Electric multimeter: a tester for measuring electrical

In this article you can find out what the electric meter: a tester that can measure the strength of the current, AC and DC voltage and resistance. Consider what devices have additional features such as a measurement gain of the transistor, diode test, electrical continuity test circuit, the electrical measurement signal frequency, temperature and parameters of the capacitor, inductance coils.

Electric multimeter: a tester for measuring electrical characteristics

For measuring electrical parameters are often used universal multimeters (Testers), clamp meter DT 266, which is a portable compact device model. All multimeters have a similar structure except for some distinctive features. Neutral tester consists of:

• LCD display;

• rotary measurement mode switch;
• three connectors for probes;
• socket for connection of the transistor;
• On / Off button.

The main body of the digital multimeter (tester) scale is designations measured values ​​and their maximum values. By turning a switch, you can choose one of them:

• DCV - DC voltage measurement;
• ACV - AC voltage measurement;
• Ω - impedance measurement;
• DCA - DC measurement;
• HFE - measuring parameters of the transistor;
• diode sign - check continuity or diodes

The device is equipped with several sockets to connect the red and black leads. Probes included, but are often of low quality elements. If they fail, you can make the test leads to a multimeter with their own hands, for example, buildings and pen tip darts. To measure the quantities they need to be properly attached, or can be derived from the meter system. Black test lead should be connected to the COM jack and the red is connected to the connector 10A to measure current over 200 mA, and the jack VAΩ, when the measured voltage, resistance, current 200 mA, and when done continuity.

How to use a multimeter

Before proceeding to the measurement of electrical quantities, check the device. It must be parallel with another tester or voltmeter connected to a power outlet and check readings. To verify the accuracy of the resistance measurement should be taken from the device marking and compared with an indication of the tester. To verify the accuracy of measurement of the current strength indicator should spend alternate measurement equal load the equipment and an ammeter.

On an example multimeter DT 832, manual which contains a detailed description of all the manipulation with the device, consider the basic modes of operation of the device.

resistivity scale can be used for such purposes as prozvanivat transformer multimeter determine resistance resistor, to identify faulty components, which shows low voltage, reverse resistance of diode resistance heating element.

To measure the resistance necessary to install the rotary switch to the corresponding sector Ω. If the estimated value is unknown, the switch is set to the lowest value, which corresponds to 200 ohms. If the display shows "1", this indicates that the resistance is bigger, so you must go to the next level. Measurements as long as the correct information is obtained.

Note!It should be remembered that prior to the measurement of resistance, it is necessary to make sure that there is no power in the network. Otherwise, the device Buda issuing false value.

To measure the alternating voltage necessary to forward the switch on the sector V ~ or ACV, which consists of two positions 200 and 750 V. Measurements begin from a higher value. If the result was small, whereas for more accurate measurement is worth go to the lowest position. The black lead is connected to the COM jack and the red VAΩ. In the measurement of the indicator optionally correct polarity.

To measure the DC voltage multimeter switch is set to V DCV or sector, where the scale is divided into 5 bands. The measurement should start with the largest value of 1000, and gradually lower it to obtain the correct result. If you do not follow this rule, the device may malfunction.

DC measurement should be done with extreme caution and care. To do this, you must set the switch to the desired sector DCA. Now it is necessary to attach the probes correctly. Black is still inserted into the socket COM, and the red should be set VAΩ, when the estimated value of the current does not exceed 200mA. If the current is higher than that, then the probe is set to 10A. If you confuse the situation, you can burn the multimeter.

Starting current measurement should multimeter with maximum measurement threshold, gradually reducing it to obtain the desired value.

Important!For carrying multimeter current measurements must be connected to the circuit in series, and a resistance to stress - in parallel.

Temperature measurement is performed with a multimeter using a thermocouple which is connected to the instrument probe in place.

When working with electrical engineering is sometimes necessary to determine the inductance. Find tester with this feature is quite difficult. To do this, you must use a special prefix. As such an element for measuring the inductance suitable digital multimeter tester having a threshold voltage measurement accuracy of 200 mV.

How to ring wires multimeter

When it is necessary to determine the performance of the equipment or repair electrical wiring, the first thing to do is to ping the cable and wire tester. It directly detects a possible break in the circuit, the resistance and a short circuit.

