TECHNICAL BULLETIN TB-2040 Combo Wrist Strap / Footwear Tester Made in the Installation, Operation and Maintenance United States of America Pass Range 750K - 10M and 750K - 100M a continuous, reliable ground is needed, and then continuous monitoring should be considered or even required. Per ESD SP9.2 APPENDIX B - Foot Grounder Usage Guidance Compliance verification should be performed prior to each use (daily, shift change, etc.). The accumulation of insulative materials on the FCS may increase the foot grounder system resistance. If foot grounders are worn outside the ESD protected area testing for functionality before reentry to the ESD protected area should be considered. Per ESD SP9.2 APPENDIX C -Parallel Ground Paths A parallel ground path allows a flow of electrical current through a path that is not intended for the test. Parallel ground paths may be caused by several different situations. Figure 1. Desco 19250 Combo Tester For example: a. The path represented by the person standing with one shoe on Description the floor and the other shoe on the test apparatus. A parallel The Desco 19250 Combo Tester is a 3-state touch tester path may be created by the shoe on the floor. Current from the designed for fast, frequent testing of ESD personnel grounding test instrument is then directed down two paths when it was devices. This product can be used as one of the tools to fulfill the intended to be directed down one. The correct path for the test ANSI ESD S20.20 paragraph 6.1.3.2 Compliance Verification is with one shoe in the air or on an insulating surface and the Plan. Verification should include routine checks of the Technical other shoe on the test plate. Requirements of the Plan. The Combo Tester incorporates a b. The path presented by a person inadvertently supporting unique dual test circuit design which improves accuracy of testing themselves by means of one hand on another object such as and eliminates the need for separate wrist strap and foot grounder a wall, table or supporting member in order to measure the test units. The 19250 is equipped with a 750 kilohm - 10 megohm resistance in one foot contact. The hand has created a parallel circuit, ideal for testing of wrist straps and a 750 kilohm - 100 path to ground. megohm circuit designed for accurate testing of footwear. c. The path represented by a person leaning against another Test parameters are factory set but can be adjusted to match your object with other parts of the body in order to provide physical own specifications. The 19250 is very simple to operate. A green support during a testing sequence. This can then lead to other light signals the user that everything is OK. A red light and an grounding paths and erroneous results. audible indicator means that the circuit resistance is either too low or too high. Packaging The Tester operates on either a 9 volt battery or a special AC Remove the Tester from the carton and inspect for damage. adapter. The Combo Tester is calibrated to NIST traceable standards and is available in three models. Items included with model 19250: 1 Combo Tester Model Description 1 9 volt battery 19250 Combo Tester, 9 Volt battery Items included only with model 19253: 19253 Combo Tester w/ FOOT PLATE 1 Combo Tester 19252 Combo Tester w/ Stand 1 Foot plate 1 Ground cord 19261 Combo Tester Mounting Plate 1 9 volt battery 98273 Foot Plate for Combo Tester Items included only with model 19252: 98254 Stand for Combo Tester 1 Combo Tester 98256 AC Adapter, 120V 1 Base plate 98257 AC Adapter, 220V 1 Pedestal tube with bracket and boot installed 1 4 banana plug connector CAUTION: Use only the AC adapter designed for this unit: 1 Vinyl insulator cap Item 98256 (120 volt) or Item 98257 (220 volt). Using any other 1 Wall poster adapters may damage the unit and void the warranty. 1 5/32 hex wrench 1 9 volt battery Per ESD Handbook ESD TR20.20 paragraph 5.3.2.4.4 Test Frequency Typical test programs recommend that wrist straps Model numbers 19253 and 19252 are ideally suited for testing foot that are used daily should be tested daily. However, if the products grounding devices. that are being produced are of such value that knowledge of DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Website: Desco.com 2013 DESCO INDUSTRIES INC. TB-2040 October 2013 Page 1 of 6 Employee OwnedInstallation The Combo Tester may be used as a portable unit, or may be permanently mounted on either a table or a wall. Please refer to the following instructions when installing your tester. Stationary Installation If you will be using the tester as a portable unit, you may prefer to mount the unit to a table or wall. Three keyhole slots on the back of the unit are included to allow you to attach the tester to a Figure 4. Replacing the battery stationary surface. General Instructions In the following test configurations, the 19250 can be used to test wrist straps while they are worn. Models 19253 and 19252 will also allow the user to test footwear. Insertion of the banana plug on the wrist strap cord activates the wrist strap tester circuit and deactivates the footwear test circuit. NOTE: When testing or calibrating, press and hold the test button until the test results are displayed. Allow 1-2 seconds for the unit to reset before pressing the test button again. WRIST STRAP TESTING WITH MODEL 19250 This test safely checks that a continuous path between the Figure 2. Mounting hole locations operator, wrist strap and ground cord exists. 1. Select location for mounting Tester. Install three 6 or 8 1. While wearing the wrist strap, plug the banana plug end of the screws spaced as illustrated in figure 3, into a wall or other cord into the jack on the face of the unit. vertical surface. Make sure that the screw heads do not project out more than 1/4 from mounting surface. The template on 2. Press rocker switch toward WRIST CORD. page four is actual size. 3. Press and hold the test button until the test results are 2. Mount the Tester on the screws, pulling down to lock it in place. displayed. NOTE: DO NOT TOUCH ANY OTHER METAL WHILE PERFORMING TEST. Figure 5. Testing the wrist strap Figure 3. Stationary installation of the Combo Tester 4. Lighting of the green PASS LED indicates that the wrist strap and ground cord assemblies are functioning properly. Operation The Combo Tester can be operated either on battery or AC power. 5. If either FAIL LO or FAIL HI LEDs light and the audible The unit comes equipped with a 9 volt alkaline battery. For AC indicator sounds, the wrist strap wearer should check the wrist operation, plug the optional AC adapter into the mini phone jack strap assembly immediately. located on the upper left hand corner of the tester. AC adapters are sold separately as item 98256 (120 volt) or 98257 (220 volt). TESTING FOOT GROUNDING DEVICES In order to test footwear you will need the model 19253 or 19252 LOW BATTERY INDICATOR Combo Tester. The following instructions are intended for use The Combo Tester includes a low battery indicator alarm circuit. while wearing foot grounding devices. When using a Footwear If both the audible alarm and indicator LED turn on during use, Tester that does not use a split FOOT PLATE, one needs to discontinue testing and replace the battery. The tester will test one foot at a time best practice is to raise the other foot continue to operate with a weak battery, but results should not be off the floor. When testing conductive shoes, or foot grounders considered accurate. worn on both feet, test each foot separately to test the separate path-to-ground. If the floor is an ESD floor, placing the other foot The battery can be easily replaced by removing the battery on the floor may result in erroneous test results. Care should compartment cover on the back of the unit and installing a new 9 also be taken not to create (hand resting on wall or bench) other volt battery. paths-to-ground. DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 DESCO EAST - One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Website: Desco.com 2013 DESCO INDUSTRIES INC. TB-2040 Page 2 of 6 Employee Owned