Operation - Megger MPM2000 Guide De L'utilisateur

2.0 Operation

This instrument can be used for multiple applications
including Optical Loss Testing, Optical Continuity
Testing, Acceptance Testing of Fibre Transmitters
and Received Power Testing of optical receivers.
There are multiple techniques to achieve these types
of tests, but a typical procedure is detailed below:
2.1 Optical Loss Testing
Take an optical light source and power meter with
appropriate patch cords and mating adapter (uniter)
to match the optical fibre under test. Clean all the
connectors and connect the light source via the first
patch cord, the uniter and the second patch cord to
the power meter so the attenuation of both cords can
be eliminated. The link to be tested is then inserted
between them so the optical loss associated only with
this link can be found. This test is normally repeated
multiple times with the interconnections between the
patch cord and the fibre under test disconnected and
reconnected before each time and an average result
taken to ensure repeatability and stability.
2.2 Optical Continuity Testing
Use an optical light source (of a known output power)
and power meter with patch leads of a known optical
loss and a uniter matched to the optical fibre under
test. Clean all the connections and insert the link to
be tested between the light source and the power
meter. Measure the output of the light source through
the fibre under test and check that it is above a pre-
determined power level. This is a more simple go, no
– go test.
2.3 Acceptance Testing of Fibre Transmitters
Use a power meter with a suitable dynamic range for
the transmitter under test and patch leads of a known
optical loss. Clean all the connections and connect
the power meter to the transmitter via the patch cord.
Turn on the transmitter and allow the output to
stabilise before measuring the output and comparing
the result to an acceptance standard or versus
historical data. This test is normally repeated multiple
times with the interconnections disconnected and
reconnected before each time and an average result
taken to ensure repeatability and stability.
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