3M 747 manual External Output Function, Open Collector Output

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

• 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 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.

5.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 3M™ 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.

•Wrist strap testing can be done even when the shoe testing cable and plate are connected.

4.0External Output Function

4.1Open Collector Output

Important Note: Always turn the power switch off the Shoes and Wrist Strap Tester 747 when making connections. To avoid damage to the Shoes and Wrist Strap Tester 747, do not apply more than the rated voltage and current of the OUTPUT connector.

Test results are available at the OUTPUT connector. By providing external power, a relay or sequencer can be controlled, for example, to open and close an automatic door.

After a measurement, if the test result is OK, the transistor controlling the open- collector output will turn on for 400 ms.

The output transistor functions as a switch between the output signal and internal ground. When the test result is OK, current flows from the output terminal to the internal ground.

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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 Turning Power On and Off Turning Power OffPower Saver Function 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 TableRegulatory Information Shoe Test TableWeee Statement CULus StatementFCC Electronic Solutions Division Static Control Products
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