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MT-4617 Light Intensity Meter

User’s Manual
1st Edition, 2015
©2015 Prokit’s Industries Co., Ltd
Introduction
Thank you for your purchase of the MT-4617 Light Intensity
Meter designed and manufactured by our company. This
meter will with proper use, provide years of reliable service;
therefore, it is recommended that the user read carefully the
user manual before using the light meter and keep it in right
place for reference.

Open-package inspection
Upon receipt of the light meter, inspect it to ensure no
damage happened during shipping. If the user finds obvious
damage or malfunction in operation, please contact the
supplier.

Safety information

Warning
Do not use the light meter in the environment full of
dusts or having gas substances and flammable steam
substances!
Safety mark description
This manual contains basic information for MT-4617 safety
operation and maintenance. Please read carefully following
safety information before use.
Table 1: Safety information
Important information which the user
must read before using the light
meter

Mark of conformity

1
Table 2: Warning message

It indicates that incorrect operation

will lead to serious injury or even fatal
Warning
accidents
It indicates that incorrect operation
negligence will lead to meter damage
Notice
wrong measurement results, etc.

Operation suggestions or prompts

Tips

Operation considerations

User should observe the following notices to guarantee safe

operation and obtain optimum performance.
Preliminary check
Before initial use, please check if the light meter operates
normally and if it is damaged during storage and
transportation. In case of any damage, please contact the
supplier.
Placement
-10～50℃ (14～122°F)
Operation environment
<80%RH(non-condensed)
-10～+50℃ (14～122°F)
Storage environment
<70%RH(non-condensed)

2
To avoid faults, please DO NOT place the light meter in
following environments:

3:Use

Notice
1. The operation temperature range for the light meter is
-10-50℃ (14-122°F).
2. In order to avoid damage, especially falling accidents,
handling and use should be avoided during severe
mechanical vibration.
3. The light meter can only be calibrated and repaired by
professional personnel.
4. Before each use, the opto-sensor of light meter should be
checked for damage and dust. Make sure the meter is in
good, smooth and clean condition. If one or more
functions of the light meter are irregular or not ready for
operation, avoid using the meter.
5. During the operation of the light meter, the meter
3
 measurement value should not be at OL for a long time.
6. Keep the meter out of direct sunlight to guarantee its
normal operation and long-term service life.
7. If the meter is subject to effect of intensive
electromagnetic field, its functions will be affected.
8. Only use batteries specified in technical data.
9. Batteries should avoid dampness. If the low battery
symbol appears on the display, the user should replace
batteries.
Tips
1. The sensitivity of the optical detector will be lessened
due to operation conditions or time. It is recommended to
make periodic calibration to maintain the basic accuracy.
2. Please keep original package for future mailing (such as
for light meter calibration).

Introduction

Product description
Whether you are a professional or amateur
photographer, while shooting, you pay more attention to the
surrounding illuminance rather than the setting, because
this will help you take the best shot. Although the
illuminance can be estimated by the photographer, there is
a difference in perception between human and camera
about the requirement for supplementing illuminance. This

4
difference will lead to a big contrast of the expected image
effect against the actual one. In the face of this, do you wish
to possess a light meter? When you intend to buy a house,
you require both good location and indoor brightness during
the day. So, do you wish to possess a light meter to
measure the illuminance in every corner of the house?

With the progress of human civilization, more and more

people emphasize low carbon life. Architects tend to figure
out how to bring more natural light into the house while
putting up a residential building. However, in many cases,
fluorescent lights will be used when the natural light is not
enough. In response to the slogan of energy saving and
emission reduction advocated by the state, we should use
the fluorescent lamps based on the actual needs. So, a
professional and convenient light meter can provide you
with a reference regarding illuminance.
The MT-4617 Light Intensity Meter has a friendly
human-machine interface and can be activated by a simple
press of keys. The buzzer activates upon key press to notify
that it is effective. This light meter is able to measure the
visible light produced by fluorescent lamp, metal-halide
lamp, high voltage sodium lamp or electric incandescent
lamp for a vivid and intuitive image display.
5
Outstanding features of the MT-4617 multi-function light
meter
 Automatic and manual range switching;
 Inquiry function for maximum and minimum values;
 Data hold function;
 Peak value measurement function;
 Relative value measurement function;
 Zero calibration function;
 3 1/2 bit LCD display, with analog bar display;
 Fc/Lux unit conversion function;
 Outrange indication (When the measured value
exceeds the current range, LCD will display the signal
“OL” to indicate that the range is overreached);
 High precision. Measurement range (0.00~200000Lux);
 Low battery indicator;
 Key tone and mute selection;
 Auto power-off function (The machine will be powered
off automatically keys are not operated for more than 10
minutes)
 Compact design, durable, and portable.

Name and function of components

Plan view
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1. Opto-sensor protection cover
2. Opto-sensor
3. LCD display screen
4. Compound key for main power and touch tone:
Power on/off: Short press the key to activate the
instrument and long press for 1 second to shut it down.
Touch tone on/off: Under working mode short press
the key to turn the touch tone on and off. Default is key
with tone.
5. max and min values inquiry key
6. Lux/Fc unit conversion key
7. Compound key for data hold and zero calibration:
Data hold: Short press the key to enter/exit data
hold mode.

