National-instruments 24-Bit Half/Full-Bridge Analog Input Module NI 923 Manual de usuario descargar pdf (Pagina 15)

Excitation Voltages

Although the sensor industry does not recognize a single standard

excitation voltage level, excitation voltage levels of between

2.5 V and 10 V are common. You can program the NI 9237 to

supply 2.5 V, 3.3 V, 5 V, or 10 V of excitation voltage, and the

module can provide up to 150 mW of excitation power. Unless you

supply external excitation voltage, National Instruments

recommends that you set the excitation voltage to a value that

keeps the total power below 150 mW. The NI 9237 automatically

reduces internal excitation voltages as needed to stay below

150 mW total power.

The power consumed by a single bridge is where R is the total

resistance of the bridge.

For a quarter or half bridge, R is equal to two times the resistance

of each element. For a full bridge, R is equal to the resistance of

each element.

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National-instruments 24-Bit Half/Full-Bridge Analog Input Module NI 923 Manual de usuario Pagina 15