Can a USB Bus Support 32 channels of NI 9239 at 50 KS/s/ch Sampling Rate?

Updated Feb 2, 2018

Reported In

Hardware

  • NI-9239
  • cDAQ-9178

Issue Details

I have cDAQ 9178 and 8 C series modules NI 9239 and I would like to know if the USB bus can support 32 channels at 50KS/s sampling rate.

Solution

Yes, the USB Bus of cDAQ 9178 can support easily 32 channels at 50 KS/s/ch sampling rate.

Below the calculation:

Throughput = Sampling Rate per channel * Number of Channels * (Resolution Bits/8)
In your case, throughput = 50KS/s/ch * 32 ch * 3 Bytes  =  4800 KB/s = 4.6875 MB/s

The USB 2.0 Bus throughput is 480 Mbit/s which means around 60 MB/s.
 

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