Digital multimeters are a common portable testing tool that makes digital multimeters a very effective tool for diagnosing electrical and electronic system failures, even for highly electronic Hyundai vehicles. The most commonly used function of the DMM is to measure the resistance during system troubleshooting.
Under certain operating conditions, many system components, such as sensors, actuators and so on, have specified resistance values. By measuring the resistance between the corresponding terminals of each component, it is possible to determine whether there is a fault in the components. Can also use the resistance of the multimeter file, measuring electrical switches in different stalls when the corresponding terminals on-off situation, to determine the working status of the switch is normal; the use of multimeter resistance file to the connector on both sides of the same jack The resistance is measured to determine whether the contact of the connector is reliable or not; the resistance of the multimeter is used to measure the resistance between the two ends of the contact under the condition that the contact of the relay is closed, so as to judge whether the contact of the relay is ablated or dirty ; The use of multimeter resistance file on the diode and other electronic components on-off check to determine the appropriate electronic components are normal; the use of multimeter resistance file, the system components of the relevant terminals and ground resistance between measurements to To determine whether the parts of the ground situation is normal.
Another common function of digital multimeter is to measure the voltage, voltage by measuring the way, check the car circuit and system components working conditions are normal. For example, under certain operating conditions, by detecting the voltage between the terminals of the automotive computer control module connector and the ground terminals, the electrical circuits related to the control module and the control module itself are judged to be normal; under certain operating conditions, Measure the voltage between the signal terminal of the sensor and the ground terminal to judge whether the sensor is normal or not; when the actuator can not work normally, judge the electrical circuit and the actuator itself related to the actuator by measuring the voltage between the input and output terminals of the actuator Is it normal?
In addition to the above functions, digital multimeter can also be used to measure current, frequency, period, time interval, transistor parameters. When using digital multimeter should be noted that, despite the digital multimeter anti-overload ability, at each measurement, you should first determine the range is appropriate. If you do not know the size of the measured parameters, you must first start from the high. After confirming the availability of low-grade measurement, and then converted to the corresponding low. When measuring resistance, you must first cut off the power of the resistance being measured, never by measuring resistance. In addition, digital multimeter, after all, is a simple instrument, the need to read the computer control module inside the relevant information, or observe some of the signal voltage waveform, usually with the help of a dedicated scan detector or oscilloscope.