Editing Duty cycle (section)

== Mark–space ratio ==
{{See also|Mark and space}}
'''Mark–space ratio''', or '''mark-to-space ratio''', is another term for the same concept, to describe the temporal relationship between two alternating periods of a waveform. However, whereas the duty cycle relates the duration of one period to the duration of the entire cycle, the mark–space ratio relates the durations of the two individual periods:<ref>{{Cite web|url=https://www.allaboutcircuits.com/tools/555-timer-astable-circuit/|title=555 Timer Astable Circuit|access-date=September 19, 2020}}</ref>

:<math>\text{mark–space ratio} = \frac{PW_\text{on}}{PW_\text{off}}</math>

where <math>PW_\text{on}</math> and <math>PW_\text{off}</math> are the durations of the two alternating periods.