Campbell-scientific SDM-INT8 8-Channel Interval Timer Manuel d'utilisateur télécharger pdf (Page 36)

Appendix B. Processing Time Limitations

If the T

for Output Option XXXX is greater than the specified interval, the

extra time will be added to the execution time of Instruction 101.

Example 1

Given

Output Option = XXXX

Specified interval = S = 500 ms

Function = frequency (Function 2)

Number of channels measured = N = 6

Average input frequency = F = 1kHz

Find

: Total Processing Time, T

Solution

= T

+ΣT

= T

= 0.511*S+E

*(.034+.010*N) +0.015*E

= 583 ms

S = 500 ms

N = 6

= N * S * F = 3000

= E

= 3000

In this case 83 ms is added to the execution time of Instruction 101.

Example 2

Given

: N = number of channels measured

F = Frequency of input signal, kHz

Function = frequency (Function 2)

Output Option = 0 or 0--

Find

: Maximum average frequency, F, at which the processing time is ≤ the

measuring/storing time.

Solution

must be ≤ to S;

≤S

0.511*S +E

*(.034+.010*N) + 0.015*E

≤ S

Note: E

= E

= N*F*S

0.511*S+N*F*S*(.034+.010*N)+

0.015*N*F*S≤S

F<.489/(N*(.049+.01*N))

Results for the above example using all Functions is presented in TABLE 2,

Section 5.4.1

B-2

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 42

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