How to use a digital multimeter M830V video

A multimeter is a combined type measuring device for measuring electrical resistance, voltage, and current. There are 2 types of these devices: digital and analog. The device is used by electricians and radio electronics engineers. Multimeter M830B is the most popular measuring device, easy to use and operate. The article provides a complete overview of its main characteristics, capabilities, and operating instructions.

Multimeter appearance and connectors

On the front of the tester, all the inscriptions are made in English, and even using abbreviations.
What do these inscriptions mean:

• OFF - the device is turned off (to prevent the device batteries from running out, set the switch to this position after measurements)
• ACV - measurement of variable U
• DCV - constant U measurement
• DCA - DC current measurement
• Ω - resistance measurement
• hFE - measurement of transistor characteristics
• diode icon - continuity test or diode test

Switching modes occurs using the central rotary switch. When you first start using your digital multimeter, it is recommended that you immediately mark the pointer mark on the switch with contrasting paint. For example like this:

Power is supplied from a Krona battery. By the way, by looking at the connector for connecting the crown, you can indirectly judge whether the tester was assembled in a factory or somewhere in Chinese “cooperatives”. With high-quality assembly, connection occurs through special connectors designed for the crown. Lesser quality options use regular springs.

The multimeter has several connectors for connecting probes and only two probes

Therefore, it is important to correctly connect the probes to measure certain quantities, otherwise you can easily burn the device

The probes are usually of different colors - red and black. The black probe is connected to the connector labeled COM (translated as “common”). Red probe into the other two connectors. The 10ADC connector is used when it is necessary to measure current from 200mA to 10A. The VΩmA connector is used for all other measurements - voltage, current up to 200mA, resistance, continuity.

The main criticism is caused by the factory probes that come with the device. Almost every second owner of a multimeter recommends replacing them with better ones. However, their cost can be comparable to the cost of the tester itself. As a last resort, they can be improved by strengthening the bends of the wires and insulating the tips of the probes.

If you want high-quality silicone probes with a bunch of tips, then you can order them with free shipping on AliExpress here.

Previously, pointer testers were also widely used. Some electricians even prefer them, considering them more reliable. However, due to the large error of the measurement scale, it is less convenient for ordinary consumers to use them. In addition, when working with a dial multimeter, it is imperative to guess the polarity of the contacts. For digital ones, if they are connected to the poles incorrectly, the readings will simply be displayed with a minus sign. This is normal operation and will not damage the multimeter.

Basic Multimeter Operations

Voltage measurement

How to use a digital multimeter to measure voltage? To do this, set the switch on the multimeter to the appropriate position. If this is the voltage in the outlet at home (alternating voltage), then flip the switch to the ACV position. Insert the probes into the COM and VΩmA connectors.

First of all, check that the connectors are connected correctly. If one of them is mistakenly installed in contact 10ADC, a short circuit will occur when measuring voltage.

Start measuring from the maximum value on the device - 750V. The polarity of the probes does not play any role at all. It is not necessary to touch the zero with a black probe, and the phase with a red one. If a much lower value is displayed on the screen, and the number “0” appears in front of it, this means that for a more accurate measurement, you can switch to another mode, with a smaller voltage level scale that your multimeter allows you to measure.

When measuring DC voltage (for example, electrical wiring in a car), switch to DCV mode.

And you also start measuring from the largest scale, gradually lowering the measurement levels. To measure voltage, you need to connect the probes in parallel to the circuit being measured, while using your fingers to hold only the insulated part of the probe so as not to get under voltage yourself. If the display shows a voltage value with a minus sign, this means that you have reversed the polarity.

ATTENTION: when measuring voltage, be sure to check that the multimeter scale is set correctly. If you start measuring voltage with the DCA switch in the on position, i.e., measuring current, you can easily create a short circuit right in your own hands!

Some experienced electricians recommend holding both probes in one hand when measuring the voltage in an outlet. If the probes are poorly insulated and breakdown, this will allow you to protect yourself to some extent from electric shock.

The multimeter operates on a battery (a 9-volt crown is used). If the battery starts to run low, the multimeter starts to lie shamelessly. In the outlet, instead of 220V, it may seem like 300 or 100 Volts. Therefore, if the device readings begin to surprise you, first check the power supply. An indirect sign of battery discharge can be chaotic changes in the readings on the display, even when the probes are not connected to the object being measured.

Current measurement

The device can only measure direct current. The switch must be in the – DCA position.

Be careful! When measuring current, if you do not know approximately what limits the current will be, it is better to start measuring by inserting the probe into the 10ADC connector, otherwise measuring a current of more than 200mA at the VΩmA connector can easily blow the internal fuse.

Here, probes, unlike voltage measurements, must be connected in series with the object being measured. That is, you will have to break the circuit and then connect the probes into the resulting gap. This can be done in any convenient place (at the beginning, middle, end of the chain).

In order not to constantly hold the probes with your hands, you can use alligator clips for connection.

Know that if, when measuring current, you mistakenly set the switch to ACV mode (voltage measurement), then most likely nothing bad will happen to the device. But if it’s the other way around, the multimeter will fail.

Resistance measurement

To measure resistance, set the switch to position - Ω.

Choose the desired resistance value or start again with the largest one. If you are measuring resistance on some operating device or wire, it is recommended to turn off the power from it (even from the battery). This way the measurement data will be more accurate. If during measurement the value “1, OL” appears on the display, this means that the device is signaling an overload and the switch needs to be set to a larger measurement range. If “0” is displayed, then on the contrary, reduce the measurement scale.

Most often, a multimeter in resistance mode is used during repair work, to check the functionality of household appliances, the serviceability of the windings, and the absence of a short circuit in the circuit.

When measuring resistance, do not touch the bare parts of the probes with your fingers - this will affect the accuracy of the measurements.

