Casio E-Con EA-200 Referensi Teknis - Halaman 11
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<<FFT>>
Frequency characteristics are calculated from sampled values and sampling
period.
The number of FFT target data items (2^n) is input to parameter n.
1-13 (2^13 = 8192)
Calculation Timing
When data is requested
Sent Timing
• When 1 (d/dt)
After sampled data is sent, linear data is sent when data is requested.
• When 2 (d/dt, d
2
/dt
2
)
After sampled data is sent, linear data is sent when data is requested.
In addition, quadratic data is sent when data is requested.
• When 10 and 11 (FFT)
After sampled data is sent, FFT real number part data is sent when data is
requested.
In addition, FFT imaginary number part data is sent when data is requested.
Period Frequency Sampling
{ 1, Channel, Operation, Pin No, Trigger Threshold, Trigger Edge }
(Operation 5, 6, 11)
Compares 12-bit D/A thresh and sampled data, and measures the pulse interval.
Time resolution is 0.868 µ sec.
Read either of two pins → Set by sampled pin number
4 pulse interval types → Set by trigger edge
4. Pin No
Specify the pin number for reading the period frequency.
2
1pin Vin
10V
10 6pin Vin-low 0–5V
5. Trigger Threshold
Threshold voltage value for comparison with sampled values.
6. Trigger Edge
• Period, frequency sampling (Operation= 5, 6)
0 Rising-Rising
1 Falling-Falling
2 Rising-Falling
3 Falling-Rising
• Time (Operation = 11)
0 Rising
1 Falling
2 Both (Rising and Falling)
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