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如何使用万用表进行高级测量

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How to Make Advanced Measurements With a Multimeter, How to measure low current (mA scale): crwdns2935265:00crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 How to Make Advanced Measurements With a Multimeter, How to measure low current (mA scale): crwdns2935265:00crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
How to measure low current (mA scale)

  • Power down the circuit you're measuring.

  • Choose the point where you want to measure the current. You'll need to break the circuit at that point. This may mean snipping a wire, disconnecting a connector, or removing a connecting jumper wire.

  • Connect the multimeter in-line with the circuit by touching the probes to the ends of the broken circuit. If possible, use alligator clips to hold the probes to the ends.

  • The polarity of the probes somewhat matters. The multimeter will measure current flowing into the red probe and out the black probe. If you reverse the probes, it will show a negative value on the multimeter, but it won't damage the meter.

  • Confirm that the probes are only touching what they should and nothing else.

  • Make sure the circuit isn't accidentally touching you or anything conductive that may short it.

  • Power on the circuit and make your measurement.

如何测量小电流（毫安量程）

关闭被测电路电源。

在目标测量点断开电路连接，操作方式包括剪断导线、断开连接器或移除跳线。

将表笔接触断开的电路两端以形成串联回路。建议使用鳄鱼夹固定表笔。

注意 表笔极性：万用表将测量从红色表笔流入、黑色表笔流出的电流。若反接表笔，万用表会显示负值，但不会损坏设备。

确认表笔仅接触目标测量点，避免误触其他部位。

检查电路是否意外接触人体或导电物体，防止短路。

重新接通电路电源后进行读数。

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