Introduction to Other Underutilized Functions
(1) Frequency testing
As long as the sensor can generate a frequency signal, it can be used for frequency testing with a multimeter. Such as intake pressure sensors and knock sensors. By fully utilizing the frequency testing function of the multimeter, the working status of the frequency signal sensor can be tested and the performance of the sensor can be judged.
(2) Duty cycle testing
Duty cycle is a numerical value that represents the percentage of signal operating time to total time. By using a multimeter to test the duty cycle of components such as the idle control valve that adopt the duty cycle control method, it can be determined that the idle control valve does not operate, operates , and operates inaccurately.
(3) Measurement of closure angle
Measurement of the closing angle can reveal the relevant reasons for ignition, such as the distance between the distributor contacts and mechanical wear of the distributor. The method is as follows: ① Insert the black probe into the COM socket and the red probe into the corresponding socket on the closed corner. ② According to the measured number of engine cylinders, place the function switch on the desired "DWELL" range. ③ Connect the black probe to the ground or the negative terminal of the battery, and connect the red probe to the low voltage terminal of the distributor or the negative terminal of the ignition coil. ④ Start the engine to read the closing angle.
(4) Special features should be well utilized
Some car multimeters have some unique functions, such as analog conversion modules (referred to as conversion modules), which have the functions of simulating sensor signals and driving actuators. If these functions are used properly, efficiency can be greatly improved.
Multimeters can also play many other roles in maintenance, and there is still much to be explored in practice. Only by constantly expanding and adopting new application methods in repair work can maintenance efficiency be improved.
