Measurement-computing USB-TC-AI Manual do Utilizador Página 14

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USB-TC-AI User's Guide Functional Details
14
External components
The USB-TC-AI has the following external components, as shown in Figure 5.
1
Screw terminal pins 1 to 26
3
2
Screw terminal pins 27 to 52
4
Figure 5.External component locations
Screw terminals
The screw terminals provide connections for thermocouples, voltage input, digital I/O, ground and power
output. Refer to the "Signal I/O ConnectionsError! Reference source not found." chapter beginning on page
10 for screw terminal descriptions.
USB connector
The USB connector provides +5V power and communication. No external power supply is required.
LEDs
USB-TC-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 .
Power
The two +5V terminals are isolated (500 VDC) from the USB +5V.
Caution! Each +5V terminal is an output. Do not connect to an external power supply or you may damage
the USB-TC-AI and possibly the computer.
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