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
2
-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
3
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
4
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
5
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
6
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
7
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.
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