Calling

Another operating mode of the tester that is often used is dialing.

What is it for? For example, in order to find an open circuit, or vice versa - to make sure that the circuit is not damaged (checking the integrity of the fuse). The level of resistance is no longer important here; it is important to understand what is wrong with the circuit itself - whether it is intact or not.

It should be noted that there is no sound signal on the DT830B.

For other brands, as a rule, the signal is heard at a circuit resistance of no more than 80 Ohms. The dialing mode itself occurs when the pointer is positioned - checking the diodes.

It is also useful to check the integrity of the probes themselves by testing them by connecting them to each other. Since with frequent use they may be damaged, especially at the point where the wire enters the probe tube. Before each measurement, be sure to make sure that there is no voltage in the area where you will connect the test leads, otherwise you may burn the device or create a short circuit.

Current measurement

Using a multimeter to measure direct or alternating current, you need to insert the red probe into the mA socket, the black one into the com. If the current measurement is carried out with a variable source, then the switch is moved to the department - A~, with a constant one: A–.

The main condition for how to correctly measure current with a multimeter is to install the device in the circuit in series. Experts have a negative attitude towards using a multimeter as a tester to check large current consumption (for example, above 10 amperes). It is better to do this with electrical clamps. Therefore, it is better not to measure current with a multimeter.

The whole point is not in the tester itself, because it itself is protected by a metal bracket, through which large currents are checked. The bracket is installed internally and has a diameter of 1.5 mm. This size is capable of withstanding a significant amount of measured current in 10-12 seconds. It's all about the probe wires. They are thin and, of course, not designed for heavy loads.

Measurements of basic parameters

The operation of the DT-830B multimeter is best considered using the example of measuring parameters that are most often encountered in everyday life. You can start mastering the device by measuring the voltage in a 220V network.

First of all, the expected measurement limit is set. The value "200" is not suitable, so you will have to use "750". The probes are installed in the required connectors, after which all that remains is to touch the two contacts available in the socket. The result will be displayed on the screen.

If the DT830B multimeter measures DC voltage, a minus sign may appear on the display. It does not always appear, since it depends on the potential of the probe with the black wire included in the COM connector. A minus sign will be displayed when the black wire has a positive potential, indicating reverse polarity.

Quite often it is necessary to find out the identity of the wire, that is, determine the phase and zero. In this case, one probe touches any grounded surfaces - ground wire, batteries, pipes, etc. The other probe alternately comes into contact with the conductors of the cable whose phase needs to be determined. In case of contact with a phase wire, a result in the range from 220 to 240V will appear on the screen.

If there are no metal grounding surfaces, another method is used for testing. You need to take one probe in your hand and touch the cable cores with the other one in turn. In this case, the multimeter will produce values ​​of 60-240V, which also indicates the presence of a phase. The difference in readings depends on the shoes and the surface on which the examiner stands.

There is no need to be afraid of electric shock, since the DT device has a high intrinsic resistance. The most important thing is not to touch the open parts of the probe involved in the phase search. When performing such a check, you should be extremely careful and careful.

Everyone knows that electric current flows in a closed circuit. Therefore, in order to measure the current, one of the wires of this circuit must be open. After this, with the help of probes, a single circuit is formed. When attempting to measure voltage in current measurement mode, a short circuit will occur and the device will fail. The tester itself has zero internal resistance.

Before making measurements, the type of current must be correctly determined, which may be direct or alternating. If you make the wrong choice, nothing bad will happen, the device will just not show anything.

It is very important to remember that when installing probes into an electrical circuit, the voltage must be turned off. You should study the markings of the probes for the maximum current holding time. Typically, the measurement lasts no more than 10 seconds, after which the wire may begin to heat up and the insulation will melt.

Application of General Purpose Multimeter

A general purpose multimeter is a measuring instrument designed to measure currents, voltages and resistances in household networks, devices and cars.

A typical representative of such a multimeter is the MAS 830L device.

It is made according to the classical scheme. The device includes:

• LCD indicator14 for visualization of measurement results;
• digital scale backlight switch 2;
• self-diagnosis mode switch 1;
• mode switch;
• probe sockets 7, 8, 9;
• connector for connecting transistors 10.

The impact-resistant multimeter body is housed in a rubber casing to increase mechanical resistance.

Security measures

During the measurement process, the following safety precautions should be observed:

• when working with high voltages (at 200 and 600 volts), do not touch the current-carrying elements of probes, wires, and connectors;
• when taking measurements in a 220/380 Volt household network, it is necessary to use personal protective equipment (rubber gloves, insulating mat);
• when measuring high currents (10 A), it is advisable to use safety glasses to prevent sparks from entering the organs of vision;
• Current measurements should only be made during an open circuit.

Preparing the device for operation

Before starting work, insert the probes into the sockets. One probe is inserted into the common connector – it is marked “com”, and the second – depending on what you will measure: for voltages and resistances, choose the connector marked U and R, and for current – ​​marked A.

Next, turn on the device: to do this, simply move the switch to the desired position: for voltages this is section U, current – ​​A, and resistances – R. The screen should show zeros for the voltage and current measurement mode, and one for the resistance measurement mode. If you see a battery icon, replace the multimeter's power supply.

To check the integrity of the probes, some technicians first turn on the device in resistance measurement mode and short-circuit the probes; the screen should show zero resistance; if this is not the case, then they check the probes and their wires.

Measuring voltage

To measure the voltage in the circuit yourself, you must first move the switch to the desired position. In a network with alternating voltage (for example, in a socket), the switch arrow should be in the ACV position. The probes must be connected to the COM and “VΩmA” sockets. Next, select the approximate network voltage range. If difficulties arise at this stage, it is better to set the switch to the highest value - for example, 750 Volts. Next, if the display shows a lower voltage, you can move the switch to a lower level: 200 or 50 Volts. Thus, by reducing the setpoint to a more suitable one, you can determine the most accurate value. In a constant voltage network, you need to use a multimeter in the same way. Usually, in the latter case, it is best to set the switch to 20 Volts (for example, when repairing car electrical systems).

