10 Earth Resistivity Meter Manufacturers in 2022
This section provides overview, applications, and principles of earth resistivity meters. Also, please take a look at the list of 10 earth resistivity meter manufacturers and their company rankings.
Table of Contents
What Is an Earth Resistivity Meter?
An earth resistivity meter is an instrument that measures the electrical resistance between electrical equipment 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. The safety of electrical equipment needs to be securely grounded.
Principle of Earth Resistivity Meters
The measurement principle of the earth resistivity meter is Ohm's law. An alternating voltage is applied between the pole to be measured and the pole to be compared by the earth resistivity meter. 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 plus the pole to be compared. Therefore, a separate grounding pole dedicated to 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.
How to Use Earth Resistivity Meters
There are three types of earth resistivity meters: analog display type, digital display type, and type that reads 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 grounding resistance.
- Step 1: Embed the first auxiliary grounding pole P at a distance of about 10 m from the grounding pole to be measured (hereinafter referred to as "grounding pole E").
- Step 2: Place an auxiliary grounding pole C at a distance of about another 10 meters on the straight line extension connecting the grounding pole E and the grounding pole P.
- Step 3: Connect each grounding pole to each terminal of the earth resistivity meter.
- Step 4: Confirm that the battery capacity is OK and that the voltage between E and P is less than the allowable value.
- Step 5: Press the measurement button, and the value displayed is the value of the grounding resistance.
The procedure is basically the same for other types of installation resistance testers as for 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 grounding 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.
Other Information on Earth Resistivity Meters
Difference Between a Earth Resistivity Meters and Insulation Resistance Testers
Insulation testers and earth resistivity meters differ in measurement items and measurement objects. Insulation testers measure an electric circuit to check insulation, whereas earth resistivity meters measure a grounding pole to check ground resistance.
Insulation testers apply DC voltage, while earth resistivity meters apply AC voltage. Although the appearance and names of the devices are similar, it is essential to understand their differences in advance.
List of 10 Earth Resistivity Meter Manufacturers
*Including some distributors, etc.
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HIOKI
Ground resistance tester
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PCE Instruments
Earth Tester / Earth Resistance Meter
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Earth Resistivity Meter Manufacturer Ranking
*Including some distributors, etc.Ranking as of January 2023 in United States
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Chauvin Arnoux Metrix | 100% |
Ranking as of January 2023 Globally
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Chauvin Arnoux Metrix | 100% |
Derivation Method
The ranking is calculated based on the click share within the earth resistivity meter page as of January 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.Number of Employees
- Yokogawa Test & Measurement Corporation: 250
- Kyoritsu: 200
Newly Established Company
- PinTech: 2006 (17 years ago)
- PCE Instruments: 1999 (24 years ago)
- PROMAX: 1963 (60 years ago)
Company with a History
- Chauvin Arnoux Metrix: 1905 (118 years ago)
- GMC-I Messtechnik: 1906 (117 years ago)
- Kyoritsu: 1940 (83 years ago)
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