Tenmars TM-720 User Manual

LUX/FC Light Meter

TM-720

User’s manual

HB2TM720MI01

TENMARS ELECTRONICS CO., LTD

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

1. Description

TM-720

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 ~ ℃

40 , 0%~ 80%RH.℃

 Storage Temperature & Humidity:

1

-10 ~ ℃ 60 , 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 =

TM-720

──────────────

Nbr. of Lumen=Nbr. of foot (or meter)x area

Nbr. of Lumen

Area(sq. foot or sq. meter)

2

4. Features

 Overload Indication: LCD screen will show

“OL” on the upper left-hand corner.

TM-720

 Low battery Indication "
 Sampling Rate: 2.5 times per second for

digital display.

 Spectral response close to CIE luminous

spectral efficiency.

 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.

".

3

5. Specifications

TM-720

Display
Sensor Silicon photodiode and filter

Measuring
Range

Accuracy

Angle deviation
from cosine
characteristics

Power Supply
Battery life About 200 hours

Dimensions
Weight 250g (include battery)

Accessories

4000 count, maximum display
3999

400,4000, 40000,400000 Lux
40,400,4000,40000 Footcandles

±3% ±3Lux(0~500Lux), ±3%(up
501 Lux) (Calibrated to standard

incandescent lamp 2856°K)
8% other visible light source

30°

60 °

°

80

2 batteries 1.5V AAA MN2400
LR03 AM4

133(L)x48(W)x23mm(L) Hmm

5.3(L)x 1.9(W) x0.2(L) inch

User’s manual, carrying case,

1.5V battery*2

±2%
±6%

±25%

4

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-720

5

TM-720

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.

6

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-720

7

)

TM-720

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 .

Typ. Ta=23℃

100

90
80
70
60
50
40
30
20

10

0

380 440 500 560 620 680 740

RELATIVE SENSITIVITY (%)

WAVELENGTH (nm

＊CIE luminous spectral luminous

8

V(λ)

TM-720

＊

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.

TM-720

 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.

9

TM-720

10 Recommended Levels of

Illumination

Suitable levels of illuminance
(According to the JIS standard Z 9110-1979)

 Offices

Illuminance (lux) Place

1500 to 750
750 to 300
300 to 100

75 to 30 Indoor emergency stairways

 Factories

Illuminance (lux) Place

3000 to 1500

1500 to 750

750 to 300
300 to 150 Wrapping and packing

75 to 30 Indoor emergency stairways

Offices, designing, drawing
rooms

Offices, conference rooms,
computer rooms

Workrooms, corridors,
stairways, restrooms

Where such work as
assembling, inspecting testing,
selecting, extremely precision
visual work
Assembling, inspecting,
testing, selecting, precision
visual work
Assembling, inspecting,
testing, selecting and visual
ordinary work

10

 Schools

Illuminance(lux) Place

TM-720

1500 to 300

750 to 200

Precision drawing or drafting,
precision experimenting, library

Classrooms, library reading
rooms, staff rooms, gymnasia

Lecture halls, assembly rooms,

300 to 75

locker rooms, corridors,
stairways and restrooms

75 to 30

Warehouses and emergency
stairways

10 to 2 School passages

11

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.

TM-720

12. END OF LIFE

Caution : this symbol indicates

that equipment and its accessories
shall be subject to a separate
collection and correct disposal

12

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r

Our products of high quality are selling

well all over the world

TENMARS ELECTRONICS CO., LTD

6F, 586, RUI GUANG ROAD, NEIHU,

TAIPEI 114, TAIWAN.

E-mail : [e-mail]

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