As prozvanivat multimeter or tester Wire

Often found on the network information that may allegedly tester to measure the resistance of the copper wire. It fails, if the equipment is sufficiently sensitive, but typically will not be able to carry out such an operation. Resistance kilometer core may be, for example, 10 ohms. How much will to specifically taken the interval? As a rule, the loss of focus on a poorly made electrical connections, was born another question - whether prozvanivat multimeter or tester cables. We believe that the screwdriver-light is cheaper, and is suitable for such operations better.

How to test the integrity of the wiring

It is believed that we needed a tester to check that the wiring. Look at the photo: unassembled presented Activity screwdriver indicator. She prozvanivatsya wire without any difficulty. The images show:

1. Plastic transparent case with integrated tightly steel probe.
2. Metal clip for attaching to master your pocket.
3. Contact button in the form of threaded caps.
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4. Two batteries of 1.5 V.
5. The electrical part of the n-p-n transistor and a small red LED. The spring serves as point of attachment for the positive potential, here mounted LED anode.
6. A high resistance of solid graphite shows a high amperage. Limits the current in the circuit.
7. The plate is attached to the Screwdriver indicator on the time of sale, as a result of the product is convenient to store in the house.

We draw a diagram to illustrate the products work. Let's see: the base n-p-n transistor join the probe through a high resistance. Emitter closely leaning against the negative pole (button batteries), and the collector goes to the cathode of the red LED. When we undertake a hand screwdriver for button indicator and the second of the probe, the weak We serve a positive impetus to the base of the transistor. As a result, p-n junction of the collector-emitter voltage is opened and the current flows, lights a flame signal. It's simple as ABC.

Please note, no longer required for the phase display pitch in the contact finger button. Otherwise display will go wrong. Instead, the probe is simply touches the phase conductor is charged a small amount of power from the AC circuit (due to transients), resulting in LED lights. Note that the device does not detect a low constant potential. In this case, there are no conditions for the establishment of transitional processes with change of charge, and there are no gate on-pulse.

Plus Product: Screwdriver is an indicator of the presence of the ground. You need to touch the contact button finger. In this case, a person informs the body screwdriver indicator potential that is different from the existing underground. As a result, due to the resulting difference transistor opens, the red LED lights. It is rather reminiscent of the flickering, since the levels of terrestrial and atmospheric building does not have a large difference. But if a screwdriver indicator is made with properly, it will be possible to find neutral.

But do not hurry to rejoice! If you turn off the light and measure the reading phase, quickly realize that any long lived makes flame burning. This is not mysticism. Cable core becomes a wonderful antenna for electromagnetic waves, the energy is enough to make a screwdriver indicator flashing. It responds directly to the alternating current, as already mentioned. However, the expected elevated EMF to open the base of n-p-n transistor. It turns out a screwdriver indicator is not considered to be the perfect tool to assess the quality of the ground. But to ring wiring is easy and simple, with the tool much easier to any tester.

Consider the features of the device.

• The easiest way, when testing an electrical device. Set on knees and in seconds insulation resistance check. To do this, one finger touches mine, the second - the contact button. Probe looking for a place on the body, where the metal is visible. If the flame is lit, broken insulation, repair begins with a specific location.
• It is easy to ring the power cord. If you are experiencing the lighting device, pull out the plug from the socket, unscrew the lamp and suom finger in the socket. Permissible touch simultaneously both contacts. Take turns on the plug of the probe pins. Finger on the contact button. When the closed switch to call the two strands at the open - but only one.
• When you need to determine the integrity of the wiring chandeliers, we act differently. Firstly, removed buttons from the switch. Then we find the phase. Cut in the light. If the phase has disappeared, switch is wrong, but the wiring layout is done properly, and the contactor is in order. For further operations, it is recommended to cut down the light. Then taken wire of any section to the length enough to shield. According to the rules on the cartridge factory earth terminal is obliged to call the housing. In operation, be careful inside the electrical panel bared wires are energized (the difference between the phases of 380 V). If incorrect wiring land enters the switch, and this branch has to call on the body. Phase recommend checking with a screwdriver indicator. Call live wires deadly. Turn on the lights, grab a screwdriver indicator and check that the phase in the right place there (the second terminal of the cartridge, or one of the switch contacts). It remains to ring wires between the switch and a chandelier. Need to unscrew the light bulb, turn the light (illumination, rather than traffic jams), and then to evaluate the presence of phase on the cartridge. Further we are acting, on the basis of the data obtained. If the phase is present, the set bulb filament into the cartridge, the duty voltage to appear on the switch. It speaks about the integrity of the wires. If the original phase cartridge was not (the right type of wiring harness) are invited to unscrew the light bulb turn on the light (illumination). In this case, the holder screwdriver indicator captures voltage appearance. Means carried purposes.

