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This section provides an overview for low resistance testers as well as their applications and principles. Also, please take a look at the list of 17 low resistance tester manufacturers and their company rankings. Here are the top-ranked low resistance tester companies as of December, 2024: 1.AEMC(R) Instruments, 2.GMC-INSTRUMENTS Group, 3.Wuhan Huaying Electric Power Tech & Science Co., Ltd.
Table of Contents
A low resistance measuring instrument is a device that can measure minute resistances in units of milliohms, which is less than 1 ohm.
General resistance measuring instruments cannot measure resistance of less than 1 ohm with high accuracy because they are affected by the contact resistance between the measuring instrument and the resistance and the wiring resistance of the measuring leads. A low resistance measuring instrument, on the other hand, is less affected by contact resistance and wiring resistance, and can measure resistances of less than 1 Ohm with high accuracy.
Low resistance measuring instruments are used to measure the resistance of various samples. Specifically, they are used for measuring the winding resistance of motors, solenoids, and choke coils. They are also used to measure the contact resistance of wire harnesses, connectors, and switch contacts; and wiring resistance on printed circuit boards.
Low resistance measuring instrument should also be used to measure the resistance of current fuses and shunt resistors, and the DC resistance of conductive rubber.
General resistance measuring instruments measure resistance using the 2-terminal method, while the measurement method used by the Low resistance measuring instrument to measure resistance is the 4-terminal method.
The two-terminal method uses a common lead wire for the current source and a common lead wire for the voltmeter. The current from the current source also flows through the voltmeter leads during resistance measurement, causing a voltage drop in the leads and in the contact resistance, resulting in a measurement error during resistance measurement.
The 4-terminal method uses the current source and voltmeter leads independently. Since no current flows in the voltage measurement leads and no voltage drop in the leads and contact resistance occurs, resistance can be measured with high accuracy.
Set the resistance range of the low resistance measuring instrument according to the resistance value. There are two ways to set the resistance range: manual mode and auto mode. Use manual mode if you want to set the resistance range arbitrarily, and select auto mode if you want to set the resistance range automatically.
If you select auto mode, you have the advantage of not having to change the resistance range setting yourself. However, in the case of wire-wound resistance of motors, solenoids, choke coils, etc., the measured value may not be stable in the auto range. In such cases, it is better to set the resistance range manually and then measure the resistance value.
Increasing the measurement current as much as possible increases the voltage at both ends of the resistor, which improves measurement accuracy. However, increasing the measurement current increases the current consumption of the resistor and causes the resistor to heat up.
As the resistor heats up, it is prone to problems such as resistance breakage, changes in resistance value, and magnetization of the resistor. These problems may result in incorrect resistance measurement. Conversely, if the measurement current is reduced, the voltage at both ends of the resistor becomes smaller, making it easier to be affected by external noise during measurement and making it more difficult to stabilize the measured value.
Slow down the measurement speed as much as possible, this will produce better measurement accuracy and the less the influence of extraneous noise. Faster measurement speeds shorten the measurement time, but are more susceptible to extraneous noise and make it more difficult to stabilize the measured value.
If the resistance measurement is affected by external noise, the measured value will not be stable and correct measurement will not be possible. Adequate shielding or twisting of lead wires can reduce the influence of external noise.
*Including some distributors, etc.
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Prostat Corporation, founded in 1992 and headquartered in Glendale Heights, Illinois, is a manufacturer of premium ESD control-related instruments. Some of the products that the company offers include resistance meters, static field meters, ionization contact voltmeters, walking test systems, and surface resistance probes. These products support ANSI/ESD S20.20 and IEC 61340-5-1 ESD program standards and are used for addressing device safety from static discharges due to automated equipment and handling by personnel.
AEMC(R) Instruments established in Dover, New Hampshire in 1976 is a manufacturer of electrical test and measurement instruments for the industrial, commercial, and utility marketplace. Their product portfolio includes transformer ratiometers, harmonic power meters, data loggers, thermal imaging cameras micro-ohmmeters, and environmental testers. The company's products are used in industries including Aerospace and Defense, Transportation, Medical Devices, and Power and Energy. They also provide training seminars, technical support, customer service, repair, and calibration.
Weschler Instruments, founded in 1941 as Weschler Electric, is an American manufacturer and distributor based in Cleveland, Ohio, specializing in electrical and electronic measuring instruments. Within its product lineup, the company offers a range of instruments, including analog meters, digital bargraph and power meters, transformer monitors, and the Zahn viscometer, accompanied by relevant accessories. Additionally, the company supplies products from other manufacturers, encompassing current, instrument, and voltage (potential) transformers, as well as power and energy management instruments. Test equipment, measurement, and control accessories are also available. The company serves various industries, including electric power, oil and gas, mining, marine, and wastewater management.
Founded in 1940, Kyoritsu has an 80 year history as a customer-focused organization specializing in multimeters. Kyoritsu provides analog multimeters as well as digital multimeters with and without clamps offering many varieties of measurement.
