Atec Agilent-81618A - Manual (Page 78)

Performance Tests Performance Tests
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Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition
N O T E The nonlinearity of the 81626B is not usually tested to the specified
power level of +27 dBm. Instead, limited testing up to +9 dBm is used
to test the electronic circuitry of the 81626B. Above +9 dBm the largest
contribution to nonlinearity is from the absorbing glass filter (which is
tested on a sample basis) that does not change its linearity with time.
Thus it is guaranteed by design that testing the 81626B up to +9 dBm
ensures specification compliance to +27 dBm