NI-9227 Thermocouple Wire Module


NI-9227 Thermocouple measurement errors depend partly on the following factors:
• The type of thermocouple
• The accuracy of the thermocouple
• The temperature that you are measuring
• The resistance of the thermocouple wires

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NI-9227 Thermocouple Wire Module


Each channel has a resistor that produces an input impedance between the TC and COM terminals. The gain and offset errors resulting from the source impedance of connected thermocouples are negligible for most applications. Thermocouples with a higher lead resistance can introduce more significant errors.


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NI 9213 Circuitry

Each channel passes through a differential filter and then is multiplexed and sampled by a 24- bit analog-to-digital converter (ADC). The channels share a common ground, COM, that is isolated from other modules in the system.


Common-Mode Voltage

The NI 9213 common-mode range is the maximum voltage between any channel and COM. If COM is not connected, then the common-mode voltage range is the maximum voltage between any two channels. The NI 9213 measures the common-mode voltage level of each channel and returns a warning in the software if the signal is outside the common-mode voltage range.


Open Thermocouple Detection

Each channel has an open thermocouple detection (OTD) circuit, which consists of a current source between the TC+ and TC- terminals. If an open thermocouple is connected to the channel, the current source forces a full-scale voltage across the terminals.