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test: reFerence MeasureMent
RELATIvE POwER
Attenuation measurements (optical link loss) on optical components or fiber optic links (e.g., fiber connectors,
cable assemblies, installed fiber optic links) are acquired by measuring the relative power level (db) at the far end
of the link or device under test.
Relative power level (attenuation measurement) is the amount of power lost (attenuated) by the optical link being
tested, measured in db. The source of this power is typically a handheld optical light source. This test determines
whether the optical link is constructed properly, either as a qualification test or when troubleshooting the network.
To measure attenuation, you must:
1.
Get a reference measurement (page 13)
2.
Get attenuation measurement (page 14)
Note: Loss testing of single-mode fiber links is specified in ANSI/TIA/EIA-526-7 and ISO/IEC-TR-14763-3.
Loss testing of multimode fiber links is specified in ANSI/TIA/EIA-526-14A and ISO/IEC-TR-14763-3.
REFERENCE mEASuREmENT
Reference
Inspect
P
OLS
IBYC – Fiber inspection, cleaning & test
to Probe
Fiber 1
Inspect
P P
1.
Inspect, and if necessary, clean both ends of
reference fiber 1.
2.
Connect the optical light source (OLS) to the
power meter using reference fiber 1.
3.
Press
to turn both the power meter
and light source ON.
λ
4.
Press
to select wavelength.
5.
dBm/dB
Press and hold
level of 0.00 db is displayed on the power
meter display. For attenuation measurement,
continue to next page.
Note: REF will flash briefly on the power meter to
indicate that the reference level is saved.
Note: DO NOT disconnect the reference fiber
from the light source (OLS).
TEST
until a reference
13
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