[time-nuts] Time interval measurement vs dual mixer method
timeok at timeok.it
timeok at timeok.it
Sat Jan 20 08:43:56 UTC 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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