ISO-TECH Digital Illuminance Meter
3
ISO-TECH
Digital Illuminance Meter
I INSTRUCTION
The ISO-TECH 1332A Digital illuminance meter is a precision
instrument used to measure illuminance in the field.
It is fully cosine corrected for the angular incidence of light.
The illuminance meter is compact, robust and easy to use.
The light sensitive device used in the instrument is a very stable,
long life silicon diode.
ISO-TECH - 1332A
INSTRUCTION MANUAL
II
FEATURES
• Light-measuring levels ranging from 0.01 lux to 200,000 lux.
• High accuracy and rapid response.
• Data-hold function for holding measured values.
• Unit and symbol display for easy reading.
• Automatic zeroing.
• Meter corrected for Luminous Efficiency.
• Automatic correction factor for nonstandard light sources.
III SPECIFICATIONS
• Display:3-1/2 digit LCD.
• Measuring ranges:200 , 2,000 , 20,000 and 200,000 LUX
( 20,000 LUX range = reading × 10,200,000 LUX range =
reading ×100)
1
4. Data-hold button:Press the HOLD button to select HOLD mode.
IV NAME OF PARTS AND POSITIONS
When HOLD mode is selected, the illuminance meter stops all further
measurements. Pressing the HOLD button again cancels HOLD mode,
causing the illuminance meter to resume measurement.
5. Range button:Pressing the range button changes from 200 LUX,
2,000 LUX, 20,000 LUX and 200,000 LUX range sequentially.
6. Photo detector.
7. Analog D.C. output :
• Overrange display:Highest digit of "1" is displayed.
• Spectral response: CIE Photopic. (CIE human eye response curve).
• Spectral accuracy: CIE Vλ function f ’1 ≦6%
• Cosine response: f ’2 ≦2%
• Accuracy:±3﹪of reading ± 0.5﹪full-scale(±4﹪of reading ±10
digits > 10,000 lux range).
(Calibrated to a standard incandescent lamp at colour temperature of 2856
K).
• Repeatability:±2﹪.
• Temperature characteristics:±0.1﹪/ ℃.
• Measuring rate:Approximately 2 readings /sec.
• Photo detector:Silicon photo diode with filter.
• Operating temperature and humidity:
0℃ to 40℃(32℉ to 104℉)10 to 80﹪RH.
• Storage temperature and humidity:
-10℃ to 60℃(14℉ to 140℉)10 to 70﹪RH.
Power source:One 9 Volt battery, NEDA 1604 or JIS
006P or IEC 6LF22/6LR61.
• Battery life (typical):200 hours (Alkaline battery).
• Photo detector lead length:150 cm (approx.).
• Photo detector dimensions:100(L) × 60(W) × 27(H) mm,
3.94"(L) × 2.36" (W) × 1.06" (H).
• Dimensions:135(L) × 72(W) × 33(H) mm, 5.31" (L) × 2.83" (W)
×1.3" (H).
• Weight:250g (8.8oz).
• Accessories:Carrying case, instruction manual and battery.
•
2
5. Overange:If the instrument only display one "1" in the M.S.D.
position, the input signal is too strong and a higher
range should be selected.
6. Data-hold mode:Press the HOLD key to select HOLD mode.
When HOLD mode is selected, the illuminance meter stops all
further measurements. Press the HOLD key again to cancel
HOLD mode and normal operation is resumed.
7. When measurements are complete, replace the photo
detector cap and turn the power selector OFF.
VI BATTERY CHECK-UP & REPLACEMENT
DC+ on pin and intermediate connector, ground on sleeve.
8. Tilt stand. (Back)
1
1. LCD Display:3 /2 Digits with a maximum reading of 1999, and
indicating symbols for: " LUX ", Data-hold " H ", Range "20,000",
"x10" (reading × 10), "200,000", "x100" (reading × 100), Low
battery "BT", etc.
2. Range indicator:Indicates 200 LUX, 2000 LUX, 20,000 LUX, and
200,000 LUX ranges respectively.
3. Power button:The power button turns the illuminance meter on or off.
V OPERATING INSTRUCTIONS
1. Power-up:Press the power button to turn the meter on or off.
2. Selecting the lux scale: Press the range selection button to set the
desired range.
3. Remove the photo detector cap and position the sensor
perpendicular to the light source.
4. Read the illuminance value from the LCD display.
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1. When the battery power is not sufficient provide accurate
operation, the “BT” symbol will appear on the LCD indicationg the
battery requires replacement
2. After turning off the meter, press the battery cover and push in the
direction of the arrow to open (See drawing below).
3. Disconnect the battery from the instrument and replace it with a
new 9 Volt type 6LR61 battery (or equivalent), observing correct
polarity. Refit the cover.
4. Turn the instrument on and check for correct operation.
5
VII SPECTRAL SENSITIVITY CHARACTERISTIC
• The sensor device in the instrument together with its filter,
makes the spectral sensitivity characteristic very close to the
C.I.E. (INTERNATIONAL COMMISSION ON ILLUMINATION)
photopic curve V(λ ) as shown in the following chart.
1.2
1
1
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
Wavelength in Nonometers
780
760
740
720
700
680
660
640
620
600
580
560
540
520
500
480
460
440
420
0
400
0
380
Relative Sensitivity (%)
1.2
•
VIII MAINTENANCE
Light Meter
CIE
1. The white plastic disc on the top of the detector should be cleaned
with a damp cloth when necessary.
2. Do not store the instrument where temperature or humidity is
excessively high.
3. The sensor reference level, as marked on the display unit
face-plate, is the tip of the photo detector globe.
4. The calibration interval for the photo detector will vary according
to operational conditions, but generally the sensitivity decreases
in direct proportion to the product of luminous intensity and the
operational time. In order to maintain the basic accuracy of the
instrument, periodic calibration is recommended.
•
IX RECOMMENDED ILLUMINATION
LOCATIONS
• OFFICE
Conference, Reception room.
Clerical work
Typing drafting
• FACTORY
Packing work, Entrance passage
Visual work at production line
Inspection work
Electronic parts assembly line
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6
•
Lux
•
200
700
1000
~
~
~
750
1,500
2,000
150
300
750
1500
~
~
~
~
300
750
1,500
3,000
HOTEL
Public room, Cloakroom
100
~
200
Reception, Cashier
200
~
1,000
STORE
Indoors stairs corridor
150
~
200
Shop window, Packing table
750
~
1,500
Forefront of shop window
1500
~
3,000
HOSPITAL
Sickroom, Warehouse
100
~
200
Medical examination room
300
~
750
Operating room
Emergency treatment
750
~
1,500
SCHOOL
Auditorium, Indoor gymnasium
100
~
300
Classroom
200
~
750
Laboratory, Library, Drafting room
500
~
1,500
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