National-instruments Module SCXI-1503 Manual de usuario descargar pdf (Pagina 18)

Chapter 2 Connecting Signals

3-Wire Resistive Sensor Configuration

If you are using a 3-wire resistive sensor, you can reduce the error voltage

by one-half over the 2-wire measurement by connecting the device as

shown in Figure 2-3. In this configuration, very little current flows through

and therefore R

is the only lead resistance that introduces an error into

the measurement. The resulting measurement error is:

Figure 2-3. 3-Wire Resistive Sensor Configuration

VE R

–

SCXI-1503

Channel X

IEX+

AI+

AI–

IEX–

SCXI-1306External Sensor

CH X

I = 100 µA

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National-instruments Module SCXI-1503 Manual de usuario Pagina 18