Choosing a multimeter: how to buy a good device, rating of devices for home and car repair

When carrying out electrical work, it is required to measure technical parameters. Craftsmen need to know the magnitude of the current, voltage level and resistance. To make an accurate measurement, you need a special tester. It is necessary for a home craftsman, car mechanic, professional. The choice of a multimeter is carried out taking into account the basic parameters. This device must meet the stated requirements.

Multimeter Specifications

A multimeter should be in the home of every person and craftsman. It simplifies the work, helps to find out the exact electrical parameters. Thanks to the use of this device, you can detect possible breakdowns and open circuits in the network. Masters can check the integrity of the heating element, electrical components, lamps.

There are several main criteria for choosing:

• type of;
• functioning;
• acceptable level of inaccuracy, error;
• design features;
• degree of safety and protection from contamination;
• manufacturer and availability of warranty service.

When choosing, you need to take into account the main characteristics. They will help to solve the main tasks that arise during work.

It is enough for electricians to use a simple tester that will measure voltage, check resistance. The presented device helps to ring the circuit to find an open.

If the multimeter is to be used by electricians, then it is necessary to select a device with the "current clamp" function. It is needed to measure the current load while the equipment is running. In this case, there is no need to interfere with the general scheme. Thanks to these possibilities, the occurrence of an accident is prevented.

The device must be equipped with the necessary functions and be convenient to use. For easy use, it is worth choosing compact models. These are pocket digital multimeters, the dimensions of which do not exceed the parameters of a matchbox. When you do not need to move often during work, you need to choose larger devices. They provide more accurate data and readings.

Varieties of devices

Regardless of the type of device, all multimeters have the same range of tasks. When choosing, you need to take into account the advantages and disadvantages of a particular model.

Measuring testers are of two types:

• digital (use of an electronic board);
• analog (they have a scale and an arrow).

Electronic multimeters help to solve various household tasks. They are easy to use and help you to take readings conveniently. All information is shown on the display. There are various models of digital multimeters on the market that have different prices.

Their cost depends on the functions and capabilities of the device. Analog multimeters are more difficult to use. The reading may vary depending on the specific angle. The pointer tester is convenient for professional electricians. They will be able to accurately track the dynamic readings of the electrical circuit.

There is no such function in a digital multimeter. But these models have other convenient features. Digital testers start at 250 rubles. To measure indicators on such a device, it is important to observe the polarity. If the display shows "-" next to the number, then the connection is made in the reverse order. On analogue models, the arrow deviates out of scale if polarity is not observed.

In electronic models, a battery is installed. Its charge is consumed during measurement procedures. They are accurate and correct when fully charged. In analog devices, true readings are stored during voltage and current measurements. The arrow may begin to deviate from zero at minimum charge.

Functions and important parameters

When choosing a multimeter, you can read reviews, recommendations and tips before buying. It is important to consider the functional features. Manufacturers who add new features increase the cost of the tester. Each tester is equipped with the main set of parameters for work:

• measurement of the magnitude and limit reading of the current;
• calculation of non-constant current;
• checking the alternating voltage in a closed circuit (the maximum value is 700 V);
• checking contacts (they should work without interruption);
• assessment of conductors.

Many manufacturers are trying to equip modern testers with new functions and capabilities. Wizards can additionally use the display backlight, which turns on when the device is first used. The device automatically determines the permissible measurement limits, records all readings.

An important and main characteristic is accurate measurements. It is necessary to choose devices that have an error in the range of 1-3%. If the work is carried out at home, then the indicator should not exceed 3%. Professional craftsmen need to choose the most accurate devices possible.

The price of a multimeter with a minimum error starts from $ 1,000. rubles. Simple models are presented in specialized stores for 300-400 rubles.

Another important indicator is the presence of the display capacity. It helps to display a certain number of decimal places or decimal places on the screen. The bit depth is chosen depending on the tasks and personal requirements.

