Before connecting any signals, locate your device pinout.
An IEPE sensor needs an appropriate cable and/or connector to hook into the BNC inputs of the C Series module. Triaxial accelerometers have three outputs, one axis to one acquisition channel, each requiring its own signal conditioning.The next step is to physically connect the accelerometer to your DSA device. NI DSA devices use BNC or SMB connectors. The center pin of the connector, AI+, provides the DC excitation, when enabled, and the positive input signal connection. The shell of the connector, AI-, provides the excitation return path and the signal ground reference. To minimize ground noise, keep the metal shells of the connectors from touching each other, the DSA device(s), or the chassis/computer.
You can use MAX to quickly verify the accuracy of your measurement system setup. Using an NI-DAQmx Global Virtual Channel, you can configure an accelerometer measurement without any programming. A virtual channel is a concept of the NI-DAQmx driver architecture used to represent a collection of device property settings that can include a name, a physical channel, input terminal connections, the type of measurement or generation, and scaling information.Follow these steps to begin:
With MAX still open, click back on the NI-DAQmx Global Virtual Channel tab and click on the Run button. You see the acceleration value of your measurement displayed at the top of the screen.
Once you have configured the system properly, you can acquire and visualize data using the LabVIEW graphical programming environment.
You can locate examples for your device by clicking Help in LabVIEW Toolbar»Find Examples. Once in NI Example Finder, there is a pull-down menu in the bottom left-hand corner where you can pick your specific module. When you have chosen your module, check the Limit Results to Hardware box. Now all relevant examples for your module are shown.
With the Level Meter (DAQmx).vi shown below, you can continually acquire data from the specified channel. The data is scaled to engineering units. The energy content of the signal is then measured using three different methods:A. Compute the power spectrum and then find the power in bandB. Compute the RMS level of the signalC. Compute the running RMS level of the signal
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