How do I set the Rise and Fall Times reference level on my N1911A/N1912A P-Series Power Meter?

To set the Rise and Fall Times reverence level on your N1911A/N1912A P-Series Power Meter, you will need the firmware version A.02.01 or above. Press System > 1 of 2 > MeasConfig to reach the Measurement Configuration Screen and this will let you to set the Trace Ref Lvl 1 / Lvl2.