How to change the batteries in the indicator screwdriver

Battery-operated indicator screwdriver

This is a more advanced tool that has a bright light bulb. It is easy to work with, to check for current, you just need to touch the wire with the tip, without touching the metal contact on the handle. You can easily use this indicator to check for a broken wire. To do this, squeeze the metal pin and use the stinger to touch the dead wire. With your other hand, touch the other end of this wire. In case of a break, the indicator will not show anything, but if the wire is whole, the LED will light up.

change, batteries, indicator, screwdriver

Battery-operated indicator screwdrivers

Any kind of wire can be checked. For example, to test an extension cord, you unplug it and make a metal jumper out of a piece of bare wire. Insert the jumper into one of the outlets on the extension cord to short-circuit its wires. The extension cord plug should be taken by hand and held with the fingers on one contact, and the second contact should be touched with a screwdriver with the metal top clamped. If the wire is intact, the screwdriver indicator light will be on.

Indicator screwdriver beeps and lights 2

This model can be used as an indicator of live wiring. That is, the device allows you to identify live, insulated wires that are on the surface of the wall or embedded shallowly in the wall. To find the wire, grasp the tip of the screwdriver with your hand and guide the handle along the wire or wall. The light will light up to indicate the presence of current in the wire or the presence of energized wires in the wall. This function is very useful in the case of repairs when it is necessary to penetrate the wall and the location of hidden wiring is unknown.

How to check the functionality of a differential circuit breaker

RCD. built into the automatic residual current device is designed to save human life. It’s important to be sure that the device works and that it works when you need it.

To simulate an emergency situation, there are various methods of testing the device:

Each automatic gas differential is equipped with a test button “Test”. The easiest and safest way, which does not require additional skills. To implement a circuit with a button, the manufacturer has installed in the device a resistor of the correct rating. When it is pressed, current flows through the resistor simulating a leakage and the automatic differential switches off the mains. The disadvantage of the method is that it is impossible to control the device during the purchase, the “Test” button works only when the voltage is connected. Many experts point out another significant disadvantage of buying a non-original product, the test button is always triggered, regardless of the performance of the automatic differential. In some cases, even in the absence of voltage.

Testing the differential circuit breaker with a battery. A very useful method during the purchase of the device, which does not require connection to the 220 V mains. To realize this you need to connect two wires, one for the input and one for the output, to a de-energized residual current device. Connect the opposite ends of the cable to the plus and minus 1.5 V batteries. When connecting the battery, the circuit breaker opens the circuit. Class “A” devices, always work. Fuse breakers “AC”, require a certain polarity and in case of failure, it is necessary to interchange the battery wires.

With a simple circuit of a light bulb and a resistor. Requires some skill and will not suit everyone, but with its help, the device is checked on each outlet in the circuit of a residual current circuit breaker. To begin with, you need to calculate the resistor using the formula R=U/I, where R. resistance rating, U. The voltage in the network, I. Current in the circuit (e.g. device with a leakage trip of 30mA). We have R = 220 V / 0.030 A = 7.33 kΩ. Then connect the resistor and the light bulb in series. Put one end of the wire on the phase and the other end. To ground or zero. A working device should work.

The most accurate method of testing leakage current. using a multimeter. To the previous circuit, a dimmer and a multimeter with milliammeter function should be added to the circuit breaker. Increasing the power smoothly, with the help of the regulator, the meter will display the real values of current in the circuit. When a differential circuit breaker has tripped, the multimeter will show accurate readings of the device’s tripping.

How to use the indicator screwdriver tester

About how to use a screwdriver tester, not all people know, although it is a fairly simple tool that has a very broad functionality and can help in a variety of situations: from installing electrical devices in the switchboard to check the work of conventional outlets.

How to use a tester screwdriver correctly?

First, let’s tell you what kind of indicator screwdrivers there are and what the advantage of each type is. Today it is common to use the following types of indicators:

  • An ordinary probe without a battery and a light bulb. The principle of operation of such a model is quite simple: the current hits the sting, then goes to the resistor, is limited and goes to the indicator light. Pay attention to the fact that the top of the screwdriver is a metal stud, which is the second contact. To check the electrical wiring, a finger man must be on this nickle, otherwise the probe will not work (the circuit will not be closed). The advantage of this model is the low cost and the simplest design. The second advantage is at once the main disadvantage. the indicator screwdriver without a battery has a minimal set of functions, which only allows you to find phase and zero, or check the voltage in the socket. You will not be able to find a break in the neutral wire or phase wire with this tool, because.к. Display threshold is quite high. over 60 volts.
  • Battery indicator. A more advanced version of the probe. with power supply and LED. They don’t look much different from the previous model, but if you look inside you can see the bipolar transistor shown in the diagram below. Battery operated indicator screwdriver can be used for the following: phase/ground, plus and minus (in cars), open circuit and location of electrical wiring under plaster. The last feature allows you to find the wire in the wall in a non-contact way, but the error can be high. The advantage of a battery-operated screwdriver is that, compared to a normal tester, it can even be used to test continuity of wires and fuses, making it multifunctional. The battery powered indicator is best for your home use.
  • Electronic indicator screwdriver with LCD display. Such model is multifunctional and besides it includes all functions described above, it can additionally determine the voltage value (in the range from 12 to 220 V). In addition, the electronic indicator can be used to detect hidden wiring. In essence, the electronic tester is a mini version of a multimeter. Due to the fact that its cost is 3-4 times higher than conventional indicators, and at the same time, the functions are not as many as a full-fledged tester, professional electricians use it very rarely. Home electricians-self-taught this option is also not recommended to use, because.к. The overpayment will be considerable, and all the functions will not be used anyway.

So, we’ve considered the most popular types of indicator screwdrivers. Here’s how to use each model for the most common situations that can happen at home.

Without load, only output voltage of battery can be measured. In electrical engineering, this parameter is called EMF. electromotive force.

Unlike a rechargeable battery, in disposable power supplies not only the voltage drops when discharged, but also the output current, so testing without a load must be accompanied by other kinds of measurements.

Before you measure a battery 1.5 v multimeter, it is necessary to disconnect it or take it out of the device case, then measure the potential at the contact pads of the cell and according to the results of measurements it is possible to conclude about the serviceability of the cell:

  • more than 1.35 V. the battery is undamaged and suitable for further use
  • 1,2-1,35 В. the cell shows signs of discharge, but it is allowed to be installed in equipment with low current consumption;
  • less than 1.2 V. the battery should be replaced with a new one.

Careful! 1AC-D non-contact voltage indicator

This tool was commissioned specifically to warn customers and users about the peculiarities of working with it. I myself do not use such devices for their intended purpose and I would not advise you to do it either. The device does not require a power switch and I do not use such devices for direct purposes, I do not use them directly and do not advise you to do so. The indicator tip is pretty thin and can easily be broken. There is a warning sign on the housing: “Warning: Read the manual, check before you use” But there was no instruction in the kit and it is unclear how to check the device. There is a LED backlight by pressing the button without locking During actuation, it beeps loudly intermittently and blinks with a red LED under the white plastic tip. It is powered by two AAA batteries There is no power switch and it doesn’t need one.к. in standby mode, the device consumes only 0.3 mA, which is much less than the self-discharge battery current.

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Naturally, the device was disassembled The sensor itself is an ordinary resistor with long pins. Instead of a resistor, any piece of wire may as well work. Apparently the resistor was easier to solder. A simple circuit based on the Schmidt triggers in the 74HC14D lib.chipdip.ru/223/DOC000223080.pdf The sensitivity is determined by the 200 MΩ resistor rating (rare for SMD), higher rating means higher sensitivity. The light-emitting diode is switched on by the button directly and with fresh alkaline batteries it overloads. I just added a 9,1 ohm resistor in the gap of the circuit to prevent the LED from burning out. The device is a simple indicator of alternating electromagnetic field, reacting only to the electrical component. The sensing distance to a live wire is 1-2cm. Static, high frequency and magnetic fields of the device does not work. As a detector of hidden wiring device does not work. too little detection distance and any conductive surfaces block the passage of the wire.

So, why do I strongly advise against using such devices as voltage indicators? They do NOT guarantee the absence of dangerous voltage and therefore can be misleading. The device does not react to the voltage itself, but to the alternating field created by it. But that’s the problem, it’s not always the live wire that creates this very field. For example, if a wire is placed near grounded metal surface or just lying on the ground. the field will be well shielded and the device will not show anything. Not to be unsubstantiated. I show this feature on the video, in this case the hand even on the back side of the wire was a screen

One more peculiarity. if the housing of the device and especially its tip is wet or dirty, the sensitivity is sharply reduced.

If really wanted to buy the simplest detector, then for the same money is better to take such a universal with a switch (made under different brands) or just use an indicator screwdriver with a neon light. It is even better and more correct to check the voltage with a multimeter 🙂

Conclusion: to take and especially to use the device as a voltage indicator strongly recommend not.

TEK 6885-48NS voltage tester indicator screwdriver

Register online and get special from the first purchase!

This product is shipped on prepayment.

Scope of application wiring
Country of Origin China
Type of tester analog
Type tester
Measurement method non-contact
Number of probes single pole
Gross weight 0.06 kg
Screwdriver tester yes

Screwdriver voltage tester 6885-48NS sound

The price on the site is only valid when ordering through the online store and may differ from the price in stores

Dmitriy suggested correctly (10.07.17г).When searching for hidden wiring the right hand holds the device with the pressed metal contact on it.Medium position.Moving along the wall. When the sound starts to be interrupted, then. We put the left palm against the location of the wire to the wall.,where we are going to poke the probe.In a place where there is a break in the wall, the sound will disappear.I’m pretty sure I found.

Simple and very necessary gizmo, it is impossible without it at the electric shabachi.

Sometimes it lies, sometimes it does not, use as a first line to assess the situation, then check with something normal. Auxiliary rattle.

In use, the screwdriver for me is comfortable enough and for me that is the most important.

Very useful thing in the household, and costs pennies. Screwdriver quality. It works in three modes. Low, medium and high sensitivity levels. Indication of not only light, but also sound is.

Bought it looks phoned everywhere and on everything. But after reading the instructions explain how to use. The main problem is the zero pickup when there is no phase (there is a squeak but no phase). How to get rid of such a tip !put it in the middle mode (low sensitivity). !always hold a finger on the metal contact with a non-contact and always put the cap on. !With the left hand we touch the insulated wire in the place where we put the device with the right hand and voila it silences without voltage and vice versa!

The device performs its functions on five. It is not designed for accurate determination of wiring in the wall for that there are other devices are much more expensive. It is the same as a screwdriver will show where the phase and that’s all

I don’t understand how it works or what it reacts to. I am completely shocked, crap

Non-contact search mode wiring does not work. The contact mode works a solid 4: a) by touching the side contact with the hand and touching the probe to the wire shows phase (lit) or zero (unlit); b) by touching the side contact with the hand, touching the probe to the dead wire and touching the other hand to the second dead wire shows circuit continuity (lit) or breakage (unlit); c) by touching the side contact with the hand and touching the probe to the metal housing of the turned on instrument shows ground (unlit) or no ground (lit) d) touching the side contact with one hand, touching the battery/battery pole with the other hand and touching the probe of the other pole with the probe shows “plus” (lit up) or “minus” (not lit up); e) touching the side contact with one hand, touching the battery “plus” with the other hand and touching the probe “minus” shows that the battery is high (not lit up) or low (weakly lit up). The instructions describe many other applications of the device, but I have not tried them and can not confirm them.

Review: Novotek MS-18 “ROSEL” multifunctional indicator screwdriver. A battery-operated screwdriver with 5.I received the product with the following functions.

Hello friends and readers, I am again with a review of the received product. I received a multifunctional indicator screwdriver from the brand SafeLine. As far as I know, it is a soviet-style screwdriver, which can be used to tighten screws and self-tapping screws, if you have no ordinary slotted screwdriver handy. But first things first.

The packaging is standard tight, in the style of the color scheme.

Made in China, under the order and supervision of the company “Rosel”. Russia St. Petersburg. Service life 7 years.

Website of the company where you can find more detailed information.

Inside the screwdriver and instruction manual in Russian.

There is a metal plate on the end of the handle, but you don’t always have to touch it. Also by unscrewing it, the batteries can be changed.

You check if the screwdriver works by touching both ends of it at the same time. the tip and the button on the handle.

As a result the LED should light up. I advise doing this test each time before using the indicator screwdriver.

After all, if the batteries are dead, the LED simply will not light up, and the consequence of touching the “phase” can happen an electric shock.

Thin stylus with reinforced plastic housing.

Indicator lamp, with two batteries.

Did not change the power supply during operation, but disassembled and made sure that everything is easy and simple and then assembled the same way.

Second way AC voltage sensing in non-contact mode up to 600V. Hold the screwdriver to the power lead, to the socket, to the switch. This is how you can find hidden wiring in an apartment, for example if you need to drill a hole and are afraid to get into the electrical wiring. To my senses this method is not relevant, since the whole wall phoned, even a nail or screw in the wall. The manufacturer writes that for higher sensitivity should be closed hands stylus screwdriver.

I have not helped, phoned almost the entire wall, I think the thing is that the wire is not too deep in the wall and gives off an electric wave. But even where it is supposed to be a wire, the screwdriver shows its presence by lighting up the LED.

3 way to locate the break in the cable. Also a non-contact method. To locate the break in the cable, close the stylus of the screwdriver with your hand and with your free hand take the wire and move the nickel along the wire. At the place where the LED goes out, the wire is broken.

No breaks, works in normal mode. The second attempt to check the breakage was a USB wire from the phone, stopped charging. I tested the wire, I did not find a breakage, I assume that the problem is in the connector itself, the housemates and I myself do not always carefully plug the charger into the connector.

4 way to check the continuity of the circuit. The contact method.

Мало кто знает эти СЕКРЕТЫ с ИНДИКАТОРНОЙ ОТВЕРТКОЙ! ЭЛЕКТРИКИ не хотят об этом рассказывать !

The device must be disconnected from the mains. But at the same time the operating mode is on, tested on a hairdryer. Short the stub, and touch the probe to one of the terminals on your plug. And with your free hand close the other terminal of the circuit, the LED will turn on, so there is no break in the circuit.

And the fifth and final way to determine the polarity of the battery or accumulator. 1.5 to 36 VDC. I think it is easier to show you a picture of how this method works than to write. I am reminded of when we were computer science to write in detail how to open a page, how to delete the page in steps, such it was tedious work, especially for people like me who did not have their own computer.

If the polarity is correct and the terminal is positive, the LED lights brighter. If the terminal is negative, it does not shine as bright.

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This screwdriver can be used in professional activities and for household needs as a voltage indicator, if for example there is no multimeter.

Just a screwdriver can ring the switch (not to put it upside down). And also found information that the batteries can be recharged by simply sticking the screwdriver sting into an outlet where the phase, and hold for 20 seconds.

I liked it all, but that is doubtful, but I think over time I figure it out and master this wonder multifunction screwdriver. I have always been with electricity only on you, and who can get their bare hands on the wires without turning off the power, it is certainly not about me and for me it is important to make sure that I will not expose your body and body danger. With this screwdriver I am sure of his safety, before dealing with electricity, I use it to make sure that in the circuit, wire and socket no electricity.

Low voltage pointer

May 27th, 2012 Filed under: Electrical Safety

Dear visitors and regular readers, welcome to the site Electrician’s Notes.

Continue learning about electrical safety, and in particular about the protective equipment used during the operation and repair of electrical installations.

Today’s article will focus on low voltage indicators.

Indicators of low voltage (UNN) are used to test the presence or absence of voltage in electrical installations up to 1000 (V) on those live parts, where work will be carried out. They are also used to check if phases match, i.e.е. phasing of low voltage electrical equipment.

Indicators of low voltage, or as they are also called voltage pointers to 1000 (V) are of 2 types:

Therefore, the application will depend on what kind of indicator you use.

There are many varieties of low voltage indicators from different manufacturers.

I will not dwell on each type, but talk only about the most common and reliable indicators of low voltage I personally use.

For example, a single pole low voltage indicator in the form of a screwdriver is used in electrical installations with voltages from 100 (V) to 500 (V) and frequencies of 50 (Hz) only. Operating principle of this indicator is based on capacitive current flow.

Two-pole low voltage indicator (UNN-10K) has a wider range of application. It may be used in electric installations, both AC voltage from 110 (V) to 500 (V) and frequency 50 (Hz), and DC voltage from 110 (V) to 500 (V).

Its principle of action is based on glow of gas-discharging lamp with active current flowing through it.

Two-pole low voltage indicator (PIN-90M) is used. Its principle of operation and design is similar to UNN-10K.

The only difference is the voltage range to be monitored. Its working voltage is in the range of 50 (V) up to 1000 (V).

Quite recently I got acquainted with a voltage indicator Contact-55EM. Please follow this link and read the instruction on how to use it.

Warning. It is NOT permitted to check that live parts are de-energized by means of test lamps.

What a two-pole low voltage indicator consists of?

The two-pole low voltage indicator consists of 2 housings. The housings are made of insulating materials and contain elements that respond to detection of voltage in the tested circuit by means of sound or light indicators.

The two enclosures are connected by a flexible wire of at least 1 meter in length.

The dimensions of housings of two-pole voltage indicator are not regulated.

Each housing of the two-pole voltage indicator is equipped with a probe-tip, the length of the non-insulated part of which must not exceed 0.7 (cm).

What a single pole low voltage indicator consists of?

A single pole voltage indicator consists, in contrast to a double pole, of one housing. Similarly, the housing must be made of materials with electrical insulation properties.

The enclosure contains the following elements:

Testing a low voltage indicator

The following electrical tests should be periodically performed on low voltage directional sounders in service:

  • testing of insulation of handles and wires
  • overvoltage test
  • indication voltage determination
  • Measurement of current flowing through the charging device at the highest operating voltage

Insulation test of handles and wires of low voltage indicators

Isolation test of the handles and wires of low voltage indicators is performed once a year according to the following schematic diagram:

Both bodies (handles) of a two-pole low voltage indicator shall be wrapped in foil. Connecting wire is lowered into a bath of water, where the water temperature must be within the range of 10 40° C. A distance of 0.8 1.2 (cm) between the water and the bodies of the pointer must be maintained.

The first lead from the test transformer is connected to the electrode leads. The second (grounded) lead should be dropped into a tub of water and connected to the foil.

Similarly the insulation test of the case (handle) of single pole low voltage indicators is carried out. Body is wrapped in foil over the whole length. It is necessary to maintain a distance of 1 (cm) between the foil and the electrode at the end of the pointer. Connect one lead from the tester to the tapered electrode. The other (grounded) lead to the foil.

For the UNV with operating voltage up to 500 (V), the test voltage of 1000 (V) is applied for 1 minute.

For directional indicators with operating voltages up to 1000 (V), the test voltage of 2000 (V) is applied for 1 minute.

Testing of low voltage indicators with overvoltage

To test low voltage voltage indicators with overvoltage, proceed as follows.

The test voltage equal to 1.1 of the highest working voltage of the directional resistor is applied between the electrode-cone of the two-pole indicators, or between the electrode-cone and the end part of the one-pole indicator for 1 minute.

Finding the voltage indication

The voltage from the testing device increases smoothly, at the same time fixing the voltage indication of the voltage indicator (VIN).

Low voltage indicators should have an indication voltage not greater than 50 (V).

Measuring the current flowing through the NTC at the highest operating voltage

Increase voltage from voltage tester smoothly up to the highest operating voltage of 1000 (V), and record the amount of current flowing through the voltage indicator.

Two-pole voltage indicators must not have a current value greater than 10 (mA).

With single pole voltage indicators the current value must not exceed 0,6 (mA).

How to use the voltage indicator?

Before using a low voltage indicator, check that it is in good condition by touching live parts of the installation which are known to be energized. It is also necessary to check that there is a stamp of testing of the NSA.

Checking for the absence of voltage with a pointer low voltage is made on live parts by direct contact. The contact time should be at least 5 seconds.

When using a single-pole low voltage pointer, the use of dielectric gloves is not allowed, t.к. It is necessary to ensure the contact between the electrode on the end part of the housing and a human finger.

P.S. This concludes my article on low voltage pointer. If you have any questions when studying the material of the article, then please ask them in the Комментарии и мнения владельцев page. Do not forget to subscribe to new articles from the site. The news about the release of new articles will come directly to your mailbox.

98 Комментарии и мнения владельцев to Low Voltage Pointer

Dmitry, you write your articles so clearly, that soon I myself will become an expert in this business and will begin to conduct my own work as an electrician. Thank you!

Thank you, Tatiana. This is my main goal and difference from other sites.

Of course, the use of kontrolka, as a means of protection, utter stupidity.But in the work it is necessary.

Especially in relay control is not allowed, right Dmitry?)))

Question for clarification Single pole unn shows potential when checking for zero. When breaking from a single pole VA does not light, who is to blame and what to do?

How do you expect a single pole UUT to show zero?? Alexei, ask the question correctly.

The UNH neon bulb lights up when in contact with zero (although this can not be/should not be).

Dmitriy you forgot in the article about such pointers as MS-18 in them just can not finger to the contact.

Personally, in practice, did not have to apply these.

What is this nonsense??Hire an electrical lab to test the indicator light ??

Yes, Maxim. Do you know the penalties, especially officials, for the use of protective equipment that has not passed the test?

Sometimes there is no voltage (phase) and indicator screwdriver is lit.Why?

Indicator screwdriver is susceptible to pickups. That’s why it’s better to use a two-pole voltage indicator.

Wouldn’t it be easier then to use a multimeter? And it is safe and everything is clear, without all the interference!

Not everyone has the opportunity to buy a multimeter, and not everyone knows how to use it. By the way, this is what my last articles are written about. I personally, on the contrary, I think that the two-pole UHN simple and reliable.

Tell me, but is it true that with UHN can determine the presence of wiring in the wall? Or what is better to do it?

Anton, I can’t give you an unambiguous answer. Yes and no. There are particularly sensitive single-pole indicators, which light the wiring. But the error of detection will be so great that it is not worth it. To accurately determine the path of electrical wiring, there are special devices and appliances on sale. I tell you a secret that I used to shine the wiring with a thermal imaging camera, but then I had to give the cable an overload.

Can you tell me what these special devices are called?

On sale there is a wide variety. For example, more or less reliable, widespread and affordable is the hidden wiring alarm Woodpecker.

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Our workplace banned the use of a single-pole low voltage indicator in the form of a screwdriver. т.к. an electrician checking the presence of a phase on the breaker closed on the body, automatic type AE 1031 16A, there were three machines next to each went to a phase caused a short circuit an electrician alive, unharmed, but has changed his profession

Electrical safety must be respected always and everywhere. We also had a case, but a long time ago. Before installing a portable grounding on the KTPN 10/0,4 (kV) operating personnel (on duty) in the person of a woman began to check the lack of voltage on the low side of the transformer 0,4 (kV) with a two-pole NN, and they accidentally climbed on the high side 10 (kV). There is nothing left of the two-pole indicator. At least the oven itself is still alive.

And how to use the UHN to check for phase matching?

Sergei, do you mean how to phase?

Thank you for answering.The oven turns out to be in working order, my friends told me how to use it.All that should work in the oven, works with a timer.In the owner’s manual, it’s vaguely spelled out.

I strongly disagree with the last picture, it is not the first time I encounter this error. The last 2 pictures show the so called active indicator, it has a “dialling mode”. Touching the end electrode with your finger you just use it in the “testing mode” and it shows you the neutral conductor in the socket.е. It’s testing through your finger on the ground and from the ground to the neutral conductor. You do not need to touch the electrode with your finger to check the phase. In general, the indicator is more of a household, strongly reacts to the tip, and when you put it in the el. The cabinet it is on all the time. Reacts to hidden wiring under plaster.

Without a two-pole indicator in the industry, as without hands)). Especially in the panel or switchgear 0.4. For household, IMHO, if only to seek zero or phase with respect to zero. And about the pointer voltage, too often the tip gives))), always check the tester)).

I do not understand how the single pole pointer current? After all, in order for current to flow in the device need two contacts of the socket short circuit zero and phase.

Answer:09.08.2014 at 11:03 am What kind of low voltage indicator do you mean?? You can specify. There is a large variety of them and each is set up differently, but the principle is the same for all. Let’s take the usual Voltage indicator (tester screwdriver 304), 100-500V, 175mm how it is built: the screwdriver rod itself is inserted in the body where you touch the exposed areas, to the metal rod attached set resistance with a miniature bulb, the bulb has an electrical connection with a metal contact in the form of a button or an end screw on the handle screwdriver. This entire structure forms an electrical circuit, which lacks the current of the two elements of the power supply and low-potential points. When you take a screwdriver to measure the voltage you touch the pins of the power source with the metal rod of the screwdriver and your finger clamp the screwdriver end screw, resulting in a complete chain, where the power source and a point with a low potential as this point is your body (your body and is zero).

So how can you make phasing with the UHN?

Igor, this is a topic for a separate article. And to cut a long story short, with homonymous phases the pointer will not show anything, and with opposite phases it will show line voltage, t.е. the voltage indicator light comes on.

Disassembled modern PIN-90M previously I thought that it only had a neon and added resistance. And now I saw that there is a diode in parallel to the neon, and a capacitor is included in series with them It turns out that if there is a capacitor, the indicator shows only AC well it’s ok. What is the diode for??

Is it possible with a two-pole voltage indicator (DNV) to determine where the phase and zero in the socket?

why the 2-pole voltage indicator has a flexible conductor length of at least 1 m please tell me?

why 2-pole voltage indicator length of flexible conductor is not less than 1 m please tell me?

The length is determined by the convenience of use. The busbars can be placed far apart in the switchgear.

Is it possible to use a two-pole voltage indicator (UNV) to determine where the phase and the zero of an outlet are?

To identify a phase conductor, you must touch one pole of the indicator (with an indicator): if there is a phase, the indicator will glow half-light; if there is zero, the indicator will not glow

Please tell me why the off.electricity in the house, when checking the current in the socket lights up? In another house, unscrewed the plugs and checked the indicator does not light.

Valentin, maybe your input fuse or breaker does not disconnect the phase, as it should, but the zero, that’s why the phase is lit in the socket.

I changed the socket and the light is on when it is off.switch.but it didn’t electrocute. I need to swap the wires on the meter.so the circuit breaker would disconnect the phase?

Good afternoon! Recently I came across a new type of single pole indicator (indicator screwdriver). The thing is that this screwdriver contained a battery. When I tried the phase with it, the indicator light came on even without touching my finger. And when I touched it, it would light up even more. At the same time, the indicator could light up in a situation where there was no current at all, it was enough to touch the back electrode with a finger. To tell you the truth, a person accustomed to the usual indicator, it is confusing.Please explain the meaning of this device and whether it is functionally worse/better than a conventional batteryless screwdriver.

Answer: Alexander: 29.09.2015 at 16:12 Alexander, when you need to test the conductive cores for voltage with this indicator I take it from the description it is your OP-1 do not in any case do not touch the metal part (button) of the screwdriver. It serves to form a closed circuit through your body. This is necessary when testing (vertebrae) a circuit such as a wire or when checking the filament continuity on an incandescent light bulb. Also this indicator can search under the overlaps of the wiring, and to be precise, it reacts to the electromagnetic field, and as you know the conductor with the current always has an electromagnetic field around itself. In this way you can detect in the radiation area of electromagnetic fields cable or wire under the ceiling. To do this, simply take your hand to the slot in the screwdriver and bring it to the intended place of search and look carefully at the light indication of your screwdriver, the closer you awake to the source of radiation the brighter the indicator lamp on your screwdriver will shine. In terms of functionality, it is of course better, but there is a BUT without batteries does not work, so you need to monitor the status of the batteries, if sat down the screwdriver will stop its work is particularly not convenient when it happens during the work, so I always keep 2 screwdriver probe, one similar to yours only with LCD display which has a voltage reading during testing, the second is a classic indicator.

Answer:Konstantin:29.09.2015 at 20:44 Thanks for the reply! But the point is exactly that I touched the button when I was checking the phase in the outlet. Like I said, the light bulb just started burning harder, but it didn’t electrocute me.

Answer: Alexander 30.09.2015 at 18:53 You do not understand me, you will not get an electric shock as the circuit is closed through the resistance and polarity of the batteries, and not the AC mains where you make the test. Once again, if you need to perform a voltage test of the conductive cores with this indicator do not touch the metal part (the button) of the screwdriver. Touching that button makes the indicator test the continuity of the circuit, not check the voltage.

Such a battery-operated probe is the functional counterpart to the one with the traditional neon, but it is active and allows you to check for circuit continuity, incandescent bulbs, etc., in addition to determining line/phase conductor/bus, etc.п. but not energized! Simply take the lamp by the base in your hand and touch the center with the probe. contact. Similarly, the fuse and other.

Dear Admin, please advise how to determine where the phase where the zero in the socket or in the conductors with UNNU 40-1000 inserted into the socket swapping places, both LEDs are lit in both cases

Response DMITRY: 01.10.2015 at 2:56 pm A two-pole voltage indicator to determine the phase, you must insert one end of the indicator into the socket and touch the other end with your finger (hand). In the case of lighting control lamp phase. In the absence of zero.

I tried one end into the socket the other to the finger. the diodes (there are two) do not light in any of the holes in the socket, and I put two ends of the burn both.

DIMITRIY 02.10.2015 at 10:22 am Dmitry, unfortunately I have never used a 2-pole, but it turns out that then you need to throw the 2nd end of the probe to a separate grounded conductor (e.g. a wire or a wire with a different conductor).п. battery).

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