[time-nuts] Time interval measurement vs dual mixer method
Bob kb8tq
kb8tq at n1k.org
Sat Jan 20 08:26:23 EST 2018
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 at 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 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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