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Anonymous users2024-02-06Multimeter, 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, generally for the main purpose of measuring voltage, current and resistance. Multimeters are divided into pointer multimeters and digital multimeters according to the way they are displayed. It is a multi-functional, multi-range measuring instrument, generally multimeter can 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).
The model of the multimeter is not the same as the country of production, the keys are similar, there are many functions, what do you need to know, I do my best.
Hope ( Source: Encyclopedia.
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Anonymous users2024-02-05The correct use of the multimeter can not only quickly determine the fault location, but also prevent damage to the electrical equipment and the multimeter itself. Let me tell you some tips for using a multimeter.
Measure first look at the block, don't look and don't measure.
The measurement is not dialed, and the neutral gear is measured after the measurement.
The dial should be level and the readings should be aligned.
The range should be appropriate and the readings should be aligned.
The test r is not charged, and the test c is discharged first.
The r test is adjusted to zero first, and the gear shift needs to be adjusted to zero.
The black negative should be remembered, and the black connection in the table is +
The test I should be connected in series, and the test u should be connected in parallel.
The polarity is not reversed, and one-handed becomes a habit.
Multimeters can generally be divided into two types: analog multimeters and digital multimeters.
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Anonymous users2024-02-041. First of all, let's take a look at the function of the multimeter; Purpose of multimeter: Multimeter can measure a variety of different physical quantities such as: voltage, current, resistance.
2. A multimeter is equivalent to the following measuring instruments at the same time: voltmeter, ampere meter, ohmmeter;
3. Measure the voltage (potential difference), the voltage is measured on a universal pin and an electrical prong.
4. Measuring resistance, the ohmmeter can make three different measurements: the measurement of resistance (r=specific value), the determination of line connection (r=0), and the determination of insulation (r=infinity).
5. The ohmmeter is always connected in series with an electrical appliance or an electrical conductor; The connection circuit should always be in the open circuit of the power supply; The ohmmeter should never be connected to the current generator (power supply).
6. The measurement of current, the ammeter is to measure the current intensity of the circuit (pay attention to the position of the plug-in line), and the connection of the ampere meter is always in series.
7. Conclusion: In short, before connecting the multimeter, put the circuit outside of the voltage (open circuit) and ask yourself the following questions:
1) What measurements are you going to make? Voltage, resistance, current.
2) Is the power supply of the line DC or AC?
3) What is the value of the measured physical quantity? 12V or 220V, 5A or 5mA, 10?Or 10k?. If you don't know, take the maximum value first and then adjust it.
4) How do I connect a multimeter? Voltmeters are connected in parallel, ohmmeters are open-circuit, and ammeters are connected in series.
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Anonymous users2024-02-03How to use the multimeter:1. According to the measured item, adjust the multimeter to the appropriate gear, such as gear, A gear, V gear;
2. Roughly estimate the value of the measured item and adjust the range of the multimeter;
3. Connect the multimeter to both ends of the measured item, and the red pen and black pen are connected accurately, and the corresponding value will be displayed on the multimeter.
4. When measuring the resistance, after selecting the appropriate magnification gear, the two table pens touch to make the pointer point at the zero position, if the pointer deviates from the zero position, the "zero" knob should be adjusted to make the pointer return to zero to ensure the accuracy of the measurement results. If it cannot be zeroed or the digital display meter sends out a low voltage alarm, it should be checked in time.
Precautions for the use of the universal meter:1. When measuring current and voltage, it is not possible to change the range with electricity.
2. When selecting the range, you should choose the large one first, and then the small one, so that the measured value is close to the range.
3. When measuring resistance, it cannot be measured live. Because the universal meter is powered by an internal battery when measuring resistance, if it is measured live, it is equivalent to an additional power supply, which may damage the meter head.
4. After use, the transfer switch should be in the maximum gear or neutral gear of AC voltage.
The bad part is the transformer, the transformer in the circuit can be used for the audio output transformer for transistor radio, the secondary is used as the primary of the step-up transformer, the tap in the middle of the primary is not used, and the taps at both ends are used as the secondary of the step-up transformer. If you can't find a suitable transformer, you can also use the silicon steel sheet of the radio output transformer to make your own, and use a high-strength enameled wire with a diameter of 0 25mm for 110 turns for the primary stage, and a high-strength enameled wire with a diameter of 0 21mm for 520 turns for the secondary. A layer of insulating paper should be added between the primary stages, and attention should be paid to the eponymous end of the primary stage coil. >>>More
Turn the digital multimeter to the current gear, take the red and black stylus to the two sides of the contact switch under the float, there is a current display to prove that it is energized, and there is no current display to the line is faulty.
Looking for faults should be first outside and then inside, easy first and then difficult, and the whole should be broken into zero, and the key breakthroughs should be made. The methods can be roughly divided into the following types:1 >>>More
There are five ohmic gears in the universal meter, that is, x2 x10 x100 x1k x1k x10k, all of which measure resistance, collectively referred to as ohmic gears. As shown in the rectangle, the red arrow is marked with. >>>More
Hello, under the premise of no professional measurement period, if the owner has his own multimeter, he can only make a general health measurement of the vehicle battery, of course, this is not possible to do a very accurate measurement. Therefore, the multimeter measurement results can only be used as an approximate reference. >>>More