Enable/Disable Auto Power Off; Max/Min Button; Hold Button; Zero Calibration Procedure - Extech Instruments LT40 User Manual

Auto Power OFF
Enable/Disable Auto Power Off
LUX/FC Button
MAX/MIN Button
The meter can record the maximum, minimum, and average readings as described below:
HOLD Button
Zero Calibration Procedure
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To save battery life, the meter powers down automatically after approximately 12 minutes of
inactivity.
While the meter is ON, long press the Power button to disable the Auto Power OFF utility (the
Clock symbol will switch OFF). To enable the Auto Power OFF utility, repeat this process.
Press the LUX/FC button to toggle between Lux and FC (foot‐candles) measurement units.
1. Short press the "MAX/MIN" button and the meter will begin to track the
maximum/average/minimum measurements; the "MAX" icon will display at the top of the
LCD window indicating that the meter is now showing the maximum reading. The reading
will not change until a higher reading is registered.
2. Press the "MAX/MIN" button again to switch from "MAX" to "AVG", where the meter will
show the average measurement value. The "AVG" icon will be displayed above the displayed
value.
3. Press the "MAX/MIN" button again to change the mode from "AVG" to "MIN", where the
meter will show the minimum value measured. The "MIN" icon will be displayed.
4. Press the "MAX/MIN" button again to switch from "MIN" back to "MAX".
5. To exit this mode, hold the "MAX/MIN" button for at least 2 seconds. The MAX/AVG/MIN
icons should all be switched OFF when the unit returns to the normal operating mode.
Press the HOLD button to freeze the current reading on the LCD. Press the HOLD button again to
release the reading. In the Data Hold mode, HOLD is displayed on the LCD.
1. Ensure that the protective cap is attached to the light sensor.
2. Power the meter and the LCD should display '0'.
3. Short press the "CAL ZERO" button to perform the zero adjustment (CAL will appear on the
display).
4. The CAL display will switch off when the calibration has been completed.
5. If the protective cap is not covering the sensor when the Zero calibration is started the LCD
display will read CAP. In this case, please cover the sensor with the cap and restart this
procedure.
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