[time-nuts] Time interval measurement vs dual mixer method

timeok at timeok.it timeok at timeok.it
Sat Jan 20 03:43:56 EST 2018


   Hi Corby,
   I did several tests to verify the system noise floor using the same source for both input channels. I have seen that the result varies a lot as the difference in time between the two channels varies.
   Moreover, if I do two successive tests without  changing the parameters and the duts, the result can not be superimposed.
   It may be that I make a mistake or do not take any parameter into account.
   I also wonder if there is any commercial realization of the DMTD system.
   Cheers,
   Luciano


   Da "time-nuts" time-nuts-bounces at febo.com
   A time-nuts at febo.com
   Cc
   Data Thu, 18 Jan 2018 11:13:54 -0800
   Oggetto [time-nuts] Time interval measurement vs dual mixer method
   Luciano,

   Not sure what you mean by "two measures made on the same DUT never
   coincide".

   The plotter program takes out wraps which since your phase gain is so
   large are due to happen.

   For lower Tau measurements just adjust the phase for close to equal and
   run shorter plots.

   These can be spliced into the longer Tau plot.

   I routinely get repeatable plots on the same DUT with my DMTD setup.

   Careful setup and understanding what you can and cannot accomplish is the
   key.

   Cheers,

   Corby
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