MAG TOOLS EM720C User manual

EM720C
AC/DC clamp meter
Instruction Manual
MACTOOLS.COM
© 2018 Mac Tools
505 N. Cleveland Ave. - Westville, Ohio 43082 I 800.MACTOOLS
U.S. and Canada Only I EE.UU. y Canadá Únicamente
É.-U. et Canada Seulement
Made in China I Hecho en china I Fabriqué en chine
CAT III 600V

MACTOOLS.COM
2
SUMMARY
Introduction 3
Safety information 3
• Precautions 4
• Safety symbols 5
Description 6
• Front panel 6
• Display 8
Using the meter 9
• Smart Function Measurement 9
• Auto Power Off 9
• DC Voltage 9
• AC Voltage 10
• AC Current 10
• DC Current 10
• Resistance 11
• Continuity 11
• Frequency/Duty Cycle 12
Specifications 12
• General Specifications 12
• Technical Specifications 12
Maintenance 15
• General Maintenance 16
• Replacing the Batteries 16
• Replacing Test Leads 17
Accessories 17

800.MACTOOLS 3
INTRODUCTION
WARNING
Make sure to read and follow all safety procedures
to avoid electric shock and/or injury.
The meter is a safe, reliable, yet small handheld digit digital clamp
meter. Capable of measuring AC/DC current, AC/DC voltage, resis-
tance, and continuity, it’s ideal for both home users and professionals.
SAFETY INSTRUCTIONS
The meter is designed and manufactured according to safety requi-
rements of EN 61010-1, EN 61010-2-032, EN 61010-2-033 on
electronic measuring instrument and hand held digital multipurpo-
semeter. And conforms to UL STD.61010-1,61010-2-032,61010-
2-033, Certified to CSA STD.C22.2 NO.61010-1, 61010-2-032,
61010-2-033.The product meets with the requirements of 600V
CAT III and pollution degree 2.
All safety guidelines outlined should be followed otherwise the pro-
tection provided by the instrument may be impaired.
Warning symbols in the manual alert users of potential dangerous situa-
tions. Precautions are to prevent the user from damaging the instrument or
the test object.

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The normal function of the product may be disturbed by strong Elec-
tro-Magnetic Interference. If so, simply reset the product to resume normal
operation by following the instruction manual. In case the function could
not resume, please use the product in other location.
2.1 Precautions
To avoid possible electric shock, personal injury or damage to the meter,
please observe the following:
1. Before using the meter, check the meter for damage during transport.
2. Check the test leads for damage to the insulation or wires before use.
3 Ensure the meter works properly by testing a known voltage first. If not
working properly, have the meter serviced before using.
4. Never exceed the protection limit values indicated in the specifications
for each range of measurement.
5. Always use caution when making voltage measurements above 60V dc
or 30V ac rms.
6. Make sure to use the correct input jacks and function.
7. Do not place the meter in any environment with dust, explosive gas or
vapor.
8. Always keep fingers behind the probe barriers.
9. Connect the common test lead first, then the hot lead. Disconnect in
reverse order.
10. Turn off power and discharge capacitors before measuring resistance,
diodes or continuity.
11. Failure to follow safety guidelines may prevent the meter’s built in
protection from working properly.
12. To avoid damage or incorrect readings, check for AC voltage present
before making DC voltage measurements.
13. Do not use the meter with the battery cover not securely in place.
14. When the « » symbol appears, replace the batteries to avoid incor-
rect readings.
15. Before opening the case, always disconnect test leads from all ener-
gized circuits.
16. Only use the test leads provides with the multimeter, or replace them
by identical cables having the same characteristics.
17. Do not touch input jacks during measurement to avoid electric shock.
18. Before switching functions, remove test leads from an circuit.

800.MACTOOLS 5
2.2 Safety Symbols
Important safety information. Read the manual.
Application around and removal from UNINSULATED HAZARDOUS
LIVE conductors is permitted.
Caution, possibility of electric shock.
Equipment protected throughout by double insulation or reinforced
insulation.
Complies with European (EU) safety standards.
Earth (ground) TERMINAL.
AC voltage/current
DC voltage/current
CONFORMS TO UL STD 61010-1, 61010-2-032
and 61010-2-033; CERTIFIED TO CSA STD C22.2
NO. 61010-1, 61010-2-032, 61010-2-033
CAT III:
Applicable to test and measuring circuits connected to the distribution part
of the building’s low-voltage MAINS installation. Example: fi xed equipment
switchboards, circuit breakers, wiring, including cables, bus bars, junction
boxes, switches, sockets, utput terminals on devices for industrial use and
other equipment.

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DESCRIPTION
3.1 Front Panel
1
2
3
5
4
6
7
8
9
10
11
1
2
3
5
4
6
7
8
9
10
11
1
2
3
5
4
6
7
8
9
10
11

800.MACTOOLS 7
1 Current Clamp
For measuring AC/DC current.
2. Safety barrier
Helps to keep hands from touching conductors while measuring current.
3. Rotary Switch
Used to select function and range.
4. MAX/MIN
Press the key to show the maximum reading value among measuring
data, and the “MAX” symbol appears on the display, press the button
again, the “MIN” symbol appears on the display and will show the mini-
mum reading value among measuring data, press the key third time to
return to normal mode.
5. Backlight
Press the key to turn on the backlight. Press the key again to manually
turn off the backlight.
6. Display
Max. display value: 5999
7. Input Jack
Connection for the live (red) test lead for voltage, resistance, capaci-
tance, diodes and continuity.
8. COM Jack
Connection for the common (black) test lead.
9. A-HOLD
Press the key to keep the reading on the screen unless the data is more
than 5%. Press the key button again to return the display to normal.
10. Clamp Trigger
Press the trigger to open the clamp jaw; release to close.
11. Worklight
When the rotary switch is in one of the current positions and the
Worklight is turned on, the worklight will turn off in a minute.

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3.2 Display
SYMBOL DESCRIPTION
Auto-range
AC voltage/current
DC voltage/current
Low Battery
Percentage (duty cycle)
Hertz (frequency)
Volts (Voltage)
Amps (Current)
Ohms (resistance