5 XF 95 series General COMPONENTS Measuring a square wave signal The square wave signal can be measured in the following ways using a multimeter: - With the multimeter in the duty cycle (%) position. In this way, the voltage level ratio is measured. - Multimeter in the DC voltage position. In this way, the average value of the supplied voltage is measured. 2 Square wave signals in the vehicle - Speed sensor output signal - Vehicle speed signal to electronic units 200303 1-5