Extech EasyView EA30 Digital Light Meter User's Guide

User's Guide

EasyView Digital Light Meter

Model EA30

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this 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 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA number). 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.

Introduction

Congratulations on your purchase of the Extech EasyView Digital Light Meter which measures light level (illuminance). This device measures up to 40,000 Fc and 400,000

Lux. Careful use of this meter will provide years of reliable service.

Specifications

Ranges and Resolution

Lux

40.00, 400.0, 4000, 40.00k, 400.0kLux

Accuracy

± (3% Rdg + 0.5% FS)

±( 4% Rdg + 10 digits) if > 10,000 lux/fc)

Foot candles

40.00, 400.0, 4000, 40.00kfc ± (3% Rdg + 0.5% FS)

±( 4% Rdg + 10 digits) if > 10,000 lux/fc)

General Specifications

Display

Over range indication

Multi-function 3-3/4 (3999) digit LCD with Bargraph indicator

LCD displays ‘OL’

Spectral response CIE photopic (CIE human eye response curve)

Spectral accuracy CIE V2 function (f

1

2 6%)

Measurement Repeatability ±2%

Temperature coefficient ±0.1% per o C

Sampling rate 13.3 times per second (bargraph); 1.3 times per second (digital display)

Silicon photo-diode with spectral response filter Photo detector

Peak hold

Operating conditions

Storage conditions

Dimensions

Capture light peaks to 100uS

Temperature: 32 to 104 o F (0 to 40 o C); Humidity: < 80% RH

Temperature: 14 to 140 o F (-10 to 50 o C); Humidity: < 80% RH

5.91 x 2.8 x 1.4" (150 x 72 x 33mm)

Approx. 11.3 oz. (320g) with battery Weight

Low battery indication

Power supply

“BT” appears on the LCD

6 ‘AAA’ cells; Battery life approx 400 hours

Meter Description

3. Power ON/OFF button

4. Peak hold button

5. Lux select button

6. Photo sensor (lens cover not shown)

7. Sensor input to top of meter

8. Data HOLD button

3

4

1

2

5

6

10. fc foot candle select button

11. RELATIVE function button

Note: Battery compartment is located

on the rear of the instrument

Operation

Turn Power ON or OFF

1. Press the button to turn power on or off. The meter will perform a short self-test when turned on.

Light sensor

1. The light sensor is permanently attached to the meter. A coiled cable attaches the sensor to the meter.

2. The white domed light sensor lens is a photo diode and resides underneath the protective cap.

3. The meter automatically zeroes, therefore a zero calibration is not necessary.

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

Taking light measurements

1. Remove the protective cap from the sensor and face the white domed light sensor toward the source of light to be monitored. For overhead lighting, the sensor can be placed on a desk or table top.

2. The light being measured must encompass the entire white sensor dome.

3. Read the light level on the LCD. If the light measurement is out of range an “OL” indication will appear on the display. If the ‘OL’ appears, select another range by pressing the RANGE button.

Selecting Lux or Foot candle units of measure

Press the LUX button to select lux units and the fc button to select foot candle units.

MX MN Function (stores/recalls highest MX and lowest MN readings)

Press the MX/MN button once to put the meter in MX mode. The meter will now display only the highest reading (MX is displayed on the upper left-hand portion of the LCD). Press

MX/MN again to put the meter in MN mode where the meter displays only the lowest reading (MN icon is displayed). Press MX/MN again to have the meter continue to record the highest and lowest readings but display only the current reading (both MX and MN icons appear flashing), then use the MX/MN button to scroll through the highest and lowest readings. To exit the MX MN mode, press and hold the MX/MN button until the MX and MN icons completely disappear.

8

9

10

7

11

Data Hold

Press the HOLD button to freeze the displayed reading. The 'H' hold icon will appear on the upper right-hand side of the display. Press the HOLD button again to return to normal operation (the 'H' hold icon will disappear). When hold function is enabled the analog bar graph will continue to display level changes.

Peak Hold

The Peak Hold feature allows the meter to captures light level changes that occur in as little time as 100us. Press the PEAK button momentarily and the ‘P+’ icon will appear on the LCD. The meter can now measure a fast acting light peak and display it on the LCD.

To exit the Peak Hold mode, press and hold the PEAK button until the ‘P+’ icon disappears.

NOTE: If the PEAK button is pressed momentarily rather then pressed and held when exiting the Peak mode, the meter will display ‘P-‘ which is a function reserved for future use and should be ignored.

Relative mode

Measurements can be displayed as a difference between actual light level and a stored reference value. To store a reading as a reference, press the REL button when the desired reference measurement is on the LCD (the triangle icon will appear steady in the upper left-hand corner of the LCD). All subsequent displayed readings will be “relative” to the stored reference value. For example, if the reference value is 100 and the actual light level is 125, the meter will display 25. To view the reference value, press the REL button again so that the triangle icon begins to flash. The displayed value will be the reference value. To exit the Relative mode, press and hold the REL button until the triangle icon disappears.

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 power falls low, the ‘BT’ symbol will appear on the lower left-hand side of the LCD. 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 complete repair and calibration services for all of the products we sell.

For periodic calibration, NIST certification or repair of this Extech product, call customer service for details on services available. Extech recommends that calibration be performed on an annual basis to ensure calibration integrity.

Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: [email protected]

Website: www.extech.com

Copyright © 2002 Extech Instruments Corporation.

All rights reserved including the right of reproduction in whole or in part in any form.

Appendix

Typical Light Levels

Lux Foot

Candles

75-150 7-15

Factories

Store

Lux Foot

Candles

Home

Passages 150-200 15-20 Recreational

Activities

200-300 20-30 Drawing

Table

Visual 300-500 30-50 Makeup

750-1,500 75-150 Typesetting: Inspection Work 500-1,500 50-150 Reading,

1,500-3,000 150-300 Electronic 1,000-2,000 100-200 Sewing

Office Restaurant

75-100 7-10 Indoor Emergency Stairs

100-200 10-20

Conference,

Reception Room

150-300 15-30 Entrance,

Wash Room

Room,

Dining Table

30-75 3-7

Hospital

Emergency Stairs

75-100 7-10 Stairs

Room,

Warehouse

200-750 20-75 Medical

Room

Window,

Packing Table

1,500-3,000 150-300 Storefront, Show Window

Spectral Sensitivity

5,000-10,000 500-1000 Eye Inspection s p o n e

R e s e t i v

R e l a

0.4

0.2

0

0.8

0.6

1

400 450 500 550 600 650 700

Wavelength (nm)

- - - - - Light Meter Response _____ CIE Response