Measurement Functions - Keithley 4200A-SCS Reference Manual

Section 4: Multi-frequency capacitance-voltage unit

Measurement functions

The 4210-CVU can measure these parameters:
•
Parallel capacitance and conductance (Cp-Gp)
•
Parallel capacitance and dissipation factor (Cp-D)
•
Series capacitance and resistance (Cs-Rs)
•
Series capacitance and dissipation factor (Cs-D)
•
Resistance and reactance (R-jX)
•
Impedance and phase angle (Z-theta)
The time domain of the AC current and AC voltage must be processed into the frequency domain to
produce the phasor form of the DUT impedance.
The capacitive impedance (and conductance) are calculated based on the measured AC impedance
and phase.
The next figure shows the vector diagram and fundamental equations for impedance.
The capacitance is calculated from the capacitive impedance and the test frequency using the
formula:
Where:
•
C = Capacitance of the DUT (F)
DUT
•
I = Current of the DUT (A)
DUT
•
f = Test frequency (Hz)
•
V = Measured AC voltage (V)
AC
The inductance (L) can be calculated from the reactance (X) and test frequency (f):
4-2
Model 4200A-SCS Parameter Analyzer Reference Manual
Figure 76: Vector diagram for impedance (Z)
4200A-901-01 Rev. C / February 2017