DET 20 is a conventional 3 ½ digits LCD designed to measure earth resistance, soil resistivity & earth voltage. It has a unique RSR technology in which the measurement reading remains constant even when the battery voltage drops. DET 20 has a 128Hz test frequency that eliminates the harmonics interference and has a rechargeable long-life battery which reduces costs. Earth resistance is measured by three wires & soil resistivity is measured by four-wire measurement techniques. This meter is shockproof and dustproof and comes with an ABS casing for heavy duty application. DET 20 is type tested as per IS 9223.

Features:

• 3 ½ digits LCD display with a maximum reading of up to 1999
• 3 terminal and 4 terminal measurement method
• Earth resistance range from 0.01 Ohm to 1999 Ohm
• 4 soil resistivity measurement
• Rechargeable internal Ni-MH battery
• Earth measurement voltage of up to 200V
• Ratiometric synchronous rectification
• ±1.5% of reading ±5 digits valid from 10% to 95% of the range.

Application:

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
• Therefor 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.

The methods of measuring and testing the ground resistance and soil resistivity are as follows:

• 3 pole method used for earth resistance testing
• 4 pole method used for soil resistivity testing.

Typically used for:

• Substation earth testing
• To test telecom tower grounding and railways earthing
• To test the quality of grounding without disconnecting the ground rod under test 
• Earth resistance of the grid

Technical Data:

Earth Resistance Ranges	0.01 Ohm to 19.99 Ohm 0.1 Ohm to 199.9 Ohm 1 Ohm to 1999 Ohm
Test Current	20 Ohm Range: 10mA AC RMS 200 Ohm Range: 1mA AC RMS 2000 Ohm Range: 100µA AC RMS Test current is generally constant throughout the range
Interference	Interference voltage of 20V ±5% peak to peak, 50Hz in the potential circuit will have a maximum effect ±1% on the reading obtained from the 20 Ohm to 2KOhm range.
Influence of Temperature	<±0.2% per °C over the temperature range 0-20°C and 28-55°C.
Humidity	Operating: 95% RH non condensing max at 40 °C Storage: 93% RH non condensing max at 55 °C Flash Test: 2KV AC
Voltage withstand	In the event of a system fault, the instrument will withstand 240V AC, applied between any two terminals.

Package Content:

• 4nos. Spike of 10mm dis, 450mm long
• 10m, 20m, 30m & 40m of measurement cable on a winder as standard.
• Battery Charger
• Hammer
• Carrying bag
• Instruction Manual

Please Note that Product may differ eg. colour, size from the product Image displayed on website. Kindly check the specifications provided to make better purchase decision. M.R.P Prices and specifications are subject to change without notice.