A very important nuance that you should know about is that you need to connect the tentacles to the chain in parallel, as shown in the picture:

This is the method you need to use a multimeter to determine DC and AC voltage in an electrical circuit. As you can see, there is nothing complicated, the main thing is not to touch the bare parts of the tentacles with your hands, otherwise you can avoid electric shock. By the way, you can also use an indicator screwdriver as a voltage indicator!

Types of multimeters

According to the type of indication of measured values, multimeters are classified into:

• switches;
• digital.

In dial multimeters, a magnetoelectric microammeter with a system of switching shunts and diode assemblies is used as a basic measuring device. The analog scale has divisions for measuring electrical quantities. Type of dial multimeter.

In digital multimeters, the analog measured signal is converted into a digital one, then the information is processed and transmitted to a digital scale. Digital multimeters have a number of advantages over dial ones:

• increased measurement accuracy;
• clarity of indication;
• mechanical resistance to falls;
• ease of use by non-professionals.

Manufacturers produce multimeters for general and special purposes.

Special digital multimeters can be designed for:

• measurements of large electrical quantities;
• control of climatic parameters (pressure, temperature);
• measurement of parameters of radio components (resistance, capacitance, inductance).

Purpose and features

The DT-832 multimeter is a digital device designed for measuring various electrical quantities. It is produced by Digital Multimeter. Country of assembly: China. The undeniable advantage of this device is its functionality and small size. Among the shortcomings of the device are the lack of an independent power button, a stand, and insufficiently high-quality probes included.

You can measure with a multimeter:

• constant and alternating voltage;
• resistance;
• pn junctions;
• D.C;
• wiring integrity;
• transistor gain.

In addition, the device has a built-in U-shaped generator with a signal amplitude of 5 V and a diode testing function. Device features:

• presence of overload protection for all measuring ranges;
• automatic determination of the polarity of a constant signal;
• automatic zero correction based on analog-to-digital double conversion.

Structurally, the device is a rectangular body with rounded corners made of durable plastic. Its length and width are 126 and 70 mm, respectively, and its thickness is only 28 mm. The weight when fully assembled does not exceed 150 grams. The device is available in black with white lettering indicating the possible position of the switch. The tester has a liquid crystal screen, three sockets for connecting test leads and a biscuit-type mode switch. At the back of the device there is a compartment with a closing lid to accommodate the battery. To operate the multimeter, a KRONA type battery with a voltage of nine volts is required.

In addition to the tester, the kit includes a power supply, two test leads and user instructions for the DT-832 digital multimeter. The device comes in two versions: boxed version or OEM. The second is thick cellophane, into which only the device itself is placed.

The meter is intended for use in any conditions: field, household, laboratory. When used as intended, it is not a source of danger, but only qualified personnel with measurement approvals and the necessary knowledge can work with it.

How to find out voltage and current. Sequencing

To determine voltage using a multimeter, proceed as follows:

1. Select the desired mode on the device.
2. Set the range of values. For a 220 V outlet this is 600 or 750 V. If you don’t know the exact data, set the maximum.
3. Connect the probes to the multimeter: black - to the COM connector, red - to VmA.
4. Attach the second ends of the rods to the object being measured. If you see a negative indicator on the screen, it means you have mixed up the probes.

When measuring current, you need to be especially careful. If performed incorrectly, the procedure is unsafe for humans and the device. The main feature is that the probes need to be connected not in parallel, but in series. The readings should be taken as soon as possible. The rest of the algorithm is approximately the same:

• current determination (AC or DC);
• selecting the appropriate mode on the device;
• setting a range of values ​​(exact or maximum);
• serial connection of probes;
• reading readings from the display.

You need to use the multimeter very carefully, because you are dealing with electricity

It is important to take into account all the nuances and remember that the basis for successful work is compliance with safety rules. All other skills will come with experience.

Scheme and repair

If you have the appropriate skills for repair work, you can use the diagram below. Burnt-out transistors and other components are determined visually or using another multimeter.

Electrical diagram

Modes and maintenance

Multimeter dt 830b digital multimeter how to use - it’s easy to figure it out with the help of the information presented in the publication. If you incorrectly select the voltage measurement mode with connection to a current circuit break, the protection blocks overloads. The reverse action will damage the device. You should carefully prepare, check the sockets and probes along with the switch position before performing work operations. Setup or other special maintenance is not provided for by official instructions.

When to change the battery

In addition to the disappearance of the main indication, the need to install a new battery will be indicated by an icon with the image of a “battery” or “+-”.

Device information

The DT830B model is a multifunctional measuring instrument - a multimeter, which is widely used among electricians. Using this universal tool, you can determine the required parameters and electrical characteristics in the shortest possible time.

The main difference between the DT830B digital device and analog instruments is the ability to measure many parameters, and all obtained data is presented in digital format. All elements of the circuit are placed in a small case, on the front of which the main switch is installed in the center. It is the main control element and covers approximately 20 positions.

There are icons around the circle indicating the corresponding operating modes. All obtained measurement data is displayed on a digital liquid crystal display.

Video lessons on the topic

And finally, we advise you to review how to properly use the most popular multimeter models. Perhaps you bought just one of the devices listed below and the visual instructions will show you how to use exactly the purchased version of the meter!

This concludes our instructions. We hope that our material helped you learn how to use the basic modes of a universal device and now you know how to use a multimeter at home and what you need to measure resistance, voltage and current in a circuit!

We recommend reading:

Types of devices and their features

As the name suggests, the tool has extensive functionality. It helps to measure several parameters at once - voltage, current, resistance, etc. Using a multimeter, you can check the integrity of the electrical circuit and detect defects that require repair. Electricians have a professional term for this procedure - “diagnosis”, since the operation of the device is accompanied by a sound or light signal.

