HP 8712C, User Manual, Page: 111 / 559

I
Making Measurements
Measuring Impedance Using the Smith Chart
Press Smith .
If necessary to view the measurement trace, press
.
3. To interpret the impedance measurement, refer to Figure 3-23 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 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 is therefore inductive. The lower half is
the area where the reactive component is negative and is therefore
capacitive.
3-58