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3M 740, Руководство по эксплуатации

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MO 0765-0601

740

wrist strap + shoe tester

3

<

>

o.k.

1

2

2    -
5    -

10    -
35    -

-     10
-     35
-     50
-  100

on / off

+

-

Output

R

max

DC 24

•

30 V / 150 mA 

750 k

Ω

A

B

X. Verification Procedure

The following procedure can be used to determine
if the 740 operates within its specifications.

Please note: The tester has no adjustable
components.

Equipment needed:

1.   resistors

-

750 k

Ω

 - 120 M

Ω

, tolerance 

±

 1%

2.   2 wires
as required to connect the reference resistor

Verification 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 M

Ω

 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 M

Ω

 ranges.

Reference

Resistance

LED -

resistor

range settings

Indication

*750 k

Ω

2 M

Ω

 - range

Red

900 k

Ω

Green

1.8 M

Ω

Green

>2.2 M

Ω

Red

4.5 M

Ω

5 M

Ω

 - range

Green

>5.5 M

Ω

Red

9.0 M

Ω

10 M

Ω

 - range

Green

>11.0 M

Ω

Red

31.5 M

Ω

35 M

Ω

 - range

Green

>38.5 M

Ω

Red

*This example is used above

Figure 1

Содержание 740

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

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

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