Useful advice!For continuity wires do not have to use a model with this feature. For this fit inexpensive multimeter with minimal opportunities.

First, you must install the switch on the diode symbol. Red probe should be installed in Ω connector, black - COM. Next, to verify the instrument necessary to close the ends of the measuring probes to each other. It should ring out a characteristic signal. Now you are ready to wire continuity. To do this test leads to touch the exposed metal of the cable or wire. The integrity of the wire indicates a sound signal. In this case the screen displays the resistance value or "0". If the audio signal is absent, and display the value "1" on the display, then check wire is interrupted.

Next, consider how prozvanivat multimeter multicore cable. To this end, each end should be cleaned and separated into strands. Now you need to check for a short circuit in each core. Here sound represents the presence of veins between the short-circuit. This is especially important when working with high voltages.

Now, check the integrity of all living. The strands of one end of a cable are twisted together, and at the other end of each unit is checked. If the audio signal is present at least once, the integrity of the conductor is broken.

Measuring capacitance capacitor multimeter

The most common cause of failure of electronic equipment is a failure of capacitors, which are part of the board. To identify the weak link, it is necessary to ring each of them with a multimeter.

Before you check multimeter capacitance, you must fully discharge it, otherwise it may damage the meter. To defuse the low voltage device must be short-circuited his conclusions, and for high-voltage a capacitor with a large capacity must be used for 5-10 kohm resistor, which is connected to device.

Defective capacitor has a capacitance not less than 0.25 mkFarada. Before check multimeter capacitance, the device should be put in the measurement mode corresponding to the desired limit. If the tester is equipped with special landing slots, insert them in the condenser.

How to check the multimeter capacitor, not vypaivaya it from the board? To do this, you must attach them to the meter and touch the capacitor terminals. It should strictly observe the polarity. Otherwise, the device will fail immediately. Screen displayed on multimeter capacitance value, which should be close to the nominal. If it is not, it is faulty capacitor.

Important!It should be remembered that capacitor manufacturers always tick tick minus pin on the device.

How to ring capacitor multimeter if there is no function of measuring its capacity? This requires the transfer device in the resistance measuring mode and touch probes to their respective polarity outputs. The display tester displayed value that will continue to grow. It comes from the fact that the meter by contacting the capacitor charges it. After some time, the screen displays "1", which tells about the working condition of the device.

If the first test appeared on the screen the number "1", it means that the capacitor is broken, and he had failed. If you see a "0", the device is shorted.

A more detailed progress measurements you can see on the video - how to check capacitor multimeter.

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As prozvanivat multimeter resistors

Resistor - is an electronic element with a variable or specific electric resistance value. Before ping resistor multimeter, it is necessary to visually inspect the presence of cracks and chipping on the chassis. If there is no visible damage, then you should proceed to the verification element. To do this, you must use the concept, based on which the measurements are carried out at the control points, which shows the values ​​needed.

The most common way is to check the multimeter resistor is a measurement of resistance, which should be close to the nominal. To do this, the tester switch is set to the appropriate position. Red probe is connected to the connector VΩmA, and black - COM.

Before ping resistor, it is necessary to identify the good condition of its wiring. Short them together. The instrument should display "0". Now you can go to the measurement resistor. If the display shows "1", the resistor is defective. If other value is displayed, it is compared with a nominal given tolerance. The resistor is OK if the values ​​match.

How to check resistor multemetrom not vypaivaya it from the board? You can use proring mode. If a defective element, the characteristic sound signal.

The use of the meter in the home

With the tester can diagnose many electrical components and thereby identify the problem.

Before ping TAN multimeter should know his resistance, which will be compared with the indication of the tester. To do this, use the formula R = U2 / P, where U - supply voltage, P - power, which is indicated on the device.

For the measurement, set the switch to the desired range for the measurement of resistance. Multimeter probes attach to the body of the domestic appliance and to the output terminals of PETN in turn. If the display shows a value close to that obtained from the formula, if the heater is not defective. The value "0" according to a short circuit inside the helix, and an infinite value or "1" indicates that the spiral broken.

