What is the use of the ammeter

Rules for the use of ammeters: The ammeter should be connected in series in the circuit (otherwise it will be short-circuited. );

The current to be from"+"The binding post enters, from"-"The binding post is out (otherwise the pointer is reversed.) );

The measured current should not exceed the range of the ammeter (you can use the method of test touch to see if the range is exceeded.) );

It is absolutely forbidden to connect the ammeter to the two poles of the power supply without passing through the electrical appliance (the internal resistance of the ammeter is very small, equivalent to a wire. If the ammeter is connected to the two poles of the power supply, the pointer will be crooked, and the ammeter, power supply, and wire will be burned at worst. ).

Ammeter reading: 1See the range.

2.Look at the graduation value (in general, the scale 0 3a is the graduation value, and 0 is 3.)Look at the position where the watch hand stays (be sure to look at it from the front).

Preparation before use:1Adjust the zero button with a flat mouth cone change.

2.Select the measuring range.

How to use the ammeter correctly.

Summary. We're happy to answer for you! How to use the ammeter:

1. Adjust the zero button with a flat mouth cone change.

2. Select the range (estimated by experience or by trial touch method).

3.Reading.

Let's take a look at how to use these steps.

How to use the terminal post of the ammeter (range selection).

1.Standard - the connection of the negative pole.

2.Select the binding post according to the size of the access current

1) If the current is lower, you can use the standard binding post (do not use the 3A binding post for the most accurate as much as possible) 2) If the current is greater than less than 3A, use the standard 3 binding post.

3) If the current is greater than 3A, use a multimeter.

How to use the ammeter.

We're happy to answer for you! The method of using the ammeter: 1. Adjust the zero button with the flat mouth cone to adjust the zero button.

2. Select the range (estimated by experience or use the test touch method) 3After reading, let's take a look at the use of these steps. How to use the ammeter binding post (range selection) 1

Standard - 2Select the binding post according to the size of the access current: (1) If the current is lower, you can use the standard binding post (for the most accurate person as much as possible, do not use the 3A connection to the burning post) (2) If the current is greater than less than 3A, use the binding post of standard 3 (3) If the current is greater than 3A, use a multimeter.

4) If you don't know the size of the measured current, you can use "test touch", that is, access to the negative electrode, and touch the terminal post at the slow shed of the positive pole to see whether the pointer deflection is within the maximum range at the moment of connection.

Ammeter. How to use:

1. Calibrate zero and change the cone with a flat mouth.

Adjust the zero button.

2. Select the range (estimated by experience or by trial touch method).

3.Reading.

Let's take a look at how to use these steps.

How to use the terminal post of the ammeter (range selection).

1.Standard - the connection of the negative pole.

2.Select the binding post according to the size of the access current

1) If the current is lower, the target binding post can be used (3A binding posts are not used for the most accurate as possible).

2) If the current is greater than less than 3A, use the binding post marked 3.

3) If the current is greater than 3A, use a multimeter.

4) If you don't know the size of the measured current, you can use "trial touch", that is, access the negative pole, and the positive pole quickly touch the terminal post to see whether the pointer deflection is within the maximum range at the moment of connection.

Now that we know how to use an ammeter, let's take a look at how to take a reading of an ammeter correctly.

1.Let's see which range you are connected to.

The method is to see whether the binding post of the access circuit is marked or 3. On the far right of the dial.

The end says "3A" on the top and " on the bottom

If it is connected, it means that it is connected to a small range, at this time, the range of the ammeter is 0-, and the value represented by each minimum scale corresponds to the number in the line below the dial when reading, and the ammeter pointer is close to which scale, and it is read out.

2.If you connect 3 to this binding post, the range is 0-3a, and when each minimum scale represents the numerical value, it corresponds to the number on the dial, or who the pointer is close to, and reads the corresponding value.

Precautions during the use of the ammeter:

The ammeter should be connected in series in the circuit; If there is a parallel branch, which parallel electrical appliance needs to be measured, it will be connected in series with which electrical appliance;

To make the current from the "+" binding post and out from the "-" binding post;

The measured current cannot exceed the range of the ammeter; The ammeter has two ranges of 3A, and the range should be selected according to the maximum current of the circuit under test.

It is absolutely forbidden to connect the ammeter to the poles of the power supply without passing through the electrical appliance.

Clamp meter measurement method.

Precautions for the use of clamp tables:

1.When measuring the current, only one wire or the current of the same phase is measured at a time.

If two wires are measured at a time, the result is the sum of the currents of the two wires. (Note: Electric currents are not only magnitude but also directional; If the current is in the opposite direction, then the total current is the subtraction of the two current values).

For example, when you measure the neutral and live wires of a light bulb at the same time, the magnetic field generated is completely canceled out due to the equal magnitude and opposite direction of the neutral live current. So the result should be zero.

