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为什么在 FieldPoint FP-TC-120的热电偶输入通道上发现有电压输出?

硬件: Wireless Sensor Network>>WSN Nodes>>NI WSN-3226 programmable>>VXI Controllers>>VXIpc-740>>Analog I/O Modules>>FP-TC-120

问题: 当我用万用表去测量FP-TC-120的热电偶输入通道时,我测到了一个电压输出。为什么没有热电偶连接时,我能从热电偶输入通道测到一个电压?

解答: FP-TC-120具备热电偶开路检测功能。为实现热电偶开路检测功能,它会提供一个偏置电压,这个偏置电压会在输入端口上引起一个电压降。这是正常的现象,不会影响您的热电偶输入信号。

Knowledgebase 2MRH88KT. Unrealistic Temperature Readings in FieldPoint Explorer
FP-TC-120 and cFP-TC-120 Operating Instructions
National Instruments FieldPoint Support Homepage


报告日期: 01/07/2007
最近更新: 01/07/2007
文档编号: 1VQGHTUS