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Usage of multimeter

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In this video, we mainly explain the functions of the multimeters

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Let's take the commonly used manual range multimeter VC890D as an example to explain

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The top position is the sound alarm indicator light

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For example, when measuring the connection of the line,

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there will be a sound of wind, and the sound is emitted from this position

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Below the indicator light is a display screen,

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which will display the measured voltage, value, etc.

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Below the display screen is the triode jack,

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the main function is to judge the polarity of the triode

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Data hold backlit function key, which is a 3-in-1 button

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When measuring, the measured value can be locked,

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the screen can be lit,

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and it can also be used to switch between different ranges

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The mark F is the capacitor range,

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which is specially used to measure the capacitance value of the capacitor,

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and can judge whether the capacitor is good or bad

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The resistance range is marked with the symbol of ohm,

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which is specially used to measure the quality of the resistor

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Diode/ buzzer range, this is a two-in-one range

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But in some multimeters, these two ranges are separated

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When measuring the connection of the line, use the buzzer range;

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when measuring the quality of the component or measuring the value of the diode,

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use the diode range

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AC current range,

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which is specially used to measure AC current,

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the range ranges from 20mA to 20A

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DC current range,

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which is specially used to measure DC current,

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the measurement range is from 200uA to 20A

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The switch mark is OFF

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When the button is rotated to OFF, the multimeter is turned off

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Flashlight switch button,

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VC890D integrates the flashlight function

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When we turn it on, the flashlight on the back turns on

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The triode mark HFE,

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this range should be used in conjunction with the upper triode socket,

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it is specially used to judge the polarity of the triode

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The DC voltage range is used to measure DC voltage,

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and the measurement range is from 200mV to 1,000V

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The range selection knob,

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which range the arrow is pointing at,

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indicating which range is currently adjusted

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AC voltage range,

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specially used to measure AC voltage,

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its measurement range is from 2V to 750V

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For example, when we measure domestic sockets,

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we need to adjust to the range of 750V

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Voltage sensing range NCV

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Turn the multimeter to the NCV position, and the top is close to the power line

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If the power line has power supply,

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the multimeter will emit a beep alarm sound

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Here are the test jacks

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When we use different functions, we need to choose different jacks

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The black jack is the public port,

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after the black marker is inserted, there is no need to move it

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When measuring voltage, insert the red marker into the ohm identification jack

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The two jacks on the left are current jacks,

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and the red markers need to be inserted into the jacks when measuring the current

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Ok, that's it for this lesson