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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.
4.0 External Output Function
4.1 Open 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.