Exfo EPM-500 Power Meter Manual de usuario descargar pdf (Pagina 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.

IMPORTANT

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

AdapterReference

test jumper

Reference

test jumper

Bulkhead

connector

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Exfo EPM-500 Power Meter Manual de usuario Pagina 16