View And Interpret The Impedance Measurement Results - HP 8712ES User Manual

Figure 3-32
Making Measurements
Measuring Impedance using the Smith Chart
Equipment Setup for an S
View and Interpret the Impedance
Measurement Results
1. Press FORMAT
2. To interpret the impedance measurement, refer to
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.
3-76
Measurement of a One-Port Device
11
Smith Chart .
Figure 3-33 for the
ES User's Guide