How to Eliminate Thermal EMF Measurement Errors

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Pro Benchtop DC Power Supply
+ Pro Benchtop DC Power Supply
Pro Benchtop DC Power Supply
+ Pro Benchtop DC Power Supply

Remove EMF-Induced Measurement Errors

Eliminating thermal electromotive force (EMF) errors in low resistance measurements requires controlling offset voltages introduced by temperature gradients and material junctions. The test setup includes a precision current source and a voltage measurement instrument configured to capture voltage under controlled current conditions. Measurements are taken while applying both forward and reverse current to the device under test.

The error elimination process involves capturing two voltage measurements corresponding to opposite current directions and averaging the results. This technique cancels offset voltage contributions, isolating the true voltage drop across the device. By applying this method, measurement accuracy is improved and resistance values can be calculated without the influence of thermal EMF and offset errors.

Thermal EMF Error Elimination Solution

Eliminating thermal EMF errors requires applying controlled current reversal and synchronizing voltage measurements to isolate the true device response. The solution integrates a precision low-noise current source with a high-resolution voltage measurement instrument to enable accurate resistance calculations. The system supports sourcing both positive and negative current, enabling forward and reverse measurements required for error cancellation. By averaging the voltage measurements obtained under both current directions, offset errors caused by thermal EMF are removed. This technique ensures that the calculated resistance reflects only the device under test, significantly improving measurement accuracy in low resistance applications.
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Block Diagram How to Eliminate Thermal EMF Measurement Errors

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