How To Measure Frequency
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Apply power to the circuit. Set the rotary dial of the DVOM to the V (AC) position. Connect the positive lead of the DVOM to the circuit to be tested. Connect the negative lead of the meter to a good ground. Press the Hz button on the meter. The DMM will display the frequency measured.
Measuring frequency is a very important part of diagnosing the ABS system, Vehicle Speed Sensor (VSS), knock sensors, etc.These systems use a frequency signal back to it's computer for input data and control parameters.