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MO 0765-0601

V. Wall Mounting

The enclosed 3M Dual Lock™ fastening discs
must be screwed to the wall using the attached
template approximately 1,500mm (5 feet) above
the floor. Drill three holes of 5 mm (0.2 in)
diameter at marked locations. Make sure the area
on the 740 in which the Dual Lock™ fastening
strips are placed is free of dust and dirt. Attach the
3M Dual Lock™ fastening strips to the rear of the
740 tester to the bottom and top in parallel; see
drawing for locations.

For securing on the wall, press the 740 firmly
against the discs. For removal of the 740, lift the
top corners with both hands.

VI. Wrist Strap Test

Put the wrist band on with ground cord attached
and insert the ground cord into the wrist strap
plug-in jack. 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
k

 to the upper selected value of 2, 5, 10 or 35

M

. If a red "<" LED is illuminated, the current

limiting resistor in the ground cord is bypassed
and the cord has to be replaced. The red ">" LED
indicates that the selected resistance range is
exceeded. Check to see if the high resistance is in
the cord, the wrist band or in the contact between
wrist band and the operator's skin. To check the
resistance of the ground cord, leave the plug end
of the ground cord attached to the tester and
disconnect the snap end from the wrist band.
Connect ground cord snap to the stud in the hand
symbol or press it onto the contact plate and
depress the plate until one of the LEDs is
illuminated.

If the green LED illuminates
now, the ground cord can be
used.

If the red ">" LED is
illuminated, replace the
ground cord.

In some cases, high contact resistance between the
skin and wrist band will cause the tester to show a
red ">" LED condition. This resistance may be
caused by dry skin or the presence of hair in the
wrist area. The use of a skin lotion is
recommended to solve this problem. If a red ">"
LED condition still exists, replace the wrist band.

Note: The use of skin lotions are not
recommended for use with the 3M™ 4600 Series
Thermoplastic Wrist Bands.

Rear of the 740

Template

5 feet

(1 500 mm)

Summary of Contents for 740

Page 1: ...1 11 MO 0765 0601 740 wrist strap shoe tester 3 o k 1 2 3 740 Wrist strap shoe tester Operating Instructions MO 0765 0601 April 2001 ...

Page 2: ...gh resistance I General Personnel grounding devices such as wrist straps and conductive footwear 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 For this reason it is important to test wrist straps and conductive footwear on a regular basis to ensure they are functioning properly and that the test results c...

Page 3: ...maximum resistance is exceeded The 740 can be connected to external devices such as computers for data recording electrical door opening systems counter or other evaluating components The 740 wrist strap and shoe tester consists of Instruction manual with daily log sheet Base unit Data output connector plug Wall mounting kit 3M Dual Lock fastening system and template Cover for wrist strap plug in ...

Page 4: ...minated the current limiting resistor in the ground cord is bypassed and the cord has to be replaced The red LED indicates that the selected resistance range is exceeded Check to see if the high resistance is in the cord the wrist band or in the contact between wrist band and the operator s skin To check the resistance of the ground cord leave the plug end of the ground cord attached to the tester...

Page 5: ...an the soles of the shoes or check shoe grounding system heel ground or toe ground strap and retest If after cleaning the red LED remains on replace appropriate device If the red LED is illuminated the minimum resistance of the shoes or shoe grounding system is below 750 kΩ Note Some types of shoe grounding systems are manufactured with a resistance of less than 750 kΩ These types of systems are u...

Page 6: ...tal signals high low while testing the personnel grounding devices These digital signals can be used for data recording Example 1 and authorization control equipment such as electrical door opening systems Example 2 The output of the 740 will give you permanently 5 V at pin 3 and DC return at pin 6 The remaining pins 1 2 4 and 5 open collector will be high max 30 V 20 mA have to be provided extern...

Page 7: ... h o l o l i h i h i h Data output connector pin status when testing wrist strap shoe The sequence for testing must be wrist strap test first and then the shoe test Shaded pin indicators will read hi if the sequence is reversed or only the shoe tests are performed Data Output Connector pin 1 2 4 5 high or low pin 3 5 V pin 6 DC return IX Specifications Dimension of base unit 138 mm x 190 mm x 53 m...

Page 8: ...n of wrist strap test circuit Connect the reference resistor to the 740 as shown in the Figure 1 Switch the 740 unit on Select the 2 MΩ range and use the reference resistors as indicated in the test table and press contact plate A The LEDs will indicate as shown below if the 740 performs within specifications Repeat this procedure for 5 10 and 35 MΩ ranges Reference Resistance LED resistor range s...

Page 9: ...ge using the reference resistors indicated in the test table and press contact plate B The LEDs will indicate as shown below Repeat this procedure for 35 50 and 100 MΩ ranges Reference Resistance LED resistor range settings Indication 750 kΩ 10 MΩ range Red 900 kΩ Green 9 0 MΩ Green 11 0 MΩ Red 31 5 MΩ 35 MΩ range Green 38 5 MΩ Red 45 0 MΩ 50 MΩ range Green 55 0 MΩ Red 80 0 MΩ 100 MΩ range Green 1...

Page 10: ... T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T 1 t s e T 2 t s e T x 3M 740 Wrist Strap Shoe Tester Logbook Example Not ok ok Unit calibrated on By Next calibration on Serial number r a e Y h t n o M e m a N 1 2 3 ...

Page 11: ...eofpurchase 3MMAKESNOOTHERWARRANTIESINCLUDING 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 ...

Page 12: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information SCS 740 ...

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