This section provides an overview for earth resistivity meters as well as their applications and principles. Also, please take a look at the list of 10 earth resistivity meter manufacturers and their company rankings. Here are the top-ranked earth resistivity meter companies as of June, 2023: 1.Chauvin Arnoux Metrix.
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An earth resistivity meter is a device that measures the electrical resistance between an electrical device and the earth. It is one of the most familiar devices for electricians and electrical practitioners. Grounding refers to the connection between the earth and electrical equipment.
When an abnormality occurs in electrical equipment, a person touching the equipment may receive an electric shock. By grounding electrical equipment, it is possible to release the electric current to the earth in the event of an abnormality. Secure grounding is very important for the safety of electrical equipment. The state of being securely grounded is called "grounded."
Earth resistivity meters are used for grounding work and electrical equipment inspections. Grounding is the process of burying a metal or other electrical conductor deep underground. It is one of the most important works for electricians, and is classified into four types from A to D according to the intended use of the grounding.
The grounding pole for high-voltage equipment is called Class A grounding, which must maintain a resistance of 10 Ω or less, and the grounding pole for low-voltage equipment of 100 to 200 V is called Class D grounding, which is specified as having a resistance of 100 Ω or less.
During grounding work, check the grounding resistance using an earth resistivity meter. Electricians and chief electrical engineers use earth resistivity meters on a daily basis.
The measurement principle of the earth resistivity meter is Ohm's law. The earth resistivity meter applies an alternating voltage between the pole to be measured and the pole to be compared. After the voltage is applied, the current flowing between the two poles is measured, and the ground resistance is calculated by dividing the current by the applied voltage.
Although the above method can be used to calculate the ground resistance, this method measures the ground resistance of the target pole and the pole to be compared, plus the ground resistance of the two poles. Therefore, a separate grounding pole dedicated for voltage measurement is provided to measure the grounding resistance of the target pole only.
If a DC voltage is used in the earth resistivity meter, electrolysis occurs and the current value cannot be determined. Therefore, AC power is often used in earth resistivity meters. Since AC power supplies are affected by lead capacitance at higher frequencies, power supplies with a frequency of 1 kHz or lower are used.
There are three types of earth resistivity meters: analog display, digital display, and the method of reading the scale value when the scale needle displays "0". As an example, the procedure for using an analog display type is shown below.
The earth resistivity meter comes with a metal rod called an auxiliary grounding pole, which is embedded in the ground when measuring earth resistance.
The procedure for other earth resistivity meters is basically the same as the analog display method, but the "read the scale value when the scale needle shows "0"" method reads the scale value when the scale needle shows "0". The green, red, and yellow wires attached to the earth resistivity meter are used to connect each grounding pole to the terminals on the body of the earth resistivity meter.
In addition to these, there are also clamp-type earth resistivity meters that measure earth resistance by clamping the ground wire. It is easy to measure because there is no need to bury the auxiliary pole in the ground, but it can be used only in the case of multiple grounding.
Insulation testers and earth resistivity meters differ in measurement items and objects to be measured. An insulation tester measures an electric circuit to check the insulation status, while a grounding tester measures the grounding pole to check the grounding resistance.
The insulation tester applies a DC voltage, while the earth resistivity meter applies an AC voltage. Although the appearance and names of the devices themselves are similar, it is important to understand the above-mentioned differences between them in advance.
*Including some distributors, etc.
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Yokogawa Test & Measurement Corporation was founded in Japan in 1954. Yokogawa currently serves a wide array of industries including the aerospace, automotive, consumer electronics, semiconductor and telecommunications industries with both hardware and software solutions. Among Yokogawa’s suite of products are oscilloscopes, voltage probes, power analyzers and meters, data acquisition tools, optical test equipment, a wide variety of handled meters, calibrators, and testers; analog instruments, and manometers.
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.
Headquartered in Everett, Washington, Fluke is an American-born company operating since 1948. Fluke offers a variety of testing equipment including digital multimeters, thermal cameras, solar PV testing equipment, thermometers, oscilloscopes, leak detection devices, as well as testing-equipment related accessories. Fluke offers direct online sales.
Chauvin Arnoux began in 1893 in France and took off in 1905 with the invention of the magneto ohmmeter. Chauvin Arnoux is an integrated manufacturer of portable test and measurement instruments used in the electrical sector, education, laboratories, and maintenance. A sample of Chauvin Arnoux’s products include calibrators, electrochemical measurements, relays, analystical software, and accessories. Chauvin Arnoux also offers industrial subcontracting, leveraging its large network of independently operating yet functionally integrated subcontractors’ abilities to manufacture and install PCBs, specialty items, sheet metal, tooling, and more.
Guangzhou Pinch Co., Limited (Pintech) was founded in 2006 and is headquartered in Guangzhou, China. The company is a developer and researcher of electronic measurement and testing instruments in conjunction with the South China University of Technology. The company offers white-label and OEM services for its products. The company has obtained more than 30 international invention patents and technology patents for its products. The company’s product list includes differential probes, current probes, oscilloscope probes, and high-voltage probes.
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.
Hioki E.E. Corporation was founded in 1935 and headquartered in Ueda, Nagano. Hioki provides testing & analysis, manufacturing & inspection, and equipment maintenance to industries including mobility, battery, motor, energy, electronic components, and infrastructure. Hioki’s has 10 primary product categories which are: recorders and data loggers including oscilloscopes, LCR/Resistance Meters, safety testing including signal generators and calibrators, power meters including power quality analyzers, probes & sensors, optical & PV maintenance & telecommunication, environmental measuring, DMM & testers & field measuring, IoT & new solutions & meter relay, and bare board & package testing.
Ranking as of June 2023 in United States of AmericaDerivation Method
|1||Chauvin Arnoux Metrix||100%|
Ranking as of June 2023 GloballyDerivation Method
|1||Chauvin Arnoux Metrix||37.5%|
Derivation MethodThe ranking is calculated based on the click share within the earth resistivity meter page as of June 2023. 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.
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