Major tech MT777 User manual

MT777
AC/DC TRMS
CLAMP METER
with Datalogger & Mobile APP
INSTRUCTION MANUAL
II

2

Contents Page no
3
1. Introduction ........................................................................... 4
2. Safety ..................................................................................... 5
3. Description ............................................................................ 6
3.1. Meter Description .............................................................. 6
3.2. Symbols Used on LCD Display ...........................................7
3.3. Key Description ................................................................. 7
4. Specifications ........................................................................ 8
4.1. AC/DC Current Measurements ......................................... 8
4.2. Inrush Current Measurements .......................................... 9
4.3. AC/DC Voltage Measurements ......................................... 9
4.4. AC+DC Voltage Measurements ..................................... 10
4.5. Frequency Measurements ............................................. 10
4.6. VFD Mode...................................................................... 10
4.7. LoZ AC Voltage Measurements ...................................... 11
4.8. Resistance Measurements ............................................. 11
4.9. Continuity Check ............................................................ 12
4.10. Diode Test ..................................................................... 12
4.11. Capacitance Measurements ......................................... 13
4.12. Temperature Measurements ......................................... 13
4.13. Flexible Coil Current Measurements.............................. 14
4.14. Using RANGE ............................................................... 14
4.15. Hold Mode ..................................................................... 15
4.16. Capturing Minimum and Maximum Values..................... 15
4.17. Relative Values ............................................................. 15
4.18. Capturing Peak Values.................................................. 15
4.19. Non-Contact AC Voltage Measurement......................... 16
5. Menu Operation ................................................................... 17
5.1. Settings Details .............................................................. 17
5.2. Data/Time Details........................................................... 17
5.3. Measurement Details ..................................................... 18
5.4. Recording Details ........................................................... 18
5.5. Meter Info Details ........................................................... 20
5.6. Factory Set Details.......................................................... 20
6. Maintenance ........................................................................ 20
6.1. Cleaning and Storage ..................................................... 20
6.2. Battery Replacement...................................................... 20
6.3. Temperature Probe Replacement................................... 20
7. Specifications ...................................................................... 21
7.1. Specifications ................................................................ 21
7.2. General Specifications.................................................... 23

4
1. Introduction
• Professional True RMS Industrial Digital Clamp meter and TFT color
LCD display, providing fast A/D converting sampling time with high
accuracy.
• It is easy to find and solve the problems of the production equipments
with Bluetooth technology.
• Safe measurements with double molded plastic housing design.
Measures:
• AC TRMS Current
• DC Current
• AC, AC+DC TRMS Voltage
• DC Voltage
• Resistance and Continuity Test
• Diode Test
• Capacity
• Frequency
• Duty Cycle
• Temperature with K-Type Probe
• Flexible Coils Current
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
Detailed information about Meterbox Pro available on the APP help file.
Meterbox Pro for Android:
Please search in Google Play with keyword Meterbox Pro, download and
run
Meterbox Pro for IOS:
Please search in the Apple Store with keyword Meterbox Pro, download and
run
Features:
• Trend Capture Function
• 100 Graph Data Review
• Menu Function
• Data Hold
• Peak Mode
• Max/Min Mode
• Relative Mode
• VFD AC Voltage
• INRUSH Current

5
This symbol, adjacent to another symbol or terminal, indicates
the user must refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under
normal use, hazardous voltages may be present.
Double insulation.
2. Safety
!
2.1. lnternational Safety Symbols
2.2. SAFETY NOTES
• Do not exceed the maximum allowable input range of any function.
• Do not apply voltage to meter when resistance function is selected.
• Set the function switch OFF when the meter is not in use.
• Remove the battery if meter is to be stored for longer than 60 days.
2.3. WARNINGS
• Set function switch to the appropriate position before measuring.
• When measuring volts do not switch to current/resistance modes.
• Do not measure current on a circuit whose voltage exceeds 600V.
• When changing ranges always disconnect the test leads from the circuit
under test.
2.4. CAUTIONS
• Improper use of this meter can cause damage, shock, injury or death.
Read and understand this user manual before operating the meter.
• Always remove the test leads before replacing the battery or fuses.
• Inspect the condition of the test leads and the meter itself for any
damage before operating the meter. Repair or replace if damaged before
use.
• Use great care when making measurements if the voltages are greater
than 25VAC rms or 35VDC. These voltages are considered a shock
hazard.
• Always discharge capacitors and remove power from the device under
test before performing Diode, Resistance or Continuity tests.
• Voltage checks on electrical outlets can be difficult and misleading
because of the uncertainty of connection to the recessed electrical
contacts. Other means should be used to ensure that the terminals are
not “live”.
• If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.