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 Zero calibration: Long press for 1 second to perform
Zero calibration function.
8. Compound key for relative value and peak value
measurement:
Relative value measurement: Short press the key
to enter/exit relative value measurement mode.
Peak value measurement: Long press for 1 second
to enter/exit peak value measurement mode.
9. Key for manual range switching: Short press the key for
20.00Lux  200.0Lux  2000Lux  20000Lux 
200000Lux (or 20.00Fc  200.0Fc  2000Fc 
20000Fc) circulation; Long press for 1 second to
exit manual range switching mode.

LCD display interface

1. Prompt for manual range switching mode

2. Prompt for data hold mode
3. The analog bar shows the current measurement value
information.
4. The digit shows the current measurement value
information.

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5. Lux unit
6. FC unit
7. Prompt for auto measurement mode
8. Prompt for peak value measurement mode
9. Prompt for low battery
10. Prompt for relative value measurement mode
11. Prompt for max and min values inquiry

2 Measurement methods

Notices prior to measurement

Warning
1: Do not use the light meter in environments full of dusts or
having gas substances and flammable steam substances!
2: Do not use the light meter for measurement in the place
with high temperature and high humidity.
3: Do not use the light meter in environments with intense
infrared or ultraviolet rays!
Tips
1: The opto-sensor of this meter is designed by simulating
the sensitive curve of light obtained through human eyes.
The spectral coverage is between 320mm and 730mm.
When it is used for measurement within the infrared
range, there will be a large data deviation.
2: The opto-sensor is calibrated by common electric
incandescent lamp required by CIE under the color
temperature of 2854°K; the provided reading number

9
 may be different for the spectrum of other lamps.
3: The reference level of light source test is at the top of the
spherical surface illuminated.
4: The optical detector should be exposed to light for 2
minutes before measurement.
5: Influence of tester's shadow and other factors on the
optical detector should be avoided.

Action principles
Concepts of illuminance scales
One lux (lumen) indicates the illuminance from a surface of
one square meter, all points of which are one meter from a
uniform source of one candela.
One foot-candle (Fc) indicates the illuminance from a
surface of one square foot, all points of which are one foot
from a uniform source of one candela.
Unit conversion for illuminance scales
1 Fc = 10.764 Lux
1 Lux = 0.09290 Fc
Conversion formula for illuminance and light intensity
2
E=I/r
Wherein E --- illumination value (Unit: Lux)；
I --- Light intensity of the light source（Unit: cd）；
r --- Distance from the luminous surface of light source to
the optical detector (Unit: m）.

During the measurement, the minimum distance between

the luminous surface of light source and the opto-sensor
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should be more than 15 times greater than maximum size of
the luminous surface (or opto-sensor).

Typical practice cases

Remove the protection cover of the MT-4617
multi-functional light meter sensor and place it at right angle
to the light source.
Press and hold the MT-4617 power key ④ for a short time to
power on the light meter. The LCD screen will illuminate
（about 5 seconds）with the buzzer beeping twice, and
“AUTO” will appear on the middle of LCD display. This
indicates that the auto measurement mode is ON.

Press and hold the manual range switching key ⑨ of the

MT-4617 for a short time, “MANU” will appear on the top left
position of the LCD display, indicating that the manual range
switching mode has been activated. In this mode, each time
press and hold the key for a short time, the meter will switch
to20.00Lux—>200.0Lux—>2000Lux—>20000Lux—>20000
0Lux (or 20.00Fc—>200.0 Fc—>2000 Fc—>20000 Fc) in
sequence; pressing the key for one second will result in the
inscription “MANU” disappearing from top left position of
LCD display, replaced by “AUTO” appearing in the middle,
to indicate that the meter has switched the manual range
switching mode to the auto range switchover.

Press and hold the REL/PEAK key ⑧ of the MT-4617 for a

short time, “REL” will appear on the top left position of the
LCD interface, indicating the activation of the relative value
measurement mode. Press and hold the key ⑧ for a short
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time again, the device will exit the relative value
measurement mode and return to the original measurement
mode, and “REL” on the top left position of the LCD
interface will disappear; pressing the key for one second will
lead to the peak measurement mode, “PEAK” and “MANU”
will appear on top right position of LCD display; press and
hold the key for one second once again, “PEAK” will
disappear from the top right position of the LCD interface,
and “AUTO” will appear in the middle of LCD, and the mode
will return to auto measurement mode.

Press and hold max/min value inquiry key ⑤ for a short time,
“MAX” will appear on top position of LCD interface,
switching the device to the max/min value inquiry mode; in
this mode, each short press of the key causes the mode to
change from MAX to MIN or from MIN to MAX; press and
hold the “MAX/MIN” key ⑤ for one second, “MAX/MIN” on
top position of the LCD interface will disappear, and the
mode will exit. Press and hold the data hold/zero calibration
key ⑦ of the MT-4617 for a short time to enter the data hold
mode, which will be indicated by the apparition of “HOLD”
on the top left position of the LCD interface; press and hold
the key for a short time once again, “HOLD” will disappear
from the top left position of the LCD interface, and the
device will exit the data hold mode.

In any mode with sensor covered, press and hold data

hold/zero calibration key ⑦ for one second, “ADJ” will
appear on the LCD interface, and the device will enter the
zero calibration mode: several seconds later “ADJ” will
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disappear from the LCD interface, and the device will exit
the data hold mode and return to auto measurement mode.
Tips
1: The reference position of light source test is at top of
sphere surface under light.
2: In various measurement modes, analog bar in the middle
of the LCD screen will change with figures of Nixie tubes.
3: When reading, existing data can be locked by pressing
and holding “HOLD/ZERO” key for a short time;
4: In zero calibration mode, the opto-sensor must be
covered by opto-sensor visor before calibration.
5: After completing the test, the sensor protection cover
should be put back to protect light filter and sensor.