Before you start using the multimeter, carefully study its design. There are 2 main types of devices: analog (aka pointer) and digital. Multimeters of the first category are well known to electricians with considerable experience. In Soviet times, pointer devices were called avometers and “tseshki”. Such testers provide stable readings and do not respond to interference. Bonus: low price.

With the advent of digital technology, analog multimeters have become obsolete. This is facilitated by a considerable number of disadvantages of pointer instruments:

• low sensitivity of the avometer;
• tendency to mechanical stress;
• significant error in determining the data;
• difficulties in work for beginners;
• the need to strictly maintain polarity.

In comparison with a dial multimeter, its improved digital “ancestor” has one significant drawback - sensitivity to interference (radio, electromagnetic). But it has more advantages:

• high performance in any position;
• small error - from 0.1 to 1%;
• convenient display of data;
• lack of connection between polarity and voltage indicators.

Resistance measurement

Measuring resistance with a multimeter is one of the simplest tasks, as it eliminates working with voltage. Before taking measurements, the equipment must be de-energized. Failure to do this may result in damage to the tester and electrical injury to the user. More expensive devices are equipped with protection against measuring resistance under voltage and in case of such a situation they display an error on the screen.

An incorrectly selected measurement limit will not damage the tester, so you can initially set any value. If numbers close to 0 appear on the indicator, you need to reduce the value. If the multimeter does not respond to the resistance test, then the measurement limit should be increased.

Multimeter probes have internal resistance, which introduces its own error, so before measuring the resistance, you should short-circuit the probes and remember the value shown on the screen. In subsequent measurements, it is necessary to subtract the value of the internal resistance of the probes to increase the accuracy of measurements.

A feature of insulation resistance monitoring is the influence of human body resistance on the error. In the case of measuring small resistances, a person can hold the multimeter probes by the non-insulated part. This will not lead to a significant deviation from the actual value. In the case of measuring resistances of more than 1 MOhm, human touch, especially with wet hands, makes the measurements inaccurate.

How to use a multimeter correctly: general definitions

These devices are designed to measure current, voltage, resistance and other electrical parameters. There is no point in disassembling the device, since modern equipment of this class is highly complex. Its repair is impossible without professional skills and specialized metrological equipment.

Previously, only pointer instruments were used

But using digital devices is easier. It's easier to read the readings from the screen. Do not have a strong influence on the vibration measurement process. The absence of mechanical moving parts increases durability.

When choosing a model, pay attention to the following parameters:

• Measurement limits and discreteness.
• The display is of sufficient size and backlit.
• Shape, size, weight.
• Equipment that increases the level of comfort.
• Additional functionality.

Retractable stand allows you to install the device in a convenient position

If properly equipped, the multimeter can be used to measure room temperature

Good ergonomics ensure a secure hand grip. Damping pads increase resistance to mechanical stress

This device performs the functions of a multimeter and oscilloscope.

Analog multimeters

The indicator of an analog multimeter is a magnetoelectric measuring system. To work with different voltages, a built-in set of additional resistors is used. The shunts included in the device help measure current over a wide range. The tester can work with both direct and alternating voltage, thanks to the presence of a rectifier implemented on a diode bridge.

An analog meter has a built-in power supply to make resistance measurements. The supply voltage of multimeters is in the range of 1.5 - 3 V. Batteries, as a rule, are disposable and must be replaced after discharge.

Appearance of an analog multimeter

There are several disadvantages when using an analog multimeter:

• difficulty reading information;
• nonlinearity of the measuring scale due to the properties of the magnetoelectric measuring system;
• correct connection polarity is important;
• a reverse scale is used to measure resistance;
• low measurement accuracy.

Analog devices have been almost completely replaced by digital ones, but they continue to be used by experienced craftsmen at service centers and home craftsmen. They are mainly used not to measure specific quantities, but to indicate the presence or absence of current, voltage, and resistance.

Operating modes

The desired operating mode is set by the switch by placing its handle opposite the corresponding sector:

DCV. Additionally divided into five ranges. This sector is intended for measuring DC voltage in the range 0-500V. Maximum voltage occurs infrequently, for example during TV repair

When the switch is set to 500V, an HV warning icon will appear in the upper left corner of the display to indicate the maximum level and the need for attention and caution. If the voltage value is unknown in advance, switching is performed from the maximum position with a gradual transition to lower values

Failure to comply with this condition may lead to inaccurate readings or failure of the device. ACV. Designed for measuring alternating voltage. The sector is divided into two parts - 200 and 500V. When using the 220-380V range you need to be extremely careful. The procedure is the same as in the previous constant voltage sector. DCA. This sector performs the function of a milliammeter and is intended for measuring small direct currents. It is not recommended to use this sector unless necessary, and caution should be used when measuring large currents. In this case, you need to ring the chain for no longer than a few seconds. hFE. The sector performs continuity measurements of transistors and checks for breakdown or breakage. Elements are tested regardless of their conductivity. The legs of the transistors must be placed in the appropriate sockets, as indicated on the special socket. DIODE sector. When the diode is working properly, the voltage drop in the forward direction is shown in the range of 400-700 mV. For the reverse direction, infinity is used. If the diode is faulty, then a value close to zero means a breakdown, and one close to infinity means a break. OM sector. Used for resistance measurements. The measurement range is in the range of 200-2000000 Ohms. You should take into account the errors of the Chinese multimeter and its too high sensitivity when making accurate measurements. It is imperative to take into account the resistance that occurs when the probes are connected to each other. This is especially true when measuring resistances that are too small.

Instructions describing measurement modes

In the standard configuration of the dt830b multimeter, the instructions for use explain the features of working with different modes. Below are the nuances that deserve special mention.

