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

As an alternative to the Energy Probe, you can use a NI DAQ device 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. You must use the NI-DAQmx Base software on Linux.

In addition, you must set the location of the appropriate caiman application using the Tool Path field in the Capture & Analysis Options dialog box. If the pre-built caiman executable that is distributed with Streamline is insufficient, or you want to change some options, you can re-build caiman from source. For example, to build a NI DAQ enabled version of caiman for Red Hat Enterprise Linux 6, you first need to set the following values in CMakeLists.txt:

  • SUPPORT_UDEV 0.
  • SUPPORT_DAQ 1.
  • NI_RUNTIME_LINK 0.

Also, verify the NI DAQ install paths within CMakeLists.txt.

See README.md located in DS-5_install_directory/sw/streamline/energy_meter/caiman/ for more details about setting up NI DAQ and running caiman.

See the National Instruments website, http://www.ni.com for the list of operating systems supported by NI DAQ.

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 either the pre-built caiman in your DS-5 installation directory, or the modified version that you built from source, and select it.
  11. Click Open.
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