3-14 Service Guide E8361-90001
Tests and Adjustments PNA Series Microwave Network Analyzers
Preliminary Checks E8361A
Cable Insertion Loss Check
1. With the test port cable still connected to Port 1, connect a short to the other end of the
cable.
2. From the Marker menu, click Marker Search. In the Marker Search dialog box, in the
Search Type box, select Minimum. Click Execute, and then click OK.
3. The displayed response is twice the actual loss. To get the actual worst case insertion
loss, divide the value at the marker annotation by two. Refer to the cable manual to see
if it meets the insertion loss specification. For an example of a typical insertion loss
measurement, see Figure 3-5.
Figure 3-5 Typical Cable Insertion Loss Response
If the Cable Insertion Loss Check Fails
1. Clean the cable and devices and torque to specification. Repeat the check.
2. If the check still fails, the cable should be repaired or replaced.
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