Specific Application

Application of manual switchover of range

measurement mode
 Press and hold the RAN key (range manual switchover
key) for a short time, “MANU” will appear on the top left
position of the LCD interface, and the meter will enter
the manual switchover measurement mode (as shown in
figure 3-1-1);
 When entering manual switchover of range function,
press RAN key for a short time each time, it will switch to
20.00Lux—>200.0Lux—>2000Lux—>
20000Lux—>200000Lux (or 20.00Fc—>200.0 Fc—>
2000 Fc—>20000 Fc) in sequence;
 Press and hold RAN key for one second, “MANU” on the
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 top left position of the LCD interface will disappear, and
“AUTO” will appear in middle of LCD interface, and
manual range switchover function will exit and the
device will return to auto range switchover mode;

Figure 3-1-1 20.00Lux interface

200.0Lux interface 2000Lux interface

20000Lux interface 200000Lux

interface
Tips
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1: Only in peak value measurement mode, relative value
measurement mode and max/min value inquiry mode, will
it be effective to press RAN key for a short time.
2: In relative value measurement mode and max/min value
inquiry mode, press and hold the key for one second, it
will return to auto switchover of range.
3: In peak value measurement mode, data hold mode and
zero calibration modes, it will be effective to press and
hold RAN key for a long time.
4: In this mode, when measurement value exceeds present
range, “OL” will appear on LCD interface to indicate
over-range, and the user should switch over the
measurement range at this time.

Application of relative/peak value measurement mode

 Press and hold REL/PEAK key for a short time

(composite key for relative/peak value measurement),
“REL” will appear on the top left position of the LCD
interface (as shown in figure 3-1-2A), and the device will
enter the relative value measurement mode;
 Press and hold REL/PEAK key for a short time again,
“REL” on the top left position of the LCD interface will
disappear, and the device will exit the relative value
measurement mode and return to original
measurement mode;
 Press and hold “REL/PEAK” key for one second, the
device will enter the peak value measurement mode,
“PEAK”LCD will appear on the top right position of the
LCD interface, and at the same time, “MENU” will

15
 appear on the top left position of the LCD interface (as
shown in figure 3-1-2B);
 Press and hold the key once again for one second,
“PEAK” on top right position of LCD interface will
disappear, and “AUTO” will appear on the middle of LCD
interface, and the device will exit the peak value
measurement mode and return to auto measurement
mode (as shown in 3-1-2C).

Figure 3-1-2A Figure 3-1-2B Figure 3-1-2C

Tip
1: Only in auto measurement mode, peak value
measurement mode, max/min value inquiry mode and
data hold mode, it will be effective to press and hold
REL/PEAK key for a short time.
2: In non-zero calibration mode, press and hold
“REL/PEAK” for one second, the device will enter the
peak value measurement mode.

Application of maximum/minimum value inquiry mode

 Press and hold “MAX/MIN” key for a short time, “MAX”

will appear on top LCD interface (as shown in figure
3-1-3);

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 In max/min value inquiry mode, press “MAX/MIN” key
once, you will switch MAX to MIN or MIN to MAX;
 Press and hold “MAX/MIN” for one second, “MAX/MIN”
on top LCD interface will disappear, and the max/min
value inquiry mode will exit.

Figure 3-1-3
Tips

In non-zero calibration mode, press and hold “MAX/MIN”

key for a short time to use the max/min value inquiry
functions;

Application of data hold and zero calibration mode

 Press and hold “HOLD/ZERO” key for a short time,

“HOLD” will appear on the top left position of the LCD
interface (as shown in 3-1-4A), then the device will
enter the data hold mode;
 Press and hold the key again, “HOLD” on the top left
position of the LCD interface will disappear, and the
meter will exit the data hold mode;
 Cover the opto-sensor with the visor, and press and
hold “HOLD/ZERO” key for one second, “ADJ” will
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 appear on LCD interface (as shown in figure 3-1-4B),
then the device will enter the zero calibration mode.
Several seconds later, “ADJ” on LCD interface will
disappear, and zero calibration mode will automatically
exit and return to auto measurement mode.

Notice

Before zero calibration, the opto-sensor must be covered

with the opto-sensor visor.

. Figure 3-1-4A Figure 3-1-4B

Tips
1. In non-zero calibration mode, press and hold
“HOLD/ZERO” key for a short time to enter the data
hold mode.
2. Zero-calibration can be made in any mode.
Other Functions
Auto power-off
If there is no action on keys of the MT-4617 for a long time,
the meter will automatically power off about 10 minutes
later.
Technical Data
‧Temperature range:
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 Operation:-10～50°C, max 80 % HR（Non-Condensed）
Storage:-10～50°C，max 80 % HR (Non-Condensed)
(removing batteries)
‧Sampling rate: ≥2 times/s。
‧Display: 3½ digits, max reading of 1999, with analog bar
display;
‧Sensor: silicon photoelectric diode
‧Measured spectral range: 320～730nm
‧Measurement ranges: 20, 200, 2000, 20000, 200000
Lux20, 200, 2000, 20000 FC
‧Operating environment: indoor use
‧Height: 2000m highest
‧Battery life: Approx. 200 hours
‧Power supply: 1×9 V，IEC 6LR61
‧Dimensions (H×W×D): 170 mm×85 mm×45 mm
‧Accuracy: ±3% (calibrated with incandescent lamps in
2854K) ±6% other visible light source

Cosine angle deviation characteristics

Cosine angle Deviations
30° ±2%
60° ±6%
Tips: cosine angle is corrected in accordance with JIS C
1609:1993 and CNS 5119 Grade A General Specification.

