Measurement-computing USB-TEMP-AI Manuel d'utilisateur télécharger pdf (Page 18)

USB-TEMP-AI User's Guide Functional Details

Data linearization

An on-board microcontroller automatically performs linearization on RTD and thermistor measurements.

 RTD measurements are linearized using a Callendar-Van Dusen coefficients algorithm (you select DIN,

SAMA, or ITS-90).

 Thermistor measurements are linearized using a Steinhart-Hart linearization algorithm (you supply the

coefficients from the sensor manufacturer's data sheet).

External components

The USB-5203 has the following external components, as shown in Figure 12.

Screw terminal pins 1 to 26

LEDs: Activity (top) and Power (bottom)

Screw terminal pins 27 to 52

USB connector

Figure 12.External component locations

Screw terminals

Use the screw terminals for connecting temperature sensors and digital I/O lines. These terminals also provide

ground and power output connections. Refer to the "Error! Reference source not found." chapter for screw

erminal descriptions.

USB connector

The USB connector provides +5V power and communication. No external power supply is required.

LEDs

USB-TEMP-AI has two LEDs –Activity and Power.

 The Activity LED (top) blinks when data is transferred.

 The Power LED (bottom) turns on when the device is receiving power from the USB cable .

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Measurement-computing USB-TEMP-AI Manuel d'utilisateur Page 18