当您处理电路和设备时，万用表是必备设备。但是，没有多少人容易熟悉万用表。这是因为有太多的符号和按钮可以使用。它有时会令人困惑，这将阻止您正确使用设备并获得准确的结果。在本文中，我们将解释万用表的所有符号，以便您可以正确操作设备。
大纲
什么是万用表？
一个multimeter is an electronic device to measure all the different parameters of electricity. An electrician使用万用表to check different aspects of electric circuits and appliances. The different aspects includemeasurement of current在放大器中，电压和电阻ohm meter。
There are two types of multimeters available in the market;模拟和数字万用表。数字多项式更受欢迎，因为它们在阅读方面更准确。万用表的主要四个组成部分。
- 显示屏您可以看到测量值。
- Buttonsto operate the device.
- Rotary Dialto select the measurement unit.
- Input Portsto insert the test leads, which conduct the testing.
万用表的单位是什么？
如果您是第一次使用万用表，那么您一定会吓坏。即使它测量了电流，电压和电阻，您也不会在任何地方找到关键字。这些关键字分别通过其单位（amp），v（volt），ω（ohm）表示。这些单元还具有子单元，以更有效地表示测量。子单元如下 -
- K for kilo，，，，which means 1000 times.
- M适合Mega或百万，，，，which means 10,00,000 times.
- M为Milli，这意味着1/1000。
- (µ) for micro，，，，which means 1/million.
如何在万用表上读取符号？
标准的万用表带有以下符号。
1.按钮
读取读数后，当需要将测量值保留在屏幕上时，请按按钮。如果您不按按钮，则一旦您从要测试的对象中删除测试引线后，测量值就会从屏幕上消失。当您想根据您的要求在屏幕上看到一段时间的测量值时，这很有用。
2.最小/最大按钮
此按钮可节省数量使用过程中测量的最小值和最大值。一旦当前测量超过节省的最小值/最大值，标准的万用表将蜂鸣。在某些数字多项式中，屏幕显示最小/最大值以及当前测量值。
3.范围按钮
一个multimeter comes with different ranges of measurement. With this button, you can make changes from the current range to pre-set others as per the availability. It depends on the objects you are testing, whether you need a narrow or a wide range.
4.功能按钮
您按此按钮需要激活拨号符号的辅助功能。您将看到围绕拨号符号的这些功能，这些功能以黄色文本突出显示。实际上，万用表上的黄色按钮是功能按钮，并且可能并不总是带有标签读取“函数”。
5.交流电压
该符号由Capital V代表带有波浪线的线，代表电压。当您要测量对象的电压时，您必须将拨号移至此符号。测量交流电压时，应该使用它。
班次：赫兹
就在V符号旁边，您会注意到黄色的Hz符号。如前所述，这是一个辅助功能，您可以通过按功能按钮来使用它。该符号测量赫兹单元中对象的频率。
6. DC Voltage
Represented by capital V with three hyphens and a straight line on top, the symbol stands for voltage. Simply move the dial to this symbol when you want to measure the voltage of the object. You should use it when you are measuring DC voltage.
7. AC Millivolts
该符号由MV代表三个连字符和一条直线，符号代表毫升。仅当您测量非常低数量的交流电压（最好在较小的电路中）时，才能使用它。
SHIFT: DC Millivolts
通过将拨号点保持在AC毫伏符号上并按下功能按钮，您可以测量较小电路的直流毫伏洛尔特。它的符号位于带有黄色的MV符号旁边。
8. Resistance
该符号代表ω（欧米茄）代表电阻。当您想测量对象的电阻时，您需要将拨号移至此符号。它的次要功能还可以帮助您找出保险丝是否完整。
9.连续性
Represented by sound wave symbol, its function is to determine whether there is continuity between two points or not. Therefore, you can determine whether there is an open or short circuit. It is a very important function while finding fault in the circuit and troubleshooting.
10. Diode Test
Just beside the continuity symbol, you will find an arrow symbol with a plus sign. To use this symbol, you have to point the dial to the continuity symbol and press the function button. This symbol helps to find out whether a diode is good or bad.
11. AC Current
Represented by capital V with a wavy line on top, the symbol stands for current. You should use it when you are measuring AC current.
12.直流电流
Represented by capital V with three hyphens and a straight line on top, the symbol stands for current. You should use it when you are measuring DC current.
13. On/Off Switch
这是打开和关闭屏幕。
14. Auto-V/LoZ
此功能仅在选定的多项式中可用。它可以防止虚假测量。
15. Common Jack
Use this jack for all tests but only with a black test lead.
16.当前的杰克
使用此插孔用夹具附件或红色测试引线测量电流。
17.亮度按钮
Use this button to adjust the brightness of the screen. It becomes very useful when you take your multimeter outdoors, and the normal screen becomes very dim.
18.红色杰克
Use this jack for all types of tests except current. Tests include resistance, voltage, temperature, impedance, capacitance, recurrence and others.
Final Words:
一旦您完全了解了万用表上可用的不同符号，就可以最准确地使用它。此外，使用定期使用，您将习惯所有符号和按钮，并且可以像专业人士一样使用该工具。这些符号可能从一个模型到另一种符号略有不同，但是大多数符号具有相同的标准符号。您还可以检查手册以了解任何新按钮或符号的功能。
One Response
I just want to say for some time now I have been trying to find something to show me what the symbols mean, and how to get a understanding of them. Now I know it takes reading and studying these things to get better. What I had found up until now, other sites made it difficult. You did not. Thanks for that. I still want to learn more to make sure I am not doubting myself or guessing. I work with appliances and use volt meter a lot. One of my other issues is reading wire diagrams. But I’m working on it. Thanks again for simple:)