Example Of A Log Marker In Polar Format - HP 8753E User Manual

2. Select the type of polar marker you want from the following choices:
Choose ;&X#"?!&% 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.
active marker. The magnitude values appear in dE? and the phase values appear in
degrees.
Choose %@&tt;JjX$I$ 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 0, 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 deties 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: r = 1 L BOO. 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 (j-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . _
1. Press (jjj ~~#@j?IjI 'j3JU&&.
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
enter a value from the front panel keypad to read the resistive and reactive components of
the complex impedance at any point along the trace. This is the default Smith chart marker.

Example of a Log Marker in Polar Format

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Making Measurements 2-25