Campbell CR23X Spécifications Page 127

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SECTION 8. PROCESSING AND PROGRAM CONTROL EXAMPLES
8-17
TABLE 8.11-2. FFT Magnitude and Phase Results 0.25 and 1.25 Hz Signal
BIN # Hz FFT Mi FFT Pi
0 0 0.02303 0
1 0.009766 0.01036 0
2 0.019532 0.00206 180
3 0.029298 0 -99999
22 0.214852 0.00086 185.58
23 0.224618 0.01154 17.952
24 0.234384 0.20321 197.78
25 0.24415 0.62935 17.776
26 0.253916 0.69215* 197.79*
27 0.263682 0.28158 17.801
28 0.273448 0.02592 197.68
29 0.283214 0.00092 21.646
125 1.22075 0.00069 90
126 1.230516 0.04342 270.11
127 1.240282 0.23044 89.979
128 1.250048 0.37302* 270*
129 1.259814 0.23053 90
130 1.26958 0.0435 269.89
131 1.279346 0.00061 82.042
511 4.990426 0.00009 180
TABLE 8.11-3. FFT Power Spectra Results
0.25 and 1.25 Hz Signal
BIN # Hz FFT PSi
0 0 1.0859
22 0.214852 0
23 0.224618 0.49212
24 0.234384 84.152
25 0.24415 811.01
26 0.253916 980.79*
27 0.263682 162.4
28 0.273448 1.4764
29 0.283214 0
125 1.22075 0
126 1.230516 3.9369
127 1.240282 108.76
128 1.250048 284.94*
129 1.259814 108.76
130 1.26958 3.9369
131 1.279346 0
511 4.990426 0
PROGRAM
;The first part of this program generates a
;dummy data set that represents two signals
;superimposed on top of each other. One signal
;has a frequency of 1.25 Hz and a zero to peak
;amplitude of 1 while the other signal has a
;frequency of .25 Hz and a zero to peak
;amplitude of 2. The data simulates a sampling
;rate of 10 Hz or a .1 sec scan rate.
;This program generates power spectra FFT
;results with out bin averaging.
;Flag 1 is automatically set once the inst. have
;been executed once.
*Table 1 Program
01: 1 Execution Interval (seconds)
01: If Flag/Port (P91)
1: 11 Do if Flag 1 is High
2: 0 Go to end of Program Table
;The 2nd through 11th instructions are used to
;generate and combine the 1.25 and 0.25 Hz
;signals for the FFT.
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