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‧Luminous sensitivity characteristics:

Maintenance and Service

Service

Notice
When the meter seemingly fails during operation, following
steps should be followed to check the fault problem:
1: Check batteries. If “ ” appears on the LCD display,
batteries should be replaced.
2: Repair on the meter should be performed by service
centers or other qualified service professionals.

Cleaning

First wipe the meter with a damp soft cloth with clean water
or neutral detergent and then with a dry cloth.

Notice
1: Please make sure the light meter is turned off before
cleaning.
2: Do not use benzene, alcohol, acetone, ethyl ether,
ketones, thinners and gasoline, etc. in cleaning, because
20
 they will transform or fade the light meter.
3: The light meter can only be used again when it is
completely dry after cleaning.

Battery replacement

If the battery symbol appears on the LCD accompanied by

buzzer alarm, batteries must be replaced.
Batteries should be replaced as follow:
 Turn off the meter;
 Remove the screw on the back of the meter and open
the battery compartment;
 Remove exhausted batteries;
 Replace new batteries observing polarity;
 Replace the battery compartment cover and secure the
compartment screw.
Warning
1: Do pay attention to the right polarity of battery when
putting in or replacing batteries. In case of polarity
reversal, the light meter will be damaged, and can even
cause explosion or fire.
2: Never connect one polarity of the battery to the other one
with wire, nor throw batteries into fire, or it will cause an
explosion.
3: Do not attempt to dismantle the battery! The battery’s
intensively alkaline electrolyte is corrosive and endangers
the user. In case of contact of the electrolyte with skin or
clothes, immediately rinse touched parts with clean water;
in case of contact of the electrolyte with eyes, immediately
rinse eyes with clean water and seek medical advice.

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Notice
1: The light meter should be turned off before replacing
batteries.
2: Use batteries specified in technical data only.
3: If the meter is not to be used for a long time, take out the
batteries. In case the meter is polluted due to battery leak,
the meter should be sent by post to the manufacturer for
cleaning and checking.
4: For disposal of used batteries, follow existing
specifications on battery recycling, reuse and treatment.

Reference Table for Illumination Standard of Various

locations Fc illuminance value can be obtained from
Lux illumination value divided by 10.764
Schools:
Iluminance
Locations
(Lux)
Drafting classroom, sewing classroom,
1500~300
computer classroom
Classroom, laboratory, practice workshop,
research room, reading room, stack room,
office, staff lounge, conference room, health
750~200
center, restaurant, kitchen, pantry, radio room,
printing room, switchboard room, guard room,
indoor stadium
Large classroom, auditorium, storage cabinet
300~150
room, lounge, staircase
Corridor, elevator corridor, toilet, duty room,
150~75
workers room, bridge, school outdoor

22
 playground
75~30 Warehouse, garage, fire escape

Office:
Iluminance
Locations
(Lux)
2000~1500 Design office, clerk's office
Hall information channel (daytime), parlor,
1500~750
drawing office, punching, typing
Calculator room, conference room, printing
750~300 room, switchboard room, control room,
reception room, recreation room, restaurant
Stack room, entertainment room, dining
300~150 room, lounge, guard room, elevator
(passway), washroom, toilet
Tea room, changing room, warehouse,
150~75
nightwatchmen office (entrance)
75~30 Fire escape

Factories:
Iluminance
Locations
(Lux)
Ultra-precision operation, design, drafting,
3000~1500
precision inspection
Design office, analysis, assemble line,
1500~750
coating
Packaging, measurement, surface
750~300
treatment, warehouse office
300~150 Dyeing, casting, electrical room
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 Entrance and exit, corridor, information
150~75 channel, staircase, dressing room, toilet, 、
operation warehouse
Fire escape, warehouse, outdoor power
75~30 equipment (loading and unloading, inventory
move operation)

Hospital:
Iluminance
Locations
(Lux)
10000~5000 Visual function test chamber
(ophthalmology lightroom)
1500~750 Operating room
750~300 Consulting room, treatment room,
pharmacy room, prescription room, drug
store, dissection room, pathological
bacteria room, emergency rooms, maternity
ward, dean’s office, offices, nursing room,
conference room
300~150 Ward, medicine room, bed reading,
medicine changing, plaster bandage for
fractures, infant room, record room, waiting
room, consulting room, outpatient corridor
150~75 Locker room, physical therapy room, X-ray
room, ward corridor, medicine room,
sterilization room, ward room, stairs,
endoscopy room
75~30 Animal room, dark room (photo), fire
escape

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Hair salon:
Iluminance
Locations
(Lux)
1500~750 Haircut, perm, hair dyeing, cosmetics
Shave, hairdressing, lobby registration
750~300
counter, makeup
300~150 Toilet in salon
150~75 Corridor, stairways

Hotel, restaurant, recreation ground:

Iluminance
Locations
(Lux)
1500~750 Counter
Halfway, banquet hall, business room,
750~300
parking lot, kitchen
Restaurant, toilet, a large Japanese-style
300~150
room
Recreation room, corridor, stairways, guest
150~75 room, bathroom, accent lighting for gardens,
changing room
75~30 Fire escape

Shop, department store:

Iluminance
Locations
(Lux)
Indoor display, decorative window display,
3000~750 demonstration area, checkout counter,
packaging table
750~300 Elevator lobby, escalators
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 Discussion room, dressing room, toilet,
300~150
stairs, walkways
150~75 Lounge, general lighting in store

