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                                         Agilent 89440A-1
                                         Frequency and Time-Selective
                                         Power Measurements with the
                                         Agilent 89410A and 89440A
                                         Product Note




When you need to measure the             Limitations of traditional                have distinct disadvantages. First, the
power of signals or noise, the Agilent   instruments                               analog detectors found in most swept
Technologies 89410A and 89440A           You may have used power meters,           spectrum analyzers are designed to
vector signal analyzers (VSAs) offer     voltmeters, noise figure meters, or       measure the spectral components of
several unique advantages over other     oscilloscopes to measure power.           deterministic signals, not random
types of instruments. Excellent level    These instruments are adequate for        noise. When measuring random noise,
accuracy, true RMS power detection,      many types of signals but they also       a correction factor must be applied to
and precise noise bandwidths com-        have several limitations including        the analyzer's displayed noise level.
bine to produce exceptionally accu-      inadequate dynamic range, accuracy,       Second, traditional swept spectrum
rate power measurements. Accuracy        or both. In addition, these instruments   analyzers have analog resolution
is coupled with advanced features        are not frequency selective--they only    bandwidth (RBW) filters that typically
such as time-gating, arbitrary reso-     provide a reading of the total power      have a bandwidth accuracy of 

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