1. Application Range: This instrument is suitable for measuring the grounding resistance of various devices and the low resistance values of conductors in sectors such as power, telecommunications, railways, petroleum, chemical, communications, and mining. It can also measure soil resistivity and ground voltage.

2. Working Principle: The instrument operates by converting DC to AC low-frequency constant current using an internal DC/AC converter. This current flows through an auxiliary grounding electrode (C) and the object under test (E) to form a circuit, generating an AC voltage drop across the object. This voltage drop is then transmitted via the auxiliary grounding electrode (P) to an AC amplifier, amplified, rectified, and finally displayed on the meter. Using the range selection switch, three different measurement ranges are available: 0-2Ω, 0-20Ω, 0-200Ω, and 0-2000Ω.

Applied DC/AC conversion technology, integrating both three-terminal and four-terminal measurement modes into one device, with dual AC/DC power supply capability.

Adopting synchronous tracking detection method with phase-locked loop and switched-capacitor filters, resulting in strong anti-interference capability.

Eliminated traditional manual hand-crank generator method, requiring no manual work effort.

No need for manual balance adjustment, intuitive panel touch key operation with LCD digital display makes measurement very convenient and rapid, eliminating visual errors of pointer-type instruments.

Allows for very high auxiliary grounding resistance values, better ensuring measurement accuracy with high resolution.

In addition to testing grounding resistance, it can also measure low-voltage conductor resistance values, soil resistivity, and AC ground voltage.