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DSOX3024 RMS Measurement

Question asked by Willco788 on Sep 7, 2011
Latest reply on Sep 8, 2011 by Willco788
I connected my Boonton power meter calbrator output to my DSOX3024 with a 50 ohm load into ch1 (power meter calibration is due next month).  When I select the AC, RMS, FS measurement it reads 228 mv.   The output of the calibrator is 50MHz, 0dbm (1mv) into a 50 ohm load.  I don't understand why the 3024 measuring 228 mv when the signal is only 1 mv.   The signal is a pure sinewave.