3M™ Wrist Strap Monitor Model 725
Contents
1. 3M Wrist Strap Monitor Model 725 User s Guide itor wrist StraP ME gM 725 O Index Section Page Safety Information 2 2 rre e eae M espe Eo bes Pod pe GCC GL yn 2 4 2 Operating Your System euenit GG CR 6 3 Installation When Attaching to a Static Control Work Surface 7 4 Installation Under Work Bench eese inet 8 5 Installation Using 3M Belt Clip Model 723 sse 9 6 Parking Clipes CH YD a td FD 9 T Battery ee 10 8 Verification Procedure for the 3M Wrist Strap Monitor Model 725 10 9 Specifications iiie een ERG PORE EH HEB ddy 12 10 SC 12 11 Required Accessories and Optional Available Parts 13 12 Additional Wrist Strap Monitoring Information sees 14 13 gt WANT ANIL oss eiu 15 SAFETY INFORMATION Please read understand and follow all safety information contained in this User s Guide prior to the use of this 3M Wrist Strap Monitor Model 725 Retain these instructions for future reference Intended Use The 3M Wrist Strap Monitor Model 725 is designed to monitor the operation of a wrist strap grounding system for a single operator This product has been designed and tested for use with 3M Dual Conductor Wrist Straps and 3M Work Surfaces Grounding Systems This unit is powered by a 9 volt alkaline battery Use of oth2. Metal Wrist Band small 2385 3M Dual Conductor Metal Wrist Band medium 2386 3M Dual Conductor Metal Wrist Band large 2360 3M Dual Conductor Coil Cord 5 ft 1 5m 2370 3M Dual Conductor Coil Cord 10 ft 3 0m 2371 3M Dual Conductor Coil Cord 20 ft 6 1m 3057 3M Stand By Jack 1 9x 1 3 x 1 1 in 4 8 x 3 3 x 2 8cm 723 3M Belt Clip Includes Band amp Cord Only accessories optional parts and replacement parts supplied or specified by 3M Company shall be used with this product Use only a clean dry cloth to clean the 3M Wrist Strap Monitor Model 725 For Repair amp Service Center 11705 Research Boulevard Building 1 Austin TX 78759 Phone 800 426 8688 press 2 13 SECTION 12 Additional Wrist Strap Monitoring Information Suggested reading on wrist strap reguirements and wrist strap monitoring EIA 625 Requirements for Handling Electrostatic Discharge Sensitive ESDS Devices e EN100015 1 Protection of Electrostatic Sensitive Devices 3M Tech Response 123 Pulsed Current vs Constant Current in Work Station Monitors 3M Static Digest Issue No 1 1998 Disc Drive Industry Static Control Considerations Note The 3M references are available by calling 3M Electronic Solutions Division Customer Service Department at 1 866 722 3736 SECTION 13 Important Notice All statements technical information and recommendations related to 3M s products are based on information believed to be
3. wires to the RSB Attach the other ends of the wires with clips to the metal jaws of the Wrist Strap Monitor Model 725 dual conductor ground clip Be sure to prevent the clips from contacting each other Plug in the phone jack test cord into the wrist strap jack on the front of the monitor and short the opposite ends together Set the RSB as follows and observe the lamp and audible alarm 5 0 Megohms Red lamp OFF audible alarm OFF 11 5 Megohms Red lamp ON Continuous audible alarm ON Continuous tone SECTION 9 Specifications 3M Wrist Strap Monitor 2 5 X 2 6 x 1 1 in Model 725 Size 6 4 x 6 6 x 2 8cm Accuracy 15 Test Voltage 9 VDC Open circuit Test Current Less than 1 microamp Power Supply Requirements 9 Volt alkaline battery recommended Not supplied Environmental Temperature Humidity Operating Conditions Maximum 110 F 43 C Maximum relative humidity 75 Minimum 50 F 10 C SECTION 10 Parts Included 1 ea Wrist Strap Monitor Model 725 with 6 ft dual conductor ground cord clip and parking clip 1 ea User s Guide amp Verification Procedure 12 SECTION 11 Required Accessories and Optional Available Parts Model No Description Size 2368 3M Dual Conductor Fabric Wrist Band adjustable 2381 3M Dual Conductor Metal Wrist Strap small 2382 3M Dual Conductor Metal Wrist Strap medium 2383 3M Dual Conductor Metal Wrist Strap large 2384 3M Dual Conductor
4. Donot use in wet or humid environments To reduce the risk of damage to components or assemblies being handled Always properly ground your tools and dissipative surfaces to known good ground before connecting the Wrist Strap Monitor Model 725 for monitoring If unsure of suitable ground contact a licensed electrician before installation Always ensure operator grounding during use of monitor The Wrist Strap Monitor Model 725 does not provide grounding ENVIRONMENTAL CONDITIONS This equipment has been tested and found to be safe to operate within these environmental conditions This is not a warranty of equipment performance within these conditions ndoor use only Ingress Protection IPXO Altitude Up to 2 000 m Pollution degree 2 e Temperature Maximum 1109F 43 C Minimum 50 F 10 C Humidity Maximum relative humidity 8096 for temperatures up to 319C decreasing linearly to 50 relative humidity at 40 C 3M Wrist Strap 3M Dual Conductor 3M Dual Conductor Monitor Model 725 Metal Wrist Strap Fabric Wrist Strap Figure 1 3M Wrist Strap Monitor Model 725 with 3M Dual Conductor Wrist Strap Assemblies SECTION 1 Theory of Operation Refer to Figure 1 The 3M Wrist Strap Monitor Model 725 is designed to monitor the operation of the wrist strap grounding system of a single operator The system features special wrist bands and ground cords that contain two independent conductors The Wrist Strap Mon
