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热电偶测量时读取CJC的值

主要软件: Driver Software>>NI-DAQmx
主要软件版本: 8.3
主要软件修正版本:
次要软件: N/A

问题: 在用热电偶测量时,我想得到冷端补偿值(cold junction compensation,CJC)。使用DAQmx驱动,在我扫描读取“通道字符串”中所列的模拟输入通道时,能同时读取CJC的值吗?

解答: 使用Force Read from Channel Property可以指定如果所要读取的通道是冷端补偿通道的话是否读取该通道。在默认情况下,DAQmx驱动的 Read VI不会返回冷端补偿通道的值。将该属性设置为TRUE会强制使读取操作在返回task中其它通道的值时同时返回冷端补偿值。

AI.ForceReadFromChan 属性节点可以在DAQmx Channel property node下的Analog Input»Temperature»Advanced»Force Read From Channel下找到。

相关链接: Knowledge Base 25LJ14YF: How to Create a CJC Virtual Channel for Use with Thermocouple Virtual Channels
Knowledge Base 2MO86AMQ: How Can I Read the Value of the Cold Junction Compensation of the SCB-68 (SCB-100)?
Knowledge Base 11SCAVHL: Thermocouples, the SCB-68, and NI-DAQ Virtual Channels/NI-DAQmx Tasks
Knowledge Base 2ZKES05S: Virtual Channel for Thermocouple Won't Allow Built In CJC Values

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报告日期: 04/26/2007
最近更新: 12/08/2007
文档编号: 48PMJRQP

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