Meter Description; Operation - Extech Instruments 401025 User Manual

Introduction
Congratulations on your purchase of Extech's Digital Light Meter. This professional meter, with proper
care, will provide years of safe reliable service.

Meter Description

1. LCD Display
2. Data Hold Switch
3. Power Off/Range Switch
4. Analog Output Terminal
5. Battery Compartment (rear)
6. LUX/Fc Switch & Response Switch
7. Light Sensor
8. Zero adjust

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
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
2000 Fc & Lux
5000 Fc
20,000 Lux
50,000 Lux
Example: If a measurement on the 5000 Fc range displays 350, then the actual measured value
is; 350 X 10 = 3500 Fc.
Multiplier
Direct reading
Direct reading
Reading x10
Reading x10
Reading x100
". If this occurs, switch to a higher range.
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Lux
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