Earth resistance tester inspection service

With the aim of serving customers with the best after-sales services, EMIN Vietnam has established the Equipment Inspection - Calibration - Repair Service Center. With the support from numerous equipment manufacturers in the world, EMIN Vietnam possesses well-prepared calibrating instruments. EMIN Vietnam has successfully repaired and calibrated specialized equipment in Vietnam, ensuring the quickness, effectiveness and convenience for customers. Only few technical trading company in Vietnam do possess this technical capacity including EMIN Vietnam.

>> Earth Resistance Tester
Earth Resistance Tester: Electrical safety tester, determine the ground resistance value of the ground electrode or of the earth electrode system (ground system) by The 3 Pole (3 Pole) method uses a low frequency alternating current, commonly known as a rotor.

>> Other information
- Ground resistance measuring device has a resistance range in the range from 10-2 Ω to 104 Ω, with the highest (Class) level of 1.0 or the highest Accuracy of ± 1.0 %.
- According to regulations, measuring instruments of ground resistance are on the list of equipment required to be inspected by the General Department of Standards, Metrology and Quality of Vietnam and under the state management authority of the Ministry of Science and Technology. .

♦ Why requires Equipment Inspection ?
• To inspect the status of the device;
• Detect failures, predict failures to take measures to handle;
• Inspecting equipment is to obey the law well and to raise human awareness.

♦ Inspection conditions
When conducting inspection, the following conditions must be met:
• Ambient temperature: (23 ± 5) ° C
• The relative humidity of the air does not exceed (≤) 80% RH.

♦ Inspection Preparation
Before conducting an inspection, the following preparations must be performed:
• The UUT, together with the reference coils and the reference resistance boxes used for the inspection, shall be placed in the inspection environment for at least 2 hours (2 h) before the inspection is carried out;
• Clean the outside and the measuring terminals of the UUT.

♦ Equipment inspection process
When inspecting the ground resistance measuring device, the inspection  according to DLVN 143: 2012 includes the following steps:
> Step 1: External inspection:
> Step 2: Technical inspection:
> Step 3: Measurement testing:

♦ Term of inspection
The inspection cycle of the earth resistance measuring device is: 01 year.

For more information about Earth Resistance Tester:

For further information about calibration service, visit our website at:

For further information and calibration requirements, Please contact

Equipment Inspection - Calibration - Repair Service Center - EMIN Vietnam JSC 

 Adress: No 11, Hoang Cau Moi Street, Trung Liet Ward Dong Da District, Ha Noi City

Email: - Hotline: 097.251.2864 (Mr. Truong)