See how easy? By means of a screwdriver indicator manages check any chain and multimeter tester and reserved for the case when it is required to measure the voltage, current or resistance. We have already talked earlier as using a screwdriver indicator checked by low-power diodes and transistors. This is a truly universal tool. And most importantly - it is necessary (for Fall 2015) 30 rubles. Equal to a loaf of bread. In addition, a screwdriver indicator helps you find a wire in the wall!

What to do if you want to ring wire tester

If you can not buy a screwdriver indicator, work will have a multimeter. The algorithm is simple for those who bother to read the text under the previous subheading. For operation it is strongly recommended to buy headlamp flashlight. This will facilitate the execution of operations. Let's say, it took a multimeter to ring wires in the wall, reaching to the chandelier:

1. At first, we find a place summing up phase. Required to wind up the switch, but it is often the other way around.
2. The first thing unscrew the bulb. This will provide an open circuit in the region of the cartridge.
3. We assess the presence of the top phase. Note that the switch is cut down, and plug included. In this case, it is not dangerous to short-circuit the contacts.
4. Expose the AC voltage with the limit of the scale, clearly greater than the mains voltage of 230 V. Generally, the upper limit is 700 - 750 V. Leans probes to the connection terminals of the cartridge... and see on the display is zero. That is correct, because the switch shall be melted. Provided against the danger of getting a short circuit. Now you need to make sure that the test leads are not short-circuit the contacts of the cartridge. Please note, metal thread E27 is usually isolated from the phase and neutral conductor, not serious. The main thing - do not short-circuit the terminals.
5. If all goes well, ask the assistant to press a switch. Complicated? You have said that the screwdriver indicator fit much better. Now, the phase is fixed when the light The headlight lantern. Screwdriver indicator light is not needed. In most cases, lack of natural light level, even for dark places. And then, to wield a screwdriver indicator requires only one hand, and for the little tester and two: a pair of probes and the body, there are three. The conclusions are clear. So, if the terminals 220, further proring wires multimeter meaningless voltage available, it's time to get down down.

Plus multimeter: possible with a single operation to ring wiring. But the vote, as the action is dangerous and difficult. Screwdriver indicator is made in several steps, with safer. Now try to ping tester wire any device. Be warned, it is impossible to work under stress. In addition: power supply in separate circuits remain off after the potential (charge capacity), there is a chance to burn the device. Screwdriver indicator, as can be seen from the photo, is suitable for work with voltages up to 500 V.

Do not rush it and climb inside the power supply voltage can be more than 600! The power cord is too unsafe to ring. It is believed to use the arrester in both cases. Suitable light bulb screwed into the cartridge, to which the two the bare wire. Standards expressly prohibit the use of such delights. You do so at your own risk. In selected guidelines recommended in such cases resistor of 1 k to the power dissipation is 5 - 10 watts.

The study of Russian Internet shows that most artists do not pay attention to restrictions due to the obvious convenience of the lamp - it immediately shows the presence of the charge and removes it at the same time. With such a chuck masters often seek phase, which is prohibited by law. So, take the appliance, for example, iron:

1. It is not always required to disassemble the cabinet. It is believed to put the temperature control to the maximum and try to measure the resistance.
2. If the value is less than infinity, the wiring is intact, and the fault is assumed to look for in a bimetallic relay.
3. It happens that a fault floating: disappears and reappears. Then you have simply changed the entire cord defect place will be very much to warm, it looks inevitable cause of the fire.

The power supply is usually ping high-voltage wires is not difficult, but the difficulties lie somewhere in the circuit. Strongly recommended download drawing electric part from the Internet, and then explore each element separately. We have already raised the subject before.

So, it is clear to readers that measure the resistance of the wiring is difficult. Small portions of the cable tester absorbs internal error. When measuring such resistance is permissible to use indirect methods. For example, to make the resistive divider and based on the measured voltage portion attempt to calculate its resistance. In this case, the accuracy of the expected order of magnitude higher.