Magnus Danielson wrote:
Filip Ozimek wrote:
I'm trying to calculate AVAR from collected data, but I would expect a
different behavior of my DUT. Does anybody can calculate the AVAR for me?
Gate time was 1s, without any deadtime between measurements,
this is a file http://www.fuw.edu.pl/~fozimek/pomiar61-frep.txt
with collected data.
Would you care to elaborate on how this data was collected?
By the looks of things, if this is indeed frequency data, then it is
interesting to note that data is in steps of 1/4000 Hz every second. For
a 250 MHz oscillator having 4 ns period time, this amounts to a time
resolution of 1 ps. A quick histogram displays that 115 bins is filled
in what looks like Gaussian-like... but it is dragged out by the drift.
Few counters give such numbers, so I am curious. There are ways to
improve frequency measures, but they tend to smooth over data in a
fashion that you don't want for normal ADEV analysis. At the first look
on the data, the source looks very quiet. The ADEV curves plotted looks
more normal.
Second thought, look at the tau=1 to 10 s and you see that it first
rises before the usual slope. This is the effect of averaging in the
counter. I would suspect that a HP53132A is being used.
Cheers,
Magnus
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