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30 Chapter 1
Agilent EXA Signal Analyzer
Amplitude Accuracy and Range
Description Specifications Supplemental Information
Marker Readout
a
a. Reference level and off-screen performance: The reference level (RL) behavior differs from
some earlier analyzers in a way that makes this analyzer more flexible. In other analyzers, the
RL controlled how the measurement was performed as well as how it was displayed. Because
the logarithmic amplifier in these analyzers had both range and resolution limitations, this
behavior was necessary for optimum measurement accuracy. The logarithmic amplifier in this
signal analyzer, however, is implemented digitally such that the range and resolution greatly
exceed other instrument limitations. Because of this, the signal analyzer can make measure-
ments largely independent of the setting of the RL without compromising accuracy. Because
the RL becomes a display function, not a measurement function, a marker can read out results
that are off-screen, either above or below, without any change in accuracy. The only exception
to the independence of RL and the way in which the measurement is performed is in the input
attenuation setting: When the input attenuation is set to auto, the rules for the determination of
the input attenuation include dependence on the reference level. Because the input attenuation
setting controls the tradeoff between large signal behaviors (third-order intermodulation and
compression) and small signal effects (noise), the measurement results can change with RL
changes when the input attenuation is set to auto.
Log units resolution
Average Off, on-screen 0.01 dB
Average On or remote 0.001 dB
Linear units resolution ≤1% of signal level (nominal)