Feature 1It can test the grounding resistance of various grounding systems, including power systems, electrical equipment, lightning rods, and lowresistance conductor resistance and AC voltage tests. 2More complete functions, higher accuracy, more convenient operation, more reliable, and more suitable for outdoor use with dustproof and moistureproof structure. 3The circuit, structure and technology of the traditional grounding resistance tester have been improved, and the new design is both beautiful and practical. 4Contains testing wires and necessary matching accessories, which can provide much convenience for your using. 5LCD digital display, overvoltage protection, data retention, low battery warning, outdoor dustproof and moistureproof.Item Type: Earth Ground Resistance MeterMaterial: PlasticHost Size: Approx. 150x150x70mm/5.9x3.93x2.76inBattery Model: 6 x 1. 5V(R6AA) battery1 x 12V(23A) batteryBattery is not included in the accessoryFunctions: Overvoltage protectionData holdlow battery warningHigh accuracy LCD digital display screenOutdoor dust wet proofResolution: 0.01 ohmData Hold: YesWorking LED Indicator: YesFunction Symbol Display: YesSpecification:1. Measuring Range Of Earth Resistance: 0-2000. 0/20/200/2000 ohm (2%+3)2. Measuring Range Of Earth Voltage: 0-30V(3%+5)3. LED green light indicates normal operating mode.4. 31/2 digit LCD display for more direct and convenient reading.5. Low Battery Warning: on LCD indicates deficiency of 12V battery. LED red lighting off indicates deficiency of 1.5V battery.6. Response Time: Measure earth resistance, about 5 seconds. Measure earth voltage, about 2 seconds.7.Withstand Voltage: AC 500V, 1 minute between circuit and outer casing.8. Overload Protection: On earth voltage, can withstand 300V AC 1 minute . on earth resistance, can withstand 200V AC 10 seconds .9. Working Environment: Working Temperature: 0-40 relative humidity < 80%Storage Temperature: - 10-50 relative humidity < 85%Ensured Accurate Temperature: 235relative humidity < 80%Operation Instruction: a. Battery Voltage Inspectionb. 3-wire Earth Resistance TestNOTE: Maximum 50V voltage may be generated between E-C or E-P terminals when testing earth resistancePlease do not touch testing lead to avoid electric shock.Please make sure testing wire plug insert in testingterminal thoroughly before testing since loose connection may cause error in testing result. 1) Testing Wire ConnectionAs shown in picture below, punch assistant earth bar P1and C1 in earth 5 to10 meters distant from tested earth substance; connect green wire to terminal E, yellow wire to terminal P and red wire to terminal C2) Inspection of Power Supply and Wire Connection Press Test/Stop , POWER light off indicates insufficient 1.5V battery. Please replace it.OK light on indicates normal connecting of lead and E, C terminals, and auxiliary earth resistance is within permitted range. If light is off, check the lead connecting E and C terminals or change the position ofearth bar, or water the land to lower auxiliary earth resistance to a proper level. Check breakage by short circuit of spring clamps of red and green lead .3) Earth Voltage MeasurementPlease turn the range select switch to earth voltage.Make sure the voltage value below 10V since error may occur to measuring value of earth voltage if the voltage value above 10V. At this point, one can break the power supply of tested earth electrode equipment to lower earth voltage and then measure the value4) Earth Resistance MeasurementFirst please press Test/Stop beginning from2000 .If the shown value is too small, switch to 200/20 and the shown value here is namely the tested earth resistance value. Note: Make sure connecting wires separated during wire connecting since testing when testing leads wind about with each other may encounter mutual inductance to affect reading. The auxiliary earthresistance value may be too big and error may occur to show value. Make sure auxiliary earth bar P and C into wet land and complete contact of connecting parts.c. Simple Earth Resistance Measurement The method is designed for places where auxiliary earth bar cannot be punched. Use a earth electrode with quite small earth resistance like metal water pipe, common earth electrode of commercial electric power system, earth end of building, etc to substitute auxiliary earth bar P and C. 1)Testing Wire ConnectionNOTE: Be careful of electric shock when using commercial electric system earth method for test.Please do not use this tester to measure supply voltage. 2)Earth Voltage Measurement Please turn the range select switch to earth voltage.Make sure the voltage value below 10V since error may occur to measuring value of earth voltage if the voltage value above 10V. At this point, one can break the power supply of tested earth electrode equipment to lower earth voltage and then measure the value. 3)Earth Resistance Measurement First please press Test/Stop beginning from 2000 . If the shown valu