CEM DT-9399 Earth Ground Clamp Meter [0.025 Ω – 1500 Ω], Wireless (PC / APP)

high-precision clamp-on grounding resistance meter offers advantages such as high accuracy and the ability to quickly, safely, and accurately measure grounding loop resistance without disconnecting the grounding lead or using auxiliary electrodes

It can directly clamp onto the live grounding lead for real-time detection, and with its unique filter frequency anti-interference technology, it can maintain high-precision measurement even during the opening and closing of the circuit breaker.

Safety:

IEC61010-1 CAT IV 600V / CAT III 1000V
UL, CSA, and TÜV listed for maximum safety and global compliance

Applications:

-- Electrical substations
-- Cell towers
-- Data centers
-- Industrial plants
-- Lightning protection systems, The quality of the equipment grounding wire connection.
-- Regularly inspect and maintain the grounding system to identify high-resistance faults caused by corrosion or loosening.
-- solar panel installations for measurement of grounding resistance.

For example, during the annual inspection of a 500kV substation using DT-9399, an abnormal change in the grounding resistance of the surge arrester for main transformer  was discovered. Excavation confirmed that the copper-aluminum transition clamp was corroded by sulfidation. Timely replacement prevented a lightning strike and explosion accident.