Continuity of chain sections

Clamp meter

In this mode, the integrity of the electrical circuit is checked. It is used to monitor the functional state:

• PCB tracks;
• cable products;
• connectors and connections.

Important! This model does not have an audible alarm.

Testing ~U values

The connectors are connected to the sockets intended for measurements: general and universal. If you use a 10 A input, high AC voltage may damage the device by causing a short circuit. Polarity does not matter in this case. Certified accuracy is maintained in the frequency range from 40 to 400 Hz, which is quite enough to work with standard power supply networks.

Dependence of quantities

DC voltage measurement mode

In this mode, the input electrical resistance is 10 MΩ. Overload protection is triggered at a level of 200 V for lower measurement limits. The switch is set to the DCV position. When a minus is indicated on the display, the polarity is changed.

Dependence of quantities

DC current measurement (up to 200 mA mode)

If the parameters are unknown even approximately, it is better to start with the maximum range (10 A). This approach will help preserve the fuse.

Dependence of quantities

DC current measurement up to 10A

Overcurrent protection is created using a fuse. It should be remembered that there is no such component in the circuit for measuring up to 10 A.

Resistance measurement

The official dt 830b instructions recommend disconnecting equipment from the network when measuring resistance. The indication “1” indicates overload, so choose a larger range. If “0” is shown, switch the handle in the other direction.

Dependence of quantities

Monitoring the health of diodes

If you connect the diode in the forward direction, the serviceability of the product is indicated by the indication of the voltage drop across the semiconductor junction in the range from 350 to 750 mV. The polarity change should be indicated by the overload sign “1”.

hFE sector

Using this connector you can find out the current gain. The letters pnp and npn will help you correctly install the semiconductor device into the socket.

How to measure with a multimeter.

How to measure current with a multimeter.

This model allows you to measure a maximum of 10 Amps. To determine the current consumption, connect a multimeter in series to a household appliance, as shown in the picture.

Most often it is done as follows: the device is connected to the break of one phase wire going to the consumer being measured.

Attention, if a separate terminal is provided for measuring current above 200 mA, do not forget to move the probe to the appropriate place

How to measure voltage with a multimeter.

In a home electrical outlet, a multimeter can only measure alternating voltage with an upper limit of 700 Volts. Power supplies and batteries must be measured observing polarity in the DC voltage measurement mode, setting the upper limit with a margin.

How to test a battery with a multimeter.

I’ll say right away that in order to effectively check a car battery, you need a special load plug that measures the voltage under load, otherwise you will not be able to qualitatively determine the condition of the car battery.

For ordinary AA batteries, to check the condition, you need to set the switch to the maximum limit for measuring direct current and literally short it with a wire for no more than half a second in order to have time to see the readings on the screen. Do not hold for more than 0.5 seconds. - this causes breakdown or deterioration in the performance characteristics of the battery.

For 1-2 volt batteries in good condition, the short circuit current must be at least 2 Amperes. If it is less than 1 Ampere, then you will have to buy a new one or use it for control panels for household appliances in the house.

How to measure resistance with a multimeter.

I want to say right away that you cannot measure the resistance either in the socket or in the battery. But you can easily recognize it from a light bulb or heating element of an electric kettle or heater; this is required to determine their integrity or performance.

Attention! Before measurement, you must disconnect all wires from the device being measured! In this mode, live devices cannot be measured!

Advice! You can even measure your body's resistance, just take the multimeter probes in different hands. It is completely safe and will not harm your health.

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Using the device when measuring AC voltage

The measurement in this case is usually carried out in accordance with the same principle as the measurement of direct voltage. It is necessary to switch the device to a special mode and select the appropriate voltage limit. After this, the probes are connected to an alternating voltage source, and the resulting readings are taken from the indicator.

How to measure DC voltage with a multimeter

Make sure the probes are connected correctly.

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Switch to constant voltage mode. It is usually denoted by the symbols V with a straight line and a dotted line, or DCV.

In multimeters with manual range selection, additionally set the approximate measurement value, or preferably one step higher. If you are not sure, start with the maximum and gradually lower.

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Touch the probes to the contacts and look at the screen. If a minus sign is displayed along with the number, it means that the polarity is reversed: the red probe touches the minus, and the black probe touches the plus.

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In a hand-held multimeter, you may have to adjust the measuring range.

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If the display shows a unit, you need to increase the measurement limit; if it is zero, the OL or OVER symbols need to be lowered.

External structure and functions

Washing machine hw60-bp12758: reviews, operating instructions, specifications, photos

Recently, specialists and radio amateurs mainly use electronic models of multimeters. This does not mean that switches are not used at all. They are indispensable when electronic devices simply do not work due to strong interference. But in most cases we are dealing with digital models.

There are different modifications of these measuring instruments with different measurement accuracy and different functionality. There are automatic multimeters in which the switch has only a few positions - they select the nature of the measurement (voltage, resistance, current) and the device selects the measurement limits itself. There are models that can be connected to a computer. They transfer measurement data directly to a computer, where they can be saved.

Automatic multimeters have only types of measurements on the scale

But most home craftsmen use inexpensive models of the middle class of accuracy (with a bit resolution of 3.5, which ensures an accuracy of 1%). These are common multimeters dt 830, 831, 832, 833. 834, etc. The last number shows the “freshness” of the modification. Later models have wider functionality, but for home use these new features are not critical. Working with all these models is not much different, so we will talk in general about the techniques and procedures.

Structure of an electronic multimeter

Before using a multimeter, let's study its structure. Electronic models have a small liquid crystal screen on which measurement results are displayed. Below the screen there is a range switch. It rotates around its axis. The part on which the red dot or arrow is marked indicates the current type and range of measurements. There are marks around the switch that indicate the type of measurements and their range.

