Major tech MT943 User manual
INSTRUCTION MANUAL
DATA LOGGING LIGHT METER
MT943
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3
Contents Page no
1. Introduction.....................................................................................4
2. Safety..............................................................................................4
3. Specifications...................................................................................5
4. Description.......................................................................................6
5. Operation.........................................................................................7
5.1. Power-Up.................................................................................7
5.2. Selecting the Lux or FC Scale.......................................................7
5.3. Auto Power Off..........................................................................7
5.4. Over Range..............................................................................7
5.5. Data-Hold Mode........................................................................7
5.6. Peak-Hold Mode........................................................................7
5.7. Maximum and Minimum Mode....................................................7
5.8. Relative Reading Mode...............................................................7
5.9. USB Mode................................................................................8
5.10. Backlight Function.....................................................................8
5.11. Setup Time and Sampling Rate...................................................8
5.12. MEM Function...........................................................................8
5.13. Data logger Function.................................................................8
6. Battery Check-Up & Replacement........................................................9
7. Spectral Sensitivity Characteristic........................................................9
8. Connecting to the PC..........................................................................9
8.1. System Requirements................................................................9
8.2. Connection...............................................................................9
9. Installing the Software.....................................................................10
10. Maintenance...................................................................................10
11. Recommended Illumination..............................................................11
4
1. INTRODUCTION
• The digital illuminance meter is a precision instrument used to measure
illuminance (Lux, footcandle) in the field.
• It is meet CIE photopic spectral response.
• It is fully cosine corrected for the angular incidence of light.
• The illuminance meter is compact, tough and easy to handle owing to its
construction.
• The light sensitive component used in the meter is a very stable, long-life
silicon photo diode and spectral response filter.
2. SAFETY
• Light-measuring levels ranging form 0.1Lux~0.1kLux/0.01FC~0.01kFC,
repeatedly.
• High accuracy and rapid response.
• Data-hold function for holding measuring values.
• Unit and sign display for easy reading.
• Automatic zeroing.
• Meter corrected for spectral relative efficiency.
• Correction factor need not be manually calculated for non-standard light
sources.
• Short rise and fall times.
• Peak-hold function for tracing the peak signal of light pulse with least
duration 10μs and keep it.
• Capable of selecting measuring mode in Lux or FC scale alternatively.
• Auto power off 15minutes or disable Auto Power Off.
• Maximum and minimum measurements.
• Relative reading .
• Easy to read large backlit display.
• USB output connect with PC.
• 4 Level ranging.
• 99 values in memory ,that could be read on the meter.
• More than 16000 values records datalogger.
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Display 3-3/4 digit LCD with high speed 40 segment bar
graph.
Measuring Range 400.0Lux, 4000Lux, 40.00kLux and 400.0kLux /
40.00FC, 400.0FC, 4000FC, 40.00kFC
Note: 1FC=10.76Lux, 1kLux=1000Lux,
1kFC=1000FC
Over Range Display LCD will show “OL” symbol.
Spectral Response CIE Photopic (CIE human eye response curve).
Spectral Accuracy CIE Vλ function f1’ ≤6%
Cosine Response f2’ ≤2%
Accuracy ±3% rdg±0.5%f.s. (<10,000Lux); ±4%
rdg±10d. (>10,000Lux)
Repeatability ±3%
Sampling Rate 1.3 times/sec of analog bar-graph indication;
1.3times/sec of digital display. Datalogger
sampling could be setup.
Photo Detector One silicon photo diode and spectral response
filter.
Operating Temperature 0 to 40°C (32 to 104°F)
Operating Humidity 0% to 80%RH
Storage Temperature -10 to 50°C (14 to 140°F)
Storage Humidity 0% to 70% RH
Power Source 1 piece 9V battery
Photo Detector
Lead Length 150cm (approx.)
Photo Detector
Dimensions 115 x 60 x 20mm (L x W x H)
Meter Dimensions 170 x 80 x 40mm (L x W x H)
Weight 390g
Accessories Carry Case, Instruction Manual, Battery
Function Range
3.SPECIFICATIONS
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4. DESCRIPTION
1 - LCD Display
2 - USB Interface
3 - UNITS Button
4 - Backlight/LOAD Control Button
5 - RANGE Button
6 - REC/SET Button
7 - MAX/MIN Button
8 - Peak Hold Button
9 - REL Button
10 - Data Hold Button
11 - Power Button
12 - Photo Detector
13 - Battery Cover
7
5. OPERATING INSTRUCTIONS
5.1. Power-Up
Press the Power Button to turn the meter ON or OFF.
5.2. Selecting the Lux or FC scale
Set the RANGE Button to desired Lux or FC range.
5.3. Auto Power Off
Press the REC/SET Button and RANGE/APO Button, enable the Auto
Power Off or disable this function.