Changzhou Tonghui Electronic Co. Ltd. is a manufacturer of electronic testing and measurement instruments founded in 1994 and based in Changzhou, Jiangsu, China. The company produces equipment used for testing and measurement processes, and related accessories. Its products include capacitance meters, insulation testers for electrical safety compliance testing, and automatic semiconductor test systems. It also offers data loggers, power supply units, and test leads. The company's products are mainly used by clients in the microelectronics, semiconductor, and defense sectors.
Seaward Electronic Ltd, since 1982 is a manufacturer of electrical safety test equipment and software headquartered in Peterlee, United Kingdom, with an additional office in Tampa, Florida. The company’s product portfolio includes portable appliances, solar PV, manufacturing, medical device, and high-voltage testers. They offer various medical equipment testers such as electrical safety analyzers, patient simulators, defibrillator analyzers, and electrosurgical analyzers. They offer various electrical testers for testing resistance such as milliohmmeters, microhmmeters, and decade resistance boxes, and high voltage such as phasing sticks, voltage indicators, and safe discharge rods.
Desco Industries Inc., founded in the United States in 1956, is a manufacturer of continuity and voltage testers called the Circuitracers. The company's product portfolio includes component rework machines, bags, wrist straps, worksurface and floor matting, and laminates. It also manufactures chemicals, grounding, personnel identification, material handling, and training products. The company's inventory locations include one in Japan, two UK locations, and nine locations in the United States of America and it also maintains a sales office in Singapore.
Multi Measuring Instruments Co., Ltd. was founded in Chiba, Japan in 1986 and is headquartered in Tokyo. As per its namesake, Multi offers a vast array of measuring and testing equipment used across a number of industries. Some of their offerings include voltage meters, network testers, lux meters, cable locators, sound meters, various thermometers, gas analyzers, and water quality meters. Multi Measuring Instruments has a mission for its products to improve the global environment by detecting inefficiencies and leaks, developing products that will be useful for solar and wind power generation.
Gossen Metrawatt GmbH, founded in 1906 as Guggenheimer AG and currently a subsidiary of GMC Instruments Group, is a manufacturer and supplier based in Nürnberg, Germany, developing measuring technology systems. The company’s measuring and test technology is designed for electric safety in systems, devices, and machines. This technology is also applicable in areas such as e-mobility and medical engineering. It also offers battery testing technology, multimeters, calibrators, and power supply technology. Its product range further includes technology developed by other companies, such as Camille Bauer Metrawatt AG, including indicator instruments and transducers.
MEWOI ELECTRONICS CO., established in 2006 and based in Guangzhou City, China, is a manufacturer and supplier specializing in testing instruments. The company's product portfolio includes insulation resistance testers, battery internal resistance voltage testers, and AC leakage current sensors. These products are used in various industries, including industrial manufacturing, telecommunications, and the power and electrical industry. The company offers services including technical support, customization of parameters according to customer requirements, and fast delivery to reduce capital costs.
Egismos Technology Corporation, established in 1995 and based in Burnaby, Canada, is a manufacturer and supplier of laser-based optoelectronics solutions. The company's product range includes Laser sensing, Laser module, Laser diode, Laser optics, and Laser driver IC. These products find applications in diverse areas, such as consumer electronics, medical devices, robotics, and various industrial projects. It serves markets ranging from the consumer industry to the medical fields and robotics. Its core services include customer satisfaction, embracing change, fostering partnerships and alliances, and ensuring transparent communication.
GMC Instruments is the result of a merger in 1993 from companies originally dating back to 1906. Under the Gossen Metrawatt and Camille Bauer brands, the company provides hardware, software, and services to several industries including medical devices and manufacturing. The company’s hardware division provides electrical safety devices, photometry equipment, energy management systems, and vital signs measurement devices. The company’s software lineup includes database management software, power analysis software, and medical device software.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | AEMC(R) Instruments |
12.5%
|
| 2 | GMC-INSTRUMENTS Group |
6.3%
|
| 3 | Wuhan Huaying Electric Power Tech & Science Co., Ltd |
6.3%
|
| 4 | Megger |
6.3%
|
| 5 | Changzhou Jinko Electronic Technology Co., Ltd. |
6.3%
|
| 6 | Changzhou Tonghui Electronic Co. Ltd. |
6.3%
|
| 7 | Wavecom |
6.3%
|
| 8 | AMECaL |
6.3%
|
| 9 | Desco Industries Inc. |
6.3%
|
| 10 | Prostat Corporation |
6.3%
|
Derivation Method
The ranking is calculated based on the click share within the low resistance tester page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
China
|
4 | 33.3% |
|
United States of America
|
3 | 25.0% |
|
Japan
|
2 | 16.7% |
|
United Kingdom
|
2 | 16.7% |
|
Germany
|
1 | 8.3% |
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