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Setting up National Instrument Multifunction Data Acquisition devices (NI-DAQ) to capture energy data

In addition to the Energy Probe, you can also use NI-DAQ devices to gather energy data from your target and view the results in Streamline.

To collect power statistics using a NI-DAQ device, you must have the following:

  • NI-DAQ hardware.
  • NI-DAQmx software installed on your host machine. This software package includes drivers for the NI-DAQ device.

    Note

    • If you are running on Linux, you must use the NI-DAQmx Base software. Currently, Red Hat Linux is the only type of Linux that the NI-DAQ device is supported on. Also, caiman must be built from source with Linux. Edit CMakeLists.txt and set SUPPORT_DAQ to 1, set NI_RUNTIME_LINK to 0, and verify the NI-DAQ install paths within CMakeLists.txt. See README.md located in DS-5_install_directory/sw/streamline/energy_meter/caiman/ for details.

    • All necessary software is available on the National Instruments website, http://www.ni.com.

To set up your NI-DAQ device, follow these steps:

Procedure

  1. Connect the Ai1 connections on the NI-DAQ device to go across the shunt resistor on your target.
  2. Connect Ai0 negative to ground.
  3. Also connect Ai GND to ground.
  4. Loop Ai0 positive to Ai1 negative.
    The Ai0 connectors are measured across the load, which is used to derive the voltage.

    Figure 10-6 Connections for NI USB-621x

    Connections for NI USB-621x

  5. Repeat steps 1 through 3 using the other connectors on the NI-DAQ device to measure additional channels.
  6. In the Streamline Data view, click Capture & Analysis Options.
  7. Select the NI-DAQ option from the Energy Capture drop-down menu.
  8. Enter a valid system name in the Device field.
    To get the system name of your National Instruments device, you must run the NI-DAQmx Base List Devices application, installed as part of the NI-DAQmx software package.
  9. Click the Select the energy capture tool button in the Tool Path field.
  10. Locate caiman in your DS-5 installation directory and select it.
  11. Click Open.
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