How to use a multimeter 5, how to use a multimeter

It depends on whether you use digital or analog, anyway, it is adjusted to the amount you want to measure, remember to connect the black watch pen to the negative pole of the power supply when measuring, and the red watch pen to the negative pole of the power supply.

It is also important to note that you pay attention to the readings... The reading method of the digital table and the analog table is different, if you buy the watch yourself, please read the manual in detail, and if you are a student, it is recommended that you ask the teacher.

There are n kinds of halo and multimeters, and the most common one is that there are two meter pens, which can measure resistance, voltage, current, etc.

1.The end knob (or jack) is selected correctly.

The red pen cable should be connected to the red end button (medium width or marked "+" jack), the black pen should be connected to the black end button (or connected to the "—" jack), some multimeters are equipped with AC and DC 2500 volt measurement end buttons, the black test rod is still connected to the black end button (or "—" jack), and the red test rod is connected to the 2500 volt end button (or in the jack).

2.The position of the transfer switch should be selected correctly.

Depending on the measurement object, the transfer switch is turned to the desired position. If the current of the excavation current is measured, the transfer switch should be turned to the corresponding current level, and the measured voltage should be transferred to the corresponding voltage level. Some multi-purpose surface plates have two transfer switches, one for the measurement type and the other for the measurement range.

When using it, you should first select the measurement type, and then select the measurement range.

3.The range should be selected appropriately.

Depending on the approximate range to be measured, the transfer switch is turned to the appropriate range of the type. When measuring voltage or current, it is best to have the pointer within one-half to two-thirds of the range for accurate readings.

4.Take the reading correctly.

There are a number of scales on the dial of a multimeter, which are suitable for different objects to be measured. Therefore, when judging the stool measurement, while reading on the corresponding scale scale, it should also pay attention to the cooperation between the scale reading and the range file to avoid errors.

5.Proper use of ohms.

Choose the appropriate magnification range: When measuring resistance, the magnification file should be selected so that the pointer stays in the thinner part of the scale mark, the closer the pointer is to the middle of the scale, the more accurate the reading, the more left, the more crowded the scale mark, the worse the accuracy of the reading.

Zeroing: Before measuring the resistance, the two test rods should be touched together, and the "zeroing knob" should be turned at the same time so that the pointer is just pointing at the zero position of the ohmic scale, this step is called ohmic zeroing. This step is repeated every time the ohm is changed before measuring the resistance to ensure the accuracy of the measurement.

If the pointer cannot be adjusted to the zero position, it means that the battery voltage is insufficient and needs to be replaced.

The multimeter is powered by a dry battery when measuring the resistance, and the measured resistance must not be charged to avoid damaging the meter head. When using ohmic gaps, do not short-circuit the two test rods to avoid wasting battery.

6.Pay attention to operational safety.

When using the multimeter, it is important to note that the metal part of the test rod should not be touched by hand to ensure safety and measurement accuracy.

When measuring higher voltages or larger currents, the transfer switch should not be turned live, otherwise the switch may burn out.

After the multimeter is used up, it is best to turn the transfer switch to the AC voltage maximum range, which is the safest for the multimeter, in case the multimeter is inadvertently damaged during the next measurement.

When the test rod touches the tested line, a comprehensive inspection should be done again to see if the position of each part is wrong.

Novice electricians use the universal meter method:

1. Measure the current.

Select the range according to the current in the circuit, test from large to small, insert the black watch pen into the "com" jack, insert the red watch pen into the appropriate gear jack, and finally connect to the circuit for measurement.

However, it is important to note that when measuring current, the multimeter and the circuit under test should be connected in series.

2. Measure the voltage.

First of all, you should judge whether it is DC voltage or AC voltage, insert the black watch pen into the "com" jack, and the red watch pen into the "V" jack, select the corresponding gear and range, and then connect the watch pen to the power supply or both ends of the battery to measure the voltage value.

To measure voltage with a multimeter, the multimeter should be connected in parallel with the line and equipment being measured. The red pen is connected to the positive pole, and the black pen is connected to the negative pole, if it is reversed, the voltage value will be displayed as a negative value.

