Matt Ettus wrote:
Dicke switches have typically used rates in the low hundreds of Hz, with
a 50% duty cycle. My understanding is that is not necessary, and was
only done to make things easier with the electronics of the time. I
think I would switch at a much lower rate, 1 Hz or less, and probably
use a calibration duty cycle on the order of 10%. This way you can
easily throw out some samples on either side of the switch time without
having to worry too much.
Matt
Actually, the few-hundred-hz rate was chosen to improve the "fidelity"
of the
calculation--the more-often you look at the calibrator, the more
precisely you
can track gain fluctuations in the system gain. This assumes that the
calibration
source fluctuates to a much smaller degree than the total system gain.
I'm thinking of switching at a lower rate also, mostly because doing so is
easy with existing infrastructure in the applications--there's already a
1Hz timeout used for various housekeeping activities.
--
Marcus Leech Mail: Dept 1A12, M/S: 04352P16
Security Standards Advisor Phone: (ESN) 393-9145 +1 613 763 9145
Strategic Standards
Nortel Networks [EMAIL PROTECTED]
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