Earth resistance detecting instrument

Use: to measure earth resistance value of kinds of devices in power, communications, rails, factories, mines and other departments. features 1. structure: high strong strength aluminum alloy as the case Circuit: lock phase ring synchronization tracking wave inspecting method to prevent power frequency and radio frequency interference, equipped with switch electric capacity filter to make detector be more interference resistance competent. 2. DC/AC shifting technology changes DC into low frequency constant AC, convenient for measuring. 3. Non-human adjusting balanced. LCD display. If loop is obstructed and meter head displays 1, symbol of overflowing, conforming to normal measuring habit. 4.Measure earth resistance, low resistance conduct resistance, soil resistance ratio and AC earth voltage. technique specification: 1, using environment Environment temperature: 0°C +45°C Relative humidity: ≤85%RH 2, measuring range and constant value( valid value) Resistance: 0 2Ω(10mA),2 20Ω(10mA),20 200Ω(1mA). Remark: capacity can be extended to 2000Ω according to requirement. Voltage: AC 0 20V 3, precision and resolution Precision: 0 0.2Ω≤±3%±1d 0.2Ω 200Ω≤±1.5%±1d 1 20V≤±3%±1d resolution: 0.001Ω,0.01Ω,0.1Ω,0.01V 4, measuring error produced by auxiliary earth resistance and earth voltage a. RC, auxiliary earth resistance allowed ( between C1 and C2)< 1.8KΩ RP(between P1and P2)<40KΩ error≤±5% b.earth voltage allowed ≤5V( power frequency valid value) error≤±5% 5, power supply and power Maximum power loss: ≤2W DC: 8×1.5V(AA,R6) battery, AC: 220V/50Hz Volume: 220mm×200mm×105mm Weight: ≤1.4kg