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Summary of Contents for Triplett LT75
- Page 1 User Manual LT75 Lux/Fc Light Meter Introduction Thank you for selecting the Triplett LT75 LUX/FC Light Meter. The LT75 measures light from fluorescent, metal halide, high-pressure sodium and incandescent sources in lux and foot-candles.
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Page 2: Meter Description
Safety Please read the entire User Manual before operating this device. Use the meter only as specified and do not attempt to service or open the meter housing. Do not use the meter in the presence of explosive gas or vapor Do not expose the meter to extremes in temperature or to high humidity Please dispose of batteries and meter responsibly and in accordance with all applicable laws and regulations... -
Page 3: Lcd Description
LCD DESCRIPTION 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) Function Indicator Operation Meter Power Power the meter by long pressing the button. -
Page 4: Taking Measurements
If the protective cap is not covering the sensor when the button is pressed, the LCD display will read “CAP”. In this case, please cover the sensor with the cap and restart this procedure. It is recommended that the meter be switched off and then on again when repeating the zero calibration function. -
Page 5: Auto Power Off (Apo)
Short press the button to step through MAX-AVG-MIN readings. To exit this mode, long press the button. The MAX/AVG/MIN display icons will switch off, and the meter will return to normal operating mode. Auto Power OFF (APO) In order to conserve battery life, the meter will automatically shut off after approximately 12 minutes of inactivity. -
Page 6: Maintenance
Maintenance Battery Replacement 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. Replace the two (2) ‘AAA’ batteries observing correct polarity. Re-assemble the meter before use. -
Page 7: Specifications
Specifications Display 9999 count LCD Sampling rate 2.5 times per second Silicone photodiode with cosine correction Light sensor filter Measurement Units LUX and FC (Foot candles) Lighting source Fluorescent, metal halide, high-pressure types sodium, and incandescent Input Overload Display ‘OL’ Tripod mount On back of meter Power... - Page 9 Typical Light Levels (1 Fc = 10.76 Lux) Foot Foot Candles Candles Factories Home 20-75 Emergency Stairs, 100-150 10-15 Washing Warehouse Exit/Entrance 75-150 7-15 Passages 150-200 15-20 Recreational Activities 150-300 15-30 Packing Work 200-300 20-30 Drawing Room, Table Visual Work: 300-750 30-75 Production...
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Page 10: Spectral Sensitivity
Triplett / Jewell Instruments extends the following warranty to the original purchaser of these goods for use. Triplett warrants to the original purchaser for use that the products sold by it will be free from defects in workmanship and material for a period of (1) one year from the date of purchase.
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