Some analog non-storage oscilloscopes, either because of design or age,
are not
going to be able to display a short pulse at 1 second intervals. I tested
this on my
old but in good condition 2230 and it could display it dimly in normal
room light but
my older worn 7603 can not.
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Or you might take a look at Don Lancaster's TTL Cookbook. All kind of
pulse stretchers in there.
Randy
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