Keysight N7744A User Manual page 53

2
Power Measurement
52
Figure 37
2 Select the channel you want to zero from the drop down list and click
on the "Port" button.
OR
Click on the "All" button.
While the zero is running, the traffic light flashes amber.
If you receive a zero error, 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.
When zeroing is finished, the traffic light is green. You can now
proceed with your measurements.
When environmental conditions are stable, the zero setting will remain
valid over long times and the same settings will be active after rebooting
the instrument.
Keysight N774x Series