1、 Preparation before useEquipment appearance and oil level inspectionClean the surface dirt of the transformer, check if the oil tank leaks oil, and confirm that the oil level is within the normal range. If the oil level is insufficient, it is necessary to replenish the standard No. 25 transformer

1. Precise low resistance measurementSpecially designed for measuring small resistors in the range of 1 μ Ω~1 Ω (conventional multimeters have insufficient accuracy)2. Typical applications:Contact resistance of switch/relay contacts (＜ 100 μ Ω)• Solder joint/connector conductivity resistance

1. Ground ResistanceDefinition: The total resistance between the grounding device and the earth, reflecting the ability of current to diffuse from the grounding body to the surrounding soil.Measurement principle: By injecting a test current (usually AC, to avoid polarization effects) into the ground

Environmental conditionsTemperature: The typical working environment temperature is -10 ℃ to+40 ℃ to avoid extreme high or low temperatures affecting equipment stability.Humidity: Relative humidity ≤ 85%, to prevent electrical components from getting damp or short circuiting.Ventilation: Use in a