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.griffi...@xtra.co.nz>
To: Discussion of precise time and frequency measurement <time-nuts@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<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
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