Campbell-scientific SDM-IO16 16-Channel Input/Output Expansion Module Manuale Utente Scaricare il pdf (Pagina 10)

SDM-IO16 16 Channel Input/Output Expansion Module

Minimum frequency: a frequency of 0 Hz is measured if there are

less than two high-to-low signal transitions in

the measurement interval.

Minimum pulse width: a pulse must stay high or low for a minimum

of 244 μsec for a change of state or pulse to be

counted.

Switch debounce timing: with the default settings a switch between the

input and G must remain closed for 3.17 msec

and then remain open for 3.17 msec, to be

counted as a closure2. The debounce time can

be changed from the user program.

Accuracy: internal clock accuracy ±0.01% (worst case)

over the standard temperature range of -25 to

+50°C. See also Appendix A for a discussion

on frequency resolution.

Duty cycle resolution: this depends on frequency and measurement

interval - See Appendix A. The average duty

cycle can be measured for signals up to 4 kHz.

Max measurement interval: for frequency or duty cycle measurements the

datalogger must request a measurement at an

interval no longer than 15.9375 seconds. Each

channel can be measured at different intervals,

both for frequency and duty cycle.

If more detailed input/output characteristics are required, experienced users

should consult the equivalent circuit diagrams shown in Figure 2.

See Appendix A for a more detailed discussion of switch debounce, resolution

and accuracy.

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Campbell-scientific SDM-IO16 16-Channel Input/Output Expansion Module Manuale Utente Pagina 10