Electronic workshop anti-static ground line detection method
Electrostatic protection work in electronic production workshops is well known, but some factories may use anti-static products due to neglect of management. However, there is no regular detailed inspection. It is recommended to install static electricity. When the static electricity is grounded, it should be tested by the instrument, or you can ask the professional to make the measurement.
All anti-static grounding wires use 6 mm2 multi-strand copper core insulated wire. Each floor or appropriate section uses copper bars or 401 switches. The knives are connected with the main line to facilitate inspection and maintenance.
The anti-static cable should be well insulated from the equipment casing, workbench iron frame, work light frame, etc. to prevent short circuit, lap or broken connection.
In the "trunk end" of the segmented copper row or switch, another inspection line is provided. (1.5~2mm2 can be used). Each workshop has 2~3 checkpoints, which are fixed and clearly marked. Use grounding resistance tester (also called shaking table) 1) The resistance between each anti-static test point and anti-static ground wire is 5~15Ω, ideally should be 0Ω. However, the actual measured value is 2mm2 wire from the test point to the summing point resistance +6m m2, the sum of the wire from the summing point to the measured point resistance, this value is about 5-15Ω and basically unchanged, if the measurement result tends to infinity, If there is a broken wire for the anti-static ground wire or measuring wire, it should be repaired in time.
The resistance between the electrostatic grounding wire and the grounding wire of the device consists of the line resistance of the antistatic ground wire, the line resistance of the device ground wire, and the ground resistance between the two ground wires. However, due to the dryness and wetness of the ground between the two grounding lines, the influence of the ground current is very complicated, especially the current, the frequency in the direction and the direction of the moment are changing, and the measurement result is mainly determined, so it can only be measured by the pointer table, and Values from ten to several hundred to several hundred K are normal, only that there is no short circuit between the two places and no open circuit.
Based on the above test data, it can be judged whether the current anti-static ground wire of the workshop is working properly.