5
Audio Analyzer Measurement Functions
124
Keysight U8903A User’s Guide
The SMPTE IMD value is computed as the ratio of the sum of the intermodulation
harmonics amplitude to the upper frequency tone amplitude.
Refer to
on page 98 for information on
generating dual tones for this test.
The SMPTE IMD measurement is shown as follows.
Figure 5-12
SMPTE IMD measurement
Difference frequency distortion (DFD)
The DFD measurement is similar to SMPTE IMD, except that the two tones in the
stimulus signal are of equal amplitude and are spaced closer to each other
(typically 19 kHz and 20 kHz). This measurement also allows you to select either
the second or third order intermodulation distortion.
Summary of Contents for U8903A
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