6
3.1. Meter Description
1-Current Clamp
2-Non-Contact AC Voltage Indicator Light
3-Clamp Trigger
4-Relative/INRUSH/ESC Button
5-LCD Display
6-MODE/VFD Button
7-RANGE Button
3. Description
8-MENU Button
9-Rotary Function Swith
10-Data Hold/Flashlight Button
11-Battery Cover
12-COM Input Jack
13-VΩHz% CAP TEMP Jack
14-Flashlight
WARNING
TO AVOID ELECTRICAL
SHOCK REMOVE TEST
LEADS BEFORE OPENING
CASE OR BATTERY COVER.
DO NOT OPERATE WITH
BATTERY COVER OPEN.
1.5V AAAX3
OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
11
2
4
6
7
8
9
10
3
1
14
12 13
10:18
A
1000
Mode Max Menu
5

7
1. Power Off Function
2. Key Beeper Function
3. Bluetooth Function
4. Automatic/Manual Mode
5. System’s Time
6. Battery Capacity
7. Measuring Unit
8. Measuring Result
9. Analogue Bar Graph
10. Function Keys
3.2. Symbols Used on LCD Display
1. MODE: Press the Mode key to switch the functions, and press for 2
seconds to switch to VFD AC Voltage when AC Voltage measurement.
2. RANGE: Press the Range key to manual range, and press for 2 seconds
to switch to auto range measurement.
3. MENU: Press the menu key to open the menu functions, and press the
range and menu soft key function for more measurement options.
4. REL: Press the Rel key for 2 seconds to switch to inrush function when
measuring 600 or 1000 A AC.
5. HOLD: Freezes the present reading in the display and allows the display
to be saved. Press for 2 seconds to turn the Flashlight on or off.
3.3. Key Description
13
256
4
7
8
9
10

8
4. Operation
NOTES: Read and understand all Warning and Caution statements in this
operation manual prior to using this meter.
NOTES: Set the function select switch to the OFF position when the meter
is not in use.
4.1. AC/DC Current Measurements
WARNING: Ensure that the test leads are disconnected from the meter
before making current clamp measurements.
1. Set the Function switch to the 1000A, 600A range, If the approx.
range of the measurement is not known, select the highest range then
move to the lower ranges if necessary.
2. Use the MODE button to select AC or DC.
3. Press the REL button to zero the meter display.
4. Press the trigger to open jaw. Fully enclose only one conductor. For
optimum results, center the conductor in the jaw.
5. The clamp meter LCD will display the reading.
CorrectIncorrect

9
OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
V
600.0
Mode Max Menu
Auto
0 3 6
OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
V
600.0
Mode Max Menu
Auto
0 3 6
4.2. Inrush Current Measurements
1. Set the function switch to the 600A or 1000A position.
2. Press the INRUSH button (Enter key for 2 seconds) to indicate “Inrush”
on the display. Then measurement display “----” .
3. Clamp the cable to be motor.
4. Start the motor.
5. Read the inrush current in the display.
4.3. AC/DC Voltage Measurements
WARNING: Risk of Electrocution. The probe tips may not be long enough
to contact the live parts inside some 240V outlets for appliances because
the contacts are recessed deep in the outlets. As a result, the reading may
show 0 volts when the outlet actually has voltage on it. Make sure the
probe tips are touching the metal contacts inside the outlet before
assuming that no voltage is present.
CAUTION: Do not measure AC/DC voltages if a motor on the circuit is
being switched ON or OFF. Large voltage surges may occur that can
damage the meter.
1. Set the function switch to the V AC/DC position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
3. Press the MODE key to switch AC or DC Voltage functions.
4. Read the voltage in the display.

10
4.4. AC+DC Voltage Measurements
CAUTION: Do not measure DC voltages if a motor on the circuit is being
switched ON or OFF. Large voltage surges may occur that can damage the
meter.
1. Set the function switch to the V AC/DC position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive V jack.
3. Press the MODE key to switch the V AC+DC Voltage functions.
4. Read the AC+DC voltage in the display.
4.5. Frequency Measurements
1. Set the function switch to the V AC/DC position.
2. Insert the black test lead banana plug into the negative COM jack. Insert
the red test lead banana plug into the positive V jack.
3. Press the menu key for 2 seconds refer soft key function for more
measurement options.
4. Press the soft key Hz key to switch the Hz functions.
5. Read the Frequency in the display.
6. Press the soft key Hz to switch the Duty functions.
7. Read the Duty in the display.
4.6. VFD Mode (Variable Frequency Drive)
1. Set the function switch to the V AC/DC to AC Voltage measurements.
2. Press the VFD button (MODE key for 2 seconds) to indicate “VFD” on
the display for variable frequency driver measurements.
3. Read Measurement in the display

OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
m
60.00
Mode Max Menu
0 3 6
Ω
11
4.7. LoZ AC Voltage Measurements
WARNING: Risk of Electrocution. The probe tips may not be long enough
to contact the live parts inside some 240V outlets for appliances because
the contacts are recessed deep in the outlets. As a result, the reading may
show 0 volts when the outlet actually has voltage on it. Make sure the
probe tips are touching the metal contacts inside the outlet before
assuming that no voltage is present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being
switched ON or OFF. Large voltage surges may occur that can damage the
meter.
1. Set the function switch to the VAC LoZ position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert red test lead banana plug into the positive V jack.
3. Read the voltage in the main display.
4.8. Resistance
Measurements
To avoid electric shock,
disconnect power to the unit
under test and discharge all
capacitors before taking any
resistance measurements.
Remove the batteries and
unplug the line cords.
1. Set the function switch to
the Ω CAP position.
2. Insert the black test lead
banana plug into the
negative COM jack. Insert
the red test lead banana
plug into the positive Ω
Jack.
3. Read the resistance in the
display. If the circuit is
open, the display will
indicate “OL”.

12
OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
3.000
Mode Max Menu
0 3 6
V
OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
50
Mode Max Menu
0 3 6
Ω
4.9. Continuity Check
WARNING: To avoid electric
shock, disconnect power to the
unit under test and discharge all
capacitors before taking any
resistance measurements.
Remove the batteries and unplug
the line cords.
1. Set the function switch to the
Ω CAP position.
2. Insert the black test lead
banana plug into the negative
COM jack. Insert the red test
lead banana plug into the
positive jack.
3. Press the MODE key to switch
the continuity functions.
4. If the resistance is less than
approximately 50Ω, the audible
signal will sound. If the circuit
is open, the display will
indicate “OL”.
4.10. Diode Test
1. Set the function switch to the
Ω CAP position.
2. Insert the black test lead
banana plug into the negative
COM jack and the red test
lead banana plug into the
positive V jack.
3. Press the MODE key to switch
the Diode functions.
4. Forward voltage will typically
indicate 0.400 to 3.000V.
Reverse voltage will indicate
“OL”. Shorted devices will
indicate near 0V and an open
device will indicate “OL” in
both polarities.

10:18
°C
1000
Mode Max Menu
Auto
OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
mF
100.0
Mode Max Menu
Auto
OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
13
4.11. Capacitance
Measurements
WARNING: To avoid electric
shock, disconnect power to the
unit under test and discharge all
capacitors before taking any
capacitance measurements.
Remove the batteries and unplug
the line cords.
1. Set the rotary function switch
to the Ω CAP position.
2. Insert the black test lead
banana plug into the negative
COM jack. Insert the red test
lead banana plug into the
positive V jack.
3. Press the MODE button to
switch the Capacitance
functions.
4. Read the capacitance value in
the Display.
4.12. Temperature
Measurements
1. Set the function switch to the
TEMP position.
2. Insert the Temperature Probe
into the input jacks, making
sure to observe the correct
polarity.
3. Read the temperature in the
display
4. Press the MODE key to switch
the Unit (°C or °F).

OFF
V
Hz%
CAP
Ω
Temp
°C°F
600A
AC/DC TRMS
CLAMP METER
WITH DATALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
A
3000
Mode Max Menu
0 3 6
3000A
14
4.13. Fexible Coil
Current Measurements
(use the MT740)
1. Set the function switch
to the Flexible coil
position.
2. Insert the black test lead
banana plug into the
negative COM jack.
Insert the red test lead
banana plug into the
positive V jack.
3. Read the Current in the
display.
4. Press the RANGE key to
switch range. 30A,
300A, 3000A.
4.14. Using RANGE
• Press the RANGE key to activate the manual mode and to disable the
Auto range function.
• The message “Manual” appears on the upper left part of the display
instead of “Auto”.
• In manual mode, press the RANGE key to change measuring range: the
relevant decimal point will change its position.
• The RANGE key is not active in positions , , ,%, Temp °C°F, 600A
ACDC, 1000A ACDC.
• In Auto range mode, the instrument selects the most appropriate ratio for
carrying out measurement.
• If a reading is higher than the maximum measurable value, the indication
“O.L” appears on the display.
• Press and hold the RANGE key for more than 1 second to exit the
manual mode and restore the Auto range mode.
Auto (or manual) mode fig below:

15
4.15. Hold Mode
• To freeze the display for any function,
press key HOLD. And again press key
HOLD to release freeze.
• Press soft key SAVE will store the
measurement to memory.
4.16. Capturing Minimum and
Maximum Values
• The MAX MIN Record mode captures
minimum, and maximum input values.
• When the input goes below the recorded
minimum value or above the recorded
maximum value, the Meter beeps and
records the new value.
• This mode is for capturing intermittent
readings, recording minimum and
maximum readings unattended, or
recording readings while equipment
operation precludes watching the Meter.
• To activate the MAX MIN mode, press soft
key max.
• If the Meter is already in MAX MIN
function, press max to turn MAX MIN
function off.
4.17. Relative Values
• To activate the relative mode, press the
REL key.
• If the Meter is already in the relative
function, press REL to turn REL MODE off.
4.18. Capturing Peak Values
• In VAC measures, To activate the peak
mode, press the soft key peak.
• If the Meter is already in the peak
function, press peak to turn Peak mode
off.

