Microphone

[shivam.shukla@kuleuven.be]

Hi, 

I am using a PCB Microphone (PCB 378c01) with sound and vibration card 4480. I have a simple VI to acuire data from the Microphone. However, when i run my VI the red LED in card status on and the voltage values from the microphone starts with high value (~15 v) and drop slowly. If I run the VI again the measured voltage from the microphone is less and red LED disappears.  Can anyone suggest why this is happening and what is the solution for this. I configure my microphone and sound pressure microphone. 

[ZYOng]

Which LED? Did you mean Red or Amber?

Front Panel Led Status - National Instruments PXIe-4480 User Manual

[shivam.shukla@kuleuven.be]

In active section the LEC stays RED