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Single-tone measurements refer to a group of measurements where the excitation is a single tone. These measurements often are used to measure the linear response, nonlinear distortion, and noise of audio devices. These measurements fall into two broad categories, single-channel and dual-channel measurements.

Examples of single-channel measurements are measurements of gain, idle-channel noise, dynamic range, and spurious-free dynamic range. Single-channel measurements do not require that the excitation signal be connected to an input channel of the acquisition device. The following illustration shows the connection scheme for single-channel measurements.

Examples of dual-channel measurements include measurements of gain, phase, and crosstalk. Dual-channel measurements require that the excitation signal be connected to one of the input channels, as shown in the following illustration.

Typically, you know the frequency and amplitude of the excitation signal. The real advantage of connecting the excitation signal to one of the input channels is the ability to measure the relative phase between the stimulus and response signals. In a two-channel measurement configuration the input channel connected to the excitation signal is the stimulus channel, and the input channel connected to the output of the device under test is the response channel.

Use the Single Tone Measurement VIs to perform single-tone measurements.

Use the Tone Measurements Express VI and the Noise Measurements Express VI to develop and interactively configure single tone and noise measurements.