Isolation Amplifier Shunt Resistor Calculator

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DEW Electronics Tools

Isolation Amplifier Shunt

Example datasheet values

Current to measure

Continuous RMS current (A)

Crest factor (peak/RMS)

Overload to measure (× nominal)

Temperature rise from 25 °C (°C)

Shunt

Shunt resistance (mΩ)

Shunt tolerance (±%)

Shunt temperature coefficient (ppm/°C)

Amplifier

Nominal gain (V/V)

Gain error (±%)

Linear input range (±mV)

Full-scale input range (±mV)

Input offset max (mV)

Offset drift max (µV/°C)

Nonlinearity max (% of full scale)

Readout

SHUNT VOLTAGE AT PEAK CURRENT

—mV

SHUNT DISSIPATION AT RMS CURRENT

—W

WORST-CASE ERROR AT PEAK, BEFORE / AFTER CALIBRATION

—%

CHECKS

—

Errors are summed worst case. A one-point gain and offset calibration at 25 °C removes the gain error, shunt tolerance and initial offset; drift, the shunt's temperature coefficient and nonlinearity remain.