I retired in 1999 so it's been a long time since I used one, but I don't recall
ever seeing a device measured using an HP 3048 system that didn't exhibit line
frequency (and harmonic) spurs.
See the "live" plots at the end of this page:
http://hpmemoryproject.org/news/3048/hp3048_01.htm
Wes
On 7/12/2016 3:44 AM, Martyn Smith 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
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