General structure of the multimeter

Below on the case there are sockets for connecting probes. Depending on the model, there are two or three sockets; there are always two probes. One is positive (red), the second negative is black. The black probe is always connected to a connector labeled “COM” or COMMON or that is labeled “ground.” Red - into one of the free slots. If there are always two connectors, no problems arise; if there are three sockets, you need to read the instructions for which measurements to insert the “positive” probe into which socket. In most cases, the red probe is connected to the middle socket. This is how most measurements are carried out. The upper connector is necessary if you are measuring a current of up to 10 A (if more, then also in the middle socket).

Where to connect multimeter probes

There are tester models in which the sockets are located not on the right, but at the bottom (for example, the Resanta DT 181 multimeter or the Hama 00081700 EM393 in the photo). In this case, there is no difference in connection: black to the socket with the inscription “COM”, and red, depending on the situation - when measuring currents from 200 mA to 10 A - to the far right socket, in all other situations - to the middle one.

The sockets for connecting probes on multimeters can be located at the bottom

There are models with four connectors. In this case, there are two sockets for measuring current - one for microcurrents (less than 200 mA), the second for current strength from 200 mA to 10 A. Having understood what is in the device and why, you can begin to figure out how to use a multimeter.

Switch position

The measurement mode depends on the position of the switch. There is a dot at one of its ends, it is usually tinted white or red. This end indicates the current operating mode. In some models, the switch is made in the form of a truncated cone or has one pointed edge. This sharp edge is also a pointer. To make your work easier, you can apply bright paint to this pointing edge. This could be nail polish or some kind of abrasion-resistant paint.

Position of the measuring range switch on the multimeter

By turning this switch you change the operating mode of the device. If it stands vertically up, the device is turned off. In addition, there are the following provisions:

• V with a wavy line or ACV (to the right of the “off” position) - AC voltage measurement mode;
• A with a straight line—DC measurement;
• A with a wavy line - determination of alternating current (this mode is not available on all multimeters; it is not present in the photos above);
• V with a straight line or the inscription DCV (to the left of the off position) - for measuring DC voltage;
• Ω - resistance measurement.

There are also provisions for determining the gain of transistors and determining the polarity of diodes. There may be others, but their purpose must be found in the instructions for a specific device.

Multimeter screen

Household tester models have monochrome LCD (liquid crystal) screens, most often without backlight; they differ in the number of characters displayed; the most common are models with four digits. In this case, usually not all 4 characters can be in the range from 0 to 9, more often the first digit can be 0 or 1, but the remaining three can be from 0 to 9 each.

The larger the display range, the more accurate readings you will get. But this should not be confused with the error or accuracy of measuring instruments; a tester with 5 digits and 4 displayed can perform measurements equally accurately, but with the first one you can see more digits of the value, for example, after the decimal point, when like a device with four digits, the extreme will not show the number by rounding its value.

The display can also display various additional information, such as battery charge, selected measurement mode, etc. In addition, a minus sign is necessarily shown if the value is negative.

Multimeter dt 838 instructions for use. Multimeter dt830b instructions for use

The small-sized measuring multimeter DT 838 is a multifunctional device. At the moment, the DT 838 digital measuring multimeter is the most affordable and widespread. It is used not only by professionals, but also by amateurs both in our country and in many countries around the world.

It gained its popularity due to its low cost, reliability, ease of operation, convenience and small size. All these digital devices are manufactured at numerous industrial electrical factories in China, under different brands.

These brands are unique to different regions of our planet, but all models have the same internal structure and differ only in workmanship and equipment. When buying a DT 838 multimeter, the instructions that come with it will come in handy.

By the way, it fits such popular models as M-830B and DT 832.

Its only significant drawback for professionals is its low measurement accuracy. Although for domestic needs this is quite enough. At home, such a device allows you to ring wires, semiconductor diodes, measure the presence of voltage and current, check transistors, high-capacity capacitors, measure resistance and temperature.

This equipment is based on the principle of double integration of a microcircuit of the ICL7106 type (this is an analog-to-digital converter). The ICL7106 type microcircuit is similar to our domestic K572PV5 microcircuit. Such an analog-to-digital converter includes differential inputs that are used for the input signal and for a reference voltage reference.

This design of the microcircuit allows you to measure voltage without being tied to the power source of the microcircuit itself, which eliminates common-mode interference both in signal circuits and in the reference voltage circuit. You can read about the detailed internal structure and possible applications of this type of microcircuit on the Internet.

The DT 838 multimeter is manufactured according to classical circuits for the type of analog-to-digital converter used, with precise resistor dividers for all measuring modes. If the device fails, it is recommended not to repair the device, but to buy a new one, since it is quite cheap.

Specifications

Despite its wide functionality, the DT multimeter still lags behind professional instruments, losing to them in measurement accuracy and service life. However, the high sensitivity of the multimeter provides good measurement results, and in terms of basic indicators it is only slightly behind more expensive devices.

The DT830B multimeter is designed for a constant current of 10A, the maximum constant voltage is 1 kV. The AC voltage is in the range of 200-750 V. The liquid crystal display has a resolution of 3.5, which is a good indicator. The maximum resistance limit that can be measured is 200 kOhm. The device operates normally at temperatures of 0-40 degrees.

The dimensions of the multimeter are 126x70x28 mm. The device itself is very light and weighs only 137 grams. Compared to professional models, the number of functions is somewhat limited. However, if we take other household testers for comparison, the DT830B digital multimeter is noticeably superior to them, thanks to emergency indicators, an extended measuring scale, a diode tester and other additional options.

To perform measurements, the DT830B is equipped with probes, each of which is plugged into the corresponding socket. They are made in the form of metal rods with handles covered with insulation. The main function of the probes is to ensure contact between the area being measured and the device itself. The probe connector is selected in accordance with the parameter that needs to be measured.

