Extech Instruments LT40 User Manual

LT40-EU-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23
o
C
±8%forothervisiblelightsources
30

±2%
60

 ±6%
Angledeviationfromcosine
characteristics
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:5to40
o
C(41to104
o
F);Humidity:<80%RH
Storageconditions Temperature:‐10to60
o
C(14to140
o
F);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 133x48x23mm(5.2
x1.9x1”)
Weight 250g.(8.8oz.)includingbatteries

Extech Instruments LT40 Specifications

General

Brand	Extech Instruments
Model	LT40
Category	Measuring Instruments
Language	English