Service Guide N5230-90024 3-15
PNA Series Microwave Network Analyzers Tests and Adjustments
N5230C Preliminary Checks
Cable Magnitude and Phase Stability Check
1. With the test port cable still connected to Port 1, connect a short to the other end of the cable.
2. Press Preset.
3. On the Trace menu, click New Trace. In the New Trace dialog box, click the S11 box, and then click OK.
4. On the Trace menu, click Format. In the Format dialog box, click Phase, and then click OK.
5. On the Channel menu, click Average . In the Average dialog box, click the Average ON check box. In the
Average Factor box, type 50 or click the arrows to select 50, and then click OK.
6. To provide a good reference, hold the test cable in a straight line perpendicular to the front panel of the
network analyzer.
7. On the Channel menu, click Restart Avg.
8. Wait for the analyzer to average the measurement 50 times (approximately two seconds).
9. To normalize the data trace:
a. On the Trace menu, click Math/Memory.
b. In the Math/Memory dialog box, click the Data->Memory button.
c. In the Data Math list, select Data/Memory.
d. Under Trace View Options, make sure Data Trace is selected.
e. Click OK
10. Slowly make a 180 degree bend in the middle of the cable and hold it in that position.
11. For each trace: On the Scale menu, set the Scale Per Division for optimum viewing as shown in Figure
3-6.
12. 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 3-6.
13. 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.
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