Agilent Technologies 8163A User Manual page 86

Power Measurement
86
2 Move to the Power Meter channel and press the [Menu] softkey.
Figure 44 Module Channels that are Settling
3 Move to the <Zero> option to zero the current power measurement
channel or the <Zero All> option to zero all power measurement
channels. You will see the screen shown in Figure 45, this appears
for around 30 seconds while zeroing is performed.
Agilent 8163A/B, 8164A/B, and 8166A/B User's Guide, Fourth Edition
How to Measure Power