In this article, we will provide recommendations on how to choose the right current meter, talk about popular models, the best manufacturers in the Russian market, well-known brands, decide where and which company is the best device to buy, at the best price.
Today, in electrical stores you can find many types of equipment, with various functions, the purpose of our review is to understand what design features they come with, determine the characteristics you need, so as not to make a mistake when choosing.
An ammeter is a tool for measuring the strength of an electric current. In principle, its operation is nothing complicated, usually it consists of a galvanometer with a low resistance shunt resistor connected in parallel.
During construction or repair, multimeters are used in which you can switch between amperes, volts, ohms.
Content
For more than a hundred years, the field of application of the galvanometer has been the study of electrical networks, its functionality is limited to a small measurement limit. To explore high performance without destroying the winding, the mechanical elements of the apparatus add a "shunt" that provides reduced resistance. It is located in parallel with the circuit of the device, a significant part of the electrons pass through it. This combination of elements gave rise to a new instrument known as the ammeter.
The number of electrons passing through the shunt connection is proportional to their total number in the system, this allows you to record extreme performance without destroying the equipment. The ammeter got its name from the unit of measurement of the same name.
To detect electricity in the network below 1 A, millimeters, micrometers, nanometers, or picoammeters are used, depending on the magnitude.
The operation of the device is based on the principle of electromagnetism, which states that any charged particle that passes through a wire creates a magnetic field around it.
The device is always installed in series with the element to be examined. It is important to note that the influence of the internal voltage, the resistance of the device should be minimal.
Depending on the design, the scope of the product, there are several types of it.Let's look at what you should pay attention to, what selection criteria to rely on when buying one or another option.
Analog Devices
This outdated, pointer apparatus with a scale is still widely used for research, for example, a shield ammeter used to study three-, single-phase AC networks. Such devices are divided into two groups, differing in the mechanism that drives the indicator pointer:
Although thermal instruments have largely fallen into disuse, they are a large subgroup that includes various types of ammeters. Let's look at it in more detail:
The operation of these devices is based on the mechanical interaction between current and magnetic field or electrified conductors. They consist of a fixed and movable element attached to an arrow that indicates the value on a scale.
Like all devices of this type, they are bulky, subject not only to component wear, but also to large errors in research. However, readings are fast, so the products are useful as stationary measuring elements. Among these tools are the following:
In the corner of the display of each device there is a marking that allows you to distinguish an ammeter with a moving element from an electrodynamic one, or to determine in which networks it can be used.
2. Thermal ammeters
The operation of these products is based on the principle of expansion of conductors when heated. It is proportional to the temperature, and in accordance with the Joule law, the amount of heat generated is proportional to the square of the current strength. Devices are used in any networks.
The advantage of thermal devices is that they are not affected by external magnetic fields, they can be mounted on a DIN rail. However, the high energy consumption required to heat the conductor, the high cost of these devices makes them unprofitable for widespread use.
3. Digital ammeters
Technological advances of our time have brought to the market electronic devices with a high degree of versatility and performance. With digital instruments, reading errors are eliminated because data is displayed on the screen and moving mechanical parts are replaced by circuits, wear and tear is minimized, they are convenient to use, portable, and made from modern materials.
The two most well-known instruments in this category are the multimeter, the amperometric clamp. Both models are available in analog and digital versions, relatively inexpensive, the latter being the most popular:
The device is powered solely by the magnetic field generated by electricity, and since it does not have a braid, it cannot burn. The product is easy to use, the clips are triggered by moderate finger pressure, they close with the effort of only one hand. The device can explore AC, DC. The device is actively used in the automotive industry.
Chinese and Russian-made ammeters are sold in specialized electrical stores, managers will give you advice on which of the new products to purchase, orient you at an average price, and suggest a budget model.
You can order the model you like online, in the online store, on AliExpress and other sites.
Our list is based on real reviews, takes into account the opinion of buyers who purchased ammeters for personal use. It provides a description of analog, digital devices.
Such devices have mechanical parts in their design: magnets, coils with indicator needles.
5th place is occupied by a laboratory apparatus that serves to determine the standard deviation of the AC force, sine waveform, and industrial frequency. The device is used for calibration of less accurate instruments, verification during testing.
The design of EA2265 includes:
Unit features:
The devices are manufactured in 2 accuracy classes: 0.2 or 0.5. By agreement with the buyer, units of other ranges are supplied.
Certification details:
Technical indicators:
Options | Characteristics |
---|---|
Accuracy class | 0.2 or 0.5 |
Measurement limits (two measuring ranges in one instrument) | 0.5 and 1 A; 10 and 20 A; 5 and 10 A; 2.5 and 5 A |
Temperature | from 10 to 35 °C |
Relative Humidity | 80% at 20° |
dimensions | 243 x 200 x 100 mm |
Weight | no more than 3 kg |
On the 4th place in our list is low-voltage equipment installed in a shield. The design of the device includes a transformer, a moving coil, which provides a measurement range of 0-100 A. The built-in model from TDM ELECTRIC is calibrated, used in AC (variable) networks, has an accuracy class of at least 1.5
Technical indicators:
Options | Characteristics |
---|---|
Model | Embedded |
Width | 7.2 cm |
Height | 72 mm |
Voltage type | AC (variable) |
Modular design | - |
Calibrated | + |
Accuracy class | 0.5 |
Set of indicators | - |
Scale illumination | - |
Via current transformer | + |
Measuring system | moving coil |
Rated final scale value | 100 A |
Overcurrent scale | + |
Max. deviation of the instrument pointer | 90 ° |
Measuring range | 0 ... 100 A |
3rd place - M42100 - a high-precision product used by DC networks. Devices M42100, M42101 are produced with accuracy classes 1.5 or 2.5.
