[time-nuts] No 1 PPS output on a Tbolt

SAL CORNACCHIA salccor at rogers.com
Mon Feb 8 15:31:33 UTC 2010


Thank You so much for all the great responses for the Tbolt 1 PPS measurements and suggestions how to measure the output of the 1 PPS, unfortunately I am not able to see any output at all, I will contact the seller and make arrangements for an exchange, he is away for about two weeks, I will wait and what he suggests to do.
Thank You so much for all Your help, a great group of well informed peoples.
 
Best regards,

 
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)







________________________________
From: Robert Darlington <rdarlington at gmail..com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Mon, February 8, 2010 10:15:32 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt

Try hooking the output to an LED.  It's very difficult for me to see the
pulse on my analog scopes but there is no arguing with the blinking light.

-Bob

On Mon, Feb 8, 2010 at 8:05 AM, SAL CORNACCHIA <salccor at rogers.com> wrote:

> Thank You John, I have tried with different sweep speeds both above and
> below 100 us/div, the problem appears to be no output at all.
>
> Best regards,
>
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
>
> ________________________________
> From: John Ackermann N8UR <jra at febo.com>
> To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> Sent: Sun, February 7, 2010 8:45:06 PM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> Sal, what sweep time are you using on the scope?  I believe the TBolt
> PPS is only microseconds wide, so you may need to speed up the sweep
> time to around 100us/div or faster to see it accurately.  And you may
> need to mess with delaying the sweep to get the pulse on the screen.
>
> John
> ----
>
> SAL CORNACCHIA said the following on 02/07/2010 08:32 PM:
> > I cannot measure anything, with the scope set at max sensitivity, there
> is only a tiny dot indication every second.
> >
> > Best regards,
> >
> > Sal C. Cornacchia
> > Electronic RF Microwave Engineer (Ret.)
> >
> >
> >
> >
> >
> >
> > ________________________________
> > From: Bruce Griffiths <bruce.griffiths at xtra.co.nz>
> > To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> > Sent: Sun, February 7, 2010 7:45:26 PM
> > Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >
> > Any idea what the pulse shapes you see is with a 1M load and with a 50
> > ohm load?
> >
> > Bruce
> >
> > SAL CORNACCHIA wrote:
> >> Hi Didier,
> >>
> >> When the 50 ohms termination is switch on the oscilloscope there is a
> tiny positive dot deflecting every second, it appears to have a very low
> output.
> >>  Best regards,
> >> Sal C. Cornacchia
> >> Electronic RF Microwave Engineer (Ret.)
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> ________________________________
> >> From: Didier Juges<didier at cox..net>
> >> To: Time-Nuts<time-nuts at febo.com>
> >> Sent: Sun, February 7, 2010 11:51:15 AM
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >> The pulse is narrow, but it should be a full 5V amplitude. The driver is
> pretty beefy, the amplitude does dot drop appreciably when loaded with 50
> ohms on mine.
> >>
> >> Didier KO4BB
> >>
> >> ------------------------ Sent from my BlackBerry Wireless thingy while I
> do other things...
> >>
> >> -----Original Message-----
> >> From: SAL CORNACCHIA<salccor at rogers.com>
> >> Date: Sun, 7 Feb 2010 08:42:49
> >> To: Discussion of precise time and frequency measurement<
> time-nuts at febo.com>
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >> Hi Bob,
> >> The pulse is barely visible on the Tektronix 485 it appears to be a very
> low output.
> >> Best regards,
> >> Sal C. Cornacchia
> >> Electronic RF Microwave Engineer (Ret.)
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> ________________________________
> >> From: Bob Camp<lists at cq.nu>
> >> To: Discussion of precise time and frequency measurement<time-nuts at febo.
> .com>
> >> Sent: Sun, February 7, 2010 11:26:16 AM
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >> Hi
> >>
> >> The 5345 should see it if it's set to 50 ohm termination and DC
> coupling.. A
> >> sweep of the trigger from about 1.5 to 3.5 volts should show it there
> over
> >> most of the sweep.
> >>
> >> Bob
> >>
> >> --------------------------------------------------
> >> From: "SAL CORNACCHIA"<salccor at rogers.com>
> >> Sent: Sunday, February 07, 2010 11:06 AM
> >> To: "Discussion of precise time and frequency measurement"
> >> <time-nuts at febo..com>
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >>
> >>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
> >>>    Best regards,
> >>> Sal C. Cornacchia
> >>> Electronic RF Microwave Engineer (Ret.)
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ________________________________
> >>> From: "Stan, W1LE"<stanw1le at verizon.net>
> >>> To: Discussion of precise time and frequency measurement
> >>> <time-nuts at febo.com>
> >>> Sent: Sun, February 7, 2010 10:47:42 AM
> >>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>>
> >>> Hello Sal,
> >>>
> >>> What are you monitoring the PPS output with ??
> >>>
> >>> It is a short duration pulse.
> >>>
> >>> What does the TboltMON software (available at the trimble website) show
> ?
> >>>
> >>> What does Lady Heather indicate ?
> >>> (She is just waiting to massage your numbers.)
> >>>
> >>> Stan, W1LE
> >>>
> >>>
> >>>
> >>>
> >
> >
> >
> > _______________________________________________
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