Earth resistance meters review

Also known as ground resistance meters, these devices are used to measure and test the grounding for ensuring the safety of the workers doing operations on that particular ground. Simplifying the concept, let us take the example of a newly constructed house. As we need to electrically equip the house with switches, meter and change over, there has to be a good relationship between the earth and the electrodes or electricity points connected to it. Henceforth, to ensure sufficient electrical continuity between conducting apparatus and earth, testing of Earth resistance becomes essential. To understand the working of this meter, meaning of important terms associated with the subject matter is essential to be looked upon.

Earth resistance

Earth resistance is the resistance between boundless earth and earth electrode which is dependent mainly on three factors:

1. The resistance of the electrode imbedded inside,
2. The contact resistance between surface of the electrode and the soil,
3. The resistivity of the soil occupying the area between the electrode and earth
Generally, only soil resistivity is checked because first two factors are relatively less important than the third one.

As soil resistivity is relatively important, its’ mainly dependent on factors like:

It is important to note here that soil resistivity can be fairly improved by filling the surrounding of electrode with soluble like common salt (nacl) which is used the most for the purpose. Also, when it comes to for installing the Earthing system, Moist soil types like wet loamy soil or clay soil are preferred as against dry soils like soil with gravel chalk, limestone content or dry sand. Stony grounds are suggested to be avoided.


Earth Resistance Meter/ Ground Resistance Testers

Ground resistance testers/meters are devices that are used to check the resistance of ground towards the flow of current and to test electrical grounding systems. It assures optimum electrical continuity between conducting objects and earth. An equipment is grounded deep inside to ensure improved soil resistivity and then is permanently connected to earth through a ground connection with a genuinely lower impedance and a fair current- carrying capacity so as to avoid a fatal voltage buildup that can show up by a ground fault current.

There are a number of ground testers designed for various purposes and they deliver several important functions as follows:

Another essential functions can be:


Amperis Earth Resistance and Resistivity Meters

Earth Resistance and Resistivity Meters AMRU-30

resistivity of the ground meter

Earth Resistance and Resistivity Meters AMRU-21

Perform resistance measurements

Multifunction electrical Installations Meter AMPI-525
   Tailor made for Short-circuit loop measurement comprising:

Electrical Installations Meter

Earth Resistance and Resistivity Meter and Multifunctional suitcase AMPI-520

Multifunction electrical Installations Meter

Earth Resistance and Resistivity Meters AMRU 120
For Measuring:

measurament with 3-pole, 4-pole method

Earth Resistance and Resistivity Meters AMRU-200

2, 3 or 4 pole technical method



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