The difference between loop resistance tester and DC resistance tester

1. Different test currents

For loop resistance test, the test current shall not be less than 100 A. Loop resistance or contact resistance can be directly measured under the condition of 100A, 200A, 300A, 400A, 500A or 600A current.

The measurement current of the DC resistance tester is usually: 1A, 3A, 5A, 10A, 20A, 30A and other different measurement positions.

Loop Resistance Tester

2. Different Displays

The loop resistance tester (also called contact resistance tester) is directly displayed on the LCD screen, high-speed thermal printer, and can also be saved on the instrument.

The DC resistance tester consists of a constant current power supply and voltage signal detection, and has a five-digit LCD digital display.

DC resistance tester

3. Different uses

The ground resistance of the loop resistance tester is suitable for directly measuring the ground resistance of various grounding equipment. It can also be used for general low resistance measurement. The four-terminal button can also measure soil resistivity. Digital ground resistance tester This tester is specially used to measure the ground resistance of various electrical equipment, lightning rods and other grounding equipment.

DC resistance tester is widely used in post and telecommunications, scientific research, military, hospitals, factories, schools, etc.

4. Different working principles

The loop resistance tester usually uses a DC double-arm bridge to measure the contact resistance of the circuit breaker. However, when using a double-arm bridge to measure the resistance of the conductive circuit of the circuit breaker, it is difficult to eliminate the oxide film with large resistance because a weak current is measured through the double-arm bridge measurement circuit. The resistance value is too large.

The DC resistance tester is a central control unit that applies a constant, high-precision current to the external load to be tested by controlling a constant current source, and then processes the obtained data (including test voltage, test current, etc.).