For example, the COM connector is considered common. It includes a probe with black wires, which remains in this position during any manipulation. The other two sockets are for a probe with a red conductor. If you need to measure voltage, resistance or current up to 200 mA, then use the VΩmA connector. When measuring currents above 200 mA, use the 10ADC connector. After contact is established with the object in the desired mode, all information about the measured parameter will appear on the display.

Technical features

Voltage tester

Common parameters:

• indication – liquid crystal display (3.5 digits);
• automated determination of units of measurement, polarity;
• overload indicator with built-in protection for each limit;
• number of switch positions – 20;
• frequency of measuring actions – from 2 to 4 per second;
• measuring range el. resistance – from 0.1 Ohm to 2,000 kOhm;
• rated current for testing transistors – 100 µA;
• Height x Width x Depth in mm – 126 x 70 x 28;
• Weight (without battery) – 137 g.

How to use a digital multimeter

For example, let’s take a not-so-complex multimeter that has all the necessary measuring functions. This example will be quite enough to learn how to use any other digital multimeter. What is a multimeter? It is a device on the body of which there are controls and controls:

1. mode switches and selection of the measured value 2. sockets for connecting test leads (probes) 3. indicator for displaying information obtained during measurement

All Multimeters are very similar; in the center of the case there is a “twist” operating mode switch. Around the switch there are sectors in which you can select, by rotating the switch knob, those values ​​that you need to measure at the moment. The sockets intended for connecting measuring probes are marked:

10A - VΩmA - COM

COM socket - is common for all measurement parameters and the negative (-) probe (black) of the device.

The VΩmA socket is a common socket for measuring all quantities and is the positive (+) probe (red) of the multimeter.

Socket A - it is necessary to connect the positive probe to this socket when measuring the value of direct voltage current above 2 Amperes, but not more than 10 Amperes.

Equipment

The device is equipped with only the most necessary elements. Supplied in clear plastic packaging. The kit includes:

1. The tester itself.
2. Measuring probes - 2 pcs.
3. Battery power.
4. Instructions for use.

The instructions are on a separate sheet, and the characteristics of the device are indicated on the back of the package. All information is available in Russian.

Definition of resistance and “continuity”: instructions

This is one of the simplest and safest procedures, because you have to work with de-energized elements. To use a multimeter to determine resistance, you need to do this:

1. First you need to connect the probes: red - in VΩmA (VmA), blue or black - traditionally in COM.
2. Then you need to set up the multimeter by selecting the Ω mode and the maximum value range on the switch.
3. After this, it is advisable to check the condition of the device. Connect the ends of the probes to each other. The multimeter is working if you see “0” on the screen.
4. Now apply the free ends of the probes to the object in which you want to determine the resistance. If everything is done as it should, and the range of values ​​is selected correctly, you will see readings in Ohms on the multimeter display.

You can check the integrity of wires at home just as easily and quickly. Select the diode test mode on the multimeter and turn off the power to the object being studied (for example, an extension cord). Place the connected probes on the wire. You will hear a beep - everything is intact. A break will be indicated by a mark on the device screen.

Transportation and storage rules

During operation, it is recommended to follow basic rules for handling electronic equipment. Excessive mechanical loads are prevented during transportation. To extend service life, do not store the product in conditions of high humidity (normal range is up to 80%). The device should be used indoors at positive air temperatures up to +40°C.

The information provided in this publication will help you perform measurements correctly and safely. For dt 830b, instructions in Russian are available on the manufacturer’s website, so its absence in the accompanying documentation will not cause any difficulties. Careful handling and correct selection of modes will help maintain the good functional condition of the device over a long service life.

Some recommendations

It is not difficult to understand how to use a multimeter (tester) correctly; the main thing is to set the necessary parameters on the digital device and connect the probes correctly

You should also pay special attention to choosing a multitester and follow some recommendations:

1. Most Chinese multimeters, including the popular DT9205A model, have fragile probes. They can be strengthened using cambrics or holding tubes. They will ensure that there are no kinks near the clamps and will extend the service life of the device.
2. You need to start measuring from larger values ​​to smaller ones, this will avoid blowing the fuse inside the multimeter.
3. If the device does not turn on, the cause may be a dead battery. You can buy it in any specialized store, calling the subtype “Crown”.
4. You can rotate the switch in any direction if you did not have time to connect the probes to the circuit or device being tested.

Learn to use a multimeter and determine short circuits, measure DC and AC current readings, as well as other parameters in everyday life will become much easier.

How does a multimeter work?

This digital device is created on the basis of a specialized microcircuit. The main element does:

• processing of measured parameters using amplitude-digital conversion with double integration;
• display control;
• protective and warning functions.

Resistors and other additional components are needed to step the current and voltage. The rotary controller switches the electrical circuit to the desired measurement range. Power supply is self-contained from a replaceable Krona battery (9V).

Appearance and connectors

The multifunction measuring device dt 830b is equipped with a liquid crystal display. This solution helps save energy, so the standard battery will last for a long time. An additional advantage is resistance to overloads. The dial indicator can be damaged by surge voltage. In a similar situation, the multimeter will display an excessive value of one in the most significant digit.

Connectors

The connectors are marked in the picture:

1. block for testing transistors;
2. bypass input, which is used to measure high currents up to 10 A;
3. universal input for measuring electrical resistance, voltage, current;
4. common conductor (COM, “ground”).

Multimeter controls

Using the technique does not cause difficulties even for beginners. For storage and transportation, the switch is set to the “OFF” position. In this case, the power is turned off, no energy is consumed, and the indicator is off. The required position is selected by turning the handle. The picture above clearly shows the color selection:

• separate groups of measured parameters;
• warning notices;
• cables and connectors.

For your information. It is recommended to change the range step by step from larger to smaller values ​​to avoid overloads.

