Keysight M937xA PXIe Service Guide 2-17
Tests, Adjustments, and Troubleshooting
Preliminary Checks
d.In the Scale box, set the Scale Per Division for optimum viewing as
shown in Figure 2-6.
8. Place a marker on the largest deflection that goes above the reference line
and is within the cable’s specified frequency range. For a typical response of
cable magnitude and phase stability, see Figure 2-6.
9. Place a marker on the largest deflection that goes below the reference line
and is within the cable’s specified frequency range.
In this S
11
measurement, the displayed trace results from energy being
propagated down the cable and reflected back from the short. Therefore, the
measured deflection value must be divided in half to reach the correct value.
Figure 2-6 Typical Cable Magnitude and Phase Stability Response
If the Cable Magnitude and Phase Stability 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 Connector Repeatability Check
1. With the test port cable still connected to Port 1, connect a broadband load
to the other end of the cable.
2. Press Utility > Preset.
3. Press Response > Avg > Average.
4. In the Average dialog box:
The connector repeatability measurement should be done at the test port
as well as at the end of the test port cable.
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