Extech Instruments EasyView EA33 Manuel utilisateur

User Manual

EasyView Light Meter with Memory

Model EA33

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EA33-en-GB_v2.5 7/18

Introduction

Congratulations on your purchase of the Extech EA33 EasyView Light Meter which measures light

level (luminance). This device measures up to 99,990 Fc and 999,990 Lux and stores up to 50

readings for easy recall. Careful use of this meter will provide years of reliable service.

Meter Description

1. Light measurement display

2. Timer display

3. TIME button

4. HOLD button

5. Unit of measure button (Fc/lux)

6. Enter button

7. Luminous Intensity (cd) / Comparator button

8. READ / Right arrow button

9. Average reading tally display

10. Power ON/OFF button

11. Set button

12. Average button

13. Relative / Percent button

14. Light sensor

15. Left arrow / Memory button

16. Up / Down arrow buttons

Display

1. Relative Mode

2. Comparator Mode

3. Average

4. Data Hold

5. % Relative

6. Candela

7. % Relative

8. fc/lx-hours Integral Illuminance

9. Stray light measurement

10. Time Hold measurement

11. ft/m luminance intensity distance

12. Day-Hour minute-seconds

13. Memory Read

14. Memory location

15. Average Reading tally display

16. Integration cycles

17. Low battery

18. Elapsed time indicator

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Basic Operation

1. With the sensor cover in place, press the button to turn the meter on. The meter will perform

a short self-test.

2. Remove the and place the sensor in the

area to be measured.

3. Press the lux / fc button to select the desired units of measure.

4. Read the light level on the display. If the measurement is out of

range, ation will appear.

5. When the meter is turned on, the elapsed timer starts. The elapsed

timer shows days/hours or minutes/seconds. Use the TIME button

to toggle the view between minutes/seconds (M-S) and days/hours (D-H).

Operation Modes

In addition to the normal mode of operation where light level is measured, there are 5 special

modes, listed below. Each mode is explained in the subsequent sections of this manual. The SET

button is used to access the modes. The number on the lower left of the LCD (after the SET button

is pressed) represents the mode currently selected. Use the down arrow key to scroll to the desired

mode.

Programming modes

Mode Name of mode Description

SEt 01 Stray+ Light Cancels out stray light from light under test

SEt 02 Time - Hold Meter measures while timer counts down.

Reading is held on LCD when counter = 0.

SEt 03 rtC Set the day and time for internal clock

SEt 04 Int Lumen-seconds, lux-hour, and fc-hour

measurements

SEt 05 COMP Measurements are compared to high and low

limits.

MODE 1 - Stray Light Inhibit

This feature allows the user to measure light from one source while

automatically factoring out the light from a secondary (stray) unwanted

source.

1. Turn on the desired li

towards this source (the stray light source should be on also).

2. Press the SET key; SEt will appear at the

center of the LCD and on the lower left of the LCD

(see diagram).

3. Press the ENTER key ( ). The measurement at this point consists of the primary AND the

stray light sources (LIGHT + STRAY).

4. Press ENTER to store this value. STRAY will appear on the display

5. Turn off the primary light source.

6. Press the ENTER key again to store only the stray light source.

7. The meter will now compute and display the light level for only the desired (primary) light source.

also appear on the display.

8. Press the ENTER key to exit this mode.

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MODE 2 Elapsed Timer with Hold

In this mode, measurements are made while the countdown timer is running. When the timer

reaches zero, the last measurement is held on the display (see diagram).

1. Press the SET key; SEt 01 will display.

2. Press the down arrow key to change to the SEt 02 parameter.

3. Press the ENTER key to call up the timer.

4. Use the up/down arrow keys to set the desired seconds.

5. Press the ENTER key to program the number of minutes.

6. Use the up/down arrow keys to set the minutes.

7. Press the ENTER key to start the countdown timer. When the timer

counts down, the last reading will be held on the display.

8. Press the ENTER key to exit this mode.

MODE 3 - Real Time Clock Setting

2. Press the d

right of the LCD.

5. Repeat the previous two steps for the minutes , hours , and day settings.

6. Press the ENTER key when finished.

7. Use the TIME key to toggle between minutes-seconds (m-s) and day-hour (D-H) views.

MODE 4 - Integral Illuminance Mode

Integral Illuminance is a luminous energy measurement based on the rate of flow of flux (expressed

in lumen-seconds). The Model EA33 can also measure any photometric quantity on a time

dependent basis. For example, the illuminance could be integrated over time to yield lux-hours (lx-h)

or foot candle-hours (fc-h).

1. Press th SEt 0

2. .

3. Press the ENTER key to start the Integral Illuminance

measurement. The meter will set the first measurement as a

reference. - - appear and the timer

will start (the cycle number appears on the lower left of the LCD).

4. If measurements exceed the reference value, the display will

Note that the timer will also

halt.

5. The maximum indication of integral illuminance is 999999. When

this maximum is exceeded, the integration number (Cycle no. at

lower left of LCD) can be checked. The maximum number of

integration cycles is 99.

6. Press the ENTER key to exit this mode of operation.

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MODE 5 - Comparator Mode

In this mode the meter compares its measurements to one HIGH and one LOW limit. When the high

limit is exceeded, the plus sign appears on the LCD. When the measurement falls below the low

limit, the negative sign appears on the LCD.

parameter.

3. Press the ENTER key to enter the Comparator setting mode.

4. Press the down arrow key to select the desired unit of measure

(Lux or Fc).

