Specifications - Extech Instruments LT40 User Manual

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