On 10/22/2015 2:53 PM, Grasso, Charles wrote:
ANSI C63 **requires** the use of a preselector on an SA when making QP
measurements
of a signal with a low repetition rate (lower than 20Hz or less). Does
anyone know why?
It's likely that a low-PRF, short pulse able to even approach the QP
limit would require amplitudes high enough to drive a broadband front
end into overload and saturation, adding IMD products to whatever other
emissions an EUT might generate and reducing the _*measured*_ level of
other emissions that could exceed a limit.
Cortland Richmond
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