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6
Attenuation or relative power level measurement
The relative power level is measured in dB for attenuation measurements of
fibre lines or optical components (e.g. connectors).
This measurement is carried out in two steps and is performed with at least
one additional optical measuring cable and a stabilized light source, e.g.
KE8100 or KE8200.
Measuring step 1 – Reference measurement
Connect the light source and the level
meter KE8000 with a high-quality optical
measuring cable.
The power meter now displays a measu-
red value in dBm, which corresponds to
the level of the light source (level trans-
mitter) minus the attenuation of the mea-
suring cable and the insertion loss of the
plug at the light source itself.
Now press the
REF
key to set this level
value as the reference value.
Measuring step 2 – Attenuation measurement
Now disconnect the measuring cable
from the power meter and connect the
open end via a coupling, e.g. to the fibre
section to be measured. The other end
of the fibre path is now connected to the
level meter. Make sure that the connec-
tion at the power level transmitter is not
detached or altered.
The power meter now displays a relati-
ve power level in dB. This value corres-
ponds to the attenuation of the fibre path
plus the insertion loss of the connector
(coupling).
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Optical Power Meter
dBm
nm
ON
OFF
REF
dbm
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KE8000
ON
Mode
KE8x00
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OFF
Light Source
nm
Hz
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Optical Power Meter
dBm
nm
ON
OFF
REF
dbm
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KE8000
ON
Mode
KE8x00
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OFF
Light Source
nm
Hz