Мультиметром называют прибор, при помощи которого the value of voltage, current strength, resistance is measured, the wires are "roamed". That is, this device is quite in demand. And, as practice shows, it enjoys sufficient popularity not only in industry, but also in everyday life.
But before proceeding to the necessary measurements,it should be noted that the multimeter is not quite a harmless device. With improper use, you can not only easily disable it, but also cause serious harm to your health. This is particularly true when you need to measure at high voltage or high current. You can not only burn the multimeter right away, but also get a serious electric shock.
That is why, before proceedinguse of the multimeter, it is necessary to be trained on power supplies with low indicators of current strength, for example, on batteries. Also, do not neglect the instructions to the device.
To begin with, you should know that multimeters aredigital and analog (switch, among the electricians they are known as "shop"). The latter are known to electricians for a long time, but it is rather difficult to use them without special knowledge and practice.
That is why, if there is such an opportunity,it is better to use a digital multimeter. We will also consider examples using a digital device, since it is quite difficult to learn how to work with analog multimeters.
Varieties of digital multimeters are sufficientmany, but the principle of their work is similar to each other - the difference consists only in the number of functions of the device. Accordingly, the functionality of the multimeter depends on the price, so before you buy it, decide what you need it for.
The multimeter consists of:
So, what are the features of using this measuring instrument and how to test amperes with a multimeter?
In order to measure the current in the circuit,it is necessary to connect the device to it in series. At the same time on the multimeter, you need to insert a red probe into the socket on the device with the inscription mA, and black - in com. Serial connection means that the circuit must be disconnected and each probe connects to a different wire, i.e., the device must be connected between two power supplies. But since you measure the current, and in power supplies it is simply not possible, you need to include in the circuit of some device, for example a conventional light bulb, placing it in the circuit immediately after the power source.
If you measure the AC power, thenthe maximum AC value is set (A ~ icon - note that it is very similar to the DC icon (A-), so be careful). And only after that you can start measuring.
Before you test the amps with a multimeter,make sure that the strength of the measured current is not too high, since such measurements can be unsafe because of the small cross section of the probe wires. The latter can not withstand high loads. Specialists recommend measuring at a current of more than 10 A with electrical clamps.
The test must be carried out only under load. Check how many amperes in the battery are multimeter, only with using the internal capacity of the battery is not possible because of its small value - the obtained indicators do not display the true figures.
Measuring the tester can not only work current, butand the leakage current of the battery. Before you check with a multimeter, how many amperes make up the leakage current, you need to remember that it can go up to several amperes. Therefore, it is necessary to set the measurement limits on the device correctly, preferably to 10 A.
In practice, before you check the amps onbattery with a multimeter, the positive wire should be flipped from the battery terminal and the measuring device included in the resulting rupture. Then you need:
With some practice, you will not only know how to test amps with a multimeter, but you can easily find out the causes of the leak without contacting the service center.
Прежде чем ответить на вопрос:"How to check ammeters with a multimeter on the charger?", You need to know that you can measure, in principle, any charging. It can be from phones, tablets, memory for a car battery, etc.
Such measurements are most often needed whenIt is necessary to identify the cause of the fault memory. It should be noted that the current strength on the chargers of phones, tablets, etc. differs slightly and is usually indicated on the charge sticker or label. But if for some reason there is no such inscription, then you can check this figure with a multimeter.
Принцип измерения силы тока в зарядном устройстве can differ only in that because of the small size of the contacts on the connector, connecting them to the multimeter probes is quite difficult. To do this, it is necessary to insert neatly ordinary steel sewing needles into the contacts and connect the probes of the multimeter to them. If this can not be done, the only way out is to open the charger body in order to connect the probes directly to the terminals of the memory in the place where the ends of the electric cord are soldered.
Before talking about how to test amps with a multimeter for memory for a car battery, you need to know what it's for.
The optimal value of the charging current of such a chargeris 10% of the vehicle battery capacity. A large value will allow you to charge the battery faster, but it will negatively affect the battery itself and significantly reduce its usage time.
When purchasing such a memory in the store, allparameters are written on the charger itself. But such a charge, with minimal knowledge, you can do yourself. In this case, you will need a multimeter. Also, this measuring device is useful if the charger fails.
It should be said that when measuring currentAny charger in the circuit must include any load (for example, a conventional light bulb). Also, do not forget that often the memory gives a direct current, so the handle of the multimeter must be set to the correct position (A-).
How to check amps with a multimeter on a blockfood? This is also done on the gap with the mandatory application of the load. The principle itself is not much different from the verification of other sources. It should only be noted that the power supply units have a fairly large capacity, so measurements should be carried out quickly, without allowing the wires of the multimeter to be heated.
As we see, the multimeter can be very useful in everyday life and in demand in completely different areas, so getting the most minimal knowledge of its use is not superfluous.
