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 <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> 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 <[email protected]> > To: Discussion of precise time and frequency measurement <[email protected]> > 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<[email protected]> >> To: Time-Nuts<[email protected]> >> 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<[email protected]> >> Date: Sun, 7 Feb 2010 08:42:49 >> To: Discussion of precise time and frequency measurement<[email protected]> >> 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<[email protected]> >> To: Discussion of precise time and frequency measurement<[email protected]> >> 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"<[email protected]> >> Sent: Sunday, February 07, 2010 11:06 AM >> To: "Discussion of precise time and frequency measurement" >> <[email protected]> >> 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"<[email protected]> >>> To: Discussion of precise time and frequency measurement >>> <[email protected]> >>> 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 >>> >>> >>> >>> > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
