Wirepath WP-TEST-FIBER-400 Owner's Manual page 16

6.4.3 Unit switch
Press to switch between absolute measurement (dBm), relative measurement (dB), and xW of
the optical power (6-9).
6.4.4 Relative value measurement
Each wavelength can set the Ref value. Press
and automatically calculate out the relative value (top right of the screen will display the "ref" and setting
dBm value 6-10) prior to link testing.
Handheld Optical Power Meter
6-8
6-9
to set the current value as the 0 dB ref value
6-10
15
Calibration wavelength
dBm
dB
xW
Relative value setting
Relative value setting