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Instead of measuring the
power transmitted to the
DUT, you can use the
assumed backreflection of
a glass-to-air transition as
a reference.
Figure 3-4
If the refractive index of
the fiber you are using
differs largely from 1.458,
you can set any adequate
reference value.
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Taking Standard Loss Measurements
Measuring the Return Loss
Calibrating for RL Measurements
To calibrate the instrument for Return Loss measurements you have
to
• enter the assumed backreflection and
• measure and store the real backreflection and the power of
parasitic reflections of your setup.
1 Press S
OURCE
indicator lamp must be lit.
2 Press A
to activate the "Select Applications" menu.
PPL
3 Choose "Return Loss".
4 Check the "Head" parameter on the display. If it does not
indicate the input to which you have connected the head, press
H
A
or
H
EAD
5 Press
S
ETTINGS
Return Loss Settings Display
6 Press
RL
REF
Use the rotary knob to change the value. 14.7 dB is the usual
backreflection of a well polished straight glass-to-air transition
based on a fiber refractive index of 1.458. Store with
E
.
NTER
Note: Using the open-end reflection as a reference is simple and
convenient. However, you can also use any other defined
reflection, for instance a mirror.
7 Press
P
REVIOUS
60
O
/O
to switch the source on. The source
N
FF
B
respectively.
EAD
.
.
to return to the measurement screen.
E
or
NTER
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