Duty Cycle

Displaying Duty Cycle using a Pico Scope

Some newer vehicles employ digital pedal position sensors which can be utilised by the module without any further processing of the signal, unlike analogue sensors.

The sensor output is a fixed frequency variable duty signal.

The signal switches on and off very quickly, (frequency) with the on time variable (duty cycle) that is directly proportional to the position of the pedal which is impossible to interrupt using a multi-meter and even with a ‘scope it can be tricky.

The problem is checking the smooth transition from the idle position to wide open throttle.

The use of a maths channel to display duty cycle is very useful and not that difficult with some practice.

The video below demonstrates how to do build a maths channel to display the duty cycle on the ‘scope.

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