Audio Analyzer Measurement Functions
5
Keysight U8903A User’s Guide
119
The following figure shows the THD + N Level measurement.
Figure 5-7
THD + N Level measurement
The THD + N Ratio is defined as the ratio of the square root of the sum of the
squares of all the signal harmonic components and noise amplitude, relative to
the total signal amplitude. The THD + N Ratio can be computed as follows.
The THD + N Ratio is expressed in dB (default) or as a percentage.
THD + N Ratio = 20 log
rms value of noise and distortion
rms value of signal, noise, and distortion
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Summary of Contents for U8903A
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