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CIE/222M
Analog Earth Tester — Metal Body
Hand-driven analog earth tester — 3-terminal (earth resistance) and 4-terminal (earth resistance + soil resistivity). ±5% accuracy per IS: 9223/1979.
— Earth Resistance · Analog & Digital
Earth Resistance Testers
Analog and digital earth resistance testers for 3-terminal earth resistance and soil resistivity measurement. Includes hand-driven analog instruments supplied as a complete kit, and digital models with direct numerical readout.
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DET-2000
Digital Earth Resistance Tester
Rugged ABS-bodied digital earth resistance tester — 4-terminal, rechargeable Ni-Cd battery. Dual and triple range.
Frequently Asked Questions
What is earth resistance and why must it be tested?
Earth resistance is the resistance between an earthing electrode and the true earth (remote earth). Low earth resistance is mandatory at every electrical installation to ensure that fault currents flow safely to earth, protecting personnel from electric shock and equipment from damage. Indian Electricity Rules and IS 3043 specify maximum earth resistance values — typically less than 1 ohm for power stations and less than 10 ohms for domestic installations.
What is the difference between 3-terminal and 4-terminal earth testing?
3-terminal earth testing (fall-of-potential method) measures the resistance of a single earth electrode by driving two auxiliary stakes and measuring the voltage drop. 4-terminal Wenner method testing passes current through outer electrodes and measures voltage across inner electrodes to determine soil resistivity — used for designing earth grid systems at substations and large installations.
Which CIE earth tester should I use for substation testing?
The CIE/222M analog earth tester supports both 3-terminal earth resistance and 4-terminal soil resistivity testing and is supplied as a complete kit with stakes, wires, carrying bag, and hammer. For digital readout and higher accuracy, the DET-2000 digital earth tester provides direct numerical display and supports 4-terminal measurement for soil resistivity surveys used in substation earth grid design.
About Earth Resistance Testers
Earth resistance testing is mandatory at every electrical installation — from domestic earthing systems to substation earth grids — to ensure personnel safety and equipment protection. CIE manufactures both analog and digital earth resistance testers for a wide range of applications.
The CIE/222M is an analog, hand-driven earth tester supplied as a complete kit with earth spikes, wire spools, a carrying bag, and a hammer — everything needed for a 3-terminal earth resistance measurement in the field. It also supports 4-terminal Wenner method soil resistivity measurement, making it suitable for substation earth grid design. The DET-2000 is the digital companion: a 4-terminal digital earth resistance tester with direct numerical readout, eliminating the parallax-reading uncertainty of the analog instrument.
Earth testers are used by electrical contractors, PWD departments, power utilities, railways, telecom companies, data centre operators, and industrial facilities across India. CIE earth testers are supplied to customers in Kolkata, Howrah, Bhubaneswar, Rourkela, Cuttack, Sambalpur (Odisha), Raipur (Chhattisgarh), Ranchi (Jharkhand), and across Eastern, Northern, Western, and Southern India. Proper earth resistance testing is required by the Indian Electricity Rules and IS 3043.
Cambridge Instruments & Engg. Co. (CIE) — manufacturer of precision electrical test and measurement instruments in Howrah, West Bengal, India, established 1963. Pan-India supply: Kolkata · Howrah · Bhubaneswar · Cuttack · Bangalore · Chennai · Hyderabad · Mumbai · Pune · Delhi · Ahmedabad · Lucknow · Chandigarh · Ranchi · Raipur · Visakhapatnam · Nagpur.
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