Soil resistivity changes with the seasons and different spring and summer days of rain, the soil wet ground resistance is easier to achieve, the dry soil moisture in autumn and winter, the grounding resistance is likely to exceed the prescribed value, for the record in order to save the raw data, so that future well documented. Compliance with ISO2000 quality management system. Test grounding resistance can design their own forms, ground resistance testing packaging companies, mains LED lights, enterprises have to do, as long as all kinds of device names to fill in the form, measure the grounding resistance of the device records documented test signatures can be archived.
Human body electrostatic damage to the mains LED lights is a lot of work should wear anti-static clothing, equipped with electrostatic rings and electrostatic ring should be grounded, there is a need to ground the static ring of anti-static effect is not good, it is recommended not to use the strap of the product, if the staff violation of rules, you should receive the appropriate warning education, but also played the role of the notices of others. Body with static electricity, wear different fabrics and clothes, and the people's physique, autumn and winter night, we undress it is easy to see the clothes between the discharge phenomenon, and this electrostatic discharge voltage, there kV.
The silicon carbide substrate chip ESD only 1100 volts, the sapphire substrate chip ESD value is even lower, only 500-600 volts. A good chip or led high bay lights, if we hand-pick (the body without any protective measures), the results can imagine, chip or LED will be varying degrees of damage, and sometimes a good device through our hands inexplicable bad, this is the electrostatic blame.