Power Measurement How to Measure Power
78 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement 
System, & Agilent 8166A Lightwave Multichannel System, Fourth Edition
 
NOTE If you see the screen shown in Figure 47, the zeroing operation has failed because 
the Power Meter received light. The most common reason for zeroing to fail is if:
• a source is connected to the Power Meter’s input connector, 
• the fiber connected to the Power Meter’s input connector is collecting light, or 
• the Power Meter receives ambient light because the input connector is 
uncovered.
Press Enter and start again at step 1.
4 When the zeroing operation finishes, press the [Close] softkey to close the 
menu.
Figure 46 Zeroing Screen