Tenmars TM-721 User manual

LUX/FC Light Meter
TM-721
User’s manual
HB2TM72
1000
1

CONTENTS
1. Description.................................................... 1
2. Safety Precaution ......................................... 1
3. Preface ......................................................... 2
4. features......................................................... 3
5. Specifications................................................ 4
6. Operation...................................................... 5
6.1. LUX/FC button:................................... 5
6.2. CAL/ZERO button:.............................. 5
6.3. MAX/MIN/AVG Button:........................ 6
6.4. Data Hold button:................................ 6
6.5. power button:...................................... 6
6.6. auto power:......................................... 6
6.7. Enable/disable auto power off ............ 6
7. Instrument Description.................................. 7
8 Relative SPECTRAL (Sensitivity).................. 8
10 Recommended Levels of Illumination......... 10
11 Battery Replacement .................................. 12
12.End of life.................................................... 12

TM-721/TM-720
1
1. Description
Measures light from visible luminaries equipped
fluorescent, metal halide, high-pressure sodium
and incandescent sources.
2. Safety Precaution
CAUTION
Be extremely careful for the following
conditions while measuring
Do not operate the meter under the
environment with explosive gas (material),
combustible gas (material) steam or filled with
dust.
In order to avoid reading incorrect data,
please replace the battery immediately when
the symbol " " appears on the LCD.
In order to avoid the damage caused by
contamination or static electricity, do not
touch the circuit board before you take any
adequate action.
Operating Environment: Indoors use. This
instrument has been designed for being used
in an environment of pollution degree 2.
Operation Altitude: Up to 2000M.
Operating Temperature & Humidity: 5°C ~
40°C, 0%~ 80%RH.
Storage Temperature & Humidity:

TM-721/TM-720
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-10°C ~ 60°C, 0%~ 70%RH.
EMC: EN61326-1(2006),
IEC 61000-4-2(2008, IEC 61000-4-3(2006) +
(2007).
3. Preface
The flux of light received in a unit area of a
certain side being shown is popularly known as
illumination. The measuring unit in both United
Kingdom and America is known as footcandles
light, but in Europe it is also known as meter
candlelight.
One foot-candles light is the illumination of light
that falls on one side which is one foot away from
a one foot-candlelight and exactly intersecting
with the light. Its abbreviated form is written as 1
Fc=1 Lm/ft, similarly, one-meter candlelight is the
illumination of light that falls on a side which is
one meter away from a one meter candlelight and
exactly intersecting the light. It is also called Lux
i,e. the flux of light being received in each sq.
meter is called the illumination of one lumen.
1 FC=10.764 LUX, 1 LUX=0.09290 FC,
therefore,Nbr. of foot (meter) candlelight =
Nbr. of Lumen
――――――――――――――
Area(sq. foot or sq. meter)
Nbr. of Lumen=Nbr. of foot (or meter)x area

TM-721/TM-720
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4. Features
Overload Indication: LCD screen will show
“OL” on the upper left-hand corner.
Low battery Indication " ".
Sampling Rate: 2.5 times per second for
digital display.
Cosine Angular corrected.
According to JIS C 1609:1993 and CNS 5119
general A class Specifications.
Measuring lights source: all the visible light.
Measuring intensities of illumination in Lux or
footcandles.
Many applications include: Warehouses,
factories, office buildings, restaurants, schools,
library, hospitals, photographic, many video,
parking garages, museums, art galleries,
stadiums, building security.
Data hold.(HOLD)
Maximum/Average/Minimum Hold.(MAX/MIN)
Zero adjustment.(ZERO)
Auto power off and disable function.
Auto ranging.

TM-721/TM-720
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5. Specifications
Display 9999 count, maximum display
9999
Sensor Silicon photodiode and filter
Measuring
Range
999.9,9999, 99990,400000 Lux
99.99,999.9,9999,40000
Footcandles
Resulation 0.1,1, 10,100 Lux
0.01,0.1,1,10 Footcandles
Accuracy
±3% ±3Lux(0~500Lux), ±3%(up
501 Lux) (Calibrated to standard
incandescent lamp 2856°K)
±8% other visible light source
Angle deviation
from cosine
characteristics
30°±2%
60 °±6%
80 °±25%
Power Supply 2 batteries 1.5V AAA MN2400
LR03 AM4
Battery life About 200 hours
Dimensions 133(L)x48(W)x23 mm (H)
5.3(L)x 1.9(W) x0.2(H) inch
Weight 250g (include battery)
Accessories User’s manual, carrying case,
1.5V battery*2

