First, the instrument Overview 
 Power system, large grounding resistance tester main power frequency high current measurement. In order to prevent frequency interference generated when the power grid, to improve the accuracy of the measurement results, insulation preventive test code requirements: power frequency current method of test current shall be not less than 30 amps. As a result, there have been many problems of bulky test equipment, the complexity of the testing process, testing personnel strength, test for a long time. 
 HDWR-5A of Ground Resistance Tester can be measured substation to (4Ω), fire and water power plants, microwave stations (10Ω), a lightning rod (10Ω) and models, using a new type of variable frequency AC power, and uses a computer processing control and signal processing, and other measures to solve the interference problem in the testing process, simplifying the test procedure to improve the precision and accuracy of test results, and greatly reduces the labor intensity of the testing personnel and testing costs. 
 Second, technical indicators 
 1, the instrument measuring range: 0 to 150Ω 
 2, Accuracy: 1% 
 Measuring the output current: AC <= 5A 
 4, measuring the output voltage: up to 400V ± 10% 
 Power supply: AC220V ± 10%, 50Hz 
 6, Weight: 30kg