The step-by-step instructions will guide you through the process of changing the default loop back demo setup when using Q8-USB data acquisition device.

By default, the loopback demo is set for Q8 data acquisition boards. If you are using the Q8-USB DAQ device, the loopback demo needs to be re-set. Follow the steps below:

  1. Type “qc_show_demos” in the MATLAB command window
  2. Select the “QUARC Analog Loopback Demo”
  3. Click on “Open this model”:

  1. Double-click on the “HIL Initialize” block
  2. In the Board type scroll down menu, select “Q8-USB“. Press “Apply” and then “OK“

  1. On your Q8-USB DAQ device, connect Analog Output # 0 to Analog Input # 0 as illustrated below:

  1. Click on the “Signal Generator” block and in the Source Block Parameter window, change the amplitude to 4, then open the Scope

  1. Build and run the model. A sine wave should appear in the Scope window (see the picture in the previous step).

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