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EXFO Photonic Solutions Div. EPM-ELS-50: 4 Measuring Power or Loss (EPM-50)

4 Measuring Power or Loss (EPM-50): EXFO Photonic Solutions Div. EPM-ELS-50

Measuring Power or Loss (EPM-50) 8

4 Measuring Power or Loss

(EPM-50)

Nulling Electrical Offsets

Temperature and humidity variations affect the performance of electronic circuits

and optical detectors. Nulling the electrical offsets eliminates these effects. You r unit

has been designed not to require offset nulling under normal operation, but you

should perform it whenever environmental conditions change significantly or when

measuring very low power values.

IMPORTANT

If light reaches the detector when nulling offsets, LIGH appears on

the display and the nulling is not performed. You will need to press a

key to return to the previous display.

Note: Factory-defined values will be reinstated when you turn off the unit.

To perform an offset nulling:

Hold down and a few seconds. The unit

displays NULL while nulling the offsets, then returns to

normal mode.

Note: Keypad is disabled during the operation.

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.

To reference the power meter to a source manually:

1. Using the proper adapter, connect a light source (such as ELS-50) to the

detector port of your power meter.

Reference

AdapterReference

test jumper

test jumper

Bulkhead

connector

Light

Power

source

meter

2. Activate the source at the desired wavelength.

3. Match the source and power meter wavelenghts using .

Wavelength is displayed in the top left corner.

4. Hold down for a few seconds. The power meter

stores the currently detected power as the new

reference power.

Reference power is displayed in the top right corner

(in dBm) and current loss reading is automatically

switched to dB.

5. Repeat the procedure for each wavelength you want to reference.

Note: Once all desired wavelengths have been referenced, do not disconnect

the Reference Test Jumper from the source port until all measurements

have been done.

EPM-50/ELS-50 9

Measuring Power or Loss (EPM-50) 10

Measuring Power or Loss

Measuring absolute power is done the same way as referencing the power meter to

a source, except for the referencing step.

To perform power or loss measurements:

1. If necessary, perform an offset nulling (see Nulling Electrical Offsets on page 8).

2. Check and clean your fibers appropriately for optimum performance

(see Cleaning and Connecting Optical Fibers on page 7).

3. For loss measurements, reference your power meter to a light source

(see Referencing Your Power Meter to a Source on page 9), then deactivate the

light source.

4. Using the proper adapter and test jumpers, connect a fiber under test to a light

source (such as ELS-50) and to the detector port of your unit.

Note: If you have referenced your power meter to a source, simply connect a

fiber under test to the test jumpers used for referencing.

Adapter

Tes t

Tes t

jumper

jumper

Bulkhead

Bulkhead

connector

connector

Fiber under test

Light

Power

source

meter

5. Activate the source at the desired wavelength.

6. Match the source and power meter wavelengths using .

Modulation detected

Actual power

When power or loss is outside power limits

or loss

(see Technical Specifications on page 27)

of fiber under test

When the unit detects a modulated signal, it displays the modulation value and

average measured power or loss (see left illustration above). You may notice a

slightly unstable last digit.

7. If necessary, change the displayed units by pressing .

8. Repeat the procedure for other wavelengths.

EPM-50/ELS-50 11

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