5.4. Over Range
• If the instrument only displays “OL”, the input signal is too strong, and
a higher range should be selected.
• The range will show on the down of the LCD.
• LUX: 400->4k->40k->400k; FC: 40-> 400->4k->40k.
5.5. Data-Hold Mode
• Press the Data Hold Button to select Data-Hold mode.
• When Data-Hold mode is selected, the illuminance meter stops all
further measurements.
• Press the Data Hold Button again to exit Data-Hold mode, then it
resumes normal operation.
5.6. Peak-Hold Mode
• Press the Peak Hold Button to choose Pmax or Pmin recorder mode,
and expose the photo detector to light pulse measuring field.
• Press the Peak Hold Button again to exit PEAK recorder mode, then
the meter will resume normal operation.
5.7. Maximum and Minimum Mode
• Press the MAX/MIN Button to choose the Maximum (MAX) reading,
Minimum (MIN) reading and current reading (MAX/MIN blink) recorder
mode.
• Press the MAX/MIN Button again to exit this mode.
5.8. Relative Reading Mode
• Press the REL Button to enter Relative mode.
• The display shown zero value and the current reading will be stored as a
zero-in value.
• Press the REL Button again to exit this mode.
8
5.9. USB Mode
Connect with PC with USB, the “ ” will displays in the screen.
510. Back-Light Function
Press the Backlight Button to turn on; Press again to turn off.
5.11. Setup Time and Sampling Rate
• Press the MEM/SETUP Button and UNITS Button key to start to setup
the time and sampling.
• The first setup target is the hour, press the PEAK or REL Button to
choose the function of the setting
• Press the REL Button to choose function to repeat as below process:
Hour->minter->second->sampling->month-> day->week->year-
>hour……
• Press the PEAK Button to choose the function and repeat as below
process: Hour->year->week->day->month-> sampling->second-
>minter->hour->year……
• Press the MAX/MIN Button to add the function of setting, press the
HOLD Button to reduce the function of setting.
• Hold the MEM/SETUP and UNITS Button to exit the setting time and
sampling mode, and then confirm.
5.12. MEM Function
• Press the MEM/SET Button to save the present data.
• HOLD the LOAD Button for 5s to start to load the records.
• Press the MAX/MIN Button to add the number of records.
• Press the HOLD Button to reduce the number of records.
• After you do that you must hold the LOAD Button 5s to resume normal
operation.
5.13. Datalogger Function
• Setup the time and sampling rate first, the default sampling rate is 1s.
• Hold the MEM/SETUP Button for 5s to start the datalogger function,
the MEM on the screen will be flicker.
• If the memory IC is full ,the memory number will show ‘OL’.
• Press the MEM/SETUP Button for 5s to stop the datalogger function,
then the meter will resume normal operation.
• Then the datalogger number will return to 1, you could start your
records again.
• HOLD the MEM/SETUP and LOAD Button for 5s to clear the 99
memory.
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6. BATTERY CHECK-UP & REPLACEMENT
1. If the battery power is not sufficient, LCD will display low battery and
replacement of one new battery is required.
2. After turning off the meter, disconnect the battery cover with a
screwdriver.
3. Disconnect the battery from the instrument and replace it with a
standard 9V battery and replace the cover.
7. SPECTRAL SENSITIVITY CHARACTERISTIC
On the detector, the applied photo diode with filters makes the spectral
sensitivity characteristic meeting C.I.E.(INTERNATIONAL COMMISSION
ON ILLUMINATION) Photo curve V (λ ) as the following chart described.
8. CONNECTING TO PC
8.1. System requirements
Windows 10 or higher.
8.2. Connection
1. Switch the light meter on.
2. Plug the other end of the connecting cable to serial interface of the PC
(USB).
3. Plug the USB line connecting cable 13.6mm jack plug into the meter
socket
4. Start the light meter software.
5. Selecting the COM port 3, note select the 4 COM.
Note: You should switch the light meter on before you plug the USB line
connecting cable 13.6mm jack plug into the meter.
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9. INSTALLING THE SOFTWARE
1. Start windows
2. Insert the USB into the PC or Laptop and download the software.
3. Now follow the installation program instructions.
4. Once the software is installed, switch on the meter.
5. Start the software.
8. Selected the COM port 3, note is 4.
9. If the connection is not in order, the message “NO CONNECTION”
appears on the screen.
10. MAINTENANCE
• The white plastic disc on the top of the detector should be cleaned with
a damp cloth when necessary.
• Do not store the instrument where temperature or humidity is
excessively high.
• The reference level, as marker on the face plate, is the tip of the photo
detector globe.
• The calibration interval for the photo detector will vary according to
operational conditions, but generally the sensitivity decreases in direct
proportion to the product of luminous intensity by the operational time.
• In order to maintain the basic accuracy of the instrument, periodic
calibration is recommended.
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