Keysight Technologies M937 A PXIe Series Service Manual page 38

Tests, Adjustments, and Troubleshooting
Preliminary Checks
a.Click the check box for Average ON.
b.Select an Averaging Factor of 100.
c.Use the default Average Type selection of Sweep.
d.Click OK.
5. Wait for the analyzer to average the measurement 100 times (approximately
five seconds).
6. To normalize the data trace, click Marker/Analysis > Memory > Normalize.
7. To adjust the display scale:
a.Press Response > Scale > Scale.
b.In the Scale box, set the Scale Per Division for 0.5 dB.
c.Click OK.
8. Disconnect and then reconnect the cable to the test port. Tighten the
connection to the specified torque for the connector type.
9. Click Response > Avg > Averaging Restart.
10.Look at the trace for spikes or modes.
11.To re-normalize the data trace of the reconnected cable, click
Marker/Analysis > Memory > Data -> Memory.
12.Repeat steps 9 through 11 at least three times to look for modes. Modes
appear when a harmonic of the source fundamental frequency is able to
propagate through the cable or connector. It is helpful to print a plot of the
trace each time to compare several connections. If any mode appears each
time the cable is connected and reconnected, measurement integrity will be
affected.
For a typical response of cable connector repeatability, see
page
13.For the Port 2, 3, and 4 Check, connect the cable (with the load attached) to
the respective port and repeat steps 2 through 13.
2-18
2-19.
Keysight M937xA PXIe Service Guide
Figure 2-7 on