USER MANUAL LUX/FC Light Meter Model LT505 Additional User Manual Translations available at www.extech.
Introduction Thank you for selecting the Extech Model LT505 LUX/FC Light Meter. The LT505 measures light from fluorescent, metal halide, high-pressure sodium and incandescent sources in lux and footcandles. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version and translations of this User Manual, Product Updates, Product Registration, and Customer Support.
1. Battery status 2. Auto Power OFF (APO) 3. Data Hold 4. Maximum reading 5. Average reading 6. Minimum reading 7. Measurement 8. Units of measure 9. Calibration (ZERO) Operation Meter Power Power the meter by long pressing the button. The meter will begin displaying light intensity readings. If the LCD does not switch on, check the batteries located in the rear battery compartment. Short press power button to turn OFF the meter. Zero Calibrate the Sensor 1. 2. 3. 4. 5. 6.
MAX/MIN Button The meter records the maximum, minimum, and average readings as described below: 1. Short press the button and the meter will begin tracking the maximum, average, and minimum measurements. The MAX icon will display at the top of the LCD indicating the meter is now showing the maximum reading. The reading will not change until a higher reading is registered. 2. Short press the button again to switch from MAX to AVG, where the meter will show the average measurement value.
Maintenance Battery Replacement 1. 2. Power OFF the meter. Press the button that secures the battery compartment at the back of the meter while sliding the battery compartment cover off in a downward motion. 3. Replace the two (2) ‘AAA’ batteries observing correct polarity. 4. Re-assemble the meter before use. Safety: Please dispose of batteries responsibly; never dispose of batteries in a fire, batteries may explode or leak.
Specifications Display 9999 count LCD Sampling rate 2.5 times per second Light sensor Silicone photodiode with cosine correction filter Measurement Units LUX and FC (Foot candles) Lighting source types Fluorescent, metal halide, high-pressure sodium, and incandescent Input Overload Display ‘OL’ Tripod mount On back of meter Power 2 x 1.5V AAA batteries Low battery indicator included Automatic power off After approx.
Electrical Specifications (23±5°C) Lux (autorange) Unit Range Resolution Accuracy Lux 999.9 0.1 ±3%rdg + 3 dgts 9 999 1 99 990 10 400 000 100 ±3%rdg +10 dgts Foot-candle (autorange) Unit Range Resolution Accuracy fc 99.99 0.01 ±3%rdg + 3 dgts 999.9 0.1 9 999 1 40 000 10 ±3%rdg +10 dgts Note: All ranges calibrated to a standard incandescent lamp at color temperature of 2856°K 7 LT505-en-GB_V1.
Appendices Typical Light Levels (1 Fc = 10.
