Hi
There are several approaches to doing 1 pps readings - which one are you trying?
1) Feed in two 1 pps signals, have one start and the other stop the counter
2) Feed in a 10 MHz and a 1 pps signal have the 1 pps start and the 10 MHz stop
the counter
3) Feed in an accurate 100 Hz and a 1 ps. Run the same as in 2.
Each has their issues and problems. If you have a very accurate 1 pps, then 2
and 3 work pretty well. If the pps is all over the place then 1 is your only
rational way to go.
Bob
On Aug 23, 2013, at 9:14 AM, James Robbins jsrobb...@earthlink.net wrote:
I am having some difficulty setting up my HP53132A to make 1 PPS Time
Interval readings. I am outputting them to TimeLab via the counter's
talk-only output. TimeLab reads the counter fine and I am able to make
plots of 10MHz frequency comparisons. But I need a little help in properly
setting up the counter for 1 PPS readings.
If anyone is familiar with using this arrangement and would be willing
describe their setup and to exchange a few emails off line, I would much
appreciate it. I can be reached at jsrobbins.earthlink.net
Jim Robbins
N1JR
PS: My reason for trying 1 PPS measurement is that while my 10 MHz
frequency ADEV (a) readings in TimeLab when measuring one GPSDO vs another
GPSDO look very nice, the phase (p) readings of those same runs show quite
a bit of drift (e.g. 1.5us/24 hours).
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