How to deal with measuring devices
- Working principle
- Work safety rules
- Measurement command
- Useful “trick”.
- Example of use
As the name suggests, TC or Dietze pliers are designed to measure the AC current in a circuit without breaking it. The operation of the current measuring instrument is based on the principle of a simple current transformer. In this case, the primary winding is a bus or cable with a measured current, and the tick pick, inside which there is a multi-turn winding, wound on a magnetic core made of ferromagnetic material, is the secondary. The alternating current in the wire (primary coil) creates an alternating magnetic field, the lines of force of which pass through the secondary winding, which excites an emf in it, proportional to the magnitude of the current in the primary coil. Thus, by measuring the resulting EMF, one can find the current strength in the first coil (wire).
Modern multimeters, regardless of the manufacturer or modification, contain the following elements: magnetic cores with a movable lever, a switch for measuring measuring ranges, a display, output connectors for probes (in this case, the multimeter can be used as a regular multimeter) and a button for selecting Current measurements (image below)
Most modern current meters also include an internal transformer with a diode bridge. In this case, the terminals of the secondary winding are connected across the shunt. Depending on the range of measured current strengths, the current meter can be one-handed (for voltages up to 1000 V) and two-handed with additional insulated handles (for voltages from 2 to 10 kV inclusive). Current metering devices designed to measure more than 1 kV have an insulating length of less than 38 cm, and handles of at least 13 cm.
As a rule, the safety class and maximum current are indicated on the device case. For example:
- CAT III 600 V – this means that the device is protected against short-term surges in equipment during operation in fixed networks with a voltage of up to 600 V.
- CATIV 300 V – This means that the device is protected from power surges within basic level equipment for power supply voltages up to 300 V. An example of such equipment is a traditional electric meter.
Work safety rules
Mounting meters can only be used indoors or outside in dry weather. The strength of the current can be measured on both insulation-sheathed cables and bare cables. Before use, a person needs to wear protective gloves, put an insulating base under his feet and wear special shoes.
How to use the measuring instrument meters:
- Set the desired range on the switch.
- Press the button to open the magnetic circuit.
- Install one connector in an AC or DC network (if the device supports this feature).
- Position the current meter perpendicular to the direction of the wire.
- Read the offer.
The difficulty of using instrument meters often lies in the isolation of a single conductor: when trying to take readings from a conventional cable coming from an outlet, zero should be displayed on the display. This is because the currents of the phase conductor and the neutral conductor are equal in magnitude and opposite in direction. Thus, the magnetic fluxes generated by them are mutually compensated. If the current readings are non-zero, this indicates the presence of a circuit leakage whose value equals the value obtained. Therefore, for measurements, you need to find a place where the wires are separated and highlight one core. As such, you can use a switchboard or place to connect the phase wire to the circuit breaker. However, this cannot always be done, which limits the range of instrument meters.
If a unit is displayed on the screen during measurements, this indicates that the current in the wire is outside the measurement range. In this case, it is necessary to increase the range of current measurements with the switch. When taking measurements in hard-to-reach places, you can use the Hold button. With its help, you can record the result of the last measurement. By pressing Hold a second time, you can reset the value.
If it is required to measure a small value of the current strength, it is necessary to make several turns of the wire on an open magnetic circuit, setting the range switch to a minimum. Next, it is necessary to take readings, and, determining the actual value, divide the resulting number by the number of wound cycles.
Example of use
Below is an example of how meters are used when measuring the load in a 220 V network, for example in an apartment. In this case, the switch should be set to the AC 200 position. Next, with the current measured, hold the insulated conductor and take the readings. Next, the obtained value of the current strength must be multiplied by the voltage in the 220 V network. For example, if the device shows 5 amperes, the power consumed in the network will be P = U * I = 5 * 220 = 1100 watts or 1.1 kW. The obtained value can be used to check the operation of electricity meters.
If you have any inquiry, please contact us freely and we will be happy to serve you.
When we say Jeezly website, we are talking about one of the most famous Arab websites that was able, in a very short period of time, to achieve a very large demand for purchases from it by people from various parts and sectors of the Arab world.
On the Jeezly website, you will find a joint look and all the products that you may need in your home, starting with those for kitchens or bathrooms, but even those for gardens, you will find them on this wonderful site.
So, if you were lost before and did not know where to go to buy your products on the Internet, now you have the perfect solution, and all you have to do is go to the Jezli website and start choosing the products you want.
Since we are talking about a site that is preferred by many people around the world, there is no doubt that it is a site full of various features and characteristics. Therefore, we have decided to devote our next paragraph to pointing out the most prominent features of the Jezli site.
One of the most prominent features of the site is the proportionality of prices. On the Jeezly website, you do not have to worry about the imaginary prices of the products, as is the case with most sites that display their products on the Internet.
The price of delivering products is very reasonable and not expensive, and the site accepts delivery to various countries, without forgetting that it accepts free shipping on some products.
One of the features of the site is also the high quality of its products, as it is impossible to find a poor quality product. Rather, the Jezli website deals with the major companies, Philips, for example, and other famous brands, so you must remove from your mind the idea of the poor quality of one of the products. Another advantage of the site is that it does not specialize in one type of product, but rather you will find various types of products on it, for example, electrical appliances, hand tools, mechanical devices, paints, packages for establishing apartments, and many other types.
Jeezly website also accepts what is known as the shopping cart, which makes it easy for you to filter the products you want to buy and put them in one package in order to be able to pay with the click of a single button.
Accepts multiple payment methods.
We are pleased that you visit our social media pages, where we publish exclusive offers on our website.
Our Facebook page is here .
Our Twitter account is here .