What is the difference between a DC resistance tester and a loop resistance tester?

1. The detection current is different

For loop resistance detection, the detection current should not be less than 100A, and the loop resistance or loop resistance can be directly measured at 100A, 200A, 300A, 400A, 500A or 600A.

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

2. The display is different

The loop resistance tester is an LCD screen display, a fast label printer, and can also be stored on the instrument.

The DC resistance tester is composed of two parts: constant current power supply and working voltage signal detection, with a five-digit digital display.

3. The main purpose is different

The grounding wire resistance of the loop resistance tester can be directly measured and the grounding wire resistance of various grounding management systems can also be used for the measurement of our general low resistance resistors. The four-terminal button can also improve the measurement of soil resistivity. Digital grounding protection device resistance tester This tester is professionally used to control, measure and analyze the grounding wire resistance value of various building electrical engineering equipment, lightning protection grounding and other grounding systems.

The DC resistance tester is widely used in electric power, scientific research, national defense, hospital clinics, processing plants, and universities.

4. The principle is different

The loop resistance tester generally uses a DC double-arm bridge to measure the loop resistance of the disconnector. However, when using a double-arm bridge to measure the resistance of the isolation switch's conductivity loop, because the double-arm bridge measurement circuit is based on a weak current, it is impossible to remove the relatively large oxide film of the resistor, and the measured resistor The measuring range is too large.

The DC resistance tester is an intermediate control module, which adds a stable and high-precision current to the external load according to the operation of the DC power supply, and then solves the obtained data information (including detection of operating voltage, current detection, etc.) to obtain a specific resistance value .

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