User Manual

LT40-EN v1.3 9/13
7
Specifications
Display
4-digit LCD (maximum display: 3999) with low battery icon,
measurement overload, and other function indicators
Sensor (detector)
Silicon photodiode with spectral response filter and cosine
correction
Ranges and Resolution
Lux: 399.9, 3999, *39 999, *399 999
Foot-candles: 39.99, 399.9, 3999, *39 999
* Readings above 3999 use a x10 or x100 multiplier
(1 Fc = 10.76 Lux)
Auto-Range
The meter automatically ranges the display
Accuracy
± (3% of reading + 3 digits) up to 500 Lux
± (3%) above 500 Lux
Calibrated to standard incandescent lamp 2856
o
K at an
ambient temperature of 73
o
F (23
o
C)
±8% for other visible light sources
Angle deviation from cosine
characteristics
30
○
±2%
60
○
±6%
80
○
±25%
General Specifications
Sampling rate 2.5 times per second (digital display)
Photo detector Silicon photo-diode with spectral response filter and cosine
correction
Operating conditions Temperature: 41 to 104
o
F (5 to 40
o
C); Humidity: < 80% RH
Storage conditions Temperature: 14 to 140
o
F (-10 to 60
o
C); Humidity: < 70% RH
Low battery indication “ ” appears on the LCD when battery voltage falls critically low
LED Type White LED light can be accurately measured
Power supply 2 x 1.5V ‘AAA’ batteries
Battery life Approximately 200 hours
Auto Power OFF Meter switches OFF after 12 minutes of inactivity
Dimensions 5.2 x 1.9 x 1” (133 x 48 x 23 mm)
Weight 8.8 oz. (250g) including batteries