Often the question arises: how to ring a multimeter electric household appliance? Since there are several types of engines, check of operation of the unit will be different.

Before you check the multimeter electric motor, it is necessary to conduct its external examination, touch hands to metal surfaces.

Before testing is necessary to completely disconnect the device. Tester put in an ohmmeter mode, switch to the maximum measuring range. How to operate multimeter, video in the article clearly shows the sequence of measurements to check the operation of the engine.

Today, many light fixtures are equipped with advanced light sources such as LEDs, which can occasionally fail. It was then that there is an important task as a multimeter to check the LED. To do this, use the tester with the regime continuity, which check that the diodes. It should strictly adhere to the polarity of the LED.

Red probe device is connected to the anode and the cathode black. If done correctly, the working LED will begin to glow. Note, however, that the continuity in the working mode, the meter has a low current, therefore, the diode can not react. This should reduce the lighting to see clearly diode illumination. Also on the good condition element indicates the value displayed on the tester display, which differs from 1.

Useful advice!Here, at the same time you can check the multimeter LED power calculating this parameter on the basis of the results obtained.

Using the tester can detect two defects in a simple and current voltage converter. Before you check multimeter transformer, it is necessary to know the findings of its windings. Next, using the measuring device to ring each winding device ohmmeter mode. If the tester 1 is displayed, it indicates an open coil.

To detect circuit, a probe tester should relate to the conclusion of the winding, the other alternately connect with the findings of other windings and the housing. Short circuit should not be here.

How to check the battery capacity of the multimeter

Rechargeable batteries are used for storage and supply of electricity consumers in the autonomous mode. Using a multimeter can check the operating voltage, operating current, internal resistance, the battery electromotive force and the leakage current. Most often the question arises, how to check the battery charge multimeter.

To do this, you must provide a full charge of the battery. Next, using a powerful consumer load on the battery is created by connecting in series the battery tester and consumer. Measured current. Periodically, it is necessary to make the battery voltage measurements. Once this value starts to drop, fixed start time of the battery. Now the total time that has elapsed from the start of the test multiplied by the load current. The obtained value corresponds to the capacity of the battery.

The result after multimeter battery checked, to be compared with published data. If the value is lower than nominal, the device is not suitable for further work.

When using many appliances, some users are concerned, as the multimeter to check the battery capacity of 18650. First we need to know the nominal capacity of the cell, the value of which is usually written on the body.

In considering how to measure multimeter battery capacity, it is necessary to understand the process technology. The measuring device is transferred to the DC measurement mode in the range of 10 MA. Further, the red probe is applied to the positive battery terminal and the black - to the negative. The screen should display that is close to the nominal. Then it passes element for further work.

Once multimeter checked battery capacity, from the obtained value for the device can talk about the future member. If the result is slightly lower than the nominal, the battery can be used for a more powerful technique, for example for clock flashlight. If the value is approximated to 1 A, an element useful for remote control functionality.

If there is a question as a multimeter to check the capacity of the battery of your phone, it should be remembered that the tester shows only an approximate value. For a more accurate diagnosis should use a computer program or a special charger.

The use of a multimeter for car

Many car owners often wonder: how to check the multimeter vehicle battery with the engine running? To do this, the tester is translated into voltage measurement mode. Observing polarity, you connect the meter to the battery. If the display shows the value of 13.5-14 V, this indicates a normal operating condition the power supply. If the value is higher than 14.2 V, it is a sign of a low battery.

We now turn to the question of how to check the battery charge on the multimeter the engine off. The measurement principle is the same as when the engine is running. Normal battery life should correspond to the values ​​obtained, which is in the range 12.5-13 W. If the value is below 12, it indicates that the unit is exhausted.

One of the most important parts of any vehicle is DMRV. How to check the meter multimeter, described below. To do this, you must deal with sensor design and strictly follow the instructions.

To test the functionality of the mass air flow sensor optional to use the services of car-care center. Saving time and money, you can check DMRV multimeter. To begin, you should know pinout of the contact group. Remove the transmitter from the installation site is not necessary.

