Tenmars TM-721 User manual

LUX/FC Light Meter

TM-721

User’s manual

HB2TM72

1000

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. 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

-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

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

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

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

6.3. 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. 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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