User manual LISTAESCAN ESD USER HANDBOOK

[. . . ] For example, the shock we feel when we touch a doorknob is an ESD. This natural occurrence is becoming a very hot topic in the field of electronics assembly due to the costly damage ESDs can cause to sensitive electronic equipment. What can a company do to prevent ESD Damage? A priority for any company with ESD concerns should be to implement an ESD program and appoint an ESD Coordinator. For assistance with the development of an ESD Control Program, refer to the ANSI/ESD standard s20. 20. It would be the objective of this program to reduce the potential for ESD related damage. [. . . ] between 10 Point to Point Resistance (or Surface Resistance) is the resistance measured between two points on a static control surface. According to EOS/ESD - S4. 1, using the apparatus listed above, the electrodes should be spaced ten inches apart and at least two inches from the edge of the surface. Surface Resistivity is a test used to measure how freely charges flow through a material (measured in / square). It is generally used to measure items that are not typically grounded directly. For additional information, or to get copies of the ESD standards or test methods, visit the ESD Association website at http://www. esda. org. Page 5 Isolation FAQ If your workbench includes electrical components, you must isolate those components from the workbench to ensure proper grounding. Isolation of electrical components helps ensure that the electric charge dissipated from the worksurface goes through the correct path to ground (through the ground cord with the 1 M- resistor). Electrical components (with third wire ground) do not have this resistor, making it a quicker path to ground, unless this path is isolated from the charge. Electrical charges look for the quickest path to ground. Since the electrical ground does not have any resistance, this path is quicker than the primary worksurface ground. Adding insulative hardware or pads between the electrical products and the product they attach to prevent this path from occuring. Testing the overall bench: Using a Megohmmeter, the workbench resistance to ground should measure at least 106 ohms. Perform this test by measuring the resistance between the brass common ground stud (which you installed on the bench) and the earth ground. If the resistance is less than 106 ohms, then there is a ground loop, and it must be isolated from the bench. Testing individual components to ensure isolation: Using a Megohmmeter, measure the point to point resistance between all connection points of an electrical connection (power strip, light, etc), and the electrical outlet ground wire. The resistance should be greater than 106 ohms or this will be a path to ground. Page 6 Grounding Instructions for ESD Painted Cabinets Stand Alone Cabinets ·Determine where you want to install the ground cord; this location should be installed in the top or bottom covers of the cabinet and should be at least 5 inches from the front/rear of the cabinet. ·Using a center punch, create an indentation in the cabinet housing. ·Use a drill with a #19 (. 166 inch) drill bit to drill the hole into the cabinet. ·Insert the 10-24 x ½" self threading screw through the eye of the ground cord and screw into cabinet. The end of the ground cord closest to the inline resistor should be connected to this point. ·Drawers do not need to be grounded, as the charge is transferred through the metal components connecting the drawer to the cabinet housing. Always test your cabinet to ensure proper grounding. Multiple In-line Cabinets ·Ground your first cabinet as per the stand alone cabinet instructions. ·The row of cabinets should be bolted together, if they aren't already, for proper grounding. [. . . ] Page 11 Wrist Strap (WS) Ground Block (GB) Wrist Strap (WS) & Ground Block (GB) ·Choose a location under your workstation to place the Ground Block. ·Using the 2 #8 self-tapping screws, screw the Ground Block into the underside of the workbench top. ·Connect the ground block directly to the earth ground. There is a 1 Mega-ohm resistor already incorporated into the wrist strap. [. . . ]