> I need a recommendation for a simple SA, to be used by non-engineers.
> Resolution of about 1Hz, and accuracy of 1ppM or less.
> The frequency of interest is a 200 Hz slice around 457kHz

Hmm, while others are suggesting buying a purpose built instrument my initi=
al reaction was a DSPic with a graphic display, with each column on the dis=
play being one bucket of the FFT. This shouldn't be too hard for a fixed ce=
ntre frequency item. If needed a button to "Find Centre Frequency" could be=
 fitted if the CF is likely to be off screen, and could then be annotated o=
n screen once found.

Personally I would start with a dual core DSPic, one core doing the FFT, th=
e other dealing with the display and miscellaneous other HMI details. While=
 the DSPic couldn't handle 457kHz directly, by using aliasing and other DSP=
 tricks it would handle this satisfactorily I think.



--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.