Multi-Frequency Capacitance-Voltage Unit; Introduction; Measurement Overview - Keithley 4200A-SCS Reference Manual

In this section:

Introduction .............................................................................. 4-1

Measurement overview ............................................................ 4-1

4210-CVU connections ............................................................ 4-5
Connection compensation ...................................................... 4-10
CVU Real-Time Measure Mode ............................................. 4-18
Confidence Check .................................................................. 4-19
4210-CVU project example .................................................... 4-21
Timing diagrams ..................................................................... 4-25
CVU Terminal Settings Advanced settings and circuits ......... 4-31
C-V projects ........................................................................... 4-33
Introduction
The 4210-CVU Multi-Frequency (1 kHz to 10 MHz) Capacitance-Voltage Unit is an impedance
measurement module that can be installed in the 4200A-SCS.
The AC test signal (10 mV
Measurement overview
The 4210-CVU makes AC impedance measurements (Z
sourcing an AC test voltage across the device and measuring the resulting AC current and AC
voltage. The AC current is measured as shown in
page 4-6).
The HCUR/HPOT and LCUR/LPOT terminal pairs are interchangeable. Each provides the full
capability of the other pair.
The simplified model of a device-under-test (DUT) is a resistor and a capacitor. As shown in the next
figure, the 4210-CVU can measure the DUT as a series configuration of the resistor-capacitor (RC) or
as a parallel RC configuration.

Multi-frequency capacitance-voltage unit

) can be DC voltage biased from −30 V to +30 V.
to 100 mV
RMS RMS
Figure 75: Measure models (simplified)
) of the device under test (DUT) by
DUT
Typical 4210-CVU test connections to a DUT
Section 4
(on