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

SAL CORNACCHIA salccor at rogers.com
Mon Feb 8 15:05:51 UTC 2010


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
>>>
>>>
>>>
>>>      
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at 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 at 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 at febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


More information about the time-nuts mailing list