Pro's Kit MT-4617LED User manual

MT-4617LED LED Light Intensity Meter
User’s Manual
1st Edition, 2018
©2018 Prokit’s Industries Co., Ltd

1
Introduction
Thank you for your purchase of the MT-4617LED 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-4617LED 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
Table 2: Warning message
Warning
It indicates that incorrect operation will lead to
serious injury or even fatal accidents
Notice
It indicates that incorrect operation or negligence will
lead to meter damage or wrong measurement
results, etc.
Tips
Operation suggestions or prompts

2
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
Operation
environment
-10～50℃ (14～122°F)
<80%RH(non-condensed)
Storage
environment
-10～+50℃ (14～122°F)
<70%RH(non-condensed)
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.

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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 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).

4
Introduction
Product description
The MT-4617LED 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. It designed for
measuring all visible light produced by all color of LED, fluorescent
lamp, metal-halide lamp, high voltage sodium lamp or electric
incandescent lamp. You can choose different types of light source
according your needs and set the light source parameters according to
the need as well.
Outstanding features:
 Automatic and manual range switching;
 Can measure a variety of different colors of light.
 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 indication;
 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.

5
Name and function of components
Plan view
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.

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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.
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.
5. Lux unit
6. FC unit
Prompt for auto measurement mode
7. Prompt for peak value measurement mode

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8. Prompt for low battery
9. Prompt for relative value measurement mode
10. Prompt for max and min values inquiry
11. Select light source.
12. Light source code.
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 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 indicates the illuminance from a surface of one square meter,
all points of which are one meter from a uniform source of one candela.

8
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
E = I / r 2
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 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-4617LED multi-functional light
meter sensor and place it at right angle to the light source.
Press and hold the MT-4617LED 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-4617LED
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 to 20.00Lux—> 200.0Lux—> 2000Lux—>

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20000Lux—>200000Lux (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 on the top left position, 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-4617LED 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 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-4617LED 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.

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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 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.
Applications
Application of manual switchover of range measurement mode
 Long press the RAN key, “MANU” will appear on the top left position
of the LCD, it means the meter is in the manual measurement mode
(as shown in figure 3-1-1);
 When in manual measurement mode, long press RAN key for 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” will switch to
“AUTO” on the top left position of the LCD, the device will return to
auto range measurement mode;

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Figure 3-1-1 20.00Lux interface
200.0Lux interface 2000Lux interface
20000Lux interface 200000Lux interface
Tips
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.

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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 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

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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);
 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;

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 Cover the opto-sensor with the visor, and press and hold
“HOLD/ZERO” key for one second, “ADJ” will 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.
Application of light source selection mode
1 Selection of light source:
1.1 Long press “MAX/MIN/L.S.” key for one second, “L.S.LN”
will flashes for light source selection
1.2 Light source selection mode, please short press
“MAX/MIN/L.S.” or “Lx/Fc” key to select light source from
L0~L9
L0 for standard light
L1 for LED white
L2 for LED red
L3 for LED yellow
L4 for LED green

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L5 for LED blue
L6 for LED purple
1.3 Press the “HOLD/ZERO” key to confirm, and then
measure
2 Light source parameter setting
2.1 Long press “MAX/MIN/L.S.” key for one second, “L.S.LN”
will flashes for light source selection
2.2 Light source selection mode, please short press
“MAX/MIN/L.S.” or “Lx/Fc” key to select light source from
L0~L9
2.3 Short press “RAN” key again to change the light source
parameter to meet your need.
2.4 Long press “MAX/MIN/L.S.” to save the new Light source
parameter，and then go into measurement mode；
2.5 Default setting of light source parameter：
L0—> standard light source：1.000
L1—>LED white：0.990
L2—>LED red：0.516
L3—>LED yellow：0.815
L4—>LED green：1.216
L5—>LED blue：1.475
L6—>LED purple：1.148
L7--L9—> standard light source：1.000, you can reset
the L7~L9 parameters according your need, but highly
recommend keeping L0-L9 parameter as standard.
Other Functions
Auto power-off
If there is no action on keys of the MT-4617LED for a long time, the
meter will automatically power off about 10 minutes later.

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Technical Data
‧Temperature range:
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, 1999 counts, 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.
‧Luminous sensitivity characteristics:

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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 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.

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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.
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
(Lux)
Locations
1500~300
Drafting classroom, sewing classroom, computer
classroom
750~200
Classroom, laboratory, practice workshop, research
room, reading room, stack room, office, staff lounge,
conference room, health center, restaurant, kitchen,
pantry, radio room, printing room, switchboard room,
guard room, indoor stadium
300~150
Large classroom, auditorium, storage cabinet room,
lounge, staircase
150~75
Corridor, elevator corridor, toilet, duty room, workers
room, bridge, school outdoor playground
75~30
Warehouse, garage, fire escape

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Office:
Iluminance
(Lux)
Locations
2000~1500
Design office, clerk's office
1500~750
Hall information channel (daytime), parlor,
drawing office, punching, typing
750~300
Calculator room, conference room, printing room,
switchboard room, control room, reception room,
recreation room, restaurant
300~150
Stack room, entertainment room, dining room,
lounge, guard room, elevator (passway),
washroom, toilet
150~75
Tea room, changing room, warehouse,
nightwatchmen office (entrance)
75~30
Fire escape
Factories:
Iluminance
(Lux)
Locations
3000~1500
Ultra-precision operation, design, drafting, precision
inspection
1500~750
Design office, analysis, assemble line, coating
750~300
Packaging, measurement, surface treatment,
warehouse office
300~150
Dyeing, casting, electrical room
150~75
Entrance and exit, corridor, information channel,
staircase, dressing room, toilet, 、operation
warehouse
75~30
Fire escape, warehouse, outdoor power equipment
(loading and unloading, inventory move operation)