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Summary of Contents for Extech Instruments 401025
- Page 1 USER MANUAL Model 401025 Digital Light Meter...
- Page 2 Introduction Congratulations on your purchase of the Extech Digital Light Meter. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website Customer (www.extech.com) to check for the latest version of this User Manual, Product Updates, and Support.
- Page 3 Range Display Multipliers Range Units Multiplier Direct reading 2000 Fc & Lux Direct reading 5000 Reading x10 20,000 Reading x10 50,000 Reading x100 Using the range and unit selector switches. The switch on the left selects the range. The switch on the right selects the unit.
- Page 4 Replacing the Battery When the LO BAT icon appears, replace the battery promptly. Open the rear battery compartment and remove the old battery. Replace with a new 9V battery (observing correct polarity). Secure the battery compartment before use. Safety: Please dispose of batteries responsibly and in accordance with all applicable laws and regulations;...
- Page 5 Frequency Spectrum Wavelength Appendix A - Typical Light Levels Foot Foot Candles Candles Factories Home 20-75 Emergency Stairs, 100-150 10-15 Washing Warehouse 75-150 7-15 Exit/Entrance Passages 150-200 15-20 Recreational Activities 150-300 15-30 Packing Work 200-300 20-30 Drawing Room, Table 300-750 30-75 Visual Work: Production 300-500...
- Page 6 Appendix B - Common Terms and Conversion Factors Illuminance (Visible Flux Density) 1 lm/m 2 = 1 lux (lx) 10 -4 lm/cm 2 10 -4 phot (ph) 9.290 x 10 -2 lm/ft 2 9.290 x 10 -2 foot-candles Luminance (Visible Flux Density per Solid Angle) 1 lm/m 2 /sr = 1 candela/m 2 Luminous Intensity (Visible Flux per Solid Angle) 1 lm/sr =...
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