The tester is set in the DC measurement mode is up to 2 V. Check sensor DMRV multimeter, is performed in a clear sequence. Red probe touched to the yellow wire, which is responsible for feeding the incoming signal from the ECU. The black lead is connected to the green wire which is responsible for grounding. Turning the ignition key does not start the car, you must look at the readings.

Checking DMRV VAZ-2114 multimeter is successful, if the display unit shows the value not more than 1.02 V. The sensor does not work if the tester display the reading is greater than 1.05 V.

Note! To check on a multimeter DMRV 2110, how it works, you need to perform all the above actions.

Before you check multimeter camshaft sensor, switch off the ignition. Next, disconnect the device from all cables. Translate tester voltage measurement mode. Connected to the engine weight tester mass. The measurement result must match the voltage characteristic of the battery terminals. If the readings are different, the power supply circuit device is out of order. Following a similar way, measure the voltage on the sensor mass. It must be equal to 0.

Now a wire to a multimeter strong conclusion sensor and the other input connected to the control system. Scroll to the starter motor. If displayed 0.4-5 V, a work sensor to the screen.

How to check the multimeter knock sensor? The device exhibited a voltage measuring position 200 MB. Probes are connected to the contacts. Now it is necessary to hit a hard object on the apparatus body. If on the device, depending on the pin, the voltage readings rise to 40 MW, defective sensor.

Next, consider how to ring a multimeter ignition coil. First, you need to make sure in the primary winding of serviceability. For this purpose the device should be put in the resistance measuring mode and to connect the probes to the terminals "+" and "-". If the screen displays a value in the range 0.4-2 Ohm coil is working. The number 0 indicates a short circuit. If infinity is displayed, open circuit occurs.

The second stage of solution of the problem, how to check the ignition coil multimeter is proring secondary winding device. To do this, connect the multimeter test leads to the conclusion of the high voltage wires to the "+" terminal. If the coil is equipped with a plate type core, the resistance will be equal to 6.8 ohms, a different type of - 15 ohms.

A more detailed course of the measurements can be found on the video "How to check the ignition coil multimeter".

Check generator

The efficiency of the vehicle ignition systems provide two devices that are paired: generator and battery. Disruption of normal operational state one of them will lead to a decrease in efficiency entire unit.

Before you check your generator multimeter should fulfill its external examination. Then should begin testing the relay controller which maintains a constant vehicle voltage. To do this, the tester is exposed in a constant voltage mode in the range of 50 V. Using stylus respective polarity, the voltage is measured at the input terminals of the generator. It should be in the range 14-14,2 V.

If no problem is found, go to the question, how to test multimeter diode bridge. To do this you must disassemble the generator housing and perform an inspection.

In the case of the diode bridge serviceable condition check generator rotor. For this it is necessary to transfer the tester in resistance measurement mode and check for the current collector rings of the field winding. The value should not be too big.

Useful advice!When performing measurements detected short circuit or interruption, contact someone for help.

The last step is to perform continuity stator multimeter for short coils. Resistance on the appliance should be close to 1.

As prozvanivat diode bridge multimeter

In electronics, diode bridges are often used in a single package. Check their performance or to identify the damage can be a conventional tester.

Before you ping a diode bridge, the meter is set to test a diode or continuity mode. Checking is carried out in the direct inclusion. Red probe is connected to the negative terminal and the black to the conclusion with the AU logo. Since the threshold voltage is measured, which for a silicon diode is 400-1000 mV.

Useful advice!To 100% verify serviceability of the diode bridge inspection is the reverse inclusion. The black lead is connected to the negative terminal, and red - to the positive. On the meter display should show a value of "1". This suggests that the P-N transition large resistance is present, and the diode current is not passed.

In this way, we checked all the diodes of the bridge. If during continuity diodes displayed on the display multimeter zero resistance or the device will emit a signal, this indicates pierced element inside the diode bridge. When checking also display a "1" in the reverse switch on the screen. However, if and when the forward and reverse switch on the instrument display will show the unit, this indicates an open, when the diode is not conducting.

Before using the meter, it is necessary to study in detail the instructions in "How to use a multimeter", where all the possible manipulation of the tester described in detail. Strictly following the guidelines, you can perform all the necessary measurements that do not withdraw the device from the system and make it work safe.

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