DET-20A is a conventional type 4½ digit LCD display which is designed to measure Earth Resistance, Soil Resistivity & Earth Voltage. It has a unique RSR technology in which even at the drop of battery voltage the measurement reading remain constant. DET-20A has 128Hz test frequency which eliminates the harmonics interference and has replaceable Alkaline battery which provides on site flexibility. Earth resistance is measured by three wires & Soil Resistivity is measured by four wire measurement techniques. This meter is shock proof, drop and dust proof. It has ABS casing which is useful for heavy duty. DET-20A is designed as per IS 9223.

Applications

The integrity of the grounding system is very important in an electrical power system for the following reasons:

• To maintain a reference point of potential (ground) for equipment and personnel safety.
• To provide a discharge point for travelling waves due to lightning.
• To prevent excessive high voltage due to induced voltages on the power system.

Therefore to maintain sufficiently low resistance values of grounding systems, their periodic testing is required. The testing involves measurement to ensure that they do not exceed design limits. The measurement of ground resistances may only be accomplished with specially designed test equipment. The most common method for measuring ground resistance uses the fall-of-potential principle of alternating current (AC) at higher frequency circulating between an auxiliary electrode and the ground electrode under test; the reading will be given in ohms and represents the resistance of the ground electrode to the surrounding earth. Soil Resistivity is also the key factor that determines what the resistance of a grounding electrode will be, and to what depth it must be driven to obtain low ground resistance. The resistivity of the soil varies widely throughout the world and changes seasonally. Soil Resistivity is determined largely by its content of electrolytes, consisting of moisture, minerals, and dissolved salts. A dry soil has high resistivity if it contains no soluble salts. It figures has a direct impact on the overall sub-station resistance and how much earth electrode is required to achieve the desired values. Lower the resistivity, fewer the electrodes required to achieve the desired earth resistance value. Hence the Soil Resistivity is also important test.

"Available on EnvMart, these Resistance Meters are designed for precise measurement of electrical resistance in circuits and components. Motwane Resistance Meters deliver high accuracy and reliability, making them essential for electrical testing, maintenance, and quality control applications."