Major tech MT745 Manuel utilisateur
MT745
FLEXIBLE AC CURRENT
TRMS CLAMP METER
INSTRUCTION MANUAL
The MT745 features:
Introduction
Safety
Congratulations on your purchase of the MT745 True RMS Flexible AC Current
Clamp meter.
ŸAuto Power OFF
ŸData Hold
ŸInrush
ŸFrequency
ŸData logger
ŸBacklit LCD display
ŸBluetooth wireless transmit
International Safety Symbols
This symbol adjacent to another symbol, terminal or operating device
indicates that the operator must refer to an explanation in the Operating
Instructions to avoid personal injury or damage to the meter.
!
This symbol adjacent to one or more terminals identifies them as being
associated with ranges that may, in normal use, be subjected to
particularly hazardous voltages. For maximum safety, the meter and its
test leads should not be handled when these terminals are energized.
Equipment is protected by double or reinforced insulation.
Safety Notes
Ÿ Do not exceed the maximum allowable input range of any function.
Ÿ Do not use when the instruments power is off.
Ÿ Remove the battery if the meter is to be stored for longer than 60 days.
Ÿ Improper use of this meter can cause damage, shock, injury or death.
Read and understand this user manual before operating the meter.
Ÿ Inspect the condition of the test coil and the meter itself for any damage
before operating the meter. Repair or replace any damage before use.
Ÿ Use with great care when making measurements if the voltages are
greater than 25V AC RMS or 35V DC. These voltages are considered a
shock hazard.
Ÿ If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
Cautions
Description
Meter Description
1. LCD display
2. Power button
3. Data Hold/BT wireless
transmit button
4. Inrush button
5. Hz button
6. Data storage button
7. Backlight button
8. Current coil plug
9. Flexible current coil
Display icons Description
HOLD Data Hold
3000 Counts
AC A Alternating Current
Low battery
Hz Hertz (Frequency)
INRUSH Inrush current
Memory storage
Bluetooth wireless transmit
Auto power off
Specifications
Note: Accuracy is given as ± (% of reading + counts of least significant digit)
at 23°C ± 5°C, with relative humidity less than 80%RH.
AC Current
50~400Hz
True RMS
Error
30.00A AC 0.01A ±(3.0% + 8d)
Range Resolution
Function
300.0A AC
3000A AC
0.1A
1A
±(3.0% + 5d)
±(3.0% + 5d)
Frequency:
50Hz- 400Hz
Accuracy and position error assumes centralized primary conductor at optimum
position, no external electrical or magnetic field, and within operating
temperature range.
Distance from
Optimum(mm)
Flexible coil radius (mm) Error
A
B
C
35
50
60
1.0%
1.5%
2.0%
Position Error of clamp:
General Specifications
Display 3000 counts backlit LCD
Low Battery indication " " is displayed
Over-range indication " OL " display
Operating Temperature 5°C to 40°C (41°F to 104°F)
Storage Temperature -20°C to 60°C (-4°F to 140°F)
Operating Humidity Max 80% up to 31°C (87°F) decreasing linearly to
50% at 40°C (104°F)
Storage Humidity <80%
Operating Altitude 2000 meters (7000 ft.) maximum.
Batteries 2 x AAA
Auto power OFF After approx. 15 minutes
Safety Standard EN61010-1, EN61010-2-032, EN61326-1.
Overvottage Category III 1000V and Category IV
600V, Pollution Degree 2.
Operation
AC Current Measurements
First twist and unlock the flexible current coil. Pull out the coil wire, loop
around the wire you would like to measure, twist and lock the current coil back
into place. Press the power button to switch on, the current value will be
displayed on the meter display.
Power button
Press the power button to boot, press and hold the power button to shut down.
Frequency button
In the process of measuring the AC current, the Hz key will enter the frequency
measurement mode, and the frequency value will be displayed on the LCD
screen.
Data Hold/ Button
In the alternating current AC current measurement and frequency
measurement process, press the HOLD button, the data will remain on the LCD
screen. Press and hold this button, to enter the Bluetooth transfer mode.
The LCD is equipped with backlighting for easier viewing, especially in dimly lit
areas. Press the backlight button to turn the backlight on. Press again to turn
the backlight off. Note that the meter does have an auto power off feature as
described below.
LCD Backlight Button
In order to save power, the meter will automatically shutdown after ±15
minutes when inactive. Press the power button once again to turn on meter.
Automatic Power OFF
INRUSH Button
INRUSH current measurement function, is in the manual measurement mode. The
need for the operator to predict the value of the inrush current and then select
the appropriate measuring range, to ensure the accuracy of the measurement.
Ÿ Press the "INRUSH" key to enter "INRUSH" measurement mode, LCD screen
displays "----", at this time the instrument is preset in the 3000A range.
Ÿ After entering the INRUSH measurement mode, hold down the "INRUSH"
key, it will then convert to a 30A measurement range; hold down again, it will
then convert to a 300A measurement range; hold down again, it will then
convert to 3000A measurement range.
Ÿ The preset range, starting with electrical equipment, inrush current value will
remain on the LCD screen. If you want to measure again, you need to re-enter
the measurement model.
Ÿ Enter the "INRUSH" mode, and then press the "INRUSH" key, you can exit
the measurement model.
Press the LOG key, the meter will display and will begin to record the current
changes in the known period of time data, and store it on the meter for the
Mobile APP to read and analyze. Hold down the key to enter Bluetooth mode,
the meter will display , the data will be sent to the Mobile APP in immediately.
With Bluetooth active, hold down the LOG key, the meter will display "SEND",
you can send the data stored in the data to the Mobile APP, select send the
complete automatic return to the measurement mode.
Note: Bluetooth Connect:
1. Turn on the Bluetooth function on the instrument using Menu Button
2. Turn on the Bluetooth of the Smartphone, press the Meterbox Pro icon and
enter into the home interface. Then press Connect Device icon on the home
interface, Bluetooth device name will appear.
3. Touch the device name listed in Bluetooth devices list to connect the meter.
Meterbox Pro for Android & iOS: Please search in the app stores with
keyword Meterbox Pro, download and run.
LOG Button
Ÿ Remove the Phillips head screw that secures the rear battery door.
Ÿ Open the battery compartment and replace the two 1.5V AAA batteries.
Ÿ Secure the battery compartment.
Maintenance
Cleaning and Storage
Wipe the case with a damp cloth and mild detergent; do not use abrasives or
solvents. If the meter is not going to be used for more than 60 days, remove
the battery.
Battery Replacement
www.major-tech.com www.majortech.com.au
MAJOR TECH (PTY) LTD
South Africa Australia
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