Re: [time-nuts] FE-5680A 1 pps photo

2012-02-04 Thread Rex
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

Re: [time-nuts] FE-5680A 1 pps photo

2012-02-04 Thread David
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

Re: [time-nuts] FE-5680A 1 pps photo

2012-02-03 Thread Bob Bownes
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

[time-nuts] FE-5680A 1 pps photo

2012-02-02 Thread Alberto di Bene
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

Re: [time-nuts] FE-5680A 1 pps photo

2012-02-02 Thread John Howell
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

Re: [time-nuts] FE-5680A 1 pps photo

2012-02-02 Thread David
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

Re: [time-nuts] FE-5680A 1 pps photo

2012-02-02 Thread John Howell
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