ETCR3740 Equipotential Connection Reistance On-line Tester also known as DC Resistance On-Line Tester, is used for on-line measurement of the connection resistance between metal components and between the ground connection conductors of the ground grid. The tester is widely used in industrial and mining enterprises, building monitoring and supervision companies, construction units, lightning protection companies, power departments, ship and locomotive factories, etc.

ETCR3740 Equipotential Connection Resistance On-Line Tester adopts microprocessor technology, 4-wire measurement method, which is safe, precise and reliable.   The tester provides 485 communication or GPRS communication mode.   Users can carry out secondary development, build a network, and realize remote Multi-point online monitoring, etc. according to the MODBUS communication protocol, The tester equip with a large-screen LCD display, which can set test parameters and view the present DC resistance value on site. The tester has the function of sound and light alarm, and the alarm threshold can be set. The tester is easy to install, safe and durable.