Campbell Scientific SDM-INT8 8-Channel Interval Timer User Manual

Page 37

Appendix B. Processing Time Limitations

Example 3
Given:

N = number of channels measured

F = Frequency of input signal, kHz

Function = frequency (Function 2)

Output Option = XXXX with specified sampling interval, S

Find: Sampling interval, S, such that the number of unprocessed events is

≤

8000

Solution: The interval required to process 8000 events after the sampling

interval is Tt-S, therefore;

(Tt-S)*F*N≤8000

≥Tt-(8000/(F*N))

≥(0.511*S+Et*(.034+.010*N)+0.015*E2)

-(8000/(F*N))

Note:

E2 = Et = N*F*S

≤8000/[F*N((0.511+N*F*(0.49 +.01*N))-1)]

Results for the above example are presented in Table 3, Section 5.4.1

B-3