5. HA
6. connected from the wrist band The system is now ready for use SECTION 4 Installation Under Work Bench The 3M Wrist Strap Monitor Model 725 can be mounted under a work bench by securing with two 8 screws not supplied through the mounting hole tabs located on the top cover When mounting the Wrist Strap Monitor Model 725 under a work bench for non mobile use remove the parking clip Section 6 from the Wrist Strap Monitor Model 725 using a small screwdriver Figure 4 The Wrist Strap Monitor Model 725 is now ready to mount Note Use of the monitor in this way precludes grounding a work surface through the snap connector on the bottom of the monitor A static Position the monitor so that it is control work surface if present would reguire convenient for the operator to plug grounding separately through an additional ground cord their wrist strap ground cord into the jack on the front of the monitor It is recommended that the front face of the monitor be flush or slightly recessed from the front edge of the work bench Attach the monitor to the work bench with the screws It may be necessary to pre drill pilot holes for the screws Attach the dual conductor ground clip or each wire of the monitor s dual conductor ground cord to a suitable ground Use of an optional 3M Stand By Jack 3057 at the work station extends the life of the monitor s input jack The user disconnects the wrist strap ground cord from the
7. er components or use in any other application not evaluated by 3M may cause improper performance and or an unsafe condition To avoid damage to the 3M Wrist Strap Monitor Model 725 do not use this monitor outside of the operating conditions listed in this user s guide Explanation of Symbols CAUTION Operator s Wrist Strap Assembly Ground Work Surface Ground Earth ground Power input connector polarity center negative Explanation of Signal Word Consequences WARNING _ Indicates a potentially hazardous situation which if not avoided could result in death or serious injury and or property damage CAUTION Indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury and or property damage NOTICE Indicates a situation which if not avoided could result in property damage WARNING To reduce the risks associated with medical device malfunction which if not avoided could result in serious injury or death Persons with active implanted medical devices such as heart pacemaker devices should never use this monitor CAUTION To reduce the risks associated with environmental contamination which if not avoided could result in minor or moderate injury Dispose of monitor in accordance with all applicable local and government regulations NOTICE To prevent damage to the 3M Wrist Strap Monitor Model 725 Users should not attempt to service this device
8. erator when Connected to the 3M Wrist Strap Monitor Model 725 There is a concern about the voltage that is applied to an operator while they are connected to a monitor Some of today s electronic components are extremely sensitive to electrostatic discharge from a person less than 10 volts The following chart for the Wrist Strap Monitor Model 725 illustrates the level of voltage that will appear on the operator under various resistance conditions Voltage on Operator when connected to the Wrist Strap Monitor Model 725 Condition Observed Voltage No Skin Resistance 0 8V 200K Ohm Skin Resistance 0 9V Likely Case Before Alarm 3 5V Worst Case Before Alarm 6 8V Absolute Worst Case 9 0V Note For more information about wrist strap monitoring see Additional Wrist Strap Monitoring Information Section 12 SECTION 2 Operating Your System To operate the 3M Wrist Strap Monitor Model 725 attach the monitor s 6 ft ground cord with dual conductor ground clip to a suitable ground Attach a 3M Dual Conductor Ground Cord to a 3M Dual Conductor Wrist Band Place the wrist band on your wrist and plug the cord into the jack on the front of the Wrist Strap Monitor Model 725 Plugging into the jack activates the monitor and causes it to emit a short beep and the red lamp to momentarily flash If the red lamp flashes with an intermittent audible alarm or at any time during use the resistance of the wrist strap assembly is greater
