[time-nuts] Spec An for phase noise measurements
Matt Ettus
boyscout at gmail.com
Wed Jan 23 19:08:24 EST 2008
> I am seeing the following performance when measuring the built in 30
> MHz reference:
> 100 Hz -81dBc
> 1 kHz -108 to -110
> 10 kHz -117
> 100 kHz -125
> 1 MHz -131
>
> All of those are 3-8dB better than the spec, except for at 1 MHz where
> the spec is -135. The measurements do jump around a bit.
If I change to "Digital mode for <100 Hz RBW", and turn on averaging,
I get much better results from the analyzer --
100 Hz -100dBc
1 kHz -110
10kHz -120
100kHz -129
1M -135
This, of course, makes me question all the measurements....
Matt
More information about the time-nuts
mailing list