343650 Digital Lux Meter
Nothing else measures up!
Prospect House
George Cayley Drive
Clifton Moor
York
England
YO30 4XE
Tel: +44 (0) 1904 692723
Fax: +44 (0) 1904 690385
E-Mail: [email protected]
...for secure online ordering of all our products!
Ref:.. \operat98\instructions 15\343650.qxp 05-01-15
Digital
Lux Meter
Code: 343650
Operating
Instructions
©York Survey Supply Centre 2015
Digital Lux Meter
I) Instruction
• The digital illuminance meter is a precision
instrument used to measure illuminance (lux,
footcandles) in the field.
• It meets CIE photopic spectral response.
• It is fully cosine corrected for the angular incidence
of light.
• The illuminance meter is compact, tough and easy
to handle owing to it’s construction.
• The light sensitive component used in the meter is a
very stable, long-life silicon photo diode and spectral
response filter.
II) Features
• Light measuring levels ranging from
0.01lux~0.1klux/0.01fc~0.01kfc, repeatedly.
• High accuracy and rapid response.
• Data hold function for holding measuring values.
• Unit and sign display for easy reading.
• Automatic zeroing.
• Meter corrected for spectral relative efficiency.
• Correction factor need not be manually calculated
for non-standard light sources.
• Short rise and fall times.
• Peak-hold function for tracing peak signal of light
pulse with least duration 10ms and keeping it.
• Capable of selecting measuring mode in lux or fc
scale alternatively.
• Auto power off after 30 minutes.
• Maximum and minimum measurements.
• Relative reading and reset function.
• Easy to read large backlit display.
III) Specifications
• Display: 3¾ digit LCD with high speed 42 segment
bargraph.
• Measuring range: 40.00lux, 400.0lux, 40.00klux and
400.0klux/40.00fc, 400.0fc, 4000fc and 40.00kfc
NOTE: 1fc = 10.76lux, 1klux=1000lux, 1kfc = 1000fc
• Overrange display: LCD will show “OL” symbol.
• Spectral response: CIE Photopic (CIE human eye
response curve).
• Spectral accuracy: CIE Vl function f1’<6%
• Cosine response: f2’<2%
• Accuracy: ±5%rdg±0.5%f.s.
• Repeatability: ±3%
• Sampling rate: 13.3 times/sec of analogue bar
graph indication; 1.3 times/sec of digital display.
• Photo detector: One silicon photodiode and spectral
response filter.
• Operating temperature and humidity:
0ºC to 40ºC (32ºF to 104ºF) and 0% to 80%RH
• Storage temperature and humidity:
-10ºC to 50ºC (14ºF to 140ºF) and 0% to 70%RH
• Power source: 1x 9V battery
• Photo detector lead length: 150cm (approx)
• Photo detector dimensions:
115(L) x 60(W) x 20mm(D)
• Meter dimensions: 170(L) x 80(W) x 40mm(D)
• Weight: 390g
Ref:.. \operat98\instructions 15\343650.qxp 05-01-15
• Accessories: Carry case, instruction manual, battery.
IV) Name of Parts and Positions
1
2
3
7
5
9
4
6
8
10
11
12
1. LCD Display: 3¾ digit display with a maximum
reading of 3999 and the indicating signs of
measured values, unit function symbols and
decimal points, etc. are displayed.
2. Range Selector Key: it indicates 40.00lux,
400.0lux, 4000lux, 40.00klux and
400.0klux/40.00fc, 400.0fc, 4000fc, 40.00kfc total 5
ranges for lux and 4 ranges for fc.
3. Power Control Key: The power switch key turns
the illuminance meter ON or OFF.
4. MAX/MIN Key: Maximum and minimum reading
recorder control key.
5. RESET Key: Push function reset control key.
6. BACK-LIGHT Key: Back light control key.
7. REL Key: Relative reading control key.
8. Data-Hold Key: Data hold control key.
9. Peak Hold Key: Peak hold recorder control key.
10. Lux Key: Pressing the lux key selects taking
measurement of illuminance in lux scale.
