44 Chapter 2
Quick Start: Learning How to Make Measurements
Learning to Make Reflection Measurements
6. Press SAVE STATE to complete the process.
Step 3. Measure the device
Measuring Return Loss.
1. Connect your device to PORT 1.
2. Terminate any unused port on your device. You can do this by either connecting a load
to the device's unused port, or by connecting the device's unused port to PORT 2 on the
HP 8753E.
3. Press
Scale Ref, AUTO SCALE to reposition the trace.
4. Press
Marker to read the return loss from the analyzer display as shown in Figure 2-10.
The device response indicates that the filter and the analyzer impedances are well
matched within the frequency range of the filter passband. That is, the reflected signal
is smaller within the filter passband than outside the passband.
In terms of return loss, the value within the passband is larger than outside the
passband. A large value for return loss corresponds to a small reflected signal just as a
large value for insertion loss corresponds to a small transmitted signal.
Figure 2-10Example Return Loss Measurement Trace
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