Referencing your power meter to a source, Reference power, Set reference for – EXFO FTB-3930 MultiTest User Manual
Page 29: Loss measurement
Measuring Power or Loss
Multifunction Loss Tester
23
Referencing Your Power Meter to a Source
Referencing Your Power Meter to a Source
In reference mode, your unit displays the loss created by the fiber under
test only, since it subtracts a reference value from the measured power.
In the illustration, the reference value (-2.62 dBm) is subtracted from the
actual power measured (-2.465 dBm).
Note: The reference value you set for each wavelength remains in memory until a
new one is set for the same wavelength, even when you turn the unit off.
Reference
power
Measured loss
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