House:
Iluminance
Locations
(Lux)
2000~750 Handcraft, tailoring
1000~500 Writing, work
Reading, makeup, kitchen table, processing
750~300
area, telephone
Wash sink, entertainment room, living room,
300~150
family reunion, entrance (inside) mirror
Wardrobe, bedroom, bathroom, stairs,
150~70
corridor
75~30 Doorplate, mailbox, doorbell key, terrace

26
MT-4617 照度計 使用說明書

聲明
根據國際版權法，未經允許和書面同意，不得以任何形
式複製本說明書的任何內容。
本說明書在將來的版本中如有更改，恕不另行通知。

安全聲明
小心或注意
“小心”或”注意”標誌表示會對儀錶或設備造成損壞的狀
況和操作。
它要求在執行此操作時必須小心，如果不正確執行此操
作或不遵循此操作步驟，則可能導致儀錶或設備損壞。
在不滿足這些條件或沒有完全理解的情況下，請勿繼續
執行小心標誌所指示的任何操作。
警告
“警告”標誌表示會對用戶造成危險的狀況和操作。
它要求在執行此操作時必須注意，如果不正確執此行操
作或不遵守此操作步驟，則可能導致人身傷害或傷亡。
在不滿足這些條件或沒有完全理解的情況下，請勿繼續
執行警告標誌所指示的任何操作。

安全資訊
警告
請勿在存在爆炸性氣體物質、可燃蒸汽物質及充滿粉塵
的環境中使用本儀錶！

27
安全符號說明
本說明書包含安全操作和維護的基本要素。使用前，請
仔細閱讀下面的安全資訊。
表 1：安全資訊
用戶在使用前必須閱讀的重要資訊

符合歐盟 CE 安全規範
表 2：警告資訊
表明錯誤的操作將導致嚴重的傷害甚
警告
至死亡事故發生
表明錯誤的操作或疏忽將導致儀錶損
注意
壞或測量結果錯誤等

提示 操作建議或提示

操作注意事項
遵從以下注意事項，確保安全操作和獲得最佳的性能。
1. 首次使用前，請檢查照度計是否工作正常，確認在
存儲和運輸期間沒有受到損壞。
2. 使用環境：溫度-10°C～50°C；濕度<80%RH（無
凝露）
3. 存放環境：溫度-10°C～50°C；濕度<70%RH（無
凝露）
4. 為避免故障，請不要使照度計處於高溫或高濕、腐
蝕性或爆炸性氣體、強電磁或強振動、粉塵的環境。
5. 為避免損壞，搬運及使用過程中應避免劇烈機械振
動，尤其避免發生跌落事故。
28
6. 只有專業人員才能對本照度計進行校準和維修。
7. 在每次使用前，都要檢查照度計的光感測器有無磨
損、有無粉塵。請確保照度計的光感測器是處於光
滑完好、潔淨的狀態。如果照度計的一個或多個功
能不正常或沒有為工作準備就緒，則不得使用照度
計進行測量工作。
8. 在使用照度計時，不能長期使儀錶測量值處於溢出
狀態（OL）
。
9. 要避免日光暴曬。只有這樣才能保證儀錶的功能正
常和長久的使用壽命。
10. 如果儀錶受到極強電磁場的作用，則其功能會受影
響。
11. 電池注意避免受潮。若顯示幕顯示電池欠壓提示
符，則必須更換電池,只允許使用技術資料中指定電
池型號。
12. 光檢測器的靈敏度會因使用條件或時間而降低。建
議您將儀錶做定期校正，以保證精確度。
13. 請您妥善保管原始包裝，以便今後郵寄之用（如對
照度計校準時）。
概述
如果您是一個專業攝影師或者是一個業餘攝影愛好
者，您在攝影時想要抓到完美的鏡頭，那麼您要考慮的
不僅僅是場景，更要注重周圍的光照度，雖然人眼可以
大概的估算光的亮度，但是攝影機對光亮度的補償要求
是存在差異的，這會導致實際照出來的圖片與預計的效
果形成較大的反差。此時您是否渴望擁有一個測量光照
度的儀器？當您在購置新房時，您不但要求地理位置
好，而且要求白天時室內要明亮，此時您是否也渴望擁
有一個測量光照度的儀器探測室內的各個角落的光照
度？
29
 多功能照度計的人機介面十分友好，按鍵操作便
捷，顯示效果直觀形象，可測量螢光燈、金屬鹵化燈、
高壓鈉燈或白熾燈等光源發出的可見光。

功能特點
1. 自動和手動切換量程；
2. 最大、最小值查詢功能；
3. 資料保持功能；
4. 峰值測量功能；
5. 相對值測量功能；
6. 零點校準功能；
7. 3 1/2 位元 LCD 顯示，帶類比條顯示
8. 單位轉換功能 Fc/Lux
9. 超量程顯示“OL”，提示超量程；
10. 精度高，測量範圍寬（0.00～200000Lux）；
11. 電池欠壓指示；
12. 按鍵音和靜音選擇；
13. 自動關機功能(超過 10 分鐘無按鍵操作即自動關閉
電源)
14. 結構緊湊，牢固耐用，便於攜帶

