Extech Instruments Easy View Digital Light Meter Ea31 Users Manual

User's Guide

EasyView Digital Light Meter

Model EA31

EA31 V2.0 06/06 2

Introduction

Congratulations on your purchase of the Extech EasyView Digital Light Meter

which measures the amount of light falling on a surface (illuminance) in Foot-

candles or Lux. This device measures up to 20,000 Fc and 20,000 Lux. Careful

use of this meter will provide years of reliable service.

Specifications

Units Ranges and

Resolution Accuracy

Lux 20.00, 200.0, 2000,

20.00kLux

Foot-candles 20.00, 200.0, 2000,

20.00kfc

± (3% rdg + 0.5% FS)

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

1,000fc)

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’1 ï 6%)

Measurement Repeatability ±2%

Calibration Calibrated to a standard incandescent lamp at

color temperature 2856ºK

Temperature coefficient ±0.1% per oC

Sampling rate 2.5 times per second

Photo detector Silicon photo-diode and spectral response filter

Operating conditions Temperature: 32 to 104oF (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 3

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 4

Operation

Power ON or OFF

Press the button to turn power on or off.

Units of measure

Press the lux / fc button to select the unit of measure. “fc” or “lux” will appear in

the display.

Light sensor

1. The light sensor is attached to the meter with a coiled cable which allows

placement of the sensor up to approximately 3 feet from the meter.

2. The light sensor is a silicon photo diode and resides under the white domed

lens.

3. To protect the lens from scratches, keep the protective cap on the sensor

whenever the unit is not in use.

4. The back of the sensor has a tripod mounting hole.

Taking measurements

1. Remove the protective cap from the sensor.

2. Place the sensor in a horizontal position at the measurement location.

3. Read the light level on the display. If the light measurement is out of range an

“OL” indication will appear on the display. If the ‘OL’ appears, select a higher

range by pressing the RANGE button.

MX MN Function

1. Press the MX/MN button once to put the meter in MX/MN mode. The meter

will now display the highest reading that occurs while the function is enabled.

The “MAX” icon will appear in the display.

2. Press the MX/MN button again to display the lowest reading that occurs while

the function is enabled. The “MIN” icon will appear in the display.

3. Press MX/MN again to toggle between the MAX and MIN readings.

4. To exit the MX MN mode and return to the normal real time display, press

and hold the MX/MN button (2 seconds) until the MAX and MIN icons

disappear.

Data Hold

Press the HOLD button to freeze the displayed reading. The 'H' hold icon will

appear on the display. Press the HOLD button again to return to normal

operation.

EA31 V2.0 06/06 5

Reference

Foot candles Lux Typical Light Levels

>10000 >107600 Sunlight

1000 to 10000 10760 to 107600 Operating Table

100 to 1000 1076 to 10760

Assembly (fine)

Football stadium

Emergency room

Drafting table

10 to 100 107 to 1076

Overcast day

Assembly (general)

Classroom

Casual reading

Shipping area

Stairwell

Auditorium

1 to 10 10.7 to 107

ATM machine

Storage room

Building entrance

Parking lot

0 to 1 0 to 10.7

Highway

f

Full moon

Foot-candle / Lux conversion

1 lux = .09290 foot-candles

1 foot-candle = 10.764 lux

EA31 V2.0 06/06 6

Maintenance

Cleaning and storage

1. The white plastic sensor dome should be cleaned with a damp cloth when

necessary.

2. Store the meter in an area with moderate temperature and humidity (refer to

the operating and storage range in the specifications chart earlier in this

manual).

Battery Replacement

When the battery voltage is low the ‘BT’ symbol will appear on the display.

Replace the six (6) 1.5 ‘AAA’ batteries by removing the rear (center) battery

compartment screw and accessing the battery compartment. Observe polarity

when placing the batteries in the compartment. Ensure that the compartment

cover is securely fastened when finished.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Service

Department for information on calibration services available for this product.

Extech recommends that annual calibrations be performed to verify meter

performance and accuracy.

EA31 V2.0 06/06 7



Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Warranty

EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of defects in parts and

workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it

should become necessary to return the instrument for service during or beyond the warranty period, contact the

Customer Service Department at (781) 890-7440 EXTENSION 210 for authorization or visit www.extech.com for

more information. A Return Authorization (RA) number must be issued before any product is returned to

Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent

damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse,

improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.

Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not

be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or

replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or

oral, is expressed or implied.

Extech Instruments Easy View Digital Light Meter Ea31 Users Manual

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