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3M 747 manual

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Table of contents for the manual

  • Page 1

    User ’ s Guide 3M ™ Shoes and Wris t S tr ap T ester 7 4 7[...]

  • Page 2

    1 T able of Contents Section Page Introduction ......................................................................................................................................2 Inspection .........................................................................................................................................2 Package Contents [...]

  • Page 3

    2 Introduction Thank you for purchasing this 3M ™ Shoes and Wrist Strap T ester 747. T o get the maximum performance from the unit, please read this user’ s guide first, and refer to it as needed. Inspection The AC adapter pro vided with the Shoes and Wrist Strap T ester 747 varies according to region. In North America, the Shoes and Wrist Str[...]

  • Page 4

    3 SAFETY INFORMA TION Read , understand and follo w all safety infor mation before operating this equipment. Retain this User’ s Guide for future reference. Intended Use: The 3M ™ Shoes and Wrist Strap T ester 747 is a single-unit instrument designed especially to measure electrical resistance for e valuating the ef fectiv eness of ESD (electro[...]

  • Page 5

    4 Do not use power supply to power unit in Europe. Unit is intended to be powered by non-rechargeable battery and input connector is not to be used. T o reduce the risks associated with an explosion hazard, which, if not avoided, could result in death or serious injury: • Do not use in an explosive environment. 3M ™ Shoe and Wrist Strap T ester[...]

  • Page 6

    5 1.0 Overview 1.1 Product Outline T o reduce the risks associated with an explosion hazard, which, if not avoided, could result in death or serious injury: • Do not use in an explosive environment. 3M ™ Shoes and Wrist Strap T ester 747 is not designed to be intrinsically safe. T o reduce the risks associated with a medical device malfunction,[...]

  • Page 7

    6 1.2 Part Names of the 3M ™ Shoes and Wrist Strap T ester 747 1.2.1 Front Panel 1. T est Result LEDs – Indicates test results according to specified threshold resistance. 2. LCD – Sho ws measurement values and test location status. 3. T est Location LEDs – Indicate the test location and status. 4. T ouch Panel – The touch panel is the m[...]

  • Page 8

    7 1.2.2 Side Panels 1. P o w er Switch – T ur ns the 3M ™ Shoes and Wrist Strap T ester 747 on and of f. 2. Threshold Resistance Selection Switches – Select the threshold resistances for shoes and wrist strap tests. 3. T est Result Output Selection Switch – Selects which test results are present at the OUTPUT terminal. 4. RS-232C Connector [...]

  • Page 9

    8 2.0 Preparation Before T esting 2.1 Connecting the ESD Shoe T esting Plate T o reduce the risks associated with an explosion hazard, which, if not avoided, could result in death or serious injury: • Do not use in an explosive environment. 3M ™ Shoes and Wrist Strap T ester 747 is not designed to be intrinsically safe. W ARNING T o reduce the [...]

  • Page 10

    9 2.2 Threshold Resistance Settings for the 3M ™ Shoes and Wrist Strap T ester 747 The test results indicated b y the front panel LEDs are deter mined by comparison of the measured value with the threshold resistance settings (upper and lo w er limits). LO W : the measured resistance is below the lo wer threshold OK: the measured resistance is be[...]

  • Page 11

    10 2.3 Power Preparation 2.3.1 Installing and Replacing the Batteries Important Notes: • T o avoid electric shock when r eplacing the batteries, turn the pow er switch off and disconnect the all cab les befor e beginning . Also, after r eplacing the batteries, always r eplace the co ver befor e using the unit. • When r eplacing the batteries, d[...]

  • Page 12

    11 2.3.2 AC Adapter Connection This 3M ™ Shoes and Wrist Strap T ester 747 can be operated from six “ AA” alkaline batteries or the supplied AC adapter . The A C adapter has priority , so when the batteries are installed and the adapted is connected , battery po w er is not drained. 1. Confirm that the pow er switch is turned off. 2. Connect[...]

  • Page 13

    12 Important Note: When oper ating on batteries, the pow er saver function minimizes battery dr ain, although a very small amount of curr ent is still requir ed by the tester . T urn the power switch of f to completely disconnect the batteries. 2.5 Wall Mounting The supplied W all-Mount Board allo ws the 3M ™ Shoes and Wrist Strap T ester 747 to [...]

  • Page 14

    13 The ALL setting is described in Section 4.1, “Open Collector Output. ” Error Message Meaning Solution Err .1 Finger removed from touch panel during measurement Repeat the test Err .2 Actual test type does not match specified test type Check test type (location), and repeat the test O.F . Measured value exceeded 200.0 MΩ (Overflow) Check te[...]

  • Page 15

    14 5. T esting finished in about a second , and the results are display ed as follo ws: • and symbol appear on the LCD . • The measured value appears on the LCD , and one of the result LEDs lights according to the test result (comparison of measured v alue and thresholds). • The shoe LED lights either g reen or red according to the test resu[...]

  • Page 16

    15 4. T esting finished in about a second , and the results are display ed as follo ws: • and symbol appears on the LCD . • The measured value appears on the LCD , and one of the result LEDs lights according to the test result (comparison of measured value and thresholds). • The wrist strap LED lights either g reen or red according to the te[...]

