Extech Instruments EasyView EA31 Manuale utente

User's Guide

EasyView Digital Light Meter

Model EA31

EA31-EU-EN-V2.1-6/12

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.

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 mounts on rear of sensor)

Note: Battery compartment is located

on the rear of the instrument

Spectral Sensitivity

EA31-EU-EN-V2.1-6/12

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-EU-EN-V2.1-6/12

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

Full moon

Foot-candle / Lux conversion

1 lux = .09290 foot-candles

1 foot-candle = 10.764 lux

EA31-EU-EN-V2.1-6/12

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.

You, as the end user, are legally bound (Battery ordinance) to return all used

batteries and accumulators; disposal in the household garbage is prohibited!

You can hand over your used batteries / accumulators at collection points in your

community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the

device at the end of its lifecycle

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,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: 0 to 40oC (32 to 104o; Humidity: < 80% RH

Storage conditions Temperature: -10 to 50oC (14 to 140oF); Humidity: < 80% RH

Dimensions 150 x 72 x 35mm (5.91 x 2.8 x 1.4")

Weight Approx. 320g (11.3 oz) with battery

Photo Detector Dimensions 92 x 60 x 29mm (3.62 x 2.36 x 1.14”)

Detector cable length 91cm (3’) approximately

Low battery indication “BT” appears on the LCD

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

www.extech.com

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