Audio Analyzer Measurement Functions 4
Keysight U8903B User’s Guide 217
SNR (fast mode) measurement
SNR (fast mode) measurement is used to measure the ratio of signal amplitude over noise
amplitude. The SNR (fast mode) measurement is a frequency domain calculation. This
method is significantly faster than the standard SNR measurement, but it is not suitable for
measuring very high SNR. The noise measurement is made by notching out the
fundamental and harmonics from the frequency spectrum.
You can set the number of harmonics that will be removed in the computation. For
example, if the harmonics count is 1, the fundamental frequency will only be notched. If the
harmonics count is 3, the fundamental frequency and the first and second harmonics will
be notched for the calculation.
The SNR (fast mode) can be computed as follows.
SNR (fast mode) measurement function mode is applicable for the analog and Bluetooth
analyzer. The settings for SNR (fast mode) measurement are displayed as shown in
Figure 4-40 and Figure 4-41 for the analog and Bluetooth respectively.
Figure 4-40 Analog Analyzer > Functions > SNR (Fast) menu page 1
SNR 20 Log
10
rms value of signal
rms value of noise
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