Keysight Technologies M937 A PXIe Series Service Manual page 36

Tests, Adjustments, and Troubleshooting
Preliminary Checks
Figure 2-5 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.
Cable Magnitude and Phase Stability Check
1. With the test port cable still connected to Port 1, connect a short to the
2. Press Utility > Preset.
3. Press Trace/Channel > Trace > New Trace.
4. In the New Trace dialog box:
5. Press Response > Format > Phase.
6. To provide a good reference, hold the test cable in a straight line.
7. For both Trace 1 and Trace 2, perform the following steps:
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other end of the cable.
a.Click the S11 box.
b.Click OK.
a.To normalize the data trace, click Marker/Analysis > Memory >
Normalize.
b.Slowly make a 180 degree bend in the middle of the cable and hold it in
that position.
c.For each trace, press Response > Scale > Scale.
Keysight M937xA PXIe Service Guide