Cirrus Logic CDB5451A - Manual (Page 19)

CDB5451A
DS458DB3 19
3.2.8 Frequency Domain Information
The following section describes the indicators as-
sociated with Fast Fourier Transform (FFT) analy-
sis. FFT data can be plotted in the Data Collection
Window by setting the Time Domain / FFT / Histo-
gram selector button to “FFT.”
3.2.8.1. Frequency
Displays the x-axis value of the cursor on the FFT
display.
3.2.8.2. Magnitude
Displays the y-axis value of the cursor on the FFT
display.
3.2.8.3. S/D
Indicator for the Signal-to-Distortion Ratio, 4 har-
monics are used in the calculations (decibels).
3.2.8.4. SINAD
Indicator for the Signal-to-Noise + Distortion Ratio
(decibels).
3.2.8.5. SNR
Indicator for the Signal-to-Noise Ratio, first 4 har-
monics are note included (decibels).
3.2.8.6. S/PN
Indicator for the Signal-to-Peak Noise Ratio (deci-
bels).
3.2.8.7. FS-PdB
Not using windowing, how far down from zero the
peak voltage input value is (decibels).
3.2.9 Histogram Information
The following is a description of the indicators as-
sociated with Histogram Analysis. Histogram can
plotted in the Data Collection Window by setting
the Time Domain / FFT / Histogram selector to
“Histogram.”
3.2.9.1. Bin
Displays the x-axis value of the cursor on the His-
togram.
3.2.9.2. Magnitude
Indicator for the maximum value of the collected
data set.
3.2.9.3. Mean
Average value of the collected data set.
3.2.9.4. Variance
Indicator for the calculated variance of the collect-
ed data set.
3.2.9.5. STD_DEV
Indicator for the calculated standard deviation of
the collected data set.
3.2.9.6. Maximum
Indicator for the maximum value of the collected
data set.
3.2.9.7. Minimum
Indicator for the minimum value collected in the
data set.