Operating features:
The operation of the M42100 is based on the interaction of a magnetic field with one or more cores. The stationary and active parts of the structure are magnetized with the same sign (plus or minus), then they repel each other, the arrow fixed on the movable element moves.
Technical indicators:
Options | Characteristics |
---|---|
Accuracy class | 1,5; 2,5 |
Basic error | ±1,5; ±2,5 % |
Variation | 2,25%-3,75% |
Pointer not returning to zero | 1.0-1.7mm |
Permissible change in readings per 10 K | ±0,8 %-±1,2 % |
Rest of the moving part | no more than 3 s |
dimensions | 80x80x50mm |
Weight | 0.2 kg |
On the 2nd place is an ammeter designed to study single-phase, low-voltage AC networks in residential, public or industrial buildings.
The device is registered with the state verification bodies (CN.C.34.004.A No. 36109), there are corresponding marks in the passport, on the case.
A protective transparent cover, made of non-flammable plastic, insulating external clamps, provides fire and electrical safety, and a metal shield prevents the negative effects of magnetic fields. The equipment is switched on in a direct way.
Technical indicators:
Options | Characteristics |
---|---|
Ammeter | For installation in a shield |
Measuring system | moving coil |
Measuring range | 0 ... 30 A |
Via current transformer | - |
Accuracy class | 0.5 |
Voltage type | AC (variable) |
Calibrated | + |
Model/Version | Embedded |
Width | 72 mm |
Height | 72 mm |
Ratedfinal scale value | 30 A |
Overcurrent scale | + |
Modular design | - |
Max. deviation of the instrument pointer | 90 ° |
Set of indicators | - |
Scale illumination | - |
1st place is confidently taken by A72 X / 5A-1.5, a device without a scale, used in single-phase, low-voltage AC networks, adapted for residential complexes or commercial real estate.
The body is made of non-combustible materials that guarantee fire safety. A72 X / 5A-1.5 is mounted in the "shield cover" through a transformer, complete with fasteners.
Technical indicators:
Options | Characteristics |
---|---|
Cover cutout type | Square cut (68x68 mm) |
Connection method | transformer |
Maximum measured current, A | 5-4000. |
Front panel size, mm | 72x72 |
Accuracy class | 1.5 |
Measuring network frequency, Hz | 50 |
Rated voltage, V | 230 |
Mounting plane position | Vertical ±5% |
Degree of protection | IP54 |
Weight | 0.13 kg |
Operating temperature range, °C | -30 to +50 |
Calibration interval | 2 years |
Average service life | 12 years |
Mean time between failures, not less than | 50,000 hours |
Guarantee period | 5 years |
Electronic devices do not have mechanical parts in their design, only circuits, which makes them more wear-resistant, more accurate than analog ones.
5th place in a small, compact model, convenient in everyday life, allowing you to measure many useful parameters.Comfort for users is provided by the backlight of the screen, which helps out in conditions of poor visibility, you can not only study the received data, but also examine the surrounding space. The PM8232 has a large set of indications, including the state of the device's batteries.
It is important to note that the product meets all safety requirements, is ergonomic, suitable for beginners and experienced.
The universal device can obtain the following data:
The probes in the multimeter model are non-removable. PM8232 receives data automatically, making it easy for even beginners to understand the information. There is no excessive number of functions that can puzzle the owner of the device.
Two batteries are used as a power source. The place under them is covered with a lid, fixed with a screw, so the owner should not worry about losing batteries while working with the gadget. It is important to note that changing the fuses requires disassembling the case.
PM8232 stands out for its high research accuracy, more suitable for home use, not suitable for high-voltage electrical circuits, it is important to read the limitations in the instructions.
Technical indicators:
Options | Characteristics |
---|---|
Type of | multimeter |
Types of measurements of electrical circuit parameters | AC current (A~), DC current (A-), DC voltage (U-), AC voltage (U~), resistance ® |
h21 transistor gain | - |
Continuity Check | + |
Diode test | + |
Temperature measurement | - |
Other tests and measurements | Non-contact voltage detection |
Number of measurements per second | 3 |
Basic error | 0.8 % |
Selection of measuring ranges | Manual |
Display backlight | + |
Food | Batteries AAAx2 |
Equipment | Warranty card, documentation |
The weight | 350 g. |
On the 4th place is a digital ammeter used to measure AC indicators with a frequency of 50 Hertz. The equipment has a relay, the switching of which allows it to be used with different transformers.
