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

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@febo.com A time-nuts@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Hi The quality of the offset signal source matters in a DMTD system. If you are using a “noisy” source you will have trouble with the data. You also will have trouble if the offset signal is correlated in some way to one of the DUT signals. Bob > On Jan 20, 2018, at 3:43 AM, timeok@timeok.it wrote: > > > 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@febo.com > A time-nuts@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 > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.