Campbell Scientific SDM-IO16 16-Channel Input/Output Expansion Module - Manual (Page 38)

Appendix A. General Principles of Pulse and Frequency Measurements
A-4
The relationship between the minimum debounce time in milliseconds (t
d
) and
the debounce parameter (n) is:
t
d
= 0.244 + n * 0.244
The relationship between maximum frequency (f
max
), debounce time and total
switch bounce time (t
b
) in milliseconds is:
f
max
= 1000 / (2 * (t
d
+ 2 * t
b
))