Measurement-computing USB-TEMP-AI Manual do Utilizador descarregar pdf (Página 15)

USB-TEMP-AI User's Guide Signal I/O Connections

Four-wire, single-sensor

A four-wire, single-sensor connected to the first channel of a channel pair is shown in Figure 7.

Figure 7. Four-wire, single RTD or thermistor sensor measurement configuration

A four-wire, single-sensor connected to the second channel of a channel pair is shown in Figure 8.

Figure 8. Four-wire, single RTD or thermistor sensor measurement configuration

A four-wire, two-sensor measurement configuration is shown in Figure 9.

Figure 9. Four-wire, two RTD or thermistor sensors measurement configuration

When configured for four-wire, two sensor mode, both sensors must be connected to obtain proper

measurements.

Semiconductor sensor measurements

Semiconductor sensors are suitable over a range of approximately –40 C to 125 C, where an accuracy of

±2 C is adequate. The temperature measurement range of a semiconductor sensor is small when compared to

thermocouples and RTDs. However, semiconductor sensors can be accurate, inexpensive and easy to interface

with other electronics for display and control.

The USB-TEMP-AI makes high-resolution measurements of semiconductor sensors, and returns a 32-bit

floating point value in either voltage or temperature.

Use InstaCal to select the sensor type (LM35, TMP35 or equivalent) and the sensor input channel to connect the

sensor.

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Measurement-computing USB-TEMP-AI Manual do Utilizador Página 15