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Using the Analyzer
Measurement Techniques
Measuring Insertion Loss and Return Loss
Simultaneously
By using a coupler you can display both the insertion loss and return loss of a
filter.
The first step is to normalize the return loss path. The DUT will be replaced
with an Agilent 81000BR reference reflector. The 81000BR is a gold-plated
HMS-10 connector for use in measuring return loss of optical connectors. It
allows you to establish a precise reference for reflection measurements.
Return loss is specified at 0.18 dB +/-0.1 dB (96% +/-2%).
1
Connect the equipment as shown in Figure 3-9.
Figure 3-9. Normalize Receiver Input 2 setup
2
Press
Normalize Ref
to access the Normalization menu.
3
Press
Normalize Setup
and make changes as applicable for your device.
4
Press
Normalize Input 2
to normalize the return loss path for the device.
Connecting the coupler output to the source output is similar to placing a
mirror at the coupler input (100% reflections), therefore we have a reflection
of a known value.
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