What is the principle of AC measurement in a multimeter?

Because the meter head is a DC meter, a diode turns AC into DC and measures through the meter head.

The other diode is to form a loop of AC negative half-wave through r, without thinking about the measurement accuracy of the meter head.

Hello, dear, it is an honor to answer this question for you. How does a multimeter measure alternating current? Measure AC voltage with a multimeter: 1:

First, check whether the multimeter is in OFF mode; 2: Turn the multimeter to the buzzer gear and short the two watch pens; 3: Verify that the buzzer file emits a normal squeak, and the value displayed on the dial is equal to 0 or approximately 0, which means that the multimeter is normal; 4：

Adjust the multimeter to the voltage level to be measured, which is generally higher than the measured voltage, such as if we want to measure the 220V voltage to adjust to the AC voltage level 500V; 5: When measuring voltage, make sure to hold the meter pen in one hand to prevent electric shock. Note that the hand should not touch the metal part of the watch pen, and insert the watch pen into the socket to be tested; 6：

At this point, the value is read, i.e. the measured voltage. Finally, put away the watch pen and classify the gear as off. Hello, dear, thank you for your patience, I have helped you find some similar related questions Answers, please be patient to check ha

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Measure AC voltage with a multimeter Step 1: Select a gear.

The mains voltage is usually around 220V, and according to the principle that the gear should be higher than and closest to the voltage to be measured, the 750V gear is the most appropriate. Step 2: The red and black table pens are connected to the measured voltage.

Since there is no positive or negative difference between AC voltage, the red and black watch pens can be inserted into the two jacks of the mains socket at will. Step 3: Take a reading on the display.

Now observe that the value displayed on the display screen is 231, and the voltage value of the mains is 231V. Multimeter, also known as multiplex meter, multi-meter, three-purpose meter, multi-meter, multi-meter, etc., is an indispensable measuring instrument for power electronics and other departments, the main purpose is to measure voltage, current and resistance. According to the display mode, it is divided into pointer multimeter and digital multimeter.

It is a multi-functional, multi-range measuring instrument, which can generally measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, and some can also measure AC current, capacitance, inductance and some parameters of semiconductors (such as). Hope mine can help you <>

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How to use an old-fashioned multimeter to measure AC current Hello pro is happy to answer for you, your question we have inquired for you 1, the ammeter to measure the current in series in the circuit (the ammeter resistance is very small, parallel connection is almost a short circuit), to connect the multimeter in series in a line (live wire, neutral line can be, live wire is better), and then measure it. 2. When measuring DC current, place one transfer switch of the multimeter in the DC current block, and the other transfer switch in 50ua. To the appropriate range of 500mA, the range selection and reading method of Li Changliu in electricity is the same as that of voltage.

When measuring, the circuit must be disconnected first, and then the multimeter must be connected in series to the circuit under test in the direction of the current from "+" to "-", that is, the current flows in from the red pen and flows out from the black pen. If the multimeter is mistakenly connected in parallel with the load, the internal resistance of the meter head is very small, which will cause a short circuit and burn the meter. Here's how it is read:

Actual Value Indicates Range Full Bias. 3. The method of measuring AC voltage is similar to that of measuring DC voltage, but the difference is that there is no positive and negative difference between AC and AC, so when measuring AC, the meter rod does not need to be positive and negative. Readings should be taken by the position of the pointer on the tick marked with the AC symbol "AC".

In the process of circuit detection, we often use a multimeter, the multimeter can directly help us detect the circuit fault point, convenient for direct maintenance, and the scope of multimeter is very wide, is a necessary testing equipment in our life, so that the maintenance of the circuit becomes easier, so how to use the multimeter to measure the current? Let's take a look.

First of all, adjust the multimeter to the appropriate current level, if you don't know, you can measure it from large to small to find the appropriate range. After finding the range range, first adjust the pointer of the multimeter to the state of 0, and then insert the black pen into the COM mouth, and the red pen into the required gear, so that the current can be tested.

Precautions for the use of multimeters.

1. When using the multimeter, it is best to develop a way to check the position of the gear adjustment before measuring, and use the correct gear measurement to avoid the phenomenon of the multimeter burning out.

2. When choosing a good range, it is best to choose the pointer around two-thirds of the full scale, so that the read data is more correct, if the voltage can not be determined or the current can be tested and adjusted from a large number of ranges.

3. During the test, the pointer must be reset to zero before the measurement can be carried out after changing the range gear. If the battery voltage is insufficient, it will not return to the zero position, and the battery needs to be replaced.

4. In the process of use, do not directly touch the metal part of the watch pen with your hands to avoid electric shock accidents, and it will also affect the accuracy of the measured data.

Multimeter buying tips.

1. There are many brands of multimeters on the market now, such as Hexagon, Marr and Mitutoyo, etc., and it is more assured to choose a multimeter with good reputation and quality in terms of quality.

2. In terms of production, there must be differences between different manufacturers, and you can choose the right one according to your own needs.

3. In terms of after-sales, you must find a regular channel to buy, so that if there is a quality problem, the after-sales aspect is also more guaranteed.

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