Use a grounding resistance tester based on a single-arm bridge for measurement. For more details, you can search online for "grounding resistance tester".
Static Grounding Detection Method
A.0.1 Static grounding detection should be conducted when the object under test is not charged. This includes testing grounding systems, non-metallic materials, and antistatic products within the equipment.
A.0.2 Equipment grounding measurements must follow these regulations:
- The contact resistance and jumper resistance between metal parts of the equipment, as well as between the equipment and the dedicated grounding pole, can be measured using a standard multimeter.
- To measure the equipment's grounding resistance—including the contact resistance of the grounding plate and soil, and the flow resistance of the soil—use a ZC series grounding shaker. The distance between the grounding plate and current electrode should be 40 meters, while the distance between the voltage electrode and current electrode should be 20 meters.
- For non-metallic devices (such as non-metallic grounding components or insulating flanges), the resistance measurement method depends on the value: if it's less than 1 MΩ, use a standard multimeter or high-resistance meter; if it's 1 MΩ or higher, use a high-resistance meter rated at 500V or above, or a megohmmeter.
A.0.3 Conductivity measurement of non-metallic materials must meet the following requirements:
- Volume resistivity and surface resistivity of sheets and films:
- If the volume resistivity is ≥ 10ⶠΩ·m, refer to GB1410-78 for measurement. Use high-resistance meters like ZC36 or ZC43. Sample size: 100 × 100 mm square or φ100 mm circle.
- If the volume resistivity is < 10ⶠΩ·m, follow GB2439-81. Ensure the electrometer and ammeter have an input impedance > 10¹² Ω. Sample size: 70–150 mm long and 10–150 mm wide.
- Fiber leakage resistance: Measure according to FJ551-85. Sample weight: 2 ± 0.1g. Use a fiber leakage resistance tester based on RC charge-discharge principles.
- Conductivity of light petroleum products: Follow GB6539-86. Use an oil conductivity tester with sample oil > 1L.
A.0.4 The conductive performance of antistatic products must meet the following standards:
- Anti-static shoes and conductive shoes resistance: Measure according to GB4386-84. If R ≥ 1.5×10ⵠΩ, use 500 ± 25 V; if R < 1.5×10ⵠΩ, use 100 ± 5 V. The test power should not exceed 3 W.
- Grounding, carpets, and floor coverings: Use two special electrodes (φ60 ± 2 mm, weight 2 ± 0.2 kg, brass chrome-plated). Electrode spacing: 1 m. Place conductive sponge (φ60 mm, 5–6 mm thick, volume resistivity 0.1–1 Ω·m) under non-flexible ground. Use an insulation resistance tester with DC open-circuit voltage of 500V and short-circuit current of 5 mA.
These procedures ensure accurate and reliable static and grounding measurements in various industrial and technical applications.
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