[time-nuts] Trimble T Lassen 2 - suitableantenna....advice.....questions
tmiller at skylinenet.net
Mon Aug 20 06:44:25 UTC 2012
You can see it easily with any 50+ MHz analog scope that has a working DC
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
----- Original Message -----
From: "Chris Albertson" <albertson.chris at gmail.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Monday, August 20, 2012 1:52 AM
Subject: Re: [time-nuts] Trimble T Lassen 2 -
On Sun, Aug 19, 2012 at 9:27 PM, Robert Darlington
<rdarlington at 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.
Redondo Beach, California
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