3. Measure the resistance.

Select the resistance gear and appropriate range, connect the red pen to the "V" jack, and the black pen to the "COM" jack, and use the pen to connect the metal parts at both ends of the resistance to complete the measurement.

4. Measure the capacitance value.

Turn the selector switch to "Capacitor Profile", insert the two pins of the discharged capacitor directly into the "C-X" jack of the meter board, select the appropriate range, and read the display data.

5. Measuring diodes.

The method of measuring the diode is the same as measuring the voltage, dial the dial of the multimeter to the diode gear, connect the red watch pen to the "V" jack, and connect the black watch pen to the "COM" jack, and select the measurement file.

When the red watch pen is connected to the positive electrode and the black watch pen is connected to the negative electrode, the multimeter reading is generally about the same; The reading is 0L when reversed, and the positive and negative poles of the diode can be judged from this.

If the multimeter reads "or 0l" in both the forward and reverse directions of the diode, the diode is damaged.

Pay attention to the use of multimeters.

1) Before using the multimeter, "mechanical zeroing" should be carried out, that is, when there is no measured power, the multimeter pointer should be pointed at the position of zero voltage or zero current.

2) In the process of using the multimeter, do not touch the metal part of the meter pen with your hands, so that on the one hand, you can ensure the accuracy of the measurement, and on the other hand, you can also ensure personal safety.

3) When measuring a certain electrical quantity, it is not possible to shift gears at the same time as the measurement, especially when measuring high voltage or large electric sales and current, more attention should be paid to it. Otherwise, the multimeter will be destroyed. If you need to change gears, you should disconnect the watch pen first, and then go to measure after changing gears.

4) When the multimeter is in use, it must be placed horizontally to avoid errors. At the same time, care should be taken to avoid the influence of external magnetic fields on the multimeter.

5) After the multimeter is used, the transfer switch should be placed in the maximum gear of AC voltage. If it is not used for a long time, the battery bucket inside the multimeter should also be removed to prevent the battery from corroding other devices in the meter.

Dear, hello, I am glad to answer for you how to use a multimeter Answer: A multimeter is a multi-functional, multi-range portable electrical and electronic instrument. A general multimeter can measure DC current, DC voltage, AC voltage, and resistance, among others.

Some multimeters can also measure capacitance, inductance, power, transistor common emitter DC amplification factor HFE, etc. Therefore, the multimeter is one of the necessary instruments for our electrical and electronic majors. Multimeters can generally be divided into two types: analog multimeters and digital multimeters.

Pointer multimeter: The structure of the pointer multimeter: There are many types of pointer multimeter, but the basic structure is similar.

The structure of the pointer multimeter is mainly composed of three parts: the meter head, the transfer switch (also known as the selection switch), and the measurement line. Meter header: is a display device for measurement; The head of a multimeter is actually a sensitive galvanometer.

Transfer switch: Select the type and range (or magnification) of the amount to be measured. Measurement line:

Converts measured quantities of different properties and sizes into DC currents that can be accepted by the meter head. Header: Transfer Switch:

Digital Multimeter: Gear Dial: Socket:

Use of the multimeter - zero the correct wiring: the red pen is connected to the " " polarity jack, and the black watch pen is connected to the "—" or " or "com" polarity jack. When measuring straight flow, pay attention to the positive and negative polarity to avoid the pointer reversal.

When measuring the current of HVAC South Society, the instrument should be connected in series in the circuit under test; When measuring voltage, the instrument should be connected in parallel at both ends of the circuit under test. When measuring transistors, keep in mind that the red pen of the multimeter is connected to the negative pole of the battery in the meter; The black pen is connected to the positive pole of the battery in the watch. Correct selection of measuring gear:

When measuring voltage, the transfer switch should be placed in the corresponding voltage block; When measuring the current, the corresponding current block should be put in. When selecting a current or voltage range, it is best to keep the pointer at more than two-thirds of the scale position; When selecting a resistor range, it is best to place the pointer in the middle of the scale. When measuring, if you are not sure about the range of the measured value, you should first turn the transfer switch to the corresponding maximum range, and then gradually reduce it to the appropriate range according to the degree of deflection of the pointer.

Common measurement methods - AC and DC voltage measurement, current measurement: