Screwdriver, which can be thrust into the socket // Screwdriver indicator: device types, purpose

From childhood we are taught nothing poking holes in the socket. And absolutely correct, as so reckless act threatens to produce a painful, and in some cases even fatal discharge of electrical current. But there is a special device that is designed for this use. This indicator screwdriver, which will be discussed further.

Photo indicator screwdriver inserted into the socket

Design and Function

Why should conquer childhood and well-founded fears, and insert into the socket a product very similar to a conventional screwdriver? In order to check its condition and to consider further action plan: to proceed to repair their own hands, or call a qualified electrician.

Repair outlets, have not been tested indicator screwdriver

You can ask for this occasion a fair question: "What if sharahnet?" No, not sharahnet.

The thing in particular its device, which looks like this:

The device is a classic indicator screwdriver

• Sting a contact portion device. It should be inserted into the socket, or directly against the bared wires;
• Resistor It has a very high resistance, due to which you are entering dangerous sting in the electric current;
• Neon lamp - is a direct indicator itself which in case of voltage presence in the surveyed object begins to glow;
• Spring improves the contact with the contact plate;
• The contact plate. And here is the interesting part: in contact with your finger. That is, in fact, should be added to the diagram of the device one more element: you!

It human body closes the circuit when the application of the instrument

Thus, the principle of the indicator screwdriver is fairly simple:

• Energized with current element passes through the probe was set over;
• Then the "bumps" in the resistor, the resistance of which is greater than 0.5 milliohms. such barrier weakens the strength of the current to a safe level for the human body;
• AND lights neon lamp, Thereby demonstrating the existence and serviceability of phase wiring.

species

What are indicator screwdriver? There are three main types:

classic

Simple partial indicator screwdriver

It is this tester, we have already mentioned and reviewed with you.

Its benefits can be written:

1. Practicality and durability. This simple device can be stored for years among your tools without requiring any attention, and help out in time of need testing of electrical circuits;
2. Low price. The simplicity of the device clearly shows that large resources to create such a device is not required, therefore, expensive and then take nowhere;
3. Elementary instruction manual. They stuck a thorn in the socket and placed a finger on the contact plate. What could be simpler? Lit bulb - phase is not lit - zero or breakage.

But in any case, do not touch the metal part of the hand immersed in the probe outlet. It is fraught with a shock.

But there are also disadvantages:

1. High threshold voltage perceived. The tool works exactly only in the presence of a network of sixty volts or more;
2. Having only contact the test method.

with LED

Screwdriver on batteries and with LED

External data devices are no different from the above discussed products.

But but inside they are supplemented by a battery and a bipolar transistor:

Scheme screwdriver display device with LED and self-powered

A simple way to distinguish between independent sample from the usual, and check if it works - it is to lean the finger of one hand to the contact plate, and finger the other - to the sting. The lamp shall be lighted.

Top model with LED and battery, and bottom - a classic

Touch the contact plate in this case it is not necessary for testing sockets.

In addition, it may be noted more number of positive aspects:

1. Possibility of using contactless method for checking flow of the electric current in the wiring. It's enough to bring the back of the screwdriver against the wire insulation;

Show how to check the presence of voltage in the power element in a contactless manner

1. Expansion of the field of application of the device:

• Now you can check out a piece of wire for an open, simply attach it to the bared ends of the probe and the contact plate, respectively;
• Test lamp base by touching it to sting;

Demonstration of how to use a screwdriver indicator for testing base

• Learn about the contact of electric current on the body of metal equipment. In this case also, it is required to touch the operating part;
  In all these cases, LED fun you "podmignot";

Use a screwdriver as a display routine for tightening screws or bolts is strictly prohibited. The material of the probe is simply not designed for such loads.

1. The ability to verify load-bearing elements, a voltage which is even less than 60.

But there are also disadvantages associated with such an upgrade:

1. oversensitive the system plays only a plus, but in the negative. The bulb can illuminate even when there is no object in the test of electric current. Therefore, before using a screwdriver indicator, equipped with a battery, make sure that next to nothing can affect the measurements made;
2. Dependence on batteries. Periodically have to change a stand-alone power supply.

Universal

Universal indicator screwdriver

Inside this device it is already possible to detect the chip, expanding its capabilities.

For example, it has three modes of operation, which are set by switching a special the slider to the appropriate mark:

• "O" - the presence of voltage in the implementation of the contact test is notified by including built-in light bulb;
• «L» - contactless availabilty current with low sensitivity. It is also accompanied by the appearance of green light on the display;
• "N" - contactless testing with high sensitivity, which allows to detect even field lines under a layer of plaster, which is accompanied by not only a lighted lamp, but also a sound accompaniment.

So use a screwdriver indicator of this type is very convenient and effective.

Of the negative aspects should be highlighted:

• Relatively high cost. Additional elements in the structure of the device, of course, increases the cost of the product;
• Frequent replacement of batteries. Power consumption in these instruments is large enough.

Offers from producers

Now to what can be found on the shelves of specialty stores on this type of tools:

• "OP-1 IEK" model:

The sample model "OP-1 IEK"

• "OP-2E IEK" model:

The sample model "OP-2E IAC"

• "Resanta 6878-28NS» Model:

"Resanta 6878-28NS» model sample

• The model with the display of the liquid crystal «SANTOOL 12-220V":

pattern with a display sample of the liquid crystals «SANTOOL 12-220V"

• «STAYER MASTER 45290" model:

Sample «STAYER MASTER 45290" model

• «Vorel 65233" model:

«Vorel 65233" model sample

• «MEET MS-18" model:

Sample «MEET MS-18" model

• "Uno" model:

Sample "Uno" model

conclusion

You know what a screwdriver indicator is used and what types of case. Well acquainted with some specific models.

Check-wire screwdriver probe

Videos in this article contains additional materials, and questions on the topic, you can ask in the comments.