ABB NTDI01 Digital interface terminal unit

ABB NTDI01 Digital interface terminal unit

Input offset is any error voltage that appears to be added to the input signal; that is, its effect is multiplied by the gain of the instrumentation amplifier. Output offset is any error voltage that appears to be added to the output signal; that is, its effect is independent of the gain of the instrumentation amplifier. At a fixed gain these errors are indistinguishable; thus, it is necessary to switch between gains to properly calibrate the SCXI-1140. Your accuracy needs determine how carefully the offsets need to be calibrated. A typical requirement might be for total offset referred to output to be less than half of an LSB of the data acquisition board being used. For example, a 12-bit, 20 V system has a resolution of 20 V/212 = 4.88 mV. Calibration to under 2 mV would thus be sufficient for most applications. The SCXI-1140 is factory calibrated to have total offset referred to output of less than 2 mV at low gains.

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