  • Page 17

    16 T est Result Output T erminal Mating Plug (stereo mini-phone) Mating Plug Size: 14 mm by 13.5 mm diameter Open Collector Output Ratings Internal Circuit Important Note: Mating plus not included. Please ensur e that the plus used is of the type indicated abo ve. T est Result Output Settings Using tw eezers, select the test result type to be pro v[...]

  • Page 18

    17 Open-Collector Output • When the SIGNAL OUT s witch is set to ALL: The output transistor switches on when the results of the shoe and wrist strap test are OK. When making alter nating shoe/wrist strap tests, the type of test to be conducted next is indicated b y the blinking symbol on the LCD and the blinking LED . • When the SIGNAL OUT s wi[...]

  • Page 19

    18 4.2 RS-232C Communications Important Notes: • Always turn the pow er switch off w hen making connections. T o avoid damag e to the Shoes and Wrist Str ap T ester 747, do not apply more than the r ated voltage and curr ent to the OUTPUT connector . • T o avoid damage to the unit, do not short or input voltag e to the RS-232C terminal. • Whe[...]

  • Page 20

    19 Pin Signal I/O Description 2 RxD IN Receiving Data 3 TxD OUT Sending Data 5 GND GND Signal Ground Other pins are not used. PC Connection The RS-232C signal wires used are as follo ws (no other lines are used). Cable Connections The 3M ™ Shoes and Wrist Strap T ester 747 connects to the PC through a crosso ver cab le. The transmit and receiv e [...]

  • Page 21

    20 5.0 Specifications 5.1 Measurement Section The measurement resistance range is automaticall y selected from the follo wing according to the actual measured v alue. The resistance range cannot be set manually . Measurement Resistance Range (0 to 200.0 M Ω ) 2-M Ω Range Max. display value: 2.000 M Ω (0.001 - M Ω resolution) 20-M Ω Range[...]

  • Page 22

    21 5.2 General Specifications for the 3M ™ Shoes and Wrist Strap T ester 747 Ambient Operating Conditions The unit should always be operated indoors, max. 6.562’ (2000 m) height Ambient Storage Conditions Do not store or use the unit where it will be exposed to direct sunlight, high temperatures, high humidity or condensation. If exposed to su[...]

  • Page 23

    22 Important Notes: • Remove the batteries bef or e stor age to pr event possible corr osion cause by battery leakag e if the Shoes and Wrist Strap T ester 747 will not be used for a long period of time. • When using the AC adapter , remo ve the batteries fr om the Shoes and Wrist Str ap T ester 747 to pr event corr osion due to possible electr[...]

  • Page 24

    23 Problem Items to check Measurement does not start when pressing the touch panel Are the batteries depleted? Is the AC adapter connected? (Sec. 2.3.2) Is the power switch on? (Sec. 2.4) Abnormal measurement values Is the shoe testing plate connected? (Sec. 2.1) Abnormal test results Are the threshold resistance switch selections correct? (Sec. 2.[...]

  • Page 25

    24 Equipment Required • Resistance Substitution Bo x (RSB) – 630 K Ω to 103 M Ω (minimum range) ± 1% or discrete resistors ± 1%, using resistor v alues as indicated in the tabled belo w . • Lead wires – As required to connect between RSB and the 3M ™ Shoes and Wrist Strap T ester 747. • 3M ™ Copper F oil T ape with conducti ve a[...]

  • Page 26

    25 T esting Wrist Low Limit – Refer to Wrist T est T able 1. Switch on the 3M ™ Shoes and Wrist Strap T ester 747. 2. Select 5 M Ω position on the “Wrist High” switch. 3. Select Wrist position on the “Signal Out” switch. 4. Set reference resistor to 630 K Ω . 5. Press do wn on the “T ouch Panel” and observe LED indicators and v [...]

  • Page 27

    26 Figure 2 : Wrist Strap T est Set-Up 3M ™ COPPER FOIL TAPE RSB 3M ™ SHOES AND WRIST STRAP SENSOR T esting Shoe Ranges Connect the reference resistor to the “Shoe Plate Cable” and the tab of the 3M ™ Copper F oil T ape on the 3M ™ Shoes and Wrist Strap T ester 747 as show in the F igure 2. T esting Shoes Low Limits – Refer to Shoes T[...]

  • Page 28

    27 Shoe T est T able Reference Resistor Wrist High Range Switch Setting Wrist Low Range Switch Setting Wrist Strap Check LED Indicator T est Result LED Indicator Low Limit* ≤ 630 K Ω Ω ≥ 670 K Ω 5 M Ω 100 K Ω Red Green Low OK High Limit ≤ 4.8 M Ω ≥ 5.2 M Ω 5 M Ω 1 M Ω Green Red OK High High Limit ≤ 9.7 M Ω ≥ 10.3 M ?[...]

  • Page 29

    28 FCC This equipment has been tested and found to compl y with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to pro vide reasonab le protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and , if not ins[...]

  • Page 30

    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. Y ou assume all risks and liabili[...]