30
儀錶面板說明

① 光感測器保護蓋
② 光感測器
③ LCD 顯示幕
31
④ 電源、按鍵音複合按鈕：
開/關電源：短按開機，長按 1S 關機；
開啟/關閉按鍵音：工作模式，短按開啟/關閉按鍵
音，開機默認有按鍵音。
⑤ 最大最小值查詢模式按鈕。
⑥ 單位轉換按鈕：
勒克司/英尺燭光(Lux/ Fc)
⑦ 資料保持、零點校準複合按鈕：
資料保持：短按，進入/退出資料保持模式
零點校準：長按 1S，執行零點校準功能
⑧ 相對值測量、峰值測量複合按鈕：
相對值測量：短按，進入/退出相對值測量模式
峰值測量：長按 1S，進入/退出峰值測量模式
⑨ 手動切換量程按鈕：
短按，進入手動量程狀態，按一下跳到下一量程。
長按超過 1 秒，則退出手動量程模式。

32
LCD 顯示介面

1.手動切換量程模式提示符號
2. 資料保持模式提示符號
3. 類比條顯示當前測量值資訊
4. 數位顯示當前測量值資訊
5. Lux 單位符號
6. Fc 單位符號
7. 自動測量模式提示符號
8. 峰值測量模式提示符號
9. 電池電壓低電提示符號
10. 相對值測量模式提示符號
11. 最大值查詢模式提示符號
12. 最小值查詢模式提示符號
33
測量方法
測量前的注意事項
警告
1：請勿在存在爆炸性氣體物質、可燃蒸汽物質及充滿
粉塵的環境中使用本儀錶！
2：請勿在高溫、高濕場所下測量。
3：請勿在強紅外線或紫線環境中使用本儀錶！

提示
1. 本儀器光感測器類比人眼對光的敏感曲線而設計，
光譜範圍為 320～730nm。若處於紅外線區域測
量，則資料將偏差較大。
2. 光感測器在 2854 °K 色溫條件下依照 CIE 普通
白熾燈進行校準；對其他類燈的光譜，所提供的讀
數可能不同。
3. 光源測試參考准位在受光球面正頂端。
4. 測量前使光檢測器曝光 2 分鐘後，方可開始測量。
5. 要防止測試者的人影和其他因素對光檢測器的影
響。
作用原理
各照度標度的概念
1 勒克司(流明)是與光強為一燭光的燈垂直距離 1 米
處，面積為 1 平方米的表面上接受的照度。
1 英尺燭光 (Fc) 是與光強為一燭光的燈垂直距離 1 英
尺處，面積為 1 平方英尺的表面上接受的照度。
照度標度單位轉換：
1 Fc = 10.764 Lux；

34
1 Lux = 0.09290 Fc。
光照度與發光強度的換算公式：E = I / r 2
式中：E --- 光照度值(單位：Lux)；
I --- 光源的發光強度（單位：cd）；
r --- 光源發光面到光檢測器之間的距離（單位：m）。
測定時，要求光源發光面和光感測器之間的最小距離應
大於光源發光面（或光感測器）最大尺寸的 15 倍。
典型練習實例
站在某一光源下，取下多功能照度計感測器保護蓋並將
它與光源垂直放置。
短按電源鍵開機，此時 LCD 屏全顯（約 1S），同時蜂
鳴器鳴響兩聲，LCD 屏正中間顯示“AUTO”字樣，儀器
進入自動測量模式。短按手動切換量程 RAN 鍵，LCD
左上方顯示“MANU”字樣進入手動切換量程模式，進入
手動切換量程功能後每次短按該鍵，則按
20.00Lux—>200.0Lux—>2000Lux—>20000Lux—>2
00000Lux( 或 20.00Fc—>200.0 Fc—>2000
Fc—>20000 Fc)迴圈；長按該鍵 1 秒，LCD 左上方的
“MANU”字樣熄滅，LCD 正中間顯示“AUTO”字樣，退出
手動切換量程功能，返回自動切換量程。短按相對值測
量、峰值測量 REL/PEAK 複合鍵，LCD 介面左上方顯
示“REL”字樣，進入相對值測量模式，再次短按該鍵則
退出相對值測量模式，LCD 介面左上方“REL”字樣熄
滅，返回原來的測量模式；長按相對值測量、峰值測量
複合鍵 1 秒，進入峰值測量模式，LCD 介面右上方顯示
“PEAK”和“MANU”字樣，再次長按該鍵 1 秒，LCD 右上
方的“PEAK”字樣熄滅，LCD 正中間顯示“AUTO”字樣，
35
返回自動測量模式。短按最大最小值查詢 MAX/MIN
鍵，LCD 介面正上方顯示“MAX”字樣，進入最大最小值
查詢模式，最大最小值查詢模式下，每次短按該鍵，則
按 MAX<—>MIN 迴圈切換；長按“MAX/MIN”鍵 1 秒，
LCD 介面正上方的“MAX/MIN”字樣消失，退出最大最小
值查詢模式。短按資料保持、零點校準 HOLD/ZERO
複合鍵， LCD 介面左上方顯示“HOLD”字樣，進入資料
保持模式，再次短按該鍵，LCD 介面左上方的“HOLD”
字樣消失，退出資料保持模式；在任何模式下蓋住感測
器，長按資料保持、零點校準複合鍵 1 秒，LCD 介面顯
示“ADJ”字樣，進入零點校準模式，幾秒後 LCD 介面顯
示的“ADJ”字樣消失，自動退出零點校準模式，返回自
動測量模式。
提示
1. 光源測試參考准位在受光球面正頂端。
2. 在各種測量模式下，LCD 正中間的類比條都會隨著
數碼管的數位的變化而相應地變化。
3. 讀數時，可短按“HOLD/ZERO”鎖定當前資料；
4. 在進行零點校準時，一定要將光感測器保護蓋蓋住
光感測器，方可進行。
5. 當完成測試時，將感測器保護罩蓋回，以保護濾光
片和感測器。