11. Fc Key: Pressing the fc key selects taking
measurement of illuminance in footcandle scale;
1 footcandle = 10.75lux.
12. Photo detector.
V) Operating Instructions
1. Power up: Press the power key to turn the meter
ON or OFF.
2. Selecting the lux or fc scale: Set the range
selection switch to desired lux or fc range.
3. Remove the photo detector cap and face it at the
light source in a horizontal position.
4. Read the illuminance nominal from the LCD
display.
5. Overrange: If the instrument only displays “OL”, the
input signal is too strong and a higher range
should be selected.
6. Data-Hold mode: Press the HOLD key to select
data-hold mode. When HOLD mode is selected,
the illuminance meter stops all further
measurements. Press the HOLD key again to to
exit data-hold mode. Normal operation is resumed.
7. Peak-Hold recorder mode: Press and hold down
PEAK key until display shows the word “CAL”,
then press PEAK key to cycle through Pmax and
Pmin recorder modes and expose the photo
detector to light pulse measuring field. Press and
hold down PEAK key 2 seconds to exit PEAK
recorder mode. Normal operation is resumed.
8. Maximum and Minimum recorder mode: Press
MAX/MIN key to cycle through Maximum (MAX)
reading, Minimum (MIN) reading and current
reading (MAX/MIN blink) recorder mode. Press
MAX/MIN key 2 seconds to exit this mode.
9. Relative reading mode: Press REL key to enter
Relative mode. The display shows zero value and
the current reading will be stored as a zero-in
value. Press again to exit this mode.
10. Reset mode: Every time this key is pressed the
active function (HOLD, MAX/MIN, REL, PEAK),
auto-power-off function and counter will be reset.
11. Back-light function: Press the Backlight key to
turn on. Press again to turn off.
12. When the measurement is completed, replace the
photo detector cap and turn the meter off.
VI) Battery Check-Up and Replacement
1. When the battery power is not sufficient, LCD will
display low battery and replacement of one new
battery is required.
2. After turning off the meter, disconnect the battery
cover with a screwdriver.
3. Disconnect the battery from the instrument and
replace it with a standard 9V battery and replace
the cover.
VII) Spectral Sensitivity Characteristic
To the detector, the applied photo diode with filters
makes the spectral sensitivity characteristic almost
meet C.I.E. (INTERNATIONAL COMMISSION ON ILLUMINATION) Photopic curve V(l) as the following
chart describes.
vary according to operational conditions, but
generally the sensitivity decreases in direct
proportion to the product of luminous intensity by
the operational time. In order to maintain the basic
accuracy of the instrument, periodic calibration is
recommended.
IX) Recommended Illumination
1fc = 10.76lux
Locations
Office
Conference/
Reception Room
Clerical Work
Factory
Visual work at
production line
Inspection Work
Electronic parts
assembly line
Hotel
Packing work,
Entrance passage
Public Room,
Cloakroom
Reception
Store
Hospital
School
VIII) Maintenance
1. The white plastic disc on 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 reference level, as marked on the face plate,
is the tip of the photo detector globe.
4. The calibration interval for the photo detector will
Typing/Drafting
Lux
200~750
fc
18~70
700~1,500
65~140
300~750
28~70
750~1,500
70~140
150~300
14~28
100~200
9~18
1,000~2,000 93~186
1,500~3,000 140~279
200~500
18~47
Cashier
750~1,000
150~200
14~18
Show Window,
Packing Table
750~1,500
70~140
Indoors Stairs
Corridor
Forefront of
Show Window
70~93
1,500~3,000 140~279
Sickroom,
Warehouse
100~200
9~18
Medical Examination 300~750
Room
28~70
Operating Room,
Emergency
Treatment
750~1,500
70~140
100~300
9~28
Classroom
200~750
18~70
Auditorium, Indoor
Gymnasium
Laboratory, Library, 500~1,500
Drafting Room
47~140
©York Survey Supply Centre 2015
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