Re: [time-nuts] FE-5680A 1 pps photo
Good image. So, if I read that right it is a pulse about 1 uS wide and goes from base of zero volts to about 5.8 V. Curious why the high level is over 5 V? Is your 5 V supply to the Rubidium unit up there? On 2/3/2012 8:52 PM, Bob Bownes wrote: Just for completeness sake, here is a screen capture off of my DSA-602 of the 1pps. Note that the trace starts 500ns _before_ the 1pps triggers the capture. Ah the wonders of digital sampling. http://www.fastbobs.com/pictures/1pps.jpg Also as a pdf http://www.fastbobs.com/pictures/1pps.pdf Bob ___ 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.
Re: [time-nuts] FE-5680A 1 pps photo
The probe compensation could be off. What type of vertical plug-in was used? The Tektronix 11000 series of oscilloscopes scare me. On Sat, 04 Feb 2012 00:36:13 -0800, Rex r...@sonic.net wrote: Good image. So, if I read that right it is a pulse about 1 uS wide and goes from base of zero volts to about 5.8 V. Curious why the high level is over 5 V? Is your 5 V supply to the Rubidium unit up there? On 2/3/2012 8:52 PM, Bob Bownes wrote: Just for completeness sake, here is a screen capture off of my DSA-602 of the 1pps. Note that the trace starts 500ns _before_ the 1pps triggers the capture. Ah the wonders of digital sampling. http://www.fastbobs.com/pictures/1pps.jpg Also as a pdf http://www.fastbobs.com/pictures/1pps.pdf Bo ___ 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.
Re: [time-nuts] FE-5680A 1 pps photo
Just for completeness sake, here is a screen capture off of my DSA-602 of the 1pps. Note that the trace starts 500ns _before_ the 1pps triggers the capture. Ah the wonders of digital sampling. http://www.fastbobs.com/pictures/1pps.jpg Also as a pdf http://www.fastbobs.com/pictures/1pps.pdf Bob On Thu, Feb 2, 2012 at 1:20 PM, John Howell j...@howell61.f9.co.uk wrote: Not odd but my mistake, I took a picture on both 'scopes and the Fluke gave marginally better results, the text referred to the wrong one. Sorry for the confusion. On 2 Feb 2012, at 16:43, David wrote: Odd. Did Tektronix mark it Fluke PM3082? :) It is nice to know that the current generation of digital cameras can be used for this application. It is too bad that the image has so much noise. On Thu, 2 Feb 2012 16:27:03 +, John Howell j...@howell61.f9.co.uk wrote: and here's another photo of the pulse from one of the newer breed of FE-5680A that require the 5V. Taken with a Sony Cybershot H5, 8 sec exposure, 'scope is an elderly Tektronix 2252 http://dl.dropbox.com/u/1690159/1PPS_1%20FE-5680E.jpg On 2 Feb 2012, at 15:50, Alberto di Bene wrote: I managed to take a photo at the scope screen showing the 1 pps pulse from an old FE-5680A (the one that does not need the 5V and does not output the oscillator signal - just the 1pps). Exposure was 30 sec, F9. The signal was barely visible with naked eye, and some jittering is present. The room of course was in complete darkness, but the reflex of the stand-by led of another instrument can be seen... http://dl.dropbox.com/u/15089947/1pps.gif ___ 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.
[time-nuts] FE-5680A 1 pps photo
I managed to take a photo at the scope screen showing the 1 pps pulse from an old FE-5680A (the one that does not need the 5V and does not output the oscillator signal - just the 1pps). Exposure was 30 sec, F9. The signal was barely visible with naked eye, and some jittering is present. The room of course was in complete darkness, but the reflex of the stand-by led of another instrument can be seen... 73 Alberto I2PHD http://dl.dropbox.com/u/15089947/1pps.gif ___ 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.
Re: [time-nuts] FE-5680A 1 pps photo
and here's another photo of the pulse from one of the newer breed of FE-5680A that require the 5V. Taken with a Sony Cybershot H5, 8 sec exposure, 'scope is an elderly Tektronix 2252 http://dl.dropbox.com/u/1690159/1PPS_1%20FE-5680E.jpg John H. On 2 Feb 2012, at 15:50, Alberto di Bene wrote: I managed to take a photo at the scope screen showing the 1 pps pulse from an old FE-5680A (the one that does not need the 5V and does not output the oscillator signal - just the 1pps). Exposure was 30 sec, F9. The signal was barely visible with naked eye, and some jittering is present. The room of course was in complete darkness, but the reflex of the stand-by led of another instrument can be seen... 73 Alberto I2PHD http://dl.dropbox.com/u/15089947/1pps.gif ___ 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.
Re: [time-nuts] FE-5680A 1 pps photo
Odd. Did Tektronix mark it Fluke PM3082? :) It is nice to know that the current generation of digital cameras can be used for this application. It is too bad that the image has so much noise. On Thu, 2 Feb 2012 16:27:03 +, John Howell j...@howell61.f9.co.uk wrote: and here's another photo of the pulse from one of the newer breed of FE-5680A that require the 5V. Taken with a Sony Cybershot H5, 8 sec exposure, 'scope is an elderly Tektronix 2252 http://dl.dropbox.com/u/1690159/1PPS_1%20FE-5680E.jpg On 2 Feb 2012, at 15:50, Alberto di Bene wrote: I managed to take a photo at the scope screen showing the 1 pps pulse from an old FE-5680A (the one that does not need the 5V and does not output the oscillator signal - just the 1pps). Exposure was 30 sec, F9. The signal was barely visible with naked eye, and some jittering is present. The room of course was in complete darkness, but the reflex of the stand-by led of another instrument can be seen... http://dl.dropbox.com/u/15089947/1pps.gif ___ 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.
Re: [time-nuts] FE-5680A 1 pps photo
Not odd but my mistake, I took a picture on both 'scopes and the Fluke gave marginally better results, the text referred to the wrong one. Sorry for the confusion. On 2 Feb 2012, at 16:43, David wrote: Odd. Did Tektronix mark it Fluke PM3082? :) It is nice to know that the current generation of digital cameras can be used for this application. It is too bad that the image has so much noise. On Thu, 2 Feb 2012 16:27:03 +, John Howell j...@howell61.f9.co.uk wrote: and here's another photo of the pulse from one of the newer breed of FE-5680A that require the 5V. Taken with a Sony Cybershot H5, 8 sec exposure, 'scope is an elderly Tektronix 2252 http://dl.dropbox.com/u/1690159/1PPS_1%20FE-5680E.jpg On 2 Feb 2012, at 15:50, Alberto di Bene wrote: I managed to take a photo at the scope screen showing the 1 pps pulse from an old FE-5680A (the one that does not need the 5V and does not output the oscillator signal - just the 1pps). Exposure was 30 sec, F9. The signal was barely visible with naked eye, and some jittering is present. The room of course was in complete darkness, but the reflex of the stand-by led of another instrument can be seen... http://dl.dropbox.com/u/15089947/1pps.gif ___ 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.
