FBP PRoBE & HP3-60-P4 InsPEct and tEst systEm
25
Relative Power
To measure attenuation,
you must:
1.
Get a
reference measurement
2.
Get an
attenuation measurement
Acquiring
attenuation measurements
(optical link loss)
on optical components or fiber
optic links
(e.g., fiber connectors, cable assemblies, installed fiber optic links)
is done by
measuring the
relative power level (dB)
at the far end of the link or device under test.
1.
INSPECT
, and if necessary,
CLEAN
both the ends of the
reference fiber
.
2.
Connect the optical light
source (OLS)
to the power
meter using the
reference
fiber
.
3.
Press
to turn both
the power meter and light
source (OLS)
ON.
4.
Press
λ
to select
wavelength.
5.
Press and hold
dBm/dB
until
a reference level of
"0.00 dB"
is
displayed on the power meter
display.
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).
Fiber Inspection & testing
cHaPter 6
Reference
Measurement
olS
to Probe
inspect
P
PP
Reference
Fiber
inspect
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.
