Figure 5-7 Thd + N Level Measurement - Agilent Technologies U8903A User Manual

U8903A User's Guide
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.
THD + N Ratio = 20 log
The THD + N Ratio is expressed in dB (default) or as a
percentage.
Audio Analyzer Measurement Functions

rms value of noise and distortion
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
rms value of signal, noise, and distortion
5


95