Clamp meter to measure zero live line.

If the measured result is not zero, then it means that the current of the zero line of the lamp and the live wire are not equal, and it means that the zero line of the lamp or the live wire has a current flowing to other places. For example: leakage.

The zero sequence transformer in the leakage protection device is based on this principle to judge whether the equipment leaks.

Leakage switch. 2.During the use of the clamp meter, the jaws must be kept clean and tightly closed.

As can be seen from the schematic diagram above, the clamp meter is composed of an open current transformer and an ammeter, when the jaws are not clean or other reasons cause the jaws to be closed tightly, so there will be a lot of magnetic flux leakage, resulting in a large measurement error.

3.The clamp meter can measure the current without the power supply turned on, but the gear shift must take the wire out of the jaws.

We all know that a clamp meter consists of an open current transformer and an ammeter. The secondary circuit is not allowed to open during the operation of the current transformer, otherwise a high voltage will be generated. Therefore, when changing gears in the case of live electricity, the voltage inside the clamp meter will even be several thousand volts, which seriously threatens the instrument and personal safety.

4.When measuring small currents, in order to reduce the measurement error and improve the accuracy, the measured wire can be wound several times. The measured value is then divided by the number of revolutions to get the actual current value.

How to use the ammeter correctly.

Is it correct to connect the current directly to the circuit without connecting electrical appliances or resistors?

How to use the ammeter correctly.

Under normal circumstances, the ammeter is not directly connected to the measurement line in series, because the components of the ammeter are relatively thin, and its direct current generally does not exceed 5A, so a CT current transformer will be installed, and the wire of the main circuit will pass through the CT current transformer to generate secondary current, and then the secondary current will be connected to the ammeter for measurement.

Ammeter in series The voltmeter is connected in parallel.

The use of the ammeter is as follows:Tools: clamp ammeter, plug-in board with wires, LED lights.

1. Turn on the knob of the clamp ammeter in a clockwise direction.

2. After the clamp ammeter is turned on, rotate the knob to the maximum current range.

3. Open the caliper, cover the wire of the plug board, and the wire should be in the middle of the jaw as much as possible. The measured value is shown as zero, which means that the range of hail ears is too large and needs to be lowered.

4. Adjust the current of the source clamp ammeter to 40 amps, and measure the value ampere.

5. Adjust the current of the clamp ammeter to the lowest level, the DC AC transfer switch is set to DC, the caliper covers the wire of the LED lamp, the measured DC value is ampere, and the ammeter measurement is over.

1. The ammeter should be connected in series in the circuit, and which part of the circuit is connected in series, and the measurement is the current of that part of the circuit. If it is connected in parallel in a circuit, the part of the circuit that is connected in parallel with it will be shorted. Because an ammeter is equivalent to a wire.

2. When the wire is connected to the terminal post of the ammeter, the current should flow from the "+" terminal post of the ammeter and out from the "-" binding post of the ammeter. Otherwise, the pointer of the ammeter will be deflected in the opposite direction (to the left), which may bend the pointer and damage the ammeter.

3. The measured current in the circuit should not exceed the range of the ammeter. If the range is exceeded, the pointer of the ammeter will be bent or even burned.

Before the ammeter is connected to the circuit, the current in the circuit is estimated and then the appropriate range is selected. If it is not possible, a test touch method should be used.

When trying to touch, first choose a large range, and use the connector of the wire to touch the binding post of the ammeter, if the deflection angle of the pointer is small, then choose a small range, otherwise use a large number of holes to bend the shed.

In the experiment, if the power supply is 2 batteries, the range of the ammeter can be 0. 4. When the ammeter is connected to the circuit, it is absolutely not allowed to connect the ammeter to the two poles of the power supply without passing through the electrical appliances. This is because the internal resistance of the ammeter is very small, equivalent to a wire If the ammeter is directly connected to the two poles of the power supply, the electric car flow meter will be damaged, and the ammeter will be burned out, and the power supply will also be damaged.

1. Connect the meter 2, select the range of the meter 3, and try to connect the circuit ammeter What should be paid attention to 1Connection. When measuring current, the ammeter should be connected in series with the circuit under test:

When measuring voltage, the voltmeter should be connected in parallel with the circuit under test. When measuring DC current and voltage, it is necessary to pay attention to the polarity of the instrument, which should be consistent with the polarity of the measurement. 2.

For the measurement of voltage and high current, when measuring high voltage or high current, a voltage transformer or current transformer must be used. The range of the voltmeter and ammeter should be consistent with the rated value of the transformer. The general voltage is 100V, and the current is the expansion of the range.

When the measured circuit exceeds the range of the instrument, an external shunt or voltage divider can be used, but it should be noted that its accuracy level should be consistent with the accuracy level of the instrument. 4.In addition, it should also be noted that the use environment of the instrument should meet the requirements and be far away from the external magnetic field.