6 working in opm mode – EXFO PPM-350C PON Power Meter User Manual
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Working in OPM Mode
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6 Working in OPM Mode
Your unit can also be used as a standard optical power meter (in the OPM mode).
This is particularly useful if you want to measure networks or devices carrying only
one wavelength.
You can measure the output power (in dBm) or loss (in dB) using one of the
unit’s 40 CWDM wavelengths available.
You can select the wavelength that you want to use for your measurements. To
customize the list of available wavelengths, you must use HHDT (refer to the
online help of the HHDT application for more information).
You can set a specific reference value for each wavelength of the list. This
reference value will remain in memory until you store a new one for the same
wavelength.
When you use reference, your unit displays the loss created by the fiber under
test only, since it subtracts a reference value from the measured power.
To perform loss measurements:
1. Clean your fibers properly as explained in Cleaning and Connecting Optical
2. Connect the fiber to the OLT/video port.
3. Turn unit on.
4. Select the OPM mode, by pressing and holding down
a few seconds.
5. Select the test wavelength by pressing
or
until the desired wavelength
is displayed.
6. Press
to select dB, so that the loss is
expressed in dB.
7. Hold down
for a few seconds to take the
reference.
The reference indicator is displayed, showing that the new reference value is
now stored in memory.
Loss measurement is displayed just under the reference value.
8. If desired, you can store the loss measurement in your unit (see Storing Data on
P/F
mode
Threshold/
Next
dBm/
dB
dBm/
dB