Extech EA31 Operating Manual

User's Guide

EasyView Digital Light Meter

Model EA31

Introduction

Congratulations on your purchase of the Extech EasyView Digital Light Meter
which measures the amount of light falling on a surface (illumin ance) in Foot­candles or Lux. This device measures up to 20,000 F c and 20,000 Lux. Careful
use of this meter will provide years of reliable service.

Specifications

Units Ranges and

Accuracy

Resolution

Lux 20.00, 200.0, 2000,

20.00kLux

± (3% rdg + 0.5% FS)

±( 4% rdg + 0.5% FS, if > 10,000lux or

Foot-candles 20.00, 200.0, 2000,

1,000fc)

20.00kfc

General Specifications

Display 3-1/2 digit, 2000 count LCD
Over range indication LCD displays ‘OL’
Spectral response CIE photopic (CIE human eye response curve),

Cosine corrected

Spectral accuracy CIE V function (f’

ï 6%)

1

Measurement Repeatability ±2%
Calibration Calibrated to a standard incandescent lamp at

color temperature 2856ºK

Temperature coefficient ±0.1% per

o

C
Sampling rate 2.5 times per second
Photo detector Silicon photo-diode and spectral response filter
Operating conditions Temperature: 32 to 104

o

F (0 to 40oC); Humidity: <

80% RH

Storage conditions Temperature: 14 to 140oF (-10 to 50oC); Humidity:

< 80% RH
Dimensions 5.91 x 2.8 x 1.4" (150 x 72 x 35mm)
Weight Approx. 11.3 oz. (320g) with battery
Photo Detector Dimensions 3.62 x 2.36 x 1.14” (92 x 60 x 29mm)
Detector cable length 3’ (91cm) approximately
Low battery indication “BT” appears on the LCD
Power supply 6 ‘AAA’ cells; Battery life approx 400 hours

EA31 V2.0 06/06 2

Meter Description

1. LCD display

2. Range button

3. Power ON/OFF button

4. lux / fc selection button

5. Data HOLD button

6. MAX/MIN button

7. Photo sensor (lens cover not shown)
(Tripod mount on rear of sensor)

Note: Battery compartment is located

on the rear of the instrument

Spectral Sensitivity

EA31 V2.0 06/06 3