9. fe of the dual conductor ground cord plug and the monitor s input jack The parking clip is already attached to the mounting tab of the Wrist Strap Monitor Model 725 If the Wrist Strap Monitor Model 725 is to be mounted under a work bench for permanent use remove the parking clip from the Wrist Strap Monitor Model 725 using a small screwdriver SECTION 7 Battery Replacement When only the red lamp illuminates on the 3M Wrist Strap Monitor Model 725 it is time to change the battery Unplug the wrist strap ground cord from the Wrist Strap Monitor Model 725 jack before proceeding Remove the top cover of the Wrist Strap Monitor Model 725 case by sgueezing the two tabs grooved area located on the bottom cover inward while lifting the top cover Remove the used battery carefully by using a pulling twisting motion to unsnap the battery from the connectors on the printed circuit board Figure 6 Install a new 9 volt alkaline battery by supporting the snap connectors on the printed circuit board with your fingers while using a pushing twisting motion to fully seat the terminals of the battery into the snap connectors Note Use an alkaline battery for longer life Pass the monitor s ground cord through one of the two exit wire slots in the bottom half of the case Align the rear locking tab on the top cover to the tab slot on the bottom cover while maintaining the ground cord in the desired wire slot Rotate the top cover downwa
10. itor Model 725 performs a resistance measurement by applying an electrical current of less than 1 pA The path for the current is through one conductor of the wrist strap ground cord that contains a current limiting resistor through one side of the wrist band through the skin of the wearer under the band through the second side of the wrist band through the second conductor of the wrist strap ground cord that contains a current limiting resistor and finally back to the monitor If the resistance of the wrist strap loop is less than 35 megohms the wrist strap ground cord wrist band and the interface of the wrist band to the arm of the wearer are considered to be functioning correctly If the measured resistance is over 35 megohms a red lamp flashes along with a chirping audible alarm In addition the Wrist Strap Monitor Model 725 monitors the ground clip connection to a predetermined electrical ground This is accomplished by measuring the resistance from the monitor through one conductor of the monitor s ground cord and metal clip through the ground point conducting medium through the other metal clip and conductor of the monitor s ground cord and finally back to the Wrist Strap Monitor Model 725 If the resistance of this loop exceeds 10 megohms a red lamp will illuminate with a continuous audible alarm This indicates that there is a problem with the monitor s ground cord or the ground point connection 3M Dual Conductor Cord a
11. mp Wrist Band are required for use with Resistance values are 15 the 3M Wrist Strap Monitor Model 725 ordered separately Resistance values are 15 50 The 3M Wrist Strap Monitor Model 725 requires only a small amount of current to operate When the red lamp and the audible alarm are activated simultaneously the monitor requires approximately 5 uA of current When the lamp and alarm are not activated normal condition the monitor requires approximately 50 HA of current NOTICE As with any battery operated electronic device the life NOTICE of the battery will be determined by the frequency of The 3M Wrist Strap Monitor use However for the Wrist Strap Monitor Model 725 Model 725 does not have the you can expect a battery life of approximately one year capability of verifying that the ground point is a suitable ground If you are not sure what a suitable ground is contact a licensed electrician before installation in continuous operation under normal conditions Note Use an alkaline battery for longer life The Wrist Strap Monitor Model 725 monitors the battery voltage and alerts the operator when it is necessary to change the battery When the battery voltage falls below 6 volts the red lamp will illuminate with no audible alarm At this time the Wrist Strap Monitor Model 725 is still operational making reliable resistance measurements of the wrist strap assembly and the ground connection Voltage on Op
12. oint for an operator To ground a work surface the Wrist Strap Monitor Model 725 contains a snap located on its bottom cover that is connected internally to the monitor s ground cord To use this feature there must be a 3M Female Snap Fastener Model 3034 10 mm snap fastener attached to the grounding layer of the work surface Simply align the male snap on the monitor with the female snap on the work surface and press downward on Figure 3 the montor The Work HAU now Note Although the work surface is grounded by automatically grounded through a one the 3M Wrist Strap Monitor Model 725 it is megohm resistor by the Wrist Strap not monitoring the ground to the work surface Monitor Model 725 3M Work Surface 8200 Series use the female 10 mm 3M Female Snap Fastener Model 3050 snap fastener for grounding 3M Work Surfaces 1800 8300 and 8800 Series use the female 10 mm 3M Female Snap Fastener Model 3034 snap fastener for grounding In addition all 3M Portable Field Service Kits 8500 Series include the 10 mm Female Snap Fastener Model 3034 snap fastener Use of an optional 3M Stand By Jack 3057 at the work station extends the life of the monitor s input jack The user disconnects the wrist strap ground cord from the wrist band and plugs into the Stand By Jack 3057 which is mounted at the work station Plugging into the Stand By Jack 3057 prevents the Wrist Strap Monitor Model 725 from continuously alarming when dis
