Common wrist strap grounding socket
The grounding system is not set up because the anti-static work surface can be vertically turned on. In recent years, anti-static workbench with vertical conduction as the main selling point has appeared on the market, which is characterized in that the substrate of the work surface itself can be vertically turned on. Many manufacturers claim that no additional grounding is required, and only the steel of the workbench The bracket can be used to discharge electrostatic charges to the ground. And no matter whether the mesa can really achieve vertical conduction, the designed electrostatic discharge path is problematic. The first is that there are many links and long paths, which are unfavorable for the rapid discharge of electrostatic charges. Occasionally, poor contact will cause grounding failure. Secondly, the antistatic ground itself is a static dissipative material, and the conduction of electrostatic charge is very slow, and it is unreliable as a venting route.
Accessories such as the upper partition, drawers and moving cabinets of the workbench are not grounded at all. It is generally believed that these accessories do not place the product directly, so there is no need to ground, but some customers use these areas to place products, so these places must also be considered for grounding.
The grounding wires of multiple anti-static workbench are connected in series or not.
These seemingly small defects can cause the antistatic workbench to lose its antistatic performance, so that the electrostatic sensitive device and its assembled products may be seriously damaged by electrostatic discharge and noise.
Based on the above problems, how to effectively, quickly and reliably ground?
In fact, all kinds of different standards have been stated, summed up the following three principles: the first must be soft grounding. The so-called soft ground is connected to the earth electrode through a resistor sufficient to limit the flow of current through the human body to a safe value (<5 mA). The grounding wires of the second plurality of anti-static workbench shall not be connected in series, and shall be connected to the grounding copper busbars. The third grounding cable should be intermediate without a joint and have sufficient mechanical strength.