Other requirements for anti-static work area
1 Electrical equipment, tools, soldering irons, solder boxes, wave soldering equipment, soldering irons, soldering equipment should be hard grounded. The resistance value from the soldering iron tip to ground should be less than 2 Ω to increase the voltage by less than 15V. Other electrical equipment in contact with the ESDS device should also be grounded. The solder pipette should be protected with an ESDS device such as metallization or anti-static. For the insulation of hand tools, static electricity generation should be carried out and, if necessary, treated with antistatic agents on a regular basis. Small hand tools that are often held in hand often protect against ESD by accumulating moisture from the skin. 2 The test equipment shall have all exposed metal surfaces, the electrical connection being through the grounding plug to the power supply system of the test equipment, or other hard ground. For personal safety against electrical shock, the test equipment should not be placed on the surface of the conductive workbench as it may cause the surface to be hard grounded. Depending on the size of the nearby voltage source, the experimental equipment can be placed on a large electrical resistance antistatic material. In the electrical socket used to power the laboratory equipment, a ground fault circuit breaker should be used as an additional personal safety measure. 3 The thermostat should be equipped with a grounding baffle to dissipate the charge in the circulating air. On the other hand, ionized air should be used in the incubator to dissipate static charges due to air flow, or shields can be used to divert charged air to the ESDS device. It should be noted that in a CO2 cooling tank, CO2 vapor can generate a large amount of electrostatic charge, and the parts to be tested in the incubator should be placed in the ESDS device protection transport hopper or placed in the tray on the grounded metal frame of the incubator. . The thermal stability of the ESDS device protection material used in the incubator should be adapted to the entire test temperature range. 4 Spray, Cleaning, Paint, and Sandblasting Equipment When spraying, cleaning, painting, and grit blasting ESDS devices, an ionizing air compressor, conductive solvent, or ionizing nozzle suitable for preventing an increase in static charge in the working area should be used. Wet spray conductive or antistatic treatment should be used. Instead of dry blasting, a net mortar with a maximum volume resistivity of 500 Ω·cm is used. A low resistivity solvent such as ethanol mixed with a normal cleaning solvent can reduce static electricity generation. 5 Wet air increases the surface conductivity by keeping the surface moist, helping to dissipate static charge. As the relative humidity decreases, a significant electrostatic voltage can be accumulated. It is apparent that it is desirable to have a relative humidity between 60% and 70% as long as it does not cause an increase in rust or other harmful effects, such as PWB delamination during welding. Where the high relative humidity level cannot be maintained, the ionized air is used to dissipate the electrostatic charge. Wet and dry bulb temperature and humidity meters should be used for humidity measurement, and the use of hair to publish disc hygrometers is often not accurate enough. 6 It is important to maintain high air cleanliness within the EPA area. In order to ensure product quality, it is necessary to take some air purification measures.
