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Chapter 1 21
Agilent EXA Signal Analyzer
Frequency and Time
d. In most cases, the frequency readout accuracy of the analyzer can be exceptionally good. As an
example, Agilent has characterized the accuracy of a span commonly used for Electro-Mag-
netic Compatibility (EMC) testing using a source frequency locked to the analyzer. Ideally, this
sweep would include EMC bands C and D and thus sweep from 30 to 1000 MHz. Ideally, the
analysis bandwidth would be 120 kHz at −6 dB, and the spacing of the points would be half of
this (60 kHz). With a start frequency of 30 MHz and a stop frequency of 1000.2 MHz and a
total of 16168 points, the spacing of points is ideal. The detector used was the Peak detector.
The accuracy of frequency readout of all the points tested in this span was with ±0.0032% of
the span. A perfect analyzer with this many points would have an accuracy of ±0.0031% of
span. Thus, even with this large number of display points, the errors in excess of the bucket
quantization limitation were negligible.