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4 / 4 page TB-2000 Page 4 of 4 Figure 14. Hooking up ground cords. 4. If your installation includes a floor mat, you should duplicate step 2 and attach the floor mat ground to the same point as the worksurface ground wire. 5. Measure the resistance from the ground snap on the mat to the common ground point. It should read 1 megohm ± 20 percent if you are using a ground cord with a resistor, and less than 1 ohm if you are using a non-resistor ground cord. 6. Using a surface resistance tester per ESD TR53, test the resistance to ground from the center of the mat surface. Required equipment: a megohmmeter with 100 volt open test circuit voltage and two five pound electrodes per ASTM-150. Desco sells this as the Digital Surface Resistance Test Kit, item #19780. For more information on the 19780, ask for Technical Bulletin TB-3014. Limited Warranty Desco expressly warrants that for a period of one (1) year from the date of purchase, Desco grounding products will be free of defects in material (parts) and workmanship (labor). Within the warranty period, the product will be tested, repaired, or replaced at Desco’s option, free of charge. Call our Customer Service Department at 909-627-8178 (Chino, CA) or 781-821-8370 (Canton, MA) for a Return Material Authorization (RMA) and proper shipping instructions and address. Include a copy of your original packing slip, invoice, or other proof of purchase date. Any unit under warranty should be shipped prepaid to the Desco factory. Warranty repairs will take approximately two weeks. If your unit is out of warranty call Customer Service at 909-627-8178 (Chino, CA) or 781-821-8370 (Canton, MA) for a Return Material Authorization (RMA) and proper shipping instructions and address. Ship your unit freight prepaid and Desco will quote repair charges necessary to bring your unit up to factory standards. Warranty Exclusions THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT WARRANTIES, EXPRESSED AND IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED. The express warranty will not apply to defects or damage due to accidents, neglect, misuse, alterations, operator error, or failure to properly maintain, clean or repair products. Limit of Liability In no event will Desco or any seller be responsible or liable for any injury, loss or damage, direct or consequential, arising out of the use of or the inability to use the product. Before using, users shall determine the suitability of the product for their intended use, and users assume all risk and liability whatsoever in connection therewith. DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178 DESCO EAST - One Colgate Way , Canton, MA 02021-1407 • (781) 821-8370 • Web Site: Desco.com Figure 13. Installing 09814 to mat using supplied hardware. Mat Installation - General Information 1. For best results, allow the mats to lay flat for about four hours at room temperature before installing. This will give the material time to flatten out from being rolled for shipment. 2. Test grounds for proper resistance to ground. See Desco Technical Bulletin TB-2007 for a complete discussion of grounds. 3. Lay the mat in position and snap the ground cord to it. Bring the other end of the ground cord to the common ground point and attach it using the ring terminal. A suggested ground point is the center screw of a standard AC electrical outlet. Testing is recommended to ensure that the screw is properly grounded. Tie the ground wire to the bench to keep it out of the way and neat. You may cut and strip the ground wire to a shorter length and attach it with the extra ring terminal included with each Desco ground cord. Figure 15. Adding the wriststrap. BE SURE YOU TEST ALL GROUNDS AND THE WRIST STRAP FREQUENTLY. The following bulletins are available from Desco: TB-2004 Operation of 19350 Wrist Strap Tester TB-2005 Wrist Straps, Grounding, Testing, Maintenance TB-2007 Safe Grounding of Static Controlled Workstations Maintenance and Cleaning For optimum electrical performance, Desco recommends for work surface mats our Reztore™ Surface and Mat cleaner, item #10435, and for floor mats our Statguard® Floor Mat cleaner, item #10443. DO NOT USE CLEANERS WITH SILICONE. They will build up a silicone coating on the surface which will cause the surface to become an insulator. Many common household cleaners contain silicone. 09825/09826 “GREEN WIRE” UTILITY GROUND POINTS RING TERMINAL CAN BE ATTACHED HERE © 2012 DESCO INDUSTRIES INC. Employee Owned 7. If you are using a mat kit that includes the wrist strap, install the wrist strap directly to the common point mat ground cord banana jack. Again, test the resistance from the backplate of the wrist strap to the common ground point. It should read 1 Megohm ± 20 percent. 6. The 09813 / 09814 mat ground cord may be either attached to a mat by snapping onto a 10mm socket, or by bolting it to the mat with the hardware supplied with the cord. When bolting the 09814 to the mat use a 3/8" diameter hole punch to create the hole for mounting. This will allow cord to sit flush on the mat. Note: For both applications, remove screw from floor mat ground before attaching to mat. |
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