3M 747 manual Important Note Use single-conductor wrist straps only

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5.Testing finished in about a second, and the results are displayed as follows:

• 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 value and thresholds).

•The shoe LED lights either green or red

according to the test result:

•When the test result is OK, the LED lights green.

•When the test result is HIGH or LOW, the LED lights red.

6.When the test is finished, the results are displayed for about ten seconds. Afterwards, if running on batteries, the power turns off. If running on the AC adapter, the power saver activates the stand-by state.

Important Notes:

•The high end of the measurement range of the Shoes and Wrist Strap Tester 747 is 200.0 MΩ. If the measured value exceeds this limit, “O.F.” is displayed on the LCD.

•If the finger is removed from the touch panel during a test (while appears on the LCD), or if pressure is too light on the touch panel, “Err.1” appears on the LCD. In this case, repeat the test.

•If a test is performed while the wrist strap cable is connected to the front panel, the wrist strap is automatically selected for measurement.

3.2 ESD Wrist Strap Testing with the 3M™ Shoes and Wrist Strap Tester 747

Important Note: Use single-conductor wrist straps only.

This procedure tests the effectiveness of an ESD protective wrist strap, and displays the actual measured resistance value along with the qualitative test result.

1.Select the required threshold resistance values. Refer to Section 2.2, “Threshold Resistance Settings (2).”

2.Connect the wrist strap cable to the connector on the front panel.

3.Press the center of the touch panel with your finger. Continue pressing the

touch panel until measurement is completed (until the indicator goes out). Testing starts and the following indicators are displayed:

• and symbol appear on the LCD.

•The wrist strap LED lights yellow.

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Contents 3M Shoes and Wrist Strap Tester Table of Contents Inspection IntroductionIntended Use Explanation of Safety Label Signal Words & SymbolsPage Product Outline OverviewLCD Indicators Back Side Side PanelsConnecting the ESD Shoe Testing Plate Preparation Before TestingShoes Power Preparation Installing and Replacing the Batteries AC Adapter Connection Turning Power On and OffTurning Power Off Power Saver FunctionWall Mounting TestingESD Shoe Testing with the 3M Shoes and Wrist Strap Tester ALL setting is described in .1, Open Collector OutputImportant Note Use single-conductor wrist straps only Open Collector Output External Output FunctionTest Result Output Settings Test Result Output TerminalInternal Circuit Open-Collector Output Shoe and Wrist Strap ALL SettingRS-232C Communications SpecificationsPC Connection Cable ConnectionsPC System Requirements Measurement Resistance Range 0 to 200.0 MΩ Measurement SectionBattery Replacement Indicator Maintenance & ServiceLCD can display the following error messages Error MessagesCleaning Testing ConsiderationsOperational Verification Test Testing Wrist Strap Ranges Equipment RequiredTest Set-Up Testing Wrist Low Limit Refer to Wrist Test Table Testing Wrist High Limits Refer to Wrist Test TableWrist Test Table Testing Shoes Low Limits Refer to Shoes Test Table Testing Shoe RangesCULus Statement Regulatory InformationShoe Test Table Weee StatementFCC Electronic Solutions Division Static Control Products
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