[time-nuts] No 1 PPS output on a Tbolt
Bob Camp
lists at cq.nu
Mon Feb 8 17:25:06 UTC 2010
Hi
I keep an old fashion "logic probe" lying around for this sort of thing. If
the light flashes, I have a signal. Much easier than a scope.
Bob
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Joseph M Gwinn
Sent: Monday, February 08, 2010 12:21 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The 1PPS signal is actually quite strong. I would hook a telephone
receiver or perhaps a little speaker to the 1PPS output and listen. The
signal should make an audible click once per second.
Joe Gwinn
time-nuts-bounces at febo.com wrote on 02/08/2010 12:01:46 PM:
> From:
>
> Mark Sims <holrum at hotmail.com>
>
> To:
>
> <time-nuts at febo.com>
>
> Date:
>
> 02/08/2010 12:11 PM
>
> Subject:
>
> [time-nuts] No 1 PPS output on a Tbolt
>
> Sent by:
>
> time-nuts-bounces at febo.com
>
>
> Make sure that the 1 PPS output is enabled... It can be
> turned off by software and that mode can be set in EEPROM.
>
> Also, many scopes have great difficulty showing a 10 uS pulse
> at a 1 PPS rep rate. Digital scopes might not sample it in
> normal display modes (envelope or glitch capture mode can
> help). It can easily get lost on an analog display...
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