407026 Datasheet, PDF (5/8 Pages) Extech Instruments Corporation. – Heavy Duty Meter

Operation
Meter Power and Automatic Power Off
1. Press the POWER button to turn the meter on. If the display does not switch on, check
the 9V battery.
2. Press the POWER button again to turn the meter off.
3. The meter has an automatic power off feature that conserves battery energy. After 10
minutes the meter automatically shuts off. To defeat this feature, press the RECORD
button to put the meter in the recording mode.
Display ZERO Calibration
Please perform a zero calibration before each use. This will ensure the highest accuracy.
1. Place the sensor cover over the light sensor, effectively blocking all light to the sensor.
2. Select the 2,000 LUX range using the RANGE switch.
3. Press the ZERO button. The reading should be zero.
4. Remove the sensor cover from the light sensor and proceed.
Selecting the unit of measure
Press the LUX/Fc button to select the desired unit of measure. The display icons will reflect
the current setting.
Selecting a light source
Select the type of lighting to be measured by pressing the LIGHT SOURCE button. The
display will indicate the lighting type icon (see icon list below).
L = Tungsten/Daylight (use this setting when calibrating with a Tungsten lamp)
F = Fluorescent
S = Sodium
C = Mercury
Note: For Halogen and Metal Halide light use the Tungsten setting
Taking Measurements
Hold the light sensor in the area where light is to be collected. The light being measured
must encompass the entire surface of the light sensor dome (pin point lighting such as with
LED light cannot be measured).
The display will indicate the light intensity value in LUX or Foot candles (Fc). Note that
since the main display area is limited to a reading of ‘1999’, the right-most digit in the
20,000 LUX and 5,000 Fc ranges appears on the lower LCD line. In the 50,000 LUX range,
the last two digits appear on the lower LCD line
It may be necessary to adjust the display contrast due to a change in viewing angle or
voltage drift. Use the LCD Contrast adjustment located on the right side of the meter to set
the preferred contrast.
Display Range Selection
Take a measurement starting at the highest range and then work down using the RANGE
switch. If the display shows dashes along the top of the reading area ( ), the input
exceeds the maximum value for the selected range; select a higher range. If the display
shows dashes along the bottom of the reading area ( ), the input is too low; select a
lower range.
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Model 407026 Version 2.3 January 2004