401025 Datasheet, PDF (3/6 Pages) Extech Instruments Corporation. – Digital Light Meter

Meter Description
1. LCD Display
2. Data Hold Switch
3. Power Off/Range Switch
1
4. Analog Output Terminal
2
5. Battery Compartment (rear)
6. LUX/Fc Switch & Response Switch
7. Light Sensor
8. Zero adjust
8
3
6
4
5
7
Operation
1. Select Units (Lux or Ft-candle) and Response Time (Fast or Slow) on the slide
switch. Typical selection is Slow and Fc using the gray lettering.
2. Select the maximum range on the "Range Switch"
3. Hold the "Light Sensor" so that the sensor faces the light source to be measured.
4. The Display will indicate measured values. Use a range display multiplier if on the
Lux 20,000 and 50,000 ranges or on the Fc 5000 range.
5. To "hold" a measurement, slide the "Data Hold Switch" to the "hold" position. The
reading will "freeze" in the display until the "Data Hold Switch" is released.
Note 1: An Over Range indication is a display of "I ". If this occurs, switch to a higher
range.
Note 2: For measurements made on the Fc 5000 range, the displayed reading must be
multiplied by 10.
Note 3: For measurements made on the Lux 20000 or 50000 range, the displayed
reading must be multiplied by 10 and 100 respectively.
Note 4: The meter will indicate values above the maximum ranges. The accuracy of
these measurements is unknown.
Range Display Multipliers
Range Units
200
Fc
Multiplier
Direct reading
Lux
2000
Fc & Lux Direct reading
5000
Fc
Reading x10
20,000 Lux
Reading x10
50,000 Lux
Reading x100
Example: If a measurement on the 5000 Fc range displays 350, then the actual
measured value is; 350 X 10 = 3500 Fc.
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401025 Ver. 2.1 07/05