Resistance measurement specifications

The data logger makes ratiometric-resistance measurements for four- and six-wire full-bridge circuits and two-, three-, and four-wire half-bridge circuits using voltage excitation. Excitation polarity reversal is available to minimize dc error. Typically, at least one terminal is configured for excitation output. Multiple sensors may be able to use a common excitation terminal.

Accuracy:

Assumes input reversal for differential measurements RevDiff and excitation reversal RevEx for excitation voltage <1000 mV. Does not include bridge resistor errors or sensor and measurement noise.

Ratiometric accuracy, rather than absolute accuracy, determines overall measurement accuracy. Offset is the same as specified for analog voltage measurements.

• 0 to 40 °C: ±(0.01% of voltage measurement + offset)
• –40 to 70 °C: ±(0.015% of voltage measurement + offset)
• –55 to 85 °C (XT): ±(0.02% of voltage measurement + offset)