Voltage and current excitation specifications

A 12-bit DAC produces voltage and current excitation. When used for resistance measurement, excitation is active only during measurement.

Voltage excitation

Terminals: U1 - U12

Range: ±2500 mV

Resolution: 0.6 mV

Voltage Excitation Absolute Accuracy (note that ratiometric accuracy, rather than the absolute accuracy or excitation or analog measurement, determines the accuracy of ratiometric-resistance measurements):

  • 0 to 40 °C: ±(0.1% of setting + 1.2 mV)
  • –40 to 70 °C: ±(0.1% of setting + 1.5 mV)
  • –55 to 85 °C (XT): ±(0.1% of setting + 1.6 mV)

Maximum Source or Sink Current (exceeding current limits causes voltage output to become unstable. Voltage should stabilize when current is reduced to within stated limits): ±25 mA

Current excitation

Terminals: U1 - U12

Range: ±2.5 mA

Resolution: 0.6 µA

Current Excitation Absolute Accuracy (note that ratiometric accuracy, rather than the absolute accuracy or excitation or analog measurement, determines the accuracy of ratiometric-resistance measurements):

  • 0 to 40 °C: ±(0.11% of setting + 2.0 μA)
  • –40 to 70 °C: ±(0.12% of setting + 2.5 μA)
  • –55 to 85 °C (XT): ±(0.13% of setting + 3.0 μA)

Compliance Voltage: ±5 V