To Use Smith Chart Markers; 2-16. Example Of A Log Marker In Polar Format - Agilent Technologies 8719D User Manual

2. Select the type of polar marker you want from the following choices:
Choose LLW ..!!I& if you want to view the magnitude and the phase of the active marker.
n
The magnitude values appear in units and the phase values appear in degrees.
Choose &JG.$LR if you want to view the logarithmic magnitude and the phase of the
n
active marker. The magnitude values appear in dE3 and the phase values appear in
degrees.
Choose .&/X&XK% if you want to view the real and imaginary pair, where the complex
n
data is separated into its real part and imaginary part. The analyzer shows the first
marker value the real part (M cos 0), and the second value is the imaginary part
(M sin 8, where M= magnitude).
Figure
The amount of power reflected from a device is directly related to the impedance of the device
and the measuring system. Each value of the reflection coefficient (I') uniquely defies a device
impedance; r = 0 only occurs when the device and analyzer impedance are exactly the same.
The reflection coefficient for a short circuit is: I' = 1 L 180". Every other value for I' also
corresponds uniquely to a complex device impedance, according to the equation:
where ZL is your test device impedance and Z0 is the measuring system's characteristic
impedance.
Note For greater accuracy when using markers in the Smith chart format, it
is recommended to activate the discrete marker mode. Press (Marker4
enter a value from the front panel keypad to read the resistive and reactive components of
the complex impedance at any point along
The marker annotation tells that the complex impedance is capacitive in the bottom half of
the Smith chart display and is inductive in the top half of the display.

2-16. Example of a Log Marker in Polar Format

the
trace. !I'his is the default Smith chart marker.