You can see it easily with any 50+ MHz analog scope that has a working DC
trigger function.
If it is a 1 us pulse width TTL output or close, set the H sweep to 1
us/div, The vertical to 1 volt/div, the triggering to normal, and the
trigger input to DC. Then adjust the trigger point to +1 volt. You should
see a sweep every second. If you turn up the intensity and dim the room
lighting, the pulse should be visible.
If you are using a Tek scope and need help setting it up, just ping me and
I'll assist. Others on this list can also give good advise in seeing this
signal.
Regards,
Tom
----- Original Message -----
From: "Chris Albertson" <albertson.ch...@gmail.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Monday, August 20, 2012 1:52 AM
Subject: Re: [time-nuts] Trimble T Lassen 2 -
suitableantenna....advice.....questions
On Sun, Aug 19, 2012 at 9:27 PM, Robert Darlington
<rdarling...@gmail.com>wrote:
It's a pain to capture on any scope, but really easy to see with an
LED across the output. it's not bright, but definitely easy to see on
my tbolt.
That is true. One must have very good eyes to see a one microsecond pulse
that only happens one per second. Blink and you miss it.
The LED might work but the "for sure" way is to send the PPS to a flip flop
so you can see the state change at 1Hz. Use a solderless bread board and
5V power supply.
--
Chris Albertson
Redondo Beach, California
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