EXFO EPM-500 Power Meter - Manual (Page 16)

Measuring Power or Loss (EPM-500 and EOT-500) 11
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 EOT-500 and ELS-500) 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 Sending Source Power Value
with Signal on page 18).
³
If reference value or units change, the power
meter beeps.
³
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.
To reference the power meter to a source manually:
1. Using the proper adapter, connect a light source (such as ELS-500 or EOT-500)
to the detector port of your power meter.
2. Activate the source at the desired wavelength.
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.
Light
source
Power
meter
Adapter Reference
test jumper
Reference
test jumper
Bulkhead
connector