Major tech MT723 User manual

AC/DC TRMS
CLAMP METER
INSTRUCTION MANUAL
MT723
II

2

Contents Page no
3
1. Safety ..................................................................................... 4
1.1. lnternational Safety Symbols ............................................ 4
1.2. SAFETY NOTES ............................................................. .4
1.3. WARNINGS ...................................................................... 4
1.4. CAUTIONS ....................................................................... 4
2. lnput Limits ............................................................................ 5
3. Meter Description .................................................................. 5
4. Symbols Used on LCD Display ............................................. 6
5. Specifications ....................................................................... 7
6. General Specifications ......................................................... 9
7. Operation ............................................................................. 10
7.1. AC Current Measurement ............................................... 10
7.2. AC Voltage Measurement ............................................... 11
7.3. DC Voltage Measurement ............................................... 11
7.4. Capacitance Measurements ........................................... 11
7.5. Frequency Measurements .............................................. 11
7.6. Resistance ..................................................................... 12
7.7. Temperature Measurements ........................................... 12
7.8. Diode Test ....................................................................... 12
7.9. Continuity Measurements ............................................... 13
7.10. Non-Contact AC Voltage Measurements ....................... 13
7.11.MODE/VFD ................................................................... 13
7.12.HOLD/Flashlight ........................................................... 13
7.13.RANGE ......................................................................... 14
7.14.PEAK/INRUSH ............................................................. 14
7.15. Relative/Backlight ......................................................... 14
7.16. Automatic Power OFF ................................................... 14
8. Maintenance ........................................................................ 15
9. Cleaning and Storage .......................................................... 15
10. Battery Replacement .......................................................... 15
11. Temperature Probe Replacement ..................................... 15

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.
Application around and removal from uninsulated hazardous
live conductors is permitted.
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1. Safety
!
1.1. lnternational Safety Symbols
1.2. 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.
1.3. 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.
1.4. 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.

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2. Input Limits
1. NCV Test
2. Current clamp
3. Non-contact AC voltage
indicator light
4. Clamp trigger
5. REL button
6. LCD display
7. RANGE button
3. Meter Description
8. COM input jack
9. Data Hold and Backlight button
10. Rotary Function switch
11. MODE select and Flashlight button
12. INRUSH and PEAK button
13. V Ω Diode Continuity CAP TEMP Hz%
jack
14. Battery Cover
A AC/DC
V AC/DC
Resistance, Capacitance,
Frequency, Diode Test,
Temperature
400A
1000V DC/AC
300V DC/AC
Function Maximum Input
1
2
3
4
5
6
7
8
9
11
12
13
14
10

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Data Hold
Negative reading display
Measurement display digits
REL/DCA Zero
Maximum/Minimum
Auto Power Off
Auto Range mode
Direct Current / Voltage
Alternating Current Voltage
Low battery
Milli-volts or Volts (Voltage)
(Resistance)
Amperes (Current)
Farad (Capacitance)
Hertz (Frequency)/Percent (duty ratio)
Fahrenheit and Celsius units (Temperature)
Unit of measure prefixes: nano, milli, micro, mega, and kilo
Continuity test
Diode test
4. Symbols Used on LCD Display

