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MT-4617 Light Intensity Meter
User’s Manual
st
Edition, 2015
1
©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
Warning
Notice
will lead to serious injury or even fatal
accidents
It indicates that incorrect operation
negligence will lead to meter damage
wrong measurement results, etc.
Tips
Operation suggestions or prompts
Operation con sid eratio ns
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
Storage environment
-10～50℃ (14～122°F)
<80%RH(non-condensed)
-10～+50℃ (14～122°F)
<70%RH(non-condensed)
2
To avoid faults, please DO NOT place the light meter in
following environments:
3:Use
Notice
The operation temperature range for the light meter is
1.
-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
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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
The sensitivity of the optical detector will be lessened
1.
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
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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.
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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 t
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!
ps
Ti
The opto-sensor of this meter is designed by simulating
1:
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
he light meter in environments full of dusts or
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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
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）.
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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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