Unless your DUT is in a mu-metal enclosure, I wouldn't say observing the same results while battery powered provides any conclusive statement as to whether or not its the DUT. The terminals around a crystal are pretty high impedance at line frequencies.
On Tue, Jul 12, 2016 at 6:44 AM, Martyn Smith <[email protected]> wrote: > Hello, > > I have a customer who is measuring the phase noise of my 10 MHz ultra-low > phase noise frequency standard. > > He is seeing spurious signals at line frequencies (50 and 100 Hz as we are > in Europe) at a level around -130 dBc. > > My opinion is that it's impossible to get much better than that. Even > running on batteries make little difference, since the equipment is in a > test rack with AC signals everywhere. > > Even the £50k R&S test set he is using only quotes a spurious spec of -90 > dBc. > > What experience does anyone have here? > > Best Regards > > Martyn > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
