You are here: NI Home > Support > Product Reference > Manuals > Sound and Vibration Measurement Suite 6.0 Help

A dynamic range measurement quantifies the distortion and noise found in the device under test (DUT) output when a low-level signal is provided. Typically, the dynamic range is measured with the amplitude of the excitation signal set to –60 dB FS, where FS is the DUT input channel full-scale amplitude.

The following illustration shows the connection scheme for a dynamic range measurement.

Configure the measurement by specifying the measurement settings in the SVXMPL_Settled Dynamic Range (DAQmx) example VI, which is located in the labview\examples\Sound and Vibration\Audio Measurements directory.

You must enable the propagation delay of the DAQ or DSA device. This delay is specific to the device used to perform the measurement. To determine the device propagation delay, refer to the device documentation or measure the delay with the SVL Measure Propagation Delay (DAQmx) VI.

The SVXMPL_Settled Dynamic Range (DAQmx) example VI performs a continuous generation and acquisition. The measurement continues until the measured dynamic range is settled according to the tolerances specified on the Settling Parameters page. For the left channel of this DUT, a two-channel audio equalizer, a typical measurement configuration results in a dynamic range of 83 dB FS, 20 Hz–20 kHz, test amplitude –60 dB FS, test frequency 1.0 kHz, and unity gain.

The following front panel shows the final measured spectrum for the dynamic range measurement.