The multimeter is a versatile electronic measuring instrument that measures some parameters such as DC current, voltage, and AC voltage. Divided into digital multimeters, pointers, etc., currently widely used is a digital multimeter, covering the functions of ammeter, voltmeter, ohmmeter, etc. Next, let's take a look at the use of the universal meter and the use of the multimeter!
First, the use of universal table
1. How to use the universal meter - check whether the positive and negative poles are correct before use. <br> Before using the universal meter, check whether the connecting wires of the red and black test rods are connected to the corresponding color binding posts. The red test is the positive side of the tested part, while the black test tests the negative part of the tested part. When encountering the positive and negative poles of the tested part, it is recommended to set the transfer switch to the gear with the largest DC voltage, then place the test bar on any one of the tested parts, and then use the other test bar at the other end. Gently touch it to observe the deflection of the pointer. If the pointer is deflected in the positive direction, the red bar is connected to the positive pole and the other is the negative pole. If the pointer is deflected in the opposite direction, the red test bar is in contact with the negative electrode and the other is positive.
2. How to use the universal meter - change from large to small magnification when using it <br> Some universal meters are also equipped with a special high-voltage insulated test pen when measuring high voltage. When measuring, be sure to ground the negative pen first. The test leads to a high potential. Also note that the resistance and current files cannot be used to determine the voltage. When changing the range, you must change the magnification from large to small. This will not damage the meter.
3, the use of the universal meter - switch the switch to the high-end position after use <br> After each use of the universal meter, it is recommended to switch the transfer switch to the high-pressure gear, so that the next operation is convenient, the resistance is measured with ohms When you choose the appropriate magnification, let the pointer indicate that the scale is thinner, so the measured data is more accurate.
4, the precautions for the use of the multimeter:
1. Before using the multimeter, first adjust the pointer of the multimeter to the position of zero voltage and current.
2. When measuring the multimeter, never touch the metal part of the test lead by hand, which not only makes the measurement data more accurate, but also protects the personal safety.
3. When measuring the high voltage and current of the same amount of electricity, it is not possible to shift gears at the same time when measuring. When shifting gears, it is recommended to disconnect the test leads first and then measure them after shifting, so that the universal watch will not be destroyed.
4. After the multimeter is used, set the transfer switch to the maximum limit of the AC voltage. If it is not used for a long time, you can take out the battery inside the universal watch to prevent the battery from being corroded.
Second, the use of the multimeter small mouth
1, the first look at the measurement, do not look at the measurement
Each time you pick up the test leads to prepare for measurement, be sure to check the measurement category and the range selector switch to the right position. In order to be safe, this habit must be developed.
2, the measurement does not shift, the measurement of the neutral
The selection knob cannot be arbitrarily adjusted during the measurement, especially when measuring high voltage (such as 220V) or high current (such as 0.5A) to avoid arcing and burning the changeover switch contacts. After the measurement is completed, the range selector switch should be set to the “?†position.
3, the dial should be level, the reading should be correct
Use the multimeter to rotate horizontally, and the line of sight should be facing the hand when reading.
4, the range should be appropriate, the needle is over half
If you can't estimate the measured size beforehand, you should try to select a larger range, and then gradually change to a smaller range according to the deflection angle, until the pointer is deflected to about 2/3 of the full scale.
5, measuring R is not charged, measuring C first discharge
It is strictly forbidden to measure the resistance when the circuit under test is dotted. When inspecting a large-capacity capacitor on an electrical device, the capacitor should be short-circuited and then measured.
6, the measurement of R first zero, shifting needs to be zero
When measuring the resistance, first turn the transfer switch to the electrical block, short the two test leads, and turn the “Ω†to zero potentiometer, so that the pointer points to zero and then measure. The ohmic zero point should be readjusted each time the electrical block is replaced.
7, black negative to remember, the table is black "+"
The red test pen is the positive pole and the black test pen is the negative pole, but the black gauge pen is connected to the positive pole of the internal battery.
8, the measurement I should be connected in series, the measurement U should be connected in parallel
When measuring current, the multimeter should be connected in series with the circuit under test; when measuring voltage, the multimeter should be connected in parallel at both ends of the circuit under test.
