How to measure Allan deviation

[Mrt12]

Hi,
I have a GPS frequency standard and would like to use it as reference oscillator to measure the Allan deviation of another GPSDO I made by myself. Both oscillators run at 10 MHz.
I have a HP 5316A as well as a HP 5335A counter, both can be used as time interval counters.
So far I have found out that I should divide down both of my oscillators to 1 Hz and then use these two signals as start and stop for the TIC.
However, from the TIC measurements, how do I find out the ADEV?

[edpalmer42]

You need to get a program that does the calculations for you.  I know that sounds a little silly, but it's the truth.  The ones I know of are, in no particular order: Stable32, Timelab, Plotter, Alavar, Allantools.  They're all free.

Stable32 is the 'gold standard'.  It used to be commercial, but as of Jan. 1, it's free.
Timelab is the one I use most.  It can gather data directly from many counters or it can use datafiles.
Plotter is a nice program, but it isn't maintained anymore.  The author passed away a few years ago.

Each program has it's own strengths, weaknesses and quirks.  Try them all and see what you like.

Edit:  Argh!  I forgot that Lady Heather also does ADev.  Sorry Pyro!

Ed