In this article, we will provide recommendations on how to choose the right current meter, tell you about popular models, the best manufacturers in the Russian market, well-known brands, decide where and which company it is better to buy a device 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 are, to determine the characteristics you need, so as not to make a mistake when choosing.
An ammeter is a tool for studying the strength of an electric current. In principle, its operation is not difficult, usually, it consists of a galvanometer with a parallel connected low resistance shunt resistor.
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 by a small range of measurements. In order to investigate high performance without destroying the winding, the mechanical elements of the apparatus are added with a "shunt" that provides a reduced resistance. It is located in parallel with the circuit of the device, a significant part of the electrons passes 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 fix extreme indicators without destroying the equipment. The ammeter gets its name from the unit of the same name.
To detect electricity in the network below 1 A, milli, micro, nano or picoammeters are used, depending on the magnitude.
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, 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 obsolete, dial gauge is still widely used for research, for example, a panel 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 out of use, they represent a large subgroup that includes various types of ammeters. Let's take a look at this in more detail:
The operation of these devices is based on a mechanical interaction between current and a magnetic field or electrified conductors. They consist of a fixed and movable element attached to an arrow that indicates the value on the scale.
Like all devices of this type, they are cumbersome, prone not only to component wear, but also to large research errors. However, readings are fast, so the products are useful as stationary measuring elements. These tools include 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 temperature, and according to Joule's law, the amount of heat released is proportional to the square of the current. The devices are used on any network.
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
The technological advances of our time have brought electronic devices to the market with a high degree of versatility and performance. With digital instruments, reading errors are eliminated, since the data is displayed on the screen, and moving mechanical parts are replaced by circuits, the wear of such products is minimized, they are easy to use, portable, and made from modern materials.
The two most famous 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 exclusively by a magnetic field created by electricity, and since it has no braid, it cannot burn out.The product is easy to use, the clips are triggered by moderate finger pressure, and close, requiring only one hand. The device can explore AC, DC. The device is actively used in the automotive industry.
Ammeters of Chinese, Russian production, are sold in specialized electrical stores, managers will give you advice on which of the new products to buy, orientate at an average price, suggest a budget model.
You can order your favorite model online, in the online store, on AliExpress and other sites.
Our list is compiled from real reviews, taking into account the opinions 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.
The 5th place is taken by a laboratory apparatus used to determine the standard deviation of the AC power, sinus shape, and power frequency. The device is used to calibrate 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. Units of other ranges are supplied by agreement with the buyer.
Certification data:
Technical indicators:
Parameters | Specifications |
---|---|
Accuracy class | 0.2 or 0.5 |
Measurement limits (two measuring ranges in one device) | 0.5 and 1 A; 10 and 20 A; 5 and 10 A; 2.5 and 5 A |
Temperature | from 10 to 35 ° С |
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 panel. The design of the device provides for a transformer, a moving coil, which provides a measurement range from 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:
Parameters | Specifications |
---|---|
Model | Embedded |
Width | 7.2 cm |
Height | 72 mm |
Voltage type | AC (change) |
Modular design | - |
Calibrated | + |
Accuracy class | 0.5 |
Indicator set | - |
Scale backlight | - |
Through current transformer | + |
Measuring system | Moving coil |
Nominal. final scale value | 100 A |
Overcurrent scale | + |
Max. instrument pointer deflection | 90 ° |
Measuring range | 0 ... 100 A |
3rd place - for М42100 - a high-precision product used by DC networks. Devices М42100, М42101 are manufactured with accuracy classes 1.5 or 2.5.
Features of operation:
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 one sign (plus or minus), then they are repelled, the arrow fixed on the movable element moves.
Technical indicators:
Parameters | Specifications |
---|---|
Accuracy class | 1,5; 2,5 |
Basic error | ±1,5; ±2,5 % |
Variation | 2,25%-3,75% |
The arrow does not return to zero | 1.0-1.7 mm |
Permissible change in readings for every 10 K | ±0,8 %-±1,2 % |
Resting the moving part | no more than 3 s |
dimensions | 80x80x50 mm |
Weight | 0.2KG |
At 2-place ammeter, designed for the study of single-phase, low-voltage AC networks in residential, public or industrial buildings.
The device is registered with the state verification authorities (CN.C.34.004.A # 36109), there are corresponding marks in the passport, on the case.
A protective transparent cover made of non-combustible plastic, insulating the external clamps, provides fire and electrical safety, and the metal shield prevents negative effects of magnetic fields. The equipment is switched on directly.
Technical indicators:
Parameters | Specifications |
---|---|
Ammeter | For installation in a panel |
Measuring system | Moving coil |
Measuring range | 0 ... 30 A |
Through current transformer | - |
Accuracy class | 0.5 |
Voltage type | AC (change) |
Calibrated | + |
Model / execution | Embedded |
Width | 72 mm |
Height | 72 mm |
Nominal. final scale value | 30 A |
Overcurrent scale | + |
Modular design | - |
Max. instrument pointer deflection | 90 ° |
Indicator set | - |
Scale backlight | - |
1st place is confidently occupied 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. А72 X / 5А-1.5 is fastened into the "shield cover" through a transformer and is completed with fasteners.
Technical indicators:
Parameters | Specifications |
---|---|
Type of cutout in the flap cover | 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, ° С | from -30 to +50 |
Calibration interval | 2 years |
Average service life | 12 years old |
Mean time between failures, not less | 50,000 hours |
Guarantee period | 5 years |
Electronic devices have no 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. The comfort of the users is provided by the backlight of the screen, which helps in conditions of poor visibility, it is possible not only to study the obtained data, but also to inspect the surrounding space. The PM8232 has a wide range of indications, including the status of the device's batteries.
