Extech Instruments EA30 Manual de usuario

User's Guide

EasyView Digital Light Meter

Model EA30

EA30 V2.0 06/062

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 to 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 www.extech.com for contact

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.

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.

EA30 V2.0 06/063

Specifications

Ranges and Resolution Accuracy

Lux

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

±( 4% Rdg + 0.5%FS, if > 10,000 lux)

Foot candles

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

±( 4% Rdg + 0.5%FS, if > 1,000 fc)

General Specifications

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

Over range indication LCD displays ‘OL’

Spectral response CIE photopic (CIE human eye response curve)

Spectral accuracy CIE Vfunction (f1 ï 6%)

Measurement Repeatability±2%

Temperature coefficient ±0.1% per oC

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

display)

Photo detector Silicon photo-diode with spectral response filter

Peak hold Capture light peaks to 100uS

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 33mm)

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

Low battery indication “BT” appears on the LCD

Power supply 6 ‘AAA’ cells; Battery life approx 400 hours

EA30 V2.0 06/064

Meter Description

1. LCD display

2. Range button

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

9. MAX/MIN button

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.

EA30 V2.0 06/065

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.

EA30 V2.0 06/066



Support line (781) 890-7440

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

Repair & Returns: Extension 210; E-mail: [email protected]

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

Extech Instruments Corporation,285 Bear Hill Rd., Waltham, MA 02451

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 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.

EA30 V2.0 06/067

Appendix

Typical Light Levels

Lux Foot

Candles Lux Foot

Candles

Factories Home

20-75 2-7 Emergency Stairs, Warehouse 100-150 10-15 Washing

75-150 7-15 Exit/Entrance Passages 150-200 15-20 Recreational

Activities

150-300 15-30 Packing Work 200-300 20-30 Drawing Room,

Table

300-750 30-75 Visual Work: Production Line 300-500 30-50 Makeup

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

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

Office Restaurant

75-100 7-10 Indoor Emergency Stairs 75-150 7-15 Corridor Stairs

100-200 10-20 Corridor Stairs 150-300 15-30 Entrance,

Wash Room

200-750 20-75 Conference,

Reception Room 300-750 30-75 Cooking Room,

Dining Table

750-1,500 75-150 Clerical Work 750-1,500 75-150 Show Window

1,500-2,000 150-2000 Typing, Drafting

Store Hospital

75-150 7-15 Indoors 30-75 3-7 Emergency Stairs

150-200 15-20 Corridor/Stairs 75-100 7-10 Stairs

200-300 20-30 Reception 100-150 10-15 Sick Room,

Warehouse

300-500 30-50 Display Stand 150-200 15-20 Waiting Room

500-750 50-75 Elevator 200-750 20-75 Medical Exam

Room

750-1,500 75-150 Show Window,

Packing Table 750-1,500 75-150 Operating Room

1,500-3,000 150-300 Storefront, Show Window 5,000-10,000 500-1000 Eye Inspection

Spectral Sensitivity

400 450 500 550 600 650 700

Wavelength (nm)

- - - - - Light Meter Response _____ CIE Response

0.8

0.6

0.4

0.2

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