How to use an analog multitester

The analog tester uses a general indicator to display the measured readings. On the scale behind the arrow there are several divisions: for volts, amperes and ohms.

The tester works on the principle of converting measured data into electricity, which creates a magnetic field, which in turn moves the needle. In this case, switching of input connectors and control of operating modes of the circuit is realized using a multifunction switch with buttons. A similar “handle” is also provided on digital versions.

Instructions for use of the analog tester

Let's look at how to use a dial multimeter and set it up to work:

1. Check the batteries using a special mode.
2. Perform a zero calibration. For these purposes, there is a tuning resistor, the handle of which is located on the front panel. It is also used when moving from one range to another. For example, changing the position from 10 Ohm to 10 Mohm, the spread is up to 25% of the scale length.
3. Set AC or DC voltage. (The device contains a diode rectifier, since the magnetic head of the dial indicator functions only with direct current).
4. Activate the shunt, which helps measure resistance over wide ranges on the sensing pointer mechanism.
5. To select a measurement value, you must connect the device to the correct connectors, and you must observe the switching. If you do not follow all the rules for connecting to each section of the circuit where the current strength is different, the multimeter will fail.
6. The connection between the device and the circuit is carried out using probes or clamps similar to crocodiles, which are named accordingly.

Working panel

All device controls are located on the front panel. Before using the multimeter, you need to study all the symbols on the function switch. The work panel is equipped with:

1. LCD display.
2. Round functionality switch.
3. The “common” socket is black, for connecting to “0” or “–”.
4. The “V, Ω, mA” socket is red, for connecting to “phase” or “+”.
5. The “10A” socket is brown. Necessary for measuring high currents.

Important! You should carefully connect the test leads before operation. An error may cause the fuse to fail.

Possibilities for improving the device

The instructions for the DT-830B multimeter provide a certain number of functions. The models differ slightly from each other, and if desired, you can improve any of them, for example, add measurement of capacitance of the capacitor, temperature and all the other additional functions listed earlier.

The description of the DT-830B multimeter in advertisements and reviews is quite true.

Classification of multimeters

Multimeter mastech m890c+

There are two main groups of testing instruments (multimeters). Some of them are called analog. A multimeter of this type is distinguished by the presence of a dial with a scale. Readings are taken visually when the arrow, deviating from the “zero” position, points to specific numbers. Such systems are already outdated. Therefore, everything that will be discussed further concerns a new type of devices - electronic. It’s more convenient to work with them, there are more possibilities, the readings are accurate, the error is smaller.

How to use an analog type tester is described in another instruction. Nowadays they are rarely used, because when taking readings, for example, voltage, the degree of error is too great. Initially the measurements are plausible, but are shown with deviation. But here we need to add the human factor, when the eye does not always catch the minimum deviation of the arrow. Digital devices are not afraid of vibration. The readings do not depend on mechanical vibrations. The indicator clearly indicates the value of the measured parameter.

Reviews about the device

Reviews about a device such as the DT-830B digital multimeter are mostly positive. It is unpretentious, multifunctional, and the battery lasts for years. Everyone is satisfied with the low price of the device. Comments appear only on trifles.

The probes should be replaced as they fail quite quickly. Their resistance is close to standard and is 0.5 Ohm.

Types of multimeters

It is important to know that multimeters with different sensitivity ranges are used for different purposes. It is this most important parameter that determines the scope of use of each specific model. A multimeter used to measure the voltage of the cells in a car battery will not be able to measure the low-voltage voltage of current sources, since their values ​​are expressed in millivolts. At home, a multimeter is used to measure fuses, sockets, incandescent lamps, heating elements, integrated circuits, transistors, and automotive electronics. All these measurements are easily handled by a digital multimeter, which is most popular among home craftsmen.

Household digital multimeters differ from each other in appearance, measurement accuracy, calculation algorithm, and the presence of various capabilities

The name multimeter itself most accurately describes the purpose of this multifunctional device. There are so many varieties of testers that anyone can purchase a model that meets their requirements for this device. And requests can be for design, range of measured values, set of functions. Today's multimeter, in addition to measuring capabilities, can be endowed with the capabilities of various calculations and graphical representation of signals. Enough has already been said about digital and analogue models. Let's look at other types of multimeters.

Clamp meter

From school physics we know that a voltmeter is connected to a circuit in parallel, and an ammeter in series. To create a break in a high-voltage circuit to measure the current, clamps were invented. The first versions of electric clamps were presented in the form of a transformer, with an ammeter connected to the secondary winding. The readings of such a device had to be recalculated, so when measuring the current strength the influence of the transformation ratio was not taken into account. These clamps could only measure alternating current; they do not work with direct current. In modern current meters, instead of an ammeter, there is a Hall sensor, which is capable of detecting and recording the presence and field strength of both alternating and direct current.

The DT-266FT current clamp meter is a low-cost popular series designed for AC current, DC and AC voltage measurement, resistance measurement, diode testing, frequency measurement

There are two types of measuring clamps: professional ones for measuring networks with voltages above 1000 V and household ones - voltages below 1000 V. The design of devices of this type is constantly being improved today, with their help the following complex problems are solved:

1. Measurement of current strength on any part of the network under voltage.
2. Determination of the actual power consumption of any electrical device connected to the network.
3. Measuring the actual load in the electrical network of a house or individual apartment at this time.
4. Detecting illegal connections to the power grid.
5. Checking household appliances for insulation breakdown and current leakage to the housing.

Video: how to use a multimeter and current clamps DuMa8819

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D.C

To measure direct current, we used the same Krohn battery and a 100-watt light bulb, connecting them into one circuit. The indicators were as follows:

As you can see, the scale of the Ts 4342 shows 63 mA, and the DT-830B shows 61.8 mA. Considering that the Soviet device also has some error, we believe that the “Chinese” showed direct current accurately.