4.19. Non-Contact AC Voltage Measurement
WARNING: Risk of Electrocution. Before use, always test the voltage
detector on a known live circuit to verify proper operation.
1. Touch the probe tip to the live conductor or insert into the live side of
the electrical outlet.
2. If AC voltage is present, the detector light will illuminate.
Note: The conductors in electrical cord sets are often twisted. For best
results, move the probe tip along a length of the cord to assure placing
the tip in close proximity to the live conductor.
Note: The detector is designed with high sensitivity. Static electricity or
other sources of energy may randomly activate the sensor. This is
normal operation.
16
OFF
V
Hz%
CAP
Ω
Temp
°C
°F
600A
AC/DC TRMS
CLAMP METER
WITH DA
TALOGGER
1000A
CAT III 1000V
CAT IV 600V
CAP
V Hz%
Ω
Temp
COM
AUTO POWER OFF
VLoZ
ESC
Bluetooth
INRUSH
REL
RANGE MENU
MODE
2sec.
10:18
V
0
Mode Max Menu
Auto
036

5. Menu Operation
• Press Menu button to open the Menus, As show below
• Press soft key Up / Down to select menu item or change the value of
current focus item.
• Press soft key Enter to enter the submenu or set focus on the current
selected item.
• Press ESC button to return to the previous menu.
5.1. Settings Details
• Press soft key Up/Down to select setup item at main menu, and Press
soft key Enter to enter.
• Four options are available: Key Sound, Bluetooth, 12 Hour and APO
Time.
1.Key Sound: Use Up/Down button to set beep on or off.
2.Bluetooth: Use Up/Down button to turn Bluetooth on or off.
3.12 Hour: Use Up/Down button to set Time 12 Hour on or 24 Hour.
4.APO Time: Use Up/Down button to set Auto Power Off Time
15,30,45,60,and off.
5.2. Data/Time Details
• Press soft key Up/Down to select Data/Time item at main menu, and
Press soft key Enter to enter.
• In this menu, year, month, day, hour, minute can be set.
17

• This recalls all the measurements saved when the hold button was used
and the readings were saved, refer to 4.15 (Hold Mode)
• Recall Measurement Item can Recall store measurement in Memory.
• Delete Measurements item will Delete all data in Memory.
• Recall measurement fig is below:
18
5.3. Measurement Details
• Press soft key Up/Down to select Measurement item at Measurement
menu, and Press soft key Enter to enter the menu.
5.4. Recording Details
1. Press soft key Up/Down to select Recording item at main menu, and
press soft key Enter to enter Recording Function. Recording Menu is
below:
2. In Recording Menu. Press soft key Up/Down to select Setup New
Recording Item, and press soft key Enter to enter set Duration and
sample time. fig is below:

19
3. In Record Menu. Press soft key Up/Down to select Start recording Item,
and press soft key Enter to start one new recording.
4. In Record Menu. Press soft key Up/Down to select Recall recordings
Item, and press soft key Enter to enter recall recording in memory. Then
Press soft key Prev/Next view last or next recording. Fig is below:
And Press soft key Trend to expansion graph. Fig is below:
5. In Record Menu. Press soft key Up/Down to select Delete recordings
Item. and press soft key Enter to enter delete all recording function.

20
6. Maintenance
WARNING: To avoid electrical shock, disconnect the meter from any
circuit, remove the test leads from the input terminals, and turn OFF the
meter before opening the case. Do not operate the meter with an open
case.
6.1. Cleaning and Storage
• Periodically wipe the case with a damp cloth and mild detergent; do not
use abrasives or solvents.
• If the meter is not to be used for 60 days or more, remove the battery
and store it separately.
6.2. Battery Replacement
1. Remove the Phillips head screw that secures the rear battery door.
2. Open the battery compartment.
3. Replace the AAA battery.
4. Secure the battery compartment.
6.3. Temperature Probe Replacement
Note: To use a Type K thermocouple probe that is terminated by a
subminiature (flat blade) connector, a subminiature-to-banana plug adaptor
is required.
5.6. Factory Set Details
• Press soft key Up/Down to select Factory set item at main menu, and
Press soft key Enter to enter Factory set interface.
• Select “YES” button, System setting will be reset. Fig is below:
5.5. Meter Info Details
• Press soft key Up/Down to select Meter Info item at main menu, and
Press soft key Enter to enter Meter info interface.
• This menu contains software’s version, hardware’s version and Free
Memory.