When to Use earth resistance testers wholesale？

Soil resistance measuring instrument

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A grounding resistance tester also called an earth tester is a soil resistance measuring instrument. It is used for sizing and projecting grounding grids.[1]

Digital Earth resistance tester Analog Grounding resistance tester schematic Graph of Comparison analog and digital grounding resistance testers

The first soil resistance measuring instrument was invented in the 1950s by Evershed & Vignoles Meggers who made the first insulation and earth resistance testers.[2] One of the most used analog grounding testers in USSR were М416.[3] From the 21st century several companies produced digital earth resistance meters and testers. The main purpose of the instrument[4] is to determine the adequacy of the grounding of an electrical system. By a standard of the National Electrical Code[5] the resistance of the soil should be less than 25 Ohms to reliably and efficiently ground the installation.[6]

Operating principle

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The meter generates an electrical current and then supplies it to the measuring electrodes.[7] The potential difference between the two electrodes gives information about the value of soil resistance.

Analog grounding resistance tester

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The analog grounding resistance tester is realized by four main blocks DC generator, rectifier, current and potential coil. The deflection of the pointer of the analog screen depends on the ratio of the voltage of pressure coil to the current of the current coil. [8]

Digital grounding resistance tester

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The digital grounding resistance tester is realized by digital electronic blocks as Timers, voltage regulators, and digital display. The ranges are changed with multiturn trimpot.[9]

Main characteristics

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When measuring earth resistance with an instrument, it is important to know some of its basic characteristics in order to accurately measure the soil resistance and to properly size the grounding installation. Most importantly, the range of resistance the device measures. Usually the range is three or four degrees. The soil moisture at which the appliance operates is another important parameter. If the instrument cannot operate at a certain humidity, then the measurement may differ significantly from the real value of soil resistance. Comparison analog and digital grounding resistance testers.[10] The main characteristics:

Unit operate at ambient temperatures relative humidity measuring ranges error instrument Grounding resistance tester M416 analog [11] -25 °C to +60 °C 95% 1(0.1 Ohm - 10 Ohm);

2(0.5 Ohm - 50 Ohm);

3(2 ohms - 200 ohms);

4(10 Ohm - 1000 ohms)

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± (5 + (N/Rx-1)) Grounding resistance tester UNI-T UT521 digital -25 °C to +60 °C 95%

1(0 Ohm - 20 Ohm);

2(0 Ohm - 200 Ohm);

3(0 ohms - 2000 ohms);

± (2 + (N/Rx-1)) Grounding resistance tester Fluke 1621 digital -25 °C to +70 °C 98%

1(0 Ohm - 20 Ohm);

2(0 Ohm - 200 Ohm);

3(0 ohms - 2000 ohms);

± (2 + (N/Rx-1))

Standardisation

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• IEEE 81-2012
• ГОСТ 22261-94

References

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• Earth/ground clamp for measuring earth resistance of electrical installations Philippe Legros

Soil resistivity tester for sale online, used for measuring ground resistance, soil resistivity, and ground voltage on-site. It is also a ground resistance tester, widely used in electric power, telecommunications, meteorology, oil field, construction, lightning protection and industrial electrical equipment. The digital resistance tester has a 0~30kΩ large range and can store 300 sets of data at the same time, which can be monitored online in real-time through monitoring software.

The double-clamp ground resistance tester is equipped with a 0~300kΩ range, large LCD display, a large-capacity rechargeable lithium battery pack, and a USB interface for data upload. Multi earth resistance tester is specially designed for measuring ground resistance, DC resistance, soil resistivity, ground current, and ground voltage. Several testing methods for selection. The waterproof shell is suitable for use in outdoor construction sites.

Digital earth resistance tester is equipped with a sound and light alarm, data storage and data retention function and 0.01Ω-200Ω measurement range. Clamp-on ground resistance tester is widely used in grounding resistance measurement and loop resistance measurement of electric power, telecommunications, meteorology, oil field, construction and industrial electrical equipment.

Buy a high precision earth resistance tester online. It is available with 0.000mA~20A current range, 0~200kΩ measurement range, 5-inch color LCD screen, USB interface charging port, storage function and clock function. Clamp ground resistance tester is suitable for measuring grounding resistance, loop resistance, soil resistivity, voltage to ground, and grounding down conductor leakage current.

The digital earth resistance tester with a 0.010Ω~2000Ω range uses 3-wire or 2-wire method to measure ground resistance. The shell of the ground resistance tester is protected by a waterproof case, especially suitable for use in outdoor construction sites. Store 400 sets of data at the same time, alarm value setting and alarm indication and historical data reading, consulting, saving, reporting, and printing functions are available.

Digital earth resistance tester is designed for measuring earth resistance and loop resistance of electric power, telecommunication, meteorology, oil field, building and industrial electrical equipment. Clamp-on ground resistance tester features a 0.01Ω~1200Ω measurement range, 0.00mA ~ 20.0A current range and a sound and light alarm, data storage and retention function.

Clamp-on earth resistance tester with large LCD display performs grounding resistance testing accurately and simply, measuring range from 0.01Ω to 1000Ω. sisco ground resistance meter is suitable for grounding system measurement of electric power system, telecommunication, meteorology, oil field and building.

Digital earth resistance tester for sale online. It is an insulation resistance tester with an 0.010Ω~1000Ω measure range, audible and visible alarm, data memory and data hold. Non-contact measurement is safe and fast. When using a ground resistance tester to measure the loop earth system, there is no need to disconnect the grounding down leads and auxiliary grounding electrode, saving time and more effect.

The clamp earth resistance tester is designed for ground resistance measurement, loop resistance measurement, grounding down leads leakage current measurement and judging ground fault. Handheld ground earth resistance tester provides a 0.01Ω~1500Ω measurement range, 0.00mA~40.0A current range, sound and light alarm, data storage and data retention function, which is your better choice to measure your ground resistance.

Clamp earth resistance tester is used to measure ground resistance, soil resistivity, ground current and ground voltage on site. Ground test with clamp meter method, two-wire method, three-wire method, and four-wire method for selection. Digital resistance tester has a 0~20kΩ measure range, 5-inch color LCD screen, USB interface charging port, storage function, clock function, and automatically stores 500 groups.

Earth resistance tester is an instrument for measuring the grounding resistance value and soil resistivity of the grounding device of electrical equipment. The clamp-on earth resistance tester can measure the connection resistance of any looped system without using an auxiliary ground rod or interrupting the grounding of the equipment under test. As long as the ground wire or ground rod is clamped with the clamp head, the ground resistance can be measured safely and quickly. It can also be applied to multiple parallel grounding systems.

sisco.com offers you ground resistance testers for measuring resistance in the range of 0.00Ω~30kΩ. Digital earth resistance tester is light and compact, easy to operate, accurate and reliable, designed for measuring earth resistance and loop resistance of electric power, telecommunication, meteorology, oil field, building and industrial electrical equipment. 

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