Cirrus-logic CDB5461AU Uživatelský manuál stáhnout pdf (Strana 24)

CDB5461AU

24 DS661DB1

2.8.12 Frequency Domain Information

The following describe the indicators associated with FFT (Fast Fourier Transform) analysis. FFT data can be plot-

ted in the Data Collection window by setting the Time Domain / FFT / Histogram selector to FFT (Figure 14).

Figure 14. FFT Analysis

2.8.12.1 Frequency

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

2.8.12.2 Magnitude

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

2.8.12.3 S/PN

Indicator for the signal-to-peak noise ratio (decibels).

2.8.12.4 SINAD

Indicator for the signal-plus-noise-plus-distortion to noise-plus-distortion ratio (decibels).

2.8.12.5 S/D

Indicator for the signal-to-distortion ratio, 4 harmonics are used in the calculations (decibels).

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Cirrus-logic CDB5461AU Uživatelský manuál Strana 24