3M Watch 746 User Manual

Wrist Strap Tester 746  
Instructions  
European Version  
March 2005  
78-8136-2118-8  
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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 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.  
2.0 Declaration of Conformity  
The 3M™ Wrist Strap Tester 746 is in conformity with  
the regulations of the EMC-directive 89/336/EWG.  
The following standards have been taken into account  
while designing and manufacturing the instrument:  
Accessories  
- Instruction Manual  
- Wall mounting kit, 3M™ Dual Lock™ system and  
template  
- Battery  
EN 60204-1/85  
EN 60204-1/91  
EN 61010 (Safety)  
EN 50082-1/92  
EN 50082-2/92  
- Cover for wrist strap plug-in jack  
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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
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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.  
4.0 Specifications  
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  
5.6  
If the "battery" LED illuminates at any time,  
replace the battery.  
5.1  
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  
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.  
5.2  
Fit the plastic cover onto the wrist strap plug-in  
jack that is not being used. If the "battery" LED  
illuminates, replace it immediately.  
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  
Put the wrist band on with ground cord attached,  
and insert the ground cord plug into the wrist  
strap plug-in jack.  
5.9  
For removal, lift the tester 746 at the two top  
corners with both hands.  
5.4  
5.5  
Depress the metal contact plate and hold it.  
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.  
4
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Wrist strap test circuit check:  
Connect the resistance substitution box to the 746 as  
shown in figure 2.  
6.0 Calibration Procedures  
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.  
Set the resistance substitution box to each value of  
resistance indicated in the test table and press contact  
plate A.  
Equipment needed:  
1. Resistance Substitution Box  
The LEDs will indicate as shown below if the unit is  
functioning within specifications.  
(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  
red  
green  
750 kΩ  
10 MΩ  
9.0 MΩ  
11.0 MΩ  
green  
red  
*This example is used in figure 2.  
746  
wrist strap tester  
700 k  
900 k  
9.0 M  
11.0 M  
o.k.  
o.k.  
A
Resistance substitution box  
Crocodile clip  
figure 2  
78-8136-2118-8  
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3M™ Wrist Strap Tester 746 Logbook  
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Example :  
Not ok :  
ok :  
Unit calibrated on:  
By:  
x
Next calibration on:  
Serial number:  
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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  
Litho in USA  
© 3M 2005 78-8136-2118-8  
Printed on 50% recycled paper  
with 10% post-consumer  
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