The body of the product provides for mounting on a DIN rail. On the front there is a digital indicator "primary current transfer setting". The power circuit is structurally (galvanically) separated from the measuring one.
At the bottom of the case there are terminals for connecting the equipment to the network, the secondary winding of the transformer. The make-up of the product is carried out directly from the controlled system. The warranty period of the unit is 2 years, protection level - 0, EMC in accordance with GOST R50033.92. It is important to read the instruction manual before starting.
Technical indicators:
Options | Characteristics |
---|---|
Accuracy class | 1 |
Rated supply voltage: | 220±10% |
Rated mains frequency Hz | 50 |
Indication | Seven-segment indicator |
Measuring current range | 0…400 |
Number of phases | 1 |
Product type | Ammeter |
Measurement method | Transformer current |
Connection type | screw connection |
Mounting method | DIN rail 35mm wide |
Operating temperature range | -40…+45 °С |
The weight | 0.2 kg |
Manufacturer's Warranty | 2 year |
Product manufacturer | Russia |
3rd place is occupied by a device designed to check the current voltage parameters in AC networks. The equipment, as the main or additional indicator, can be built into the system of automatic control, production process management.
The energy for the operation of the device is consumed from the controlled network. If the voltage has a value from 20 to 450 V, then the current indicators are displayed on the digital indicator. The parameters are taken by the non-contact method, using the built-in transformer unit.
The studied current values, the number of network outages are stored in the device's memory. The interface is logically clear, all information is displayed after pressing the corresponding buttons on the front side of the product. The memory is reset by pressing the switch key for 5 seconds.
It is important to know that the equipment controls the current data, so it is not subject to periodic verification.
Design features VAR-M01-083 AS20-450V UHL4:
The device has a plastic casing, the wires are connected from the front. Mounting is carried out using a DIN rail, 35 mm wide (GOST R IEC 60715-2003) or on a smooth surface.
The device provides the specified modes of operation under the following conditions:
VAR-M01-083 AS20-450V UHL4 is a reliable, high-tech device for industrial and commercial areas.
Technical indicators:
Options | Characteristics |
---|---|
Supply voltage | AC single phase |
Supply voltage range AC (variable): | AC 20...450V |
Supply voltage frequency (AC) | 50 Hz |
Measured voltage range | AC20-450V |
Voltage measurement error | 1% ±1 LSD |
Measured current range: | 0.5 - 63A |
Current measurement error: | 2% ±1 LSD |
Current measurement method: | Contactless |
Use of current transformers: | - |
Cross section of connected conductors: | Not more than 2.5 sq. mm. |
Degree of relay protection by housing / by terminals | GOST 14254-96; IP20 |
Operating temperature range: | -25…+55°С |
Relative humidity: | up to 85% (at 25°С) |
The weight | 0.1 kg. |
Dimensions (WxHxD): | 35x90x63 mm |
Brand | Meander |
Country of origin: | Russia |
Manufacturer's Warranty: | 2 years |
Life time: | 7 years |
2nd place at the digital multimeter that controls the voltage (0 - 100V). ZC15400 has a built-in 10A DC shunt, which makes it possible not to connect an external one, making it easier to explore the network, install the product.
The equipment is used in laboratory power systems, self-made chargers.The electronic display has two lines, of different colors, for displaying data. This feature of the device significantly increases the convenience in reading information.
For installation, you need to make rectangular openings in the surface where you plan to install the equipment, insert it, no additional fastening is required, the latches built into the case will hold the device in place.
The ZC15400 is powered from the network, which it diagnoses or from it. The kit includes wires for mounting the device and measuring parameters.
Technical indicators:
Options | Characteristics |
---|---|
Working voltage | 0.1-100V DC |
Note | The maximum input voltage cannot exceed 100V |
Operating current | ≤20mA |
Display | 0.28" Two colors blue and red |
measurement range | DC 0-100V 0-10A |
Minimum resolution (V) | 0.1 V |
Update frequency | ≥100mS/time |
Measurement accuracy | 0.01 |
Minimum resolution (A) | 0.01A |
Working temperature | -15 to 70°c |
Operating pressure | from 80 to 106 kPa |
The size | 47 × 28 × 16 mm. |
Net weight | 19 g |
The device DIGITOP AM-2, with an operating frequency of 50 hertz, designed for AC research, takes 1st place in the rating. It is a professional grade product with high-class accuracy, reliable, durable design, and is in demand in the market, competing with products from China.
Design features:
Technical indicators:
Options | Characteristics |
---|---|
Supply voltage | 110-240VAC |
Guarantee | 12 months |
Manufacturer | Digitop |
Measured current | 1 - 50 A |
Operating temperature range (С°) | -10...+50 |
Mounting method | On Din-rail |
Type of shell | 3S |
Dimensions(mm) | 52.5x90x63 |
Degree of protection | IP20 |
The choice of an ammeter, due to the increased danger of electric current to human life, must be taken especially seriously. No matter how much the product costs, you need to choose it according to the established operating regulations.
We hope the review will provide all the information so that your home is always light and warm.