5 XF 95 series General COMPONENTS 1.3 SIGNAL MEASUREMENTS Sine-wave signal (AC voltage) The signal regularly changes polarity with respect to the ‘0’ line Frequency The frequency is shown in Hertz (Hz). The number of complete sines per second is the frequency of the signal (3 Hz in the diagram). + 0 2 - Voltage If the number of sines per second increases, not just the frequency increases but also the voltage. + t 0 - 1 2 3 Measuring a sine wave signal The sine wave signal can be measured in the following ways using a multimeter: - With the multimeter in the frequency (Hz) position. In this way, the number of complete sines per second is measured. + 0 - Multimeter in the AC voltage position.
In this way, the average value of the supplied voltage is measured. - W 5 01 002 Sine wave signals in the vehicle - Wheel speed sensor output signal. - Engine speed sensor output signal. 200303 1-3