3M 747 manual Shoes

Page 10

2.2 Threshold Resistance Settings for the 3M™ Shoes and Wrist Strap Tester 747

The test results indicated by the front panel LEDs are determined by comparison of the measured value with the threshold resistance settings (upper and lower limits).

LOW: the measured resistance is below the lower threshold

OK: the measured resistance is between the lower and upper thresholds

HIGH: the measured resistance is above the upper threshold

1.ESD Shoe Test Threshold Resistance Settings

The upper threshold (SHOES HIGH) and lower threshold (SHOES LOW) can be selected for shoe testing. Use tweezers to move the threshold switches

The upper threshold (SHOES HIGH) selections are 10, 35 or 100 Ω. The lower threshold (SHOES LOW) selections are 100 kΩ or 1 Ω.

2.ESD Wrist Strap Test Threshold Resistance Settings

The upper threshold (WRIST HIGH) can be selected for wrist strap testing.

Use tweezers to move the threshold switch.

The lower threshold is fixed at 1.65 Ω for wrist strap testing.

The upper threshold (WRIST HIGH) selections are 5, 10 or 35 MΩ.

Important Notes:

•Factory default settings are 100 MΩ for SHOES HIGH, and 10 MΩ for WRIST HIGH, and 1 MΩ for SHOES LOW.

•The SIGNAL OUT selection is set to SHOES. When operated as a stand-alone tester (that is, when not using the external output), this SIGNAL OUT selection should be set to either WRIST or

SHOES.

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Contents 3M Shoes and Wrist Strap Tester Table of Contents Introduction InspectionExplanation of Safety Label Signal Words & Symbols Intended UsePage Overview Product OutlineLCD Indicators Side Panels Back SidePreparation Before Testing Connecting the ESD Shoe Testing PlateShoes Power Preparation Installing and Replacing the Batteries Power Saver Function Turning Power On and OffTurning Power Off AC Adapter ConnectionTesting Wall MountingALL setting is described in .1, Open Collector Output ESD Shoe Testing with the 3M Shoes and Wrist Strap TesterImportant Note Use single-conductor wrist straps only External Output Function Open Collector OutputTest Result Output Terminal Test Result Output SettingsInternal Circuit Shoe and Wrist Strap ALL Setting Open-Collector OutputSpecifications RS-232C CommunicationsCable Connections PC ConnectionPC System Requirements Measurement Section Measurement Resistance Range 0 to 200.0 MΩMaintenance & Service Battery Replacement IndicatorError Messages LCD can display the following error messagesTesting Considerations CleaningOperational Verification Test Equipment Required Testing Wrist Strap RangesTest Set-Up Testing Wrist High Limits Refer to Wrist Test Table Testing Wrist Low Limit Refer to Wrist Test TableWrist Test Table Testing Shoe Ranges Testing Shoes Low Limits Refer to Shoes Test TableWeee Statement Regulatory InformationShoe Test Table CULus StatementFCC Electronic Solutions Division Static Control Products
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