3/2/2023 0 Comments Sound siphon ni![]() ![]() Once in NI Example Finder, browse to the Sound and Vibration examples by selecting Toolkits and Modules » Sound and Vibration » Acoustic » Sound Level Meter (DAQmx).vi. You can find examples for your device from any LabVIEW window by selecting the following: Help » Find Examples. Once you have configured the system properly, you can acquire and visualize data using the LabVIEW graphical programming environment. LabVIEW Example for Measuring Sound Pressure You also have the option of saving your NI-DAQmx Global Virtual Channel should you wish to refer to this configuration screen again in the future. You can choose to view the signal in tabular form or as a graph by selecting Graph from the Display Type pull-down menu. You see the sound pressure value of your measurement displayed at the top of the screen.įigure 5. Testing the virtual channel in MAX. With MAX still open, click back on the NI-DAQmx Global Virtual Channel tab and click on the Run button. Click the Device tab and choose your Coupling Mode (AC or DC).dB Reference is expressed in the selected engineering units. This is the reference value used when results are computed in decibels. You can choose Differential or Pseudodifferential, depending on your device (see above). Terminal configuration specifies the grounding mode used for the virtual channel. Specify the excitation value (Iex Value (A)).None-Supply no excitation to the virtual channel.Internal-Use the built-in excitation source of the device.External-Any excitation source other than the built-in excitation source of the device.Select the source of excitation (Iex Source):.Refer to sensor documentation to determine this value. This value is in the units you specify with the sensitivity units input. ![]() Type in the sensitivity value of the sensor.On the Settings Tab, type in the Max Level (dB) value you expect to read from your microphone (100 dB by default).Select Acquire Signals✺nalog Input»Sound Pressure.Select NI-DAQmx Global Virtual Channel and click Next.With MAX open, select Data Neighborhood and click Create New.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. Using an NI-DAQmx Global Virtual Channel, you can configure a microphone measurement without any programming. You can use MAX to quickly verify the accuracy of your measurement system setup. To minimize ground noise, keep the metal shells of the connectors from touching each other, the DSA device(s), or the chassis/computer. The shell of the connector, AI-, provides the excitation return path and the signal ground reference. The center pin of the connector, AI+, provides the DC excitation, when enabled, and the positive input signal connection. NI DSA devices use BNC or SMB connectors. The next step is to physically connect the microphone to your DSA device. An IEPE sensor needs an appropriate cable and/or connector to hook into the BNC inputs of the C Series module. ![]()
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