I thought the 103A only went up to 5 MHz ?? Am I mistaken ?? 73, Dick, W1KSZ
-----Original Message----- >From: "Paul A. Cianciolo" <[email protected]> >Sent: Aug 17, 2011 8:09 AM >To: 'Discussion of precise time and frequency measurement' <[email protected]> >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 > > > > > > > > > >_______________________________________________ >time-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