9, the polarity is not reversed, one-handed into a habit
When measuring current and voltage, pay special attention to the polarity of the red and black test leads. It is necessary to develop the habit of one-hand operation to ensure safety.
First, the use of universal table
1. How to use the universal meter - check whether the positive and negative poles are correct before use. <br> Before using the universal meter, check whether the connecting wires of the red and black test rods are connected to the corresponding color binding posts. The red test is the positive side of the tested part, while the black test tests the negative part of the tested part. When encountering the positive and negative poles of the tested part, it is recommended to set the transfer switch to the gear with the largest DC voltage, then place the test bar on any one of the tested parts, and then use the other test bar at the other end. Gently touch it to observe the deflection of the pointer. If the pointer is deflected in the positive direction, the red bar is connected to the positive pole and the other is the negative pole. If the pointer is deflected in the opposite direction, the red test bar is in contact with the negative electrode and the other is positive.
2. How to use the universal meter - change from large to small magnification when using it <br> Some universal meters are also equipped with a special high-voltage insulated test pen when measuring high voltage. When measuring, be sure to ground the negative pen first. The test leads to a high potential. Also note that the resistance and current files cannot be used to determine the voltage. When changing the range, you must change the magnification from large to small. This will not damage the meter.
3, the use of the universal meter - switch the switch to the high-end position after use <br> After each use of the universal meter, it is recommended to switch the transfer switch to the high-pressure gear, so that the next operation is convenient, the resistance is measured with ohms When you choose the appropriate magnification, let the pointer indicate that the scale is thinner, so the measured data is more accurate.
4, the precautions for the use of the multimeter:
1. Before using the multimeter, first adjust the pointer of the multimeter to the position of zero voltage and current.
2. When measuring the multimeter, never touch the metal part of the test lead by hand, which not only makes the measurement data more accurate, but also protects the personal safety.
3. When measuring the high voltage and current of the same amount of electricity, it is not possible to shift gears at the same time when measuring. When shifting gears, it is recommended to disconnect the test leads first and then measure them after shifting, so that the universal watch will not be destroyed.
4. After the multimeter is used, set the transfer switch to the maximum limit of the AC voltage. If it is not used for a long time, you can take out the battery inside the universal watch to prevent the battery from being corroded.
Second, the use of the multimeter small mouth
1, the first look at the measurement, do not look at the measurement
Each time you pick up the test leads to prepare for measurement, be sure to check the measurement category and the range selector switch to the right position. In order to be safe, this habit must be developed.
2, the measurement does not shift, the measurement of the neutral
The selection knob cannot be arbitrarily adjusted during the measurement, especially when measuring high voltage (such as 220V) or high current (such as 0.5A) to avoid arcing and burning the changeover switch contacts. After the measurement is completed, the range selector switch should be set to the “?†position.
3, the dial should be level, the reading should be correct
Use the multimeter to rotate horizontally, and the line of sight should be facing the hand when reading.
4, the range should be appropriate, the needle is over half
If you can't estimate the measured size beforehand, you should try to select a larger range, and then gradually change to a smaller range according to the deflection angle, until the pointer is deflected to about 2/3 of the full scale.
5, measuring R is not charged, measuring C first discharge
It is strictly forbidden to measure the resistance when the circuit under test is dotted. When inspecting a large-capacity capacitor on an electrical device, the capacitor should be short-circuited and then measured.
6, the measurement of R first zero, shifting needs to be zero
When measuring the resistance, first turn the transfer switch to the electrical block, short the two test leads, and turn the “Ω†to zero potentiometer, so that the pointer points to zero and then measure. The ohmic zero point should be readjusted each time the electrical block is replaced.
7, black negative to remember, the table is black "+"
The red test pen is the positive pole and the black test pen is the negative pole, but the black gauge pen is connected to the positive pole of the internal battery.
8, the measurement I should be connected in series, the measurement U should be connected in parallel
When measuring current, the multimeter should be connected in series with the circuit under test; when measuring voltage, the multimeter should be connected in parallel at both ends of the circuit under test.
9, the polarity is not reversed, one-handed into a habit
When measuring current and voltage, pay special attention to the polarity of the red and black test leads. It is necessary to develop the habit of one-hand operation to ensure safety.
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