General Specifications - Extech Instruments LT40 User Manual

Specifications
General Specifications
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Units Range
999.9
Lux
9,999
99,990*
400,000*
99.99
999.9
Foot
candles
9,999
40,000*
* Readings above 9999 use a x10 or x100 multiplier (1 Fc = 10.76 Lux)
Angle deviation from cosine
characteristics
Sampling rate 2.5 times per second (digital display)
Photo detector Silicon photo‐diode with cosine correction
Display 4 ‐digit LCD (maximum display: 9999) with low battery icon,
measurement overload, and other function indicators
Auto Range M eter automatically ranges the display
Operating conditions Temperature: 5 to 40
Storage conditions Temperature: ‐10 to 60
Low battery indication
LED Type White LED light
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 133 x 48 x 23 mm (5.2 x 1.9 x 0.9")
Weight 250 g. (8.8 oz.) including batteries
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Resolution
0.1
White LED:
1
±(3%reading + 3 Lux) up to 500 Lux
10
±(3%reading) >500 Lux
Other light sources: Unspecified
100
0.01
White LED:
0.1
±(3%reading + 0.3 Fc) up to 46 Fc
±(3%reading) >46 Fc
1
Other light sources: Unspecified
10
30°
60°
80°
o o
C (41 to 104 F); Humidity: < 80% RH
o o
C (14 to 140 F); Humidity: < 70% RH
appears on the LCD when battery voltage falls critically low
6
Accuracy
±2%
±6%
±25%
LT40-en-GB_V3.0 10/17
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