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7.2 Impedance measurement introduction
Bode 100 offers several ways of measuring Impedance, Reflection or Admittance. Impedance,
Reflection and Admittance are directly related to each other by the following equations:
Admittance Y is the reciprocal of the impedance Z .
The reflection coefficient Γ is calculated from the measured
impedance
Z and the nominal impedance Z
0
.
Z
0
can be changed by the user in the measurement configuration. The nominal impedance
Z
0
field is only visible if a measurement trace is set to Reflection.
The Impedance Analysis modes allow you to display the measurement results in various formats. You
can select the result formats by clicking the drop down
Format in the trace configuration box.
Depending on the chosen measurement the following result formats are available:
Impedance Result Formats
Magnitude: Displays the magnitude of the measured
impedance in Ohms.
Magnitude (dB): Displays the magnitude of the
measured impedance in dBΩ.
Phase (°): Displays the phase of the measured
impedance in degrees.
Phase (rad): Displays the phase of the measured
impedance in radians.
Tg: Displays the group delay of the measured
impedance in seconds (see Gain result equations for
details).
Polar: Displays the measured impedance in a polar
chart.
Real: Displays the resistance of the measured
impedance in Ohms.
Imaginary: Displays the reactance of the measured
impedance in Ohms.
Rs: Displays the equivalent series resistance (ESR) of
the measured impedance in Ω. This value equals the
Real part of impedance.
Ls: Displays the equivalent series inductance (ESL) of
the measured impedance in Henry.
Measurement types and applications
OMICRON Lab 37