具體應用
手動切換量程測量模式應用
1. 短按 RAN 鍵（手動切換量程鍵） ，進入手動切換量
程，LCD 左上方顯示“MANU”字樣（如下圖所示）；
36
2. 進入手動切換量程功能後每次短按 RAN 鍵，則按
20.00Lux—>200.0Lux—>2000Lux—>20000Lux
—>200000Lux( 或 20.00Fc—>200.0 Fc—>2000
Fc—>20000 Fc)迴圈；
3. 長按 RAN 鍵 1 秒，LCD 左上方的“MANU”字樣熄
滅，LCD 正中間顯示“AUTO”字樣，退出手動切換
量程功能，返回自動切換量程；
4.

20.00Lux 檔介面

200.0Lux 檔介面 2000Lux 檔介面

20000Lux 檔介面 200000Lux 档界

37
 提示
1. 在峰值測量、相對值測量和最大最小值查詢模式下
短按 RAN 鍵方有效。
2. 在相對值測量模式和最大最小值查詢模式下長按該
鍵 1 秒, 則返回自動切換量程。
3. 在峰值測量模式、資料保持模式和零點校準模式下
長按 RAN 鍵無效。
4. 在此模式中，當測量值超過當前量程時，LCD 顯示
“OL”，提示超量程。此時用戶應切換測量量程；

相對值與峰值測量模式應用
1. 短按 REL/PEAK 鍵（相對值測量、峰值測量複合
鍵），LCD 介面左上方顯示“REL”字樣（如下圖
3-1-2A 所示）
，進入相對值測量模式；
2. 再次短按 REL/PEAK 鍵則退出相對值測量模式，
LCD 介面左上方“REL”字樣熄滅，返回原來的測量
模式；
3. 長按“REL/PEAK”鍵 1 秒，進入峰值測量模式，LCD
介面右上方顯示“PEAK”字樣，同時 LCD 左上方顯
示“MENU”字樣（如圖 3-1-2B 所示）；
4. 再次長按該鍵 1 秒，LCD 右上方的“PEAK”字樣熄
滅，LCD 正中間顯示“AUTO”字樣，返回自動測量
模式（如圖 3-1-2C 所示） 。

38
 圖 3-1-2A

圖 3-1-2B 圖 3-1-2C

提示
1. 在自動測量模式、峰值測量模式、最大最小值查詢
模式和資料保持模式下短按 REL/PEAK 鍵方有效。
2. 在非零點校準模式下長按“REL/PEAK”鍵 1 秒，均
能進入峰值測量模式。

最大最小值查詢模式應用
1. 短按“MAX/MIN”鍵，LCD 介面正上方顯示“MAX”字
樣（如圖 3-1-3 所示），進入最大最小值查詢模式；
2. 最大最小值查詢模式下，每次短按“MAX/MIN”鍵，
則按 MAX<—>MIN 迴圈切換；

39
3. 長 按 “MAX/MIN” 鍵 1 秒 ， LCD 介 面 正 上 方 的
“MAX/MIN”字樣消失，退出最大最小值查詢模式。

圖 3-1-3

提示
在非零點校準模式下，短按 MAX/MIN”鍵均有效，都
可進行最大最小值查詢功能；

資料保持與零點校準模式應用
1. 短 按 “HOLD/ZERO” 鍵 ， LCD 介 面 左 上 方 顯 示
“HOLD”字樣（如圖 3-1-4A 所示） ，進入資料保持模
式；
2. 再次短按該鍵，LCD 介面左上方的“HOLD”字樣消
失，退出資料保持模式；
3. 將 光 感 測 器 保 護 蓋 蓋 住 光 感 測 器 ， 長 按
“HOLD/ZERO”鍵 1 秒，LCD 介面顯示“ADJ”字樣 （如
圖 3-1-4B 所示），進入零點校準模式，幾秒後 LCD
介面顯示的“ADJ”字樣消失，自動退出零點校準模
式，返回自動測量模式。

40
 圖 3-1-4A 圖 3-1-4B

注意
在零點校準前，一定要將光感測器保護蓋蓋住光感
測器，方可進行。
提示
1. 在非零點校準模式下，短按“HOLD/ZERO”鍵均有
效，都可進入資料保持模式。
2. 在任何模式下都可進行零點校準。

其他功能
靜音功能
短按電源/按鍵音複合銨鈕開啟或關閉按鍵音。
自動關機功能
在 10 分鐘內無任何操作，儀錶將自動關機。

技術資料
1. 溫度範圍：
工作：-10～50 ℃，最大 80 %的相對濕度（非凝
結）。
儲存：-10～50 ℃，最大 80 %的相對濕度（非凝結）
（取掉電池） 。
41
2. 採樣速率：≥2 次/秒。
3. 顯示幕：3½ 位元，最大讀數 1999，帶類比條顯示；
4. 感測器： 矽光電二極體
5. 測量光譜範圍：320～730nm
6. 測量範圍：20、200、2000、20000、200000 Lux
20、200、2000、20000 FC
7. 使用環境：室內使用
8. 海拔： 最高 2000m
9. 電池壽命：大約 200 小時
10. 電源：1×9 V，IEC 6LR61
11. 尺寸（高×寬×深）：170 mm×85 mm×45 mm
12. 精度：±3%（在 2854K 時依照普通白熾燈校準）
±6% 其他可見光光源

