40
OLT-85/OLT-85P
6 L
OSS
T
EST
O
PERATION
R
EFERENCING
To switch between dB and Pass/Fail:
J
From the measurement display press the
[
A
]
key and tap
[
dB
]
or
[
Pass/Fail
]
.
Referencing
The actual measured power level relative to a reference value is
displayed in relative power display mode. The reference value
can be set by defining the actual power level as the reference
value or can be edited manually.
To set the reference level in Loss Test mode (valid for all
reference methods):
1.
Decide for one of the Reference methods (see “Loopback and
Remote Referencing” on page 79) and connect the laser
source output directly to the Powermeter input with one, two
or three jumper cable/s.
2.
Switch the laser on (see “Switching on/off the laser” on
3.
Press the
[
A
]
key.
4.
Tap the
[
Referencing
]
button to store the reference level.
The actual power level is set as the new reference level. The
reference level is displayed underneath the wavelength.
Reference power level display mode is activated.
NOTE:
The reference level is stored for each wavelength and is saved
even when the power is off.
In the
Loss Test mode
, the light source (two to four lasers) and
the receiver of the OLT-85 are activated. The wavelengths of the
powermeter instrument are locked to the wavelengths of the
source and can be selected independently.
Pass/Fail indication
Pass/Fail indication for losses is only available in Loss Test mode.
When performing fiber certification, the loss of the fiber system
under test must be measured and compared to a loss limit to
provide a loss margin.
The loss limit is the maximum allowable loss of the overall
system and is based on the following factors:
• Length of the fiber
• Number of connections
• Number of splices