HP 8712ES - View and Interpret the Impedance Measurement Results

3-76 ES User’s Guide
Making Measurements
Measuring Impedance using the Smith Chart
Figure 3-32 Equipment Setup for an S
11
Measurement of a One-Port Device
View and Interpret the Impedance
Measurement Results
1. Press .
2. To interpret the impedance measurement, refer to Figure 3-33 for the
following discussion:
a. The horizontal axis (the solid line) is the real portion of the
impedance—the resistance. The center of the horizontal axis
always represents the system impedance (50 Ω in this example).
b. The dashed circles that intersect the horizontal axis represent
constant resistance. The dashed arcs that are tangent to the
horizontal axis represent constant reactance.
c. The upper half of the Smith chart is the area where the reactive
component is positive and therefore inductive. The lower half is
the area where the reactive component is negative and therefore
capacitive.
FORMAT
Smith Chart