5. Press ENTER to begin setting the measurement range.

6. Use the down arrow to select the desired range.

appear.

8. Use the up/down arrow keys to set the high limit value.

9. Press the ENTER key to begin setting the Comparator LOW limit value. The minus symbol will

appear.

10. Use the up/down arrow keys to set the desired LOW limit value.

11. Press ENTER to complete the Comparator setup.

12. Press and hold the cd/COMP key for three seconds to activate the Comparator.

13. Now if a measurement exceeds the high limit, the plus sign will appear. If the low limit is

exceeded, the minus sign will appear. An audible beep will sound when a limit has been

reached.

14. Press the ENTER key to exit the Comparator mode.

99-Point Averaging

Illuminance is the amount of visible light incident upon a specific surface area. Since the EA33

sensor area is small, the Average Mode can be used to measure the illuminance of larger surface

areas; to accomplish this, up to 99 points can be averaged.

1. Press the

2. Press the MEM key to store a reading (up to 99 readings can be averaged). The display at the

lower left will keep a running tally of the readings recorded.

3. Press the READ key to perform the average calculation. The

average value will be displayed and held on the LCD.

4. Pressing the MEM key at this point allows the meter to

continuously average subsequent illuminance readings (the

display will only show an average value).

5. Use the READ button to toggle between this continuous Average

display and the normal measurement display.

6. Press the ENTER key to exit.

AVG

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Luminous Intensity Feature

Luminous intensity is the measurement of light from a light source at a known distance from the

sensor. The unit of measure is candela (cd).

1. Press the cd/COMP key to begin (for lux measurement)

feet (for Fc measurement) will appear.

2. Use the up/down arrow keys to set the distance from the light

source to the light sensor. The distance range is 0.01 to 9.99

meters or feet.

3. The measurement must be made in a dark room or in a room with

no stray light.

4. The distance between the sensor and light source must be at least

10 times the size of the light source.

5. Press the (for candela)

units icon will appear along with the reading.

6. Press the ENTER key again to exit.

Data Record/Recall

MEMORY CLEAR

1. Turn off the meter.

2. Press and hold the MEM key while turning on the meter. Release the MEM key when the

MANUAL DATA RECORD

1. Each time the MEM key is pressed with the meter turned on, a data record is recorded. The

and an audible tone will sound.

2. The counter on the lower left of the LCD will show the number of stored readings.

3. The total memory size is 50 records.

READING STORED RECORDS

1. Press the READ key to enter the

number for the displayed data point.

2. Use the up/down arrow keys to scroll through the stored readings.

3. Press the ENTER key to exit this mode of operation.

RELATIVE - % DEVIATION MODE

The meter can measure light in a relative or comparative manner.

1. Turn on the meter and select the preferred units of measure.

2. Make an initial light level measurement.

3. Press the Relative button ( / %) to enter relative mode. The display will save the first

measurement and display zero.

4. Compare a second light level to the first measurement. The difference in light level between

the first measurement and the second measurement or any additional measurements will be

displayed.

5. Press the Relative button ( / %) again to get the % deviation of light levels between the first

measurement and any additional measurements.

6. Press key exit the Relative mode.

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AUTO POWER OFF Feature

To conserve battery life, the EA33 automatically turns off after several minutes. To defeat this

feature:

1. Turn the meter OFF.

2. Press and hold the HOLD key while turning the meter ON.

3. The AUTO POWER OFF feature will now be disabled.

4. Note that AUTO POWER OFF is re-enabled each time the meter is turned on.

5. Also note that AUTO POWER OFF is always disabled in the Integral Illuminance mode.

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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 battery symbol will appear on the lower left-hand side of the

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.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate collection

sites, the retail store where the batteries were purchased, or wherever batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to

take end-of-life devices to a designated collection point for the disposal of electrical and

electronic equipment.

Specifications

Ranges Resolution Accuracy (reading)

Lux

99.99 0.01

± (3% reading + 0.5%FS) 999.9 0.1

9999 1

99990 1 ± (3% rdg + 5 digits)

999900 1 ± (3% rdg + 0.5%FS)

Foot candles

9.999 0.001

± (3% reading + 0.5%FS) 99.99 0.01

999.9 0.1

9999 1 ± (3% rdg + 5 digits)

99990 1 ± (3% rdg + 0.5%FS)

Note: Calibrated to a standard incandescent lamp at color temperature of 2856°K

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General Specifications

Display Multi-function LCD with a maximum display of 999900

Ranging Autoranging over five ranges

Over range indication

Spectral response CIE photopic (CIE human eye response curve)

Spectral accuracy V 1

Cosine response 22%; Cosine corrected for angular incidence of light

Measurement Repeatability ±2%

Temperature coefficient ±0.1% per oC

Sampling rate 5 times per second

Memory 50 manual data points

Photo detector Silicon photo-diode with spectral response filter

Operating conditions Temperature: 0 to 40oC (32 to 104oF); Humidity: < 80%RH

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

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

Detector Dimensions 92 x 60 x 29mm ( )

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

Sensor lead length 150cm ( )

Low battery indication Battery symbol appears on the LCD

Power supply

Battery life 200 hours (approx.)

ISO-9001 Certified

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Appendix

Typical Light Levels

Spectral Sensitivity

0.2

0.4

0.6

0.8

1.2

Wavelength in Nonometers

0.2

0.4

0.6

0.8

1.2

Light Meter

CIE

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