Power and electrical safety

The testers are powered by 9 V krone batteries. Such models can be used irregularly. They are not suitable for heavy and constant loads. If the master needs to regularly take measurements, choose li-ion batteries.

When specialists work in one place, it is worth buying a device that works from the electrical network. For such models, be sure to buy a voltage converter from 220 V to 9 V. The efficiency of work and the features of operation are influenced by the class of electrical safety.

A CAT I multimeter is designed for use in networks where there is low voltage. CAT II testers are used in household networks. CAT III devices have increased safety, therefore they are used in the network of various structures and buildings. Next generation metering devices are needed for outdoor distribution work.

Operating rules

To measure the voltage level in a home network or outlet, be sure to set the switch to the ACV position. The black wire is connected to the COM connector, and the red wire is connected to V / mA.

If the maximum permissible value is unknown, then measurements should be started from the maximum possible value of 750 V. When the number "0" appears, the user needs to switch to using a different scale, because there is a lower voltage level. To make measurements with constant voltage in the wiring of a car or vehicle, you need to set the switch to DCV mode.

If used improperly, the device may break down and become malfunctioning. This problem often occurs for users who do not know the current value. In this case, you need to connect the wires to the red probe (10 A connector). A small value appears on the display.

Safe mode for instrument application - voltage measurement. To do this, set the rotary switch to position W, take measurements. Before that, you need to turn off the power in the circuit. With the help of a multimeter, ring the electrical circuit. The switch is turned to the desired position, the red probe is connected.

If the electrical circuit is closed, the device signals this with a sound signal. The area where the ringing is carried out must be disconnected from the power supply.

Rating of the best models

Manufacturers regularly improve devices, add new features and expand opportunities for professionals as well as DIYers. With the help of such devices, you can carry out diagnostics in a car. Below is a rating of multimeters for home and professional use.

DT-830 B device

This is an inexpensive model that has a set of necessary parameters. They are required for beginners and experienced electricians, home craftsmen. Power is supplied by a 9 V krone battery. This model has a liquid crystal indicator, a function switch, two probes (red and black).

Users can conduct the following measurements:

• calculation of direct current within acceptable limits;
• AC voltage measurement;
• resistance;
• checking the status and performance of diodes;
• determination of parameters and integrity of transistors.

If used improperly, the tester may malfunction. This model has proven itself well in home use. There are several modifications. They differ in appearance, functions and parameters.

Tester C266 (DT-266)

This model was assembled on the basis of the previous device. The peculiarity of the device is the presence of a clamp meter, a measurement fixation button. Craftsmen can check the electrical circuit and equipment. The device can record the result and save it.

This model is most in demand among professional electricians. It has large dimensions and parameters. In the presented model there is a liquid crystal indicator, a switch, sockets for connecting current clamps, probes. Power is supplied with a crown battery.

Model M812

This is the best digital multimeter that is small in size. Its weight is 90 grams. The tester fits easily into a small bag or pocket. It is very popular with electricians who repair cars and diagnose equipment.

Its design features practically do not differ from standard models. It has a familiar body, a three-charge indicator, and a mode switch. With this model, you can measure following parameters:

• constant and alternating voltage;
• D.C;
• integrity and operability of the circuit (presence of sound indication);
• verification of electronic semiconductor components;
• resistance in the tested area.

This multimeter detects a signal generator to test the functionality of the amplifiers. It is used to repair radio equipment. Thanks to the knowledge of the technical characteristics and parameters, you can understand which multimeter to buy for work.

A multimeter is a measuring instrument that is used for different purposes and tasks. It measures network and other parameters. During operation, it must be borne in mind that certain elements may be under active voltage. It is important to familiarize yourself with safety precautions before using. The device must be kept clean.

It is strictly forbidden to operate the tester with probes with damaged insulation areas. To choose the best multimeter, you need to consider the specifications and parameters.