On 9/23/11 10:54 AM, Brooke Clarke wrote:
Hi Jim:
Do you know how the HP/Agilent 4395A stacks up as a SA? I really like
the true RMS power detection and the 1 Hz RBW (not video).
<http://www.home.agilent.com/agilent/product.jspx?id=1000000864:epsg:pro&pageMode=OV&pid=1000000864:epsg:pro&lc=eng&ct=PRODUCT&cc=US&pselect=SR.PM-Search%20Results.Overview>
Not off hand.. I'm usually working at microwave frequencies and haven't
used that particular one.
All of those spectrum analyzers with 1 Hz RBW are almost certainly doing
some sort of FFT, and I assume the sample clocks are controlled such
that you can hook up to some sort of external reference with 1E-9 kinds
of stability.
The question might be whether the actual clock performance has good
enough phase noise at 1 Hz offset to make the 1 Hz RBW meaningful. A
-100dBc/Hz @ 1 Hz offset would be mighty impressive, no?
In fact, the specsheet shows of -95dBc/Hz at 1-100kHz offset. The
typical performance is better, of course, but still, it's about
-90dBc/Hz at 100Hz offset.
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