Any difference between PXI-4462 and USB-4432 when measuring sound pressure?

[linda_zhuna]

Hi, we used PXI-4462  for data acquisition when measuring sound pressure. It worked good.

But for make our device more portable, we bought USB-4432, and want to use it instead of PXI-4462. The problem now is that the data obtained through USB-4432 have high level background noise, which didn't happen before. 

The thing is, we used the same program for PXI-4462 and USB-4432, the data from PXI are good, but Data from USB have high level noise. Is there any special set needed for USB-4432? or the data acquisition qualities are different between PXI and USB?

[Jason_D]

Linda,

The accuracy of these cards are quite different as is also reflected in the price.  The 4462 and the 4432 have many specifications that are different.  I would suggest that you consult the detailed specifications located at each of these links.  This very likely explains the behaviour you are seeing.  This is a very useful article on obtaining the accuracy of each device.