余弦角度偏差特性
余弦角度 誤差
30° ±2%
60° ±6%
注：余弦角度依照 JIS C 1609:1993 和 CNS 5119 A 級通用規範修正。
13. 光靈敏度特性：
100

80
Relative Sensitivity (%)

60

40

20

400 500 600 700 800 900 1000

Wave Length (nm)

42
維護和維修
維修

注意
如果儀錶在使用過程中似乎存在故障，應執行下列步驟
確定問題的根源：
1. 檢查電池。當液晶顯示幕上出現“ ” 符號時應立
即更換電池。
2. 查閱操作說明確定操作步驟是否有誤。
3. 儀錶的維修必須由經廠家授權的服務中心或其他具
備資格的儀器維修人員承擔。
清潔
先用沾有清水或中性清潔劑的軟布擦拭探測儀，最後用
幹布擦乾。

注意
1. 在進行清潔工作之前，請您確保設備已經關機。
2. 在清潔工作中，請勿使用苯類，酒精，丙酮，乙醚，
酮，稀釋劑，汽油等，這些會造成設備變形或退色。
3. 在清潔之後要等到設備完全乾燥之後，方可繼續使
用。
更換電池
如果顯示幕上出現電池符號閃爍（LCD 介面⑨）則必須
更換電池。更換電池步驟如下：
1. 將儀錶關機；
2. 擰儀錶備背面的螺釘，揭開儀錶的電池格蓋罩；
3. 取出耗盡的電池；

43
4. 按照正確的極性安裝新的電池；

注意
1. 在更換電池之前，必須將儀錶關機。
2. 只能夠使用在技術資料中指定的電池。
3. 如果在較長時期內不使用儀錶，則要將其中的電池
取出來。
4. 在處理廢舊電池時，必須遵照現行的關於電池回
收、再利用和處理的規定。

各種場所照度標準參考表
將 Lux 照度值除以 10.764，即可求得 Fc 照度值。

學校：
照度（Lux） 場所
1500~300 製圖教室、縫紉教室、電腦教室
750~200 教室、實驗室、實習工廠、研究室、圖書
閱覽室、書庫、辦公室、教職員休息室、
會議室、保健室、餐廳、廚房、配膳室、
廣播室、印刷室、總機室、守衛室、室內
運動場
300~150 大教室、禮堂、貯櫃室、休息室、樓梯間
150~75 走廊、電梯走道、廁所、值班室、工友室、
天橋、校內室外運動場
75~30 倉庫、車庫、安全梯

44
事務所：
照度（Lux） 場所
2000~1500 設計室、事務室
1500~750 大廳通道(白天)、營業室、製圖室、打卡、
打字
750~300 計算器室、會議室、印刷室、總機室、
控制室、招待室、娛樂室、餐廳
300~150 書庫、娛樂室、餐廳教室、休息室、警
衛室、電梯(走道)、盥洗室、廁所
150~75 喝茶室、更衣室、倉庫、值夜室(入口處)
75~30 太平梯

工廠：
照度（Lux） 場所
3000~1500 超精密作業、設計、製圖、精密檢查
1500~750 設計室、分析、組立線、塗裝
750~300 包裝、計量、表面處理、倉庫辦公室
300~150 染色、鑄造、電氣室
150~75 進出口、走廊、通道、樓梯、化粧室、
廁所、附作業場倉庫
75~30 太平梯、倉庫、屋外動力設備(裝卸貨、
存貨移動作業)

醫院：
照度（Lux） 場所
10000~5000 視機能檢查室（眼科明室）
1500~750 開刀房
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750~300 診療室、治療室、制藥室、配藥室、藥
局室、解剖室、病理細菌室、急救室、
產房、院長室、辦公室、護士室、會議
室
300~150 病房、藥品室、病床看書、換藥、骨折
石膏包紮、嬰房、紀錄室、候診室、會
診室、門診走廊
150~75 更衣室、物療室、X 光室、病房走廊、
藥品室、滅菌室、病房室、樓梯、內視
鏡室
75~30 動物室、暗室(照片)、太平梯

理髮院：
照度（Lux） 場所
1500~750 剪燙髮、染整發、化妝
750~300 修臉、洗髮、前廳掛號台、整裝
300~150 店內廁所
150~75 走廊、樓梯

旅館、飯店、娛樂場：
照度（Lux） 場所
1500~750 櫃檯
750~300 玄關、宴會場、事務室、停車處、廚房
300~150 餐廳、洗手間、日式大房間
150~75 娛樂室、走廊、樓梯、客房、浴室、庭院
重點照明、更衣室
75~30 太平梯
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商店、百貨店：
照度（Lux） 場所
3000~750 室內陳列、飾窗陳列、示範表演場所、
結帳櫃檯、包裝台
750~300 電梯大廳、電扶梯
300~150 商談室、化粧室、廁所、樓梯、走道
150~75 休息室、店內一般照明

住家：
照度（Lux） 場所
2000~750 手工藝、裁縫
1000~500 寫作、作業
750~300 讀書、化妝、廚桌、調理、電話
300~150 洗水槽、娛樂室、客廳、團聚、玄關(內
側)鏡子
150~70 衣櫃、寢室、廁所、樓梯、走廊
75~30 門牌、信箱、門鈴鈕、陽臺

PROKIT’S INDUSTRIES CO., LTD.

Test Equipment Depot - 800.517.8431
99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
©2015 Prokit’s Industries Co., Ltd. All rights reserved 2015001

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