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How to select a automobile digital multimeter?

Last Update Time: 2019-03-08 11:31:34

1.Select method.

 In order to meet the needs of the measurement of the various functional parameters of the car, In addition to voltage, resistance, current, diode performance, circuit on-off (using buzzer block), automatic shutdown, low voltage display, over-range (overload) display, automatic display type of measurement, the selected digital multimeter is required to have voltage, resistance, current, diode performance, circuit on-off (using buzzer block), automatic shutdown, low voltage display, In addition to functions such as auto-display polarity, Also has the engine speed, the breaker contact close angle, the frequency, the duty cycle, the temperature, the pressure and so on detection function.

2. Select specific requirements for each functional block.

The specific requirements for each function block of the selected digital multimeter are shown in Table 3-2 for reference when selecting the appropriate digital multimeter.

Table 1 Specifies the specific requirements for each functional block of the digital multimeter selected for the vehicle.

Serial number

Measurement function

Specific request description

1

Resistance measurement

Choose the car digital multimeter to be able to   measure the resistance around the 2MΩ and the measurement range is as large   as possible.

2

Current measurement

Choose a car digital multimeter to be able to measure   current greater than 10A and measure as much as possible.

3

Ac and DC voltage measurement

The selected automobile digital multimeter should be   able to measure voltages greater than 48V, but the measurement range should   be controlled not to be too large in case the measurement accuracy is   reduced.

4

Measurement of rotational speed and output pulse   signal.

The selected automobile digital multimeter should   have the function of measuring rotational speed and output pulse signal in   order to conveniently measure the fault of ignition system without   distributor.

5

Duty cycle, closure angle measurement

The selected digital multimeter should have the   function of duty cycle (frequency-width ratio) and close angle measurement,   which is convenient to measure the duty cycle of pulse waveform and the   closing angle of primary current of ignition coil.

6

Maximum value, minimum value memory

Choose the automobile digital multimeter to have the   maximum value, the minimum value memory function, uses to carry on the   inspection to the circuit instantaneous bad fault.

7

Analog bar display function.

The car digital multimeter selected should have the   analog bar display function for observing data of continuous changes.

8

Temperature measurement

The automobile digital multimeter selected shall have   the function of temperature measurement so that the cooling water   temperature, intake air temperature, automobile exhaust temperature and so on   can be measured in conjunction with the temperature sensor.

9

Frequency measurement

The selected automobile digital multimeter shall have   a frequency measurement function to facilitate the measurement of the   frequency of the output signals of various   sensors.

10

Pressure measurement

The selected automobile digital multimeter should   have extended pressure measurement functions (e.g., EDA- 230 automobile   digital multimeter, etc.) to facilitate the measurement of air pressure,   vacuum, etc., in conjunction with vacuum / pressure   converters.

 

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