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
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