It is important to note that the product meets all safety requirements, is ergonomic, suitable for beginners and experienced ones.
The following data can be obtained with a universal device:
The probes in the multimeter model are non-removable. The PM8232 receives data automatically, allowing even beginners to understand the information.There is no overwhelming number of features that can confuse the owner of the device.
Two batteries are used as an energy source. The place under them is closed 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 take into account that disassembling the case is required to replace the fuses.
PM8232 stands out for its high accuracy of research, more suitable for home use, not suitable for high-voltage electrical circuits, it is important to read the limitations in the instructions.
Technical indicators:
Parameters | Specifications |
---|---|
A type | Multimeter |
Types of measurements of electrical circuit parameters | AC current (A ~), DC current (A-), DC voltage (U-), AC voltage (U ~), resistance ® |
Gain of transistors h21 | - |
Continuity check | + |
Diode test | + |
Temperature measurement | - |
Other tests and measurements | Non-contact voltage detection |
Measurements per second | 3 |
Basic error | 0.8 % |
Selection of measuring ranges | Manual |
Display backlight | + |
Nutrition | Batteries AAAx2 |
Equipment | Warranty card, documentation |
Weight | 350 BC |
At the 4th place is a digital ammeter used to measure AC indicators with a frequency of 50 Hertz. The equipment has a relay, switching of which allows it to be used with different transformers.
The product body is designed for DIN-rail mounting. On the front there is a digital indicator "primary current transfer setting". The power supply circuit is structurally (galvanically) separated from the measuring circuit.
At the bottom of the case there are terminals for connecting the equipment to the network, the secondary winding of the transformer. The product is replenished directly from a controlled system. The warranty period of the unit is 2 years, the protection level is 0, EMC in accordance with GOST R50033.92. It is important to study the operating instructions before starting.
Technical indicators:
Parameters | Specifications |
---|---|
Accuracy class | 1 |
Rated supply voltage: | 220±10% |
Rated mains frequency Hz | 50 |
Indication | Seven-segment indicator |
Measured current range | 0…400 |
Number of phases | 1 |
Item type | Ammeter |
Measurement method | Transformer current |
Connection type | Screw connection |
Installation method | DIN rail 35mm wide |
Operating temperature range | -40 ... + 45 ° С |
Weight | 0.2KG |
Manufacturer's warranty | 2 year |
Product manufacturer | Russia |
The 3rd place is taken 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 automatic control system, control of production processes.
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 values are displayed on the digital indicator. The parameters are taken by a non-contact method using a built-in transformer unit.
The investigated current values, the number of network outages are entered into the device's memory. The interface is logical, all information is displayed after pressing the corresponding buttons on the front of the product. The memory is cleared by holding down the shift key for 5 seconds.
It is important to know that the equipment controls the current data, therefore it is not subject to periodic verification.
Design features of VAR-M01-083 AS20-450V UHL4:
The device has a plastic cover, the wires are connected from the front. Installation 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 AC20-450V UHL4 is a reliable, high-tech device for industrial and commercial areas.
Technical indicators:
Parameters | Specifications |
---|---|
Supply voltage | Variable single phase |
AC supply voltage range (variable): | AC 20 ... 450V |
Supply voltage frequency (AC) | 50 Hz |
Measuring voltage range | AC20-450V |
Voltage measurement error | 1% ± 1 least significant digit |
Measured current range: | 0.5 - 63A |
Current measurement error: | 2% ± 1 least significant digit |
Current measurement method: | Contactless |
Using current transformers: | - |
Cross-section of connected conductors: | Not more than 2.5 sq. Mm. |
Relay protection degree by frame / by terminal | GOST 14254-96; IP20 |
Operating temperature range: | -25 ... + 55 ° С |
Relative humidity: | up to 85% (at 25 ° С) |
Weight | 0.1 kg. |
Overall dimensions (WxHxD): | 35x90x63 mm |
Brand name | Meander |
Country of origin: | Russia |
Manufacturer's Warranty: | 2 years |
Life time: | 7 years |
2nd place for a digital multimeter that controls 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 study the network, install the product.
The equipment is used in laboratory power systems, homemade chargers. The electronic display has two lines, 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:
Parameters | Specifications |
---|---|
Working voltage | 0.1-100 V DC |
Note | The maximum input voltage cannot exceed 100V |
Working current | ≤20mA |
Display | 0.28 "Two colors blue and red |
measurement range | DC 0-100V 0-10A |
Minimum resolution (V) | 0.1V |
Update frequency | ≥100mS / times |
Measurement accuracy | 0.01 |
Minimum resolution (A) | 0.01A |
Working temperature | from -15 to 70 ° c |
Operating pressure | from 80 to 106 kPa |
The size | 47 × 28 × 16 mm. |
Net weight | 19 g |
The DIGITOP AM-2 device, with an operating frequency of 50 hertz, designed for AC research, takes the 1st place in the rating. It is a professional grade product with high grade precision, reliable, durable construction, in demand in the market, competing with products from China.
Design features:
Technical indicators:
Parameters | Specifications |
---|---|
Supply voltage | 110-240V AC |
Guarantee | 12 months |
Manufacturer | Digitop |
Measured current | 1 - 50 A |
Operating temperature range (C °) | -10...+50 |
Installation method | 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 for human life, must be taken especially seriously.No matter how much the product costs, you need to choose it in accordance with the established operating procedures.
We hope the review will provide all the information so that your home is always light and warm.