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The SVT Gain and Phase VI measures the amplification and phase lag between the stimulus channel and the response channel at the test frequency. The SVT Gain and Phase VI identifies the detected tone amplitude and phase on the stimulus channel. The stimulus tone amplitude and phase are treated as references when specifying the tone relative amplitude and phase of the response channel. The SVT Gain and Phase VI searches for a response channel tone at the same frequency as the stimulus tone. The SVT Gain and Phase VI performs a dual-channel measurement that requires you to wire both stimulus and response signals. A single-channel measurement reads only the response signal.

You have the option of generating the excitation signal from the acquisition device, a separate output device, or an external source when the stimulus and response measurements are acquired. If you are using a dynamic signal acquisition (DSA) device, National Instruments recommends that you perform a dual-channel instead of a single-channel measurement when possible. Performing a dual-channel measurement takes full advantage of the interchannel gain mismatch and simultaneous sampling of the analog input channels. Refer to the DSA device specifications for more information. For example, in single-channel mode, the measurement uncertainty when using an NI PXI-4461 is 0.1 dB, whereas in dual-channel mode, the measurement uncertainty is typically 0.01 dB.