IMC CANSAS - Page 203

Measurement modes 203
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
5.1.3.3.3 PWM
Pulse width modulation (PWM) is a type of modulation in which a technical variable (e.g. electrical
current) switches between two values. In the process, the duty cycle ratio is modulated at constant
frequency.
PWM is also known as pulse duration modulation (PDM).
A good illustration of this modulation type would be a switch used to continually switch a heater on and
off. The higher the ratio of the on-time to the off-time, the higher the average heating power is.
PWM settings dialog
Give the PWM emitter a fixed frequency. As part of PWM measurement, a time measurement is carried
out. In every sampling interval, the duration from the first increasing slope to the next decreasing slope is
determined. This pulse duration is compared to the period duration, resulting in a value between 0 and
100%.
On the Scaling page, you set how the percent value is interpreted:
PWM: Scaling dialog