Range
40.00A
400.0A
Accuracy ±(% of reading+digits)
±(2.0% + 8 digits)
±(2.5% + 8 digits)
Function
DC Current
Over range protection: Maximum input 400A.
Resolution
10mA
100mA
Range
40.00A
400.0A
Accuracy ±(% of reading+digits)
±(2.0% + 8 digits)
±(2.5% + 8 digits)
Function
AC True RMS Current
Over range protection: Maximum input 400A.
Accuracy specified from 5% to 100% of the measuring range.
Frequency Response: 50Hz to 60Hz True RMS.
Inrush current Maximum Input: 400A Inrush current Sensitivity: >2A.
Resolution
10mA
100mA
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5. Specifications
400.0V ±(1.0% + 3 digits)
100mV
1000V ±(1.2% + 3 digits)
1V
Range
4.000V
40.00V
Accuracy ±(% of reading+digits)
±(1.0% + 3 digits)
±(1.0% + 3 digits)
Function
DC Voltage
Maximum input: 1000V DC
Resolution
1mV
10mV
400.0V ±(1.2% + 5 digits)
100mV
1000V ±(1.5% + 5 digits)
1V
Range
4.000V
40.00V
Accuracy ±(% of reading+digits)
±(1.2% + 5 digits)
±(1.2% + 5 digits)
Function
AC True RMS Voltage
Variable frequency Drive TEST AC voltage range: 100V---600V.
AC voltage bandwidth: 50 to 1000Hz (sine) 50/60 (all wave)
Accuracy specified from 5% to 100% of the measuring range
Maximum Input: 1000V AC RMS.
PEAK Maximum Input: 1000V
Resolution
1mV
10mV
(with VFD)
40.00kΩ±(1.5% + 2 digits)
10Ω
400.0kΩ±(1.5% + 2 digits)
100Ω
Range
400.0Ω
4.000kΩ
Accuracy ±(% of reading+digits)
±(1% + 4 digits)
±(1.5% + 2 digits)
Function
Resistance
Input Protection: 300V DC or 300V AC RMS
Resolution
0.1Ω
1Ω
4.000MΩ±(2.0% + 5 digits)
1kΩ
40.00MΩ±(3.0% + 8 digits)
10kΩ

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(Auto-ranging)
99.99mF ±(5% + 5 digits)
0.01mF
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9.999µF 0.001µF
99.99µF ±(3.0% + 5 digits)
0.01µF
Range
99.99nF*
999.9nF
Accuracy ±(% of reading+digits)
±(4.5% + 20 digits)
Function
Capacitance
Input Protection: 300V DC or 300V AC RMS.
* < 99.99nF (no specification)
Frequency with test leads (AC Voltage)
Resolution
0.01nF
0.1nF
999.9µF 0.1µF
9.999mF 0.001mF
Range
10Hz to 100kHz
Accuracy ±(% of reading+digits)
±(1.0% + 5 digits)
Function
Frequency
Input Protection: 1000V AC RMS
Sensitivity: > 15V AC RMS
Frequency (AC Current)
(Auto-ranging)
Range
45Hz to 1kHz
Accuracy ±(% of reading+digits)
±(1.0% + 5 digits)
Function
Frequency
Sensitivity: > 20A
(Auto-ranging)
Range
20.0% to 80.0%
Accuracy ±(% of reading+digits)
±(1.2% + 10 digits)
Function
Duty Cycle
Resolution
0.1
Sensor: Type K Thermocouple
Input Protection: 300V DC or 300V AC RMS.
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Range
-20.0 to 1000°C
-4.0 to 1832°F
Accuracy ±(% of reading+digits)
±(3% + 3°C)
Function
Temperature
Resolution
0.1/1°C
0.1/1°F
(Type-K) ±(3% + 5°F)
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Input Protection: 300V DC or 300V AC RMS.
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Testing Condition
Forward DCA is approx .1mA,
open circuit voltage MAX 3V
Reading
Forward voltage drop of Diode
Function
Diode
Test current MAX 1.5mA
While resistance is less than (50Ω)
Buzzer makes a long sound,
Continuity

9
Clamp jaw opening
Display
Low Battery indication
Over-range indication
Measurement rate
Temperature sensor
Input Impedance
AC response
ACV Bandwidth
Operating Temperature
Storage Temperature
Operating Humidity
Storage Humidity
Operating Altitude
Battery
Battery life
Auto power OFF
Dimensions
Weight
Safety
30mm approx.
3-3/4 digits (4000 counts) backlit LCD
‘ ' is displayed
'OL' display
3 readings per second, nominal
Type K thermocouple
10M (VDC and VAC)
True RMS (AAC and VAC)
2KHZ
5°C to 40°C (41°F to 104°F)
-20°C to 60°C (-4°F to 140°F)
Max 80% up to 31°C decreasing linearly to
50% at 40°C
<80%
2000 meters maximum.
Three (3) x 1.5V AAA Battery
~30h (backlight ON), ~100h (backlight OFF)
After approx. 15 minutes
220 x 80 x 39mm
305g
For indoor use and in accordance with the
requirements for double insulation to
IEC1010-1 (2001): EN61010-2-030
EN61010-2-032 EN61010-2-033 Overvoltage
Category lll 600V, Pollution Degree 2.
6. General Specifications

