1PCS NEW National Instruments NI-9214 Thermocouple input Module with NI TB-9214

Description

1PCS
NEW National Instruments NI-9214 Thermocouple input Module with NI TB-9214
NI 9214
16 channel constant temperature thermocouple for USB, Ethernet and Wi Fi
16 channels, 68 s / s total sampling rate, ± 78 MV, isothermal C series temperature input module
Ni 9214 and tb-9214 16 TC, ± 78 MV, 24 bit, 68 s / s multi-channel integration, isothermal junction box • isothermal junction box, measurement accuracy 0.45 ° C • 50 Hz / 60 Hz noise suppression • measurement sensitivity 0.02 ° C • 250 VRMs, cat II, channel to ground isolation Ni 9214 is a high-density thermocouple module used in compactdaq and compactrio systems.
Ni 9214 is designed for a high-precision high-channel counting system. It has a front-end fixed junction box (tb-9214), CJC sensors in multiple junction boxes, and a component layout that minimizes thermal gradient to increase overall accuracy.
Ni 9214 circuit TC + TC – com Ni 9214 input impedance 10 m Ω 10 m Ω open circuit thermocouple detection current filtering differential amplifier and multiplexer isolation ADC • each channel is sampled by a 24 bit ADC after passing through the differential filter and multiplexer. • Channels use a common ground (COM), which is isolated from other modules in the system.
The common mode voltage range of the common mode voltage Ni 9214 is the voltage value of any channel to com. If com is not connected, the internal common mode voltage of the input circuit is the average value of all inputs.
Ni 9214 measures the common mode voltage level of each channel. If the signal is outside the common mode voltage range, it returns a warning in the software.
Open circuit thermocouple detection each channel has an open circuit thermocouple detection (OTD) circuit, which contains the current source between TC + and Tc -. If the open thermocouple is connected to the channel, the current source will apply full range voltage between the terminals.
Input impedance each channel has a resistor to generate input impedance between TC and com terminals. The gain and offset errors caused by the source impedance of the connected thermocouple are negligible for most applications. Thermocouples with higher wire resistance may introduce more significant errors.
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