Keysight M937xA PXIe Service Guide 2-15
Tests, Adjustments, and Troubleshooting
Preliminary Checks
Figure 2-4 Typical Cable Return Loss Response
If the Cable Return 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.
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. Press Marker/Analysis > Marker Search > Min.
3. The displayed response is twice the actual loss. To get the actual worst
case insertion loss (approximate), 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 2-5 on page 2-16.
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