746

Wrist Strap Tester 746 Instructions European Version March 2005 78-8136-2118-8 1.0 General 3.0 Description Wrist straps are the primary method to minimize charge generation on the human body. They must be able to drain this charge as rapidly as it is generated. The 3M™ Wrist Strap Tester 746 operates as a battery powered tester, or additionally with an AC power supply as backup for the battery. It is designed to be used either as a stationary or portable piece of equipment. The 746 is supplied with a 9V alkaline battery - a power supply is optional. For this reason, it is important to test wrist straps on a regular basis to ensure they are functioning properly, and the test results should be recorded. The 3M™ Wrist Strap Tester 746 is in conformity with the regulations of the EMC-directive 89/336/EWG. The tester has a permanent, internally set resistance range which extends from 750 kΩ to 10 MΩ. When tested, if the wrist strap is within this resistance range, the green LED will illuminate. The red LED indicates that the resistance to ground of the tested device or system is out of range. The following standards have been taken into account while designing and manufacturing the instrument: Accessories 2.0 Declaration of Conformity - Instruction Manual - Wall mounting kit, 3M™ Dual Lock™ system and template - Battery - Cover for wrist strap plug-in jack EN 60204-1/85 EN 60204-1/91 EN 61010 (Safety) EN 50082-1/92 EN 50082-2/92 5 746 wrist strap tester o.k. o.k. 4 2 6 3 9 7 1 8 1 500 mm (5 feet) figure 1 78-8136-2118-8 3 4.0 Specifications For checking the resistance range of the ground cord, leave the plug end of the ground cord attached to the tester and unsnap the cord from the wrist band. Place the metal side of the ground cord snap against the metal plate of the tester and depress until one of the LEDs is illuminated. If the red LED is illuminated, the ground cord is outside the resistance range and should be replaced. If the green LED illuminates, the ground cord can be used, but the wrist band may have to be replaced. Base unit: 158 x 95 x 33 mm (6.25 x 3.75 x 1.25 inches) Weight: 200 g (7 ounces) without battery Battery: 9V alkaline type, e.g. IEC 6F22 Tolerance: 750 kΩ + 20%/-0%, 10 MΩ ± 10% Note: In some cases, high contact resistance between the person's skin and wrist band will cause the tester to show a fail/red LED condition. This resistance may be caused by dry skin or hair in the wrist area. If these possibilities do not match to the operator, the wrist band should be replaced. Measurement Voltage: DC (19±1) V (open circuit) Power Supply (not included): DC 9V, regulated, 75mA (50Hz) 5.0 How to Use 5.1 5.2 5.6 Insert 9V battery and make sure the ON/OFF switch at the upper left side on the unit is in the ON position. The OFF position avoids discharge of the battery if the metal contact plate is accidentally depressed while the unit is not in use. The unit is then ready for operation. The backup of the battery can be achieved by using an AC Power Supply. In that case, connect the AC power supply to the jack at the base of the unit. Plug the power supply into an AC 230V outlet. Wall Mounting Fit the plastic cover onto the wrist strap plug-in jack that is not being used. If the "battery" LED illuminates, replace it immediately. Put the wrist band on with ground cord attached, and insert the ground cord plug into the wrist strap plug-in jack. 5.4 Depress the metal contact plate and hold it. 5.5 One of the indicator LEDs will illuminate. An illuminated green LED indicates that the wrist strap performs within the resistance range of 750 kΩ to 10 MΩ. If a "red" condition is indicated, it is advisable to check the ground cord individually for its resistance. 5.7 The enclosed 3M™ Dual Lock™ adhesion discs shall be screwed on the wall using the attached template approximately 1500 mm (5 feet) parallel off the floor. Drill three holes of 5 mm (0.2 in) diameter at marked location. 5.8 The enclosed 3M Dual Lock adhesion strips must be adhered to the rear of the 3M™ Wrist Strap Tester 746 parallel to the bottom edge and below the battery compartment. Note: Make sure the area on the unit in which the Dual Lock adhesion strips are placed is free of dust and dirt. Press the tester firmly against the discs for fixing on the wall. Wrist Strap Test 5.3 If the "battery" LED illuminates at any time, replace the battery. 5.9 4 For removal, lift the tester 746 at the two top corners with both hands. 78-8136-2118-8 6.0 Calibration Procedures Wrist strap test circuit check: The 3M™ Wrist Strap Tester 746 cannot be adjusted, but the following steps can be used to determine that the tester is operating within its specification. Connect the resistance substitution box to the 746 as shown in figure 2. Set the resistance substitution box to each value of resistance indicated in the test table and press contact plate A. The LEDs will indicate as shown below if the unit is functioning within specifications. Equipment needed: 1. Resistance Substitution Box (750 kΩ - 11 MΩ, tolerance < 2%) 2. 2 leads (to connect the resistance box) Resistance substitution box settings Resistance range of the 746 LED indication *750 kΩ 900 kΩ 750 kΩ red green 9.0 MΩ 11.0 MΩ 10 MΩ green red *This example is used in figure 2. 746 wrist strap tester 700 k o.k. o.k. 900 k 9.0 M 11.0 M A Resistance substitution box Crocodile clip figure 2 78-8136-2118-8 5 3M™ Wrist Strap Tester 746 Logbook Month / Year 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Name W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Test 1 Test 2 Example : Not ok : ok : Unit calibrated on: By: x Name Month / Year 1 2 3 4 5 6 7 Next calibration on: W W W W W W W Serial number: Test 1 x x x T e st 2 x x 6 78-8136-2118-8 3M is a trademark of 3M Company. All other trademarks are the properties of their respective owners. Important Notice All statements, technical information, and recommendations related to 3M’s products are based on information believed to be reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must evaluate it and determine if it is suitable for your intended application. You assume all risks and liability associated with such use. Any statements related to the product which are not contained in 3M’s current publications, or any contrary statements contained on your purchase order shall have no force or effect unless expressly agreed upon, in writing, by an authorized officer of 3M. Warranty; Limited Remedy; Limited Liability. This product will be free from defects in material and manufacture for a period of one (1) year from the time of purchase. 3M MAKES NO OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. If this product is defective within the warranty period stated above, your exclusive remedy shall be, at 3M’s option, to replace or repair the 3M product or refund the purchase price of the 3M product. Except where prohibited by law, 3M will not be liable for any indirect, special, incidental or consequential loss or damage arising from this 3M product, regardless of the legal theory asserted. Electronic Solutions Division 6801 River Place Blvd. Austin, TX 78726-9000 http://www.3M.com/electronics Printed on 50% recycled paper with 10% post-consumer Litho in USA © 3M 2005 78-8136-2118-8