Cirrus-logic CS5550 Manuel d'utilisateur télécharger pdf (Page 16)

CDB5550

2.6 Frequency Domain Information

The following describes the indicators associated with FFT (Fast Fourier Transform) Analysis. FFT data

can be plotted in the Data Collection Window by setting the Time Domain / FFT / Histogram selector to FFT.

Figure 10 illustrates a typical Frequency Domain plot.

Figure 10. CDB5550 Frequency Domain Plot

2.6.1 S/PN

Indicator for the Signal-to-Peak Noise Ratio (decibels).

2.6.2 SINAD

Indicator for the Signal-to-Noise + Distortion Ratio (decibels).

2.6.3 S/D

Indicator for the Signal-to-Distortion Ratio, 4 harmonics are used in the calculations (decibels).

2.6.4 SNR

Indicator for the Signal-to-Noise Ratio, first 4 harmonics are not included (decibels).

2.6.5 FREQUENCY

Displays the x-axis value of the cursor on the FFT display.

2.6.6 MAGNITUDE

Displays the y-axis value of the cursor on the FFT display.

2.6.7 # of AVG

Displays the number of FFT’s averaged in the current display.

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Cirrus-logic CS5550 Manuel d'utilisateur Page 16