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7. Operation
NOTES: Read and understand all Warning and Caution statements in this
operation manual prior to using this meter. Set the function select switch to
the OFF position when the meter is not in use.
7.1. 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 400A range. If the approx. range of the
measurement is not known, select the highest range then move to the
lower ranges if necessary.
2. Press the REL button to zero the meter display.
3. Use Rotary Function switch to select AC or DC 40A 400A range.
4. Use MODE Button to select AC or DC.
5. Select AC current Test, press the INRUSH key to turn Inrush current test,
the LCD will display "----".
6. Press the trigger to open jaw. Fully enclose only one conductor. For
optimum results, center the conductor in the jaw.
7. The clamp meter LCD will display the reading.
CORRECTINCORRECT

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7.2. AC Voltage Measurement
1.lnsert the black test lead into the negative COM terminal and the red
test lead into the positive V CAP·TEMP·Hz%
Ω terminal.
2. Set the function switch to the V~ position.
3. Press the MODE/VFD key for 1 second to turn on the VFD test.
4. Press the PEAK key to tum on Peak test.
5. Connect the test leads in parallel to the circuit under test.
6. Read the voltage measurement on the LCD display.
7.3. DC Voltage Measurement
1. lnsert the black test lead into the negative COM terminal and the red
test lead into the positive V CAP·TEMP·Hz%
Ω terminal.
2. Set the function switch to the V~ position.
3. Connect the test leads in parallel to the circuit under test.
4. Read the voltage measurement on the LCD display.
7.4. Capacitance Measurements
WARNING: To avoid electric shock, discharge the capacitor under
test before measuring.
1. Set the function switch to the CAP position.
2. lnsert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the V CAP TEMP Hz%
Ω
positive jack.
3. Touch the test probe tips across the part under test. If "OL" appears
in the display, remove and discharge the component.
4. Read the capacitance value in the display.
5. The display will indicate the proper decimal point and value.
Note: For very large values of capacitance measurement it can take
several minutes before the final reading stabilizes.
7.5. Frequency Measurements
1. lnsert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the V CAP TEMP Hz%
Ω
positive jack.
2. Set the function switch to the V~HZ/% Position.
3. Press MODE button to select the Frequency (Hz) or Duty cycle (%).
4. Touch the test probe tips across the part under test.
5. Read the value on the display.
6. The display will indicate the proper decimal point and value.

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7.6. Resistance
1. lnsert the black test lead into the negative COM terminal and the red
test lead into the V CAP TEMP Hz% positive terminal.
2. Set the function switch to the
Ω position.
3. Touch the test probe tips across the circuit or component under test.
4. Read the resistance on the LCD display.
7.7. Temperature Measurements
1. Set the function switch to the TEMP position.
2. lnsert the Temperature Probe into the negative COM and the
V CAP TEMP Hz%
Ωpositive jacks, observing polarity.
3. Touch the Temperature Probe head to the device under test.
Continue to touch the part under test with the probe until the
reading stabilizes.
4. Read the temperature on the display. The digital reading will indicate
the proper decimal point and value.
5. Use the MODE button to select °F or °C.
WARNING: To avoid electric shock, be sure the thermocouple
probe has been removed before changing to another measurement
function.
7.8. Diode Test
1. lnsert the black test lead banana plug into the negative COM jack
and the red testlead banana plug into the V· ·CAP·TEMP·Hz%
·Ω positive jack
2. Turn the function switch to
Ω position. Use the MODE button
to select the diode function if necessary (diode symbol will appear
on the LCD when in Diode test mode)
3. Touch the test probe tips to the diode or semiconductor junction
under test. Note the meter reading
4. Reverse the test lead polarity by reversing the red and black leads.
Note this reading
5. The diode or junction can be evaluated as follows:
• If one reading displays a value (typically 0.400V to 0.900V) and
the other reading displays OL, the diode is good.
• If both readings display OL the device is open.
• If both readings are very small or '0', the device is shorted.

