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Four-Wire TEC Voltage Measurement with the LDT-5900 Series

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Four-Wire TEC Voltage Measurement with the LDT-5900 Series

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The 5% error between four-wire and two-wire measurements can have a large impact on device characterization, including total module power consumption and RAC measurements. For example, the LDT-5980 measures AC resistance by driving a +50 mA square wave and measuring the voltage drop across the TEC. If the LDT-5980 used only two-wire voltage sense the AC resistance measurement uncertainty would be approximately 5%. By implementing four-wire voltage sensing, we are able to guarantee an RAC accuracy of 1%

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