[time-nuts] Poor Mans ADEV Chart... Very Poor man

Richard W. Solomon w1ksz at earthlink.net
Wed Aug 17 15:47:29 UTC 2011


I thought the 103A only went up to 5 MHz ?? Am I mistaken ?? 

73, Dick, W1KSZ


-----Original Message-----
>From: "Paul A. Cianciolo" <paulc at snet.net>
>Sent: Aug 17, 2011 8:09 AM
>To: 'Discussion of precise time and frequency measurement' <time-nuts at febo.com>
>Subject: [time-nuts] Poor Mans ADEV Chart... Very Poor man
>
>OK,
>
>First let me thank John Miles for writing the TimeLab  software.
>Bill,  W6BNQ for spending time with me on SKYPE explaining some big points I
>was missing.
>All the rest of the group for pitching in and helping me with the
>fundamentals.
>Thank you all very much
>
>Right or wrong I am going to post this in hopes that  comments will help me
>make  my next attempt  be more precise.
>So here goes.
>
>I have a Fluke 103A  Frequency Comparator with a "Linear Phase output"
>
>This linear phase is from 0 to 3.60 Volts  corresponding to degrees.. .01
>volts = 1 degree 3.6 volts = 360
>With a resistive  load the voltage on the comparator, the voltage is not
>3.6 volts but I assume still linear.
>
>The "A" channel  reference input is my GPS Z3801a that has been on
>continuously for at least the last 6 months.
>
>The "B" Channel is the DUT, namely a Rakon Double oven OCXO
>
>The Comparator was operated in the parts = 10 to -7  position
>This was done so I could a good number of sample at 1 sec.
>
>I offset the Rakon osc. so that in the it took roughly 1000 sec for it to
>slip one cycle  compared to the reference
>
>The sampling device is the Dataq  DI-154u a 12 bit  USB A/D convertor with
>associated software.
>The sample rate was 1 sample per sec.
>
>There is another chunk of software that allows the DI-158U to export to a
>Excel file... (more complicated than that but for now explanation suffices)
>
>Once in excel  I copied and saved  the analog voltages to Notepad to make it
>into a text file.
>
>From the text file, imported to TimeLab and measurement button depressed.
>
>Big disappointment, the chart looked similar to what I have seen posted as
>ADEV charts, but the  ADEV at 1000 sec was roughly 10 to -3
>
>HA!!!  Dumb move on my part !!!!   SO after multiplication in excel by what
>I THINK is the digit.. and running  again....
>This is the graph that was created.
>http://www.rescueelectronics.com/FREQUENCY.html
> Look at the bottom of the page and click on the thumbnail
>
>This is my first attempt at the Poor Man's  ADEV chart.
>
>Critiques of all kinds are welcome please!!
>
>
>
>Paul A. Cianciolo
>W1VLF
>http://www.rescueelectronics.com/
>Our business computer network is  powered exclusively by solar and wind
>power.
>Converting Photons to Electrons for over 20 years
>
>
>
>
>
>
>
>
>
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