Automotive Multimeter function structure and the use of description – automotive knowledge, multimeter, engine – Automotive repair and maintenance industry
Automotive Multimeter Circuit 1, the functional requirements of automotive multimeter
In the engine electronic control system fault detection and diagnosis, in addition to often need to test voltage, resistance and current parameters, but also need to detect speed, dwell angle, bandwidth ratio (duty cycle), frequency, pressure, time , capacitance, inductance, temperature, and other semiconductor components. These parameters for the engine control system fault detection and diagnosis is important. But these parameters can not be used by most digital multimeter testing, needed special meter that auto multimeter. Automotive Multimeter general should have the following functions:
(1) measurement of AC and DC voltage. Taking into account the changes in voltage allows the scope and possible overload, automotive multimeter should be able to measure the voltage greater than 40V, but the measurement range can not be too large, otherwise the reading accuracy.
(2) measurement of resistance. 1M auto multimeter should be able to measure the resistance of larger measurement range more convenient to use.
(3) measuring the current. Automotive Multimeter should be able to measure more than 10A of current, measuring range and then use the convenient small.
(4) maximum and minimum memory. This feature is used to check a circuit transient fault.
(5) analog bar display. This function changes for continuous observation data.
(6) measuring the pulse shape bandwidth and the ignition coil than the closed one side of the current angle. This feature is used to detect fuel injector, Idle Stability Control valve, EGR solenoid valve and the ignition system is working.
(7) measurement of speed. (8) output pulse signal. This feature is used to detect non-distributor ignition system fault.
(9) Survey Sensor Output signal frequency.
(10) measured the performance of diodes.
(11) measuring large currents. Configuration current sensor (Hall Current Sensor folder), the can measure large currents.
(12) to measure temperature. After the temperature sensor configured to detect the cooling water temperature, exhaust gas temperature and intake air temperature and so on.
Current domestic production of automotive multimeter, such as "victory -98", Di Wei TWAY9206, TWAY9406A and EDA-230 and other models of cars multimeter has the features. Some automotive multimeter, in addition to the above basic functions, there are a number of extensions. For example, EDA-230 is equipped with cars Multimeter in a vacuum / pressure converter (annex), to measure pressure and vacuum, and it also has a backlit display (to display the data when in low light can be see clearly).
2, the basic structure of automotive multimeter
Automotive Multimeter mainly digital and analog display, function buttons, testing, project selection switch, temperature measurement seat hole, public seat hole (used to measure voltage, resistance, frequency, dwell angle, bandwidth ratio and speed, etc.) , Poor Ground Block hole Block holes and other current measurement form.
(1) auto range multimeter DC voltage: 400mV-400V (Accuracy ± 0.5%), (1000 ± 1%) v;
AC voltage: 400mV-400V (Accuracy ± 1.2%), (750 ± 1.5%) V;
DC current: (400 ± 1%) mA, (20 ± 2%) A;
AC Current: (400 ± 1%) mA, (20 ± 2.5%) A;
Resistance: (400 ± 1%) 0,4 K -4M (accuracy ± 1%), (400 ± 2%) M ;
Frequency: 4KHz-4kHz (± 0.05%), the minimum input 10Hz;
Diode test: Accuracy ± 1% dgt; Off the audio signal circuit test;
Measure detection :18-300 (Accuracy ± 3 ) ,301-1100 (Accuracy ± 3%);
Speed :150-3999r / min (precision ± 0.3%) ,4000-1000Or / min (precision ± 0.6%);
Closed angle: ± 0.50;
Bandwidth than: ± 0.2%.
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