FE-5680A 1 pps photo

[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 of course was in complete
darkness, but the reflex of the stand-by led of another instrument
can be seen...

73 Alberto I2PHD

Loading Image...

[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

Loading Image...

John H.

Post by 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 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

[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.

Post by 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

Post by 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 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

[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.

Post by 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.

Post by 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

Post by 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 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

[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.


Loading Image...

Also as a pdf

http://www.fastbobs.com/pictures/1pps.pdf

Bob

Post by 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.

Post by 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.

Post by John Howell
........and here's another photo of the pulse from one of the newer

breed of FE-5680A that require the 5V.

Post by David

Post by John Howell
Taken with a Sony Cybershot H5, 8 sec exposure, 'scope is an elderly

Tektronix 2252

Post by David

Post by John Howell
http://dl.dropbox.com/u/1690159/1PPS_1%20FE-5680E.jpg

Post by 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 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

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[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?

Post by 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
Bob

[David]

The probe compensation could be off.

What type of vertical plug-in was used? The Tektronix 11000 series of
oscilloscopes scare me.

Post by 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?

Post by 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
Bo