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Newbie question about calibration

Question asked by wangyiliu99 on Sep 14, 2011
Latest reply on Sep 16, 2011 by am95405
I am using the network analyzer to measure the passive device.
if I change the network analyzer output power level, say from 10 dBm to -10 dBm,
I do the calibration again.
Would anyone explain to me whether it is compulsory or not.
sorry for my naive question.