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7.9. Continuity Measurements
1. lnsert the black test lead into the negative COM terminal and the red
test lead into the V CAP TEMP Hz%
Ω positive terminal.
2. Set the function switch to the
Ω position.
3. Use the MODE button to select continuity " ". The display icons will
change when the MODE button is pressed.
4. Touch the test probe tips across the circuit or component under test.
5. lf the resistance is < 50Ω, a tone will sound.
7.10. Non-Contact AC Voltage Measurements
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. lf AC voltage is present, the detector light will illuminate.
NOTE: The conductors in electrical cord sets are often twisted. For best
results, rub 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 trip the sensor. This is normal
operation.
7.11. MODE/VFD (Variable Frequency Drive)
1. Press MODE/ VFD key to select the double measurement functions.
This key is active in V CAP
Ω position to select among resistance
test, diode test, continuity test, HZ%, and in Temp position to select
between °F or °C.
2. Press and hold the MODE/VFD key and turn the selector switch to turn
the system on, the auto power off function will be cancelled.
3. Press and hold the MODE/VFD key for 2 seconds to switch to VFD.
7.12. HOLD/Flashlight
1. To freeze the LCD reading, press the Hold/Flashlight button. While
data hold is active,the HOLD icon appears on the LCD. Press the
button again to return to normal operation.
2. The LCD is equipped with backlighting for easier viewing, especially in
dimly lit areas.
3. Press the Hold/Flashlight button to turn the Flashlight on. Press again
to turn the Flashlight off.

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7.13. RANGE
Press the RANGE key to activate the manual mode and to disable the
Autorange function. The symbol "AUTO" disappears from the upper left
part of the display. 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 , , CAP, Hz%,Temp °C °F. In
Autorange mode, the instrument selects the most appropriate ratio
for carrying out measurement. If a reading is higher than the maximum
measurable value, the indication "0L" appears on the display. Press and
hold the RANGE key for more than 1 second to exit the manual mode and
restore the Autorange mode.
7.14. PEAK/INRUSH
1. In AC voltage test mode, Press PEAK/INRUSH key, the peak maximum
and peak minimum values can be measured.
2. In current test mode, Press INRUSH key the inrush current values are
measured.
7.15. Relative/Backlight
1. Press the REL button to zero the display. "REL" will appear in the
display. The displayed reading is now the actual value less the stored
"zero" value.
2. Press the REL button to view the stored value. "REL" will flash in the
display.
3. To exit this mode, press and Hold the REL button until "REL" is no
longer in the display.
4. DCA measurements Press the REL button to zero the display
5. Press and hold the REL/Backlight button to turn the Backlight on.
Press and hold again to turn the Backlight off.
7.16. Automatic Power OFF
1. In order to conserve battery life, the meter will automatically turn off
after approximately 15 minutes. To turn the meter on again, turn the
function switch to the OFF position and then to the desired function
position.
2. Press and hold the MODE/VFD key and turn the selector switch to turn
the system on, the auto power off function will be cancelled.

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8. 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.
9. Cleaning and Storage
1. 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.
10. Battery Replacement
1. Rotate battery door lock 180 degrees to open the battery door
2. Open the battery compartment
3. Replace the 3 x 1.5V AAA battery
4. Secure the battery compartment
11. Temperature Probe Replacement
1. The replacement bead wire probe (with K-Type plug) is part number
MT660.
2. The replacement temperature adaptor (with banana plug) is part number
MT802.

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MAJOR TECH (PTY) LTD
South Africa Australia