How to Measure Capacitance and IV

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Parameter Analyzer
+ Parameter Analyzer
Parameter Analyzer
+ Parameter Analyzer

Measure CV And IV Accurately

Discerning whether newly formed lithium-ion (Li-ion) battery cells in electric vehicles (EVs) exhibit acceptable self-discharge behavior requires a potentiostatic measurement method. A low-noise, very stable DC source is set to match the cell's open-circuit voltage (OCV). The DC source connects to the cell through a micro-ammeter and the current flowing between the DC source and the cell is measured. When the cell self-discharges, the DC source takes over, furnishing current to maintain the cell at a constant voltage and state of charge.

As the DC source comes to equilibrium with the cell, the self-discharge current transitions from internally sourced to furnished externally from the DC source. Self-discharge current is measured using the micro-ammeter. The potentiostatic measurement method requires a self-discharge analyzer capable of quickly matching the voltage to within +/- 5 µV of the cell’s OCV before being applied. This process minimizes the introduction of any new charge or discharge changes, limiting measurement settling time to a minimum. The voltage applied to the cell must also be stable to minimize ongoing current noise on the self-discharge current measurement.

Capacitance And IV Measurement Solution

Accurate capacitance-voltage and current-voltage testing requires correct four-terminal connections, a stable return path, and compensation for residual cable impedance and stray admittance. The solution combines a semiconductor device analyzer with source/measure and capacitance measurement capability, automated switching between CV and IV paths, and support for open, short, and load correction in shielded two-terminal setups. It helps configure measurements through a graphical application library, with graph or list results, while supporting capacitance measurement from 1 kHz to 5 MHz, automated return-path control, and on-wafer measurement workflows.
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Block Diagram of Capacitance And IV Measurement Solution

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