What is the best way to measure or to see any display at the 1 PPS BNC connector, unfortunately I don't have a digital oscilloscope. Best regards,
Sal C. Cornacchia Electronic RF Microwave Engineer (Ret.) ________________________________ From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Sun, February 7, 2010 8:17:08 PM Subject: Re: [time-nuts] No 1 PPS output on a Tbolt The PPS driver appears to use at least 3 inverters from a 74AC04 (U19) connected in parallel with a small series resistor between the parallled inverter outputs and the PPS connector. Open the case and check the waveforms at the 74AC04 inputs and outputs. Check the series resistor for continuity, also check the solder joint between the BNC inner conductor and the PCB. Bruce Bruce Griffiths wrote: > 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<did...@cox.net> >> To: Time-Nuts<time-nuts@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<salc...@rogers.com> >> Date: Sun, 7 Feb 2010 08:42:49 >> To: Discussion of precise time and frequency measurement<time-nuts@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<li...@cq.nu> >> To: Discussion of precise time and frequency measurement<time-n...@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"<salc...@rogers.com> >> Sent: Sunday, February 07, 2010 11:06 AM >> To: "Discussion of precise time and frequency measurement" >> <time-n...@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"<stanw...@verizon.net> >>> To: Discussion of precise time and frequency measurement >>> <time-nuts@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 >>> >>> >>> >> > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
