EXFO FPM-600 Power Meter - Manual (Page 30)

Measuring Power or Loss (FPM-600 and FOT-600)
24 FPM/FLS/FOT-600
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 a reference value is subtracted from the measured power.
Note: You must set a reference value separately for each wavelength.
Compatible sources (such as FOT-600 and FLS-600) can transmit a power
value to your power meter, avoiding the need for manual referencing.
To receive the reference power value from a compatible source:
1. Connect a compatible source to your power
meter (as shown below, with or without a
fiber under test).
2. Use the source to emit the signal that
contains its power value (see To change the
signal modulation: on page 35).

If reference value or units change, the power meter beeps.

The new reference power is displayed in the top right corner (in
dBm) and current loss reading is automatically switched to dB.
Note: When using this feature, you cannot change the power meter’s wavelength
manually. The power meter behavior is totally determined by the source.
I
MPORTANT
The value sent is not the source’s actual power. It is a user-defined
value that may not take the optical link’s loss into account.