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Usage of multimeter

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In this lesson, we mainly learn about the types and installations of multimeters

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Multimeters are also called multiplexers because they have more functions to measure

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Multimeter is an indispensable tool in circuit board maintenance

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According to the display mode,

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the multimeter can be divided into pointer multimeter, digital multimeter

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In daily maintenance, most of the digital multimeters are used

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Because the digital multimeter displays clear values,

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it is easy to watch

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The pointer multimeter relies on the pointer to swing,

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and the value is not intuitive enough

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Most of the early maintenance personnel used it

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Digital multimeters are divided into manual range multimeters and automatic range multimeters

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Manual range refers to the need to adjust the range when measuring

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The automatic range multimeter does not require us to adjust the range,

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it will automatically identify the range

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Multimeters are frequently used in maintenance

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We can use a multimeter to measure line voltage, line connection,

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diode value, and the quality of electronic components, etc.

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The composition of the multimeter

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The new multimeter includes a complete set of accessories,

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including the multimeter, batteries,

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and measuring markers

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Some multimeters have a temperature measurement function,

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and the accessories also include a temperature measurement line

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Let's take a look at the real thing

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In the picture are two digital multimeters,

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the one on the left is a manual range multimeter,

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and the one on the right is an automatic range multimeter

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The measurement range of the automatic range multimeter is automatically recognized

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Manual range multimeter,

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we need to select the appropriate range according to the size of the component

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If the range selection is wrong,

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it will marker to the inability to judge whether the components are good or bad

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When the multimeter is in use,

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it is necessary to install the battery and test markers first

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Let me take VC890D multimeter as an example to demonstrate

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Let's open the battery cover on the back of the multimeter first,

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we can see the buckle of the battery

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This multimeter uses a 9V battery

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We connect the positive and negative poles,

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put in the battery, and buckle the battery protection cover,

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so that the multimeter can be used normally

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It is also necessary to install test markers during measurement,

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which can be directly installed in the multimeter test marker jack

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When repairing mobile phones,

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it is necessary to use the test markers with fine needle points

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Because the components of the mobile phone are relatively small,

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if the test marker is too thick,

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it will cause a short circuit during measurement,

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resulting in damage to the mainboard

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Generally, the black test marker is inserted into the COM socket,

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and the red test marker is inserted into the red socket

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After the test markers are installed,

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we can measure components, measure voltages, etc.

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Ok, that's it for this lesson