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NI PXIe-4330支持外部激励吗?



硬件: Multifunction DAQ (MIO)>>SC Express>>PXIe-4330

问题: 我想知道NI PXIe-4330在采集应变计输出的数据时,采用一个外部激励源为其供电,并且输入的电源值(电压或者电流值)是一个内部电源不支持的范围。例如,我想用大于3.3V的电压加载到120Ohm的全桥应变计上,我能用PXIe-4330接外部激励吗?

解答:

PXIe-4330内部电源至多为每个通道提供29mA的激励电流。如果您的传感器需要更大的电流或者电压,这时就需要使用外部电源。在任务中设置激励方式为内部激励,并且将电源激励值设置成外部电源的输入值。将PXIe-4330的EX±端子断开,将外部信号源与传感器Ex±相连。然后,连接PXIe-4330的Remote Sense±引脚与传感器的Ex ±引脚相连。由于PXIe-4330板上的ADC利用这个外部激励源作为参考电压,所以将其连接到Remote Sense引脚对测量的准确性是非常必要的。

注意: NI PXIe-4330本身并不支持外部电源,如果设置任务为外部激励,DAQ助手将会报错-200077: Possible Reason(s): Requested value is not a supported value for this property.

Property: AI.Excit.Src

You Have Requested: External

 You Can Select: Internal

The task must be configured for Internal Excitation and set to one of the supported voltage levels.

 然而,你可以通过以上的方式设置PXIe-4330利用外部激励源。



相关链接:
Products & Services: NI PXIe-4330
White Paper: What Is SC Express?
White Paper: Think Big – New Technologies for High-Channel-Count Applications
White Paper: Top Five Considerations for Taking the Stress Out of Strain Measurements
White Paper: Measuring Pressure with Pressure Sensors


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报告日期: 11/08/2010
最近更新: 08/25/2015
文档编号: 5F79O79G