Electrostatic testing equipment is an important part of electrostatic protection
I often hear some foundry companies come to consult the instrument and say that our company is for a large company. What brand and model do they want our company to use to detect electrostatic indicators? Why do the major manufacturers require a specific model, that is, Because the accuracy of some branded instruments is still trustworthy, the direction of rectification is clear after the measurement results are obtained, and it is clear at a glance whether the electrostatic protection is in place.
The anti-static products produced must be tested for a number of static indicators. In order to ensure the quality of the products, the electrostatic protection must be implemented in accordance with the standards required by the national standard. The requirements of anti-static technical indicators in the manufacture of electronic products are not only for the use There are requirements for the resistance value of electrostatic products, and there are also standards for measuring the static voltage generated by the product in the circulation process. Surface resistance, volume resistance, friction voltage, grounding system resistance, time required for electrostatic elimination equipment and balance are all Strict requirements, that index is not up to standard, and the electrostatic protection is all zeroed. From this point, it can prove how important the detection index is. Everyone knows that any technical index measured is a guide to what we should do. Or how to improve product quality or working environment to meet the requirements of electrostatic standards.
Reference value of anti-static technical indicators for electronic manufacturing industry:
1. The grounding resistance of the anti-static ground electrode is less than 10Ω.
2. Anti-static floor or floor mat: surface resistance value 105-109Ω, friction voltage <100V.
3. Anti-static wall: resistance value 5×104-109Ω.
4. Anti-static workbench mat: surface resistance value 105-109Ω; friction voltage <100V; resistance to ground system 105-109Ω.
5. The resistance of the anti-static work chair facing the casters is 105-109Ω.
6. The friction voltage of anti-static work clothes, hats and gloves is less than 300V; the friction voltage of shoe soles is less than 100V. The surface resistance is 105-109Ω.
7. The resistance of the connecting cable of the anti-static wrist strap is 1MΩ; when the wrist strap is worn, the system resistance is 750KΩ-10.5MΩ. The resistance of the heel strap (shoe harness) system is 105-108Ω.
8. The resistance of the logistics vehicle platform facing the wheel system is 105-109Ω.
9. The surface resistance value of material box, turnover box, PCB rack and other logistics transmission equipment is 103-109Ω, and the friction voltage is less than 100V.
10. The friction voltage of packaging bags and boxes is less than 100V.
11. The overall resistance of the human body is 105-109Ω.
In combination with the above-mentioned static electricity standards, these parameters are measured by all static electricity detection instruments. If the accuracy of the instrument is not enough, the measured data will be affected, especially for some customers who have high requirements for static protection. Conduct an evaluation of the production environment and production line electrostatic products, and make corrections or replace electrostatic consumables if they fail to meet the requirements.