13. rd onto the two side locking tabs of the bottom cover and snap firmly into place SECTION 8 Verification Procedure for the 3M Wrist Strap Monitor Model 725 The Wrist Strap Monitor Model 725 cannot be recalibrated after the initial factory calibration However the following steps can be used to determine if the Wrist Strap Monitor Model 725 is operating within its specifications Equipment Needed Resistance Substitution Box RSB 1 Ohm to 45 Megohms 1 One two conductor cable with standard 3 5 mm miniature phone plug attached on one end and appropriate connectors on the other end to connect to RSB Two single conductor wires with clip style on one end and appropriate connectors on the other end to connect to a RSB Note Two conductor cables must have an isolation resistance of gt 1 Gigohm between conductors Two separated wires may also be used to obtain higher isolation resistance Procedure a Install a new 9 volt battery into the 3M Wrist Strap Monitor Model 725 b Short the dual conductor ground clip by attaching to a conductive metal object such as a coin c Plug the phone jack test cord into the wrist strap jack on the front of the monitor and attach the other end of the cord to the RSB Set the RSB as follows and observe the lamp and audible alarm 29 8 Megohms Red lamp OFF audible alarm OFF 40 2 Megohms Red lamp ON Flashing audible alarm ON Chirping d Connect the two single conductor
14. 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 year from time of purchase 3M MAKES NO OTHER WARRANTIES INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A P ARTICULAR 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 conseguential loss or damage arising from this 3M product regardless of the legal theory asserted Electronic Solutions Division Static Control Products 926 JR Industrial Drive Sanford NC 27332 9733 Toll Free 866 722 3736 International 919 718 0000 Please recycle Printed in USA Email 3mstaticinfo mmm com 3M 2014 All rights reserved www 3Mstatic com 78 9101 9994 8 J
15. than 35 megohms If the red lamp and the audible alarm remain on continuously check the dual conductor ground clip connection The system is now ready for use NOTICE If you decide not to use the dual conductor ground clip that is attached to the monitor s ground cord in the way described in this user instruction manual observe the following precaution Attach each of the two wires of the monitor s ground cord to separate ground bonding points By attaching the wires to the same ground but at different physical locations the monitor can check for loose or lost connections Figure 2 Note Operators may complain that the alarm is sounding too often until they learn to adjust the wrist band to fit securely or apply an approved skin moisturizer on a frequent basis Please remember that the monitor is informing you that the operator is exceeding the established static control requirement for resistance to ground when wearing a static protective wrist strap assembly These alarms alert the operator when sensitive electronics are possibly being exposed to static electricity Prior to incorporating the wrist strap monitor into your static control process the operator could be unaware of these events Resistance values are 15 SECTION 3 Installation When Attaching to a Static Control Work Surface The 3M Wrist Strap Monitor Model 725 can be used to ground a work surface while providing a monitored grounding p
16. wrist band and plugs into the Stand By Jack 3057 which is mounted at the work station Plugging into the Stand By Jack 3057 prevents the Wrist Strap Monitor Model 725 from continuously alarming when disconnected from the wrist band The system is now ready for use SECTION 5 Installation Using 3M Belt Clip 723 Optional An optional belt clip is available to further enhance the portability feature of the 3M Wrist Strap Monitor Model 725 This expands the use of the monitor when operators need to be highly mobile as in an electronic manufacturing environment Simply attach the belt clip with female snap connector to the male snap connector on the monitor bottom cover Slide the clip over your belt in a convenient place so that the wrist strap ground cord will not interfere with normal body movements when attached to the monitor Attach the dual conductor ground clip to a suitable ground at the work location During mobility attach the dual conductor ground clip to the parking clip on the Wrist Strap Monitor Model 725 See Section 6 SECTION 6 Parking Clip A parking clip is supplied with the Wrist Strap Monitor Model 725 allowing mobile users to silence the ground clip disconnect alarm Attaching the dual conductor ground clip to the parking clip prevents unnecessary disconnecting connecting of the wrist strap ground cord from the input jack during mobility An Figure 5 added benefit of this feature is that it extends the li
Download Pdf Manuals
Related Search