TM-721/TM-720
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6. Operation
6.1. LUX/FC Button:
Select LUX/FC.
6.2. CAL/ZERO Button:
Calibration of 1000 LUX:
1. Prepare the 2856 °K /1000 Lux light
source.
2. Press CAL button and POWER button
more than 2 second the LCD will display
CAL.
3. Unlocks buttons.
4. Press CAL button again more than 2
second the meter will shut down.
5. Correct succeed.
ZERO Button:
Press the “ZERO” button for the zero
adjustment if any digits appear on the LCD
screen, when the light sensor cap is not
attached “CAP” will be shown on the screen.
Make sure that it is attached to the light
sensor.

TM-721/TM-720
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6.3. MAX/MIN/AVG Button:
Press “MAX/MIN” button simultaneously
Lockup data maximum and average and
minimum value of measure data. Press the
“MAX/MIN” button for more than 1 second to
disable this feature.
6.4. Data Hold Button:
Freezes the reading present on the LCD
screen at the moment the button is pressed.
6.5. Power Button:
Press the ” ” button more than 2
second to power on the meter.
6.6. Auto Power:
To save battery life, the meter powers down
automatically after approximately 12
minutes of inactivity.
6.7. Enable/Disable Auto Power Off
Power Off by pressing the ” ” button
more than 2 second the LCD “ ” symbol
will disappear or enable.

TM-721/TM-720
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7. Instrument Description
1. Photo detector cover.
2. Photo detector.
3. Display (LCD).
4. Lux/Fc button.
5. Calibration and ZERO button.
6. Data hold button.
7. Maximun/Average/minimum button.
8. Power Button: ON/OFF.

TM-721/TM-720
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8 RELATIVE SPECTRAL (SENSITIVITY)
The deviation from the comparative standards
for luminosity is determined by JIS standard C
1609-1993.
Peak sensitivity wavelength: 550 nm .
＊CIE luminous spectral luminous
0
10
20
30
40
50
60
70
80
90
380
440
500
560
620
680
740
V(λ)＊
TM-721
100
RELATIVE SENSITIVITY (%)
Typ. Ta=23
℃
WAVELENGTH (nm)

TM-721/TM-720
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9 Attention
Set for referring the testing of source of light
is located at the right top end (0 degree) of
the light sensor ball plane.
When the meter is not in use, please keep
the cap of the light sensor in its place to
avoid the photo diode from wearing out.
When it is not in use for a long time, please
take the batteries away. And avoid keeping
it in a place of high temperature and
humidity.

TM-721/TM-720
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10 Recommended Levels of
Illumination
Suitable levels of illuminance
(According to the JIS standard Z 9110-1979)
Offices
Illuminance
(lux)
Place
1500 to 750
Offices, designing, drawing
rooms
750 to 300 Offices, conference rooms,
computer rooms
300 to 100
Workrooms, corridors,
stairways, restrooms
75 to 30 Indoor emergency stairways
Factories
Illuminance
(l
ux)
Place
3000 to 1500
Where such work as
assembling, inspecting testing,
selecting, extremely precision
visual work
1500 to 750
Assembling, inspecting,
testing, selecting, precision
visual work
750 to 300
Assembling, inspecting,
testing, selecting and visual
ordinary work
300 to 150 Wrapping and packing
75 to 30 Indoor emergency stairways

TM-721/TM-720
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Schools
Illuminance(lux) Place
1500 to 300 Precision drawing or drafting,
precision experimenting, library
750 to 200 Classrooms, library reading
rooms, staff rooms, gymnasia
300 to 75 Lecture halls, assembly rooms, locker rooms, corridors,
stairways and restrooms
75 to 30 Warehouses and emergency
stairways
10 to 2 School passages

TM-721/TM-720
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11 Battery Replacement
WARNING
If the symbol ” ” appears on the
LCD, please replace the battery
immediately
1. Remove the battery cover
2. Replace the battery.
3. Install the battery cover.
12. END OF LIFE
Caution : this symbol indicates
that equipment and its accessories
shall be subject to a separate
collection and correct disposal

TENMARS ELECTRONICS CO., LTD
6F, 586, RUI GUANG ROAD, NEIHU,
TAIPEI 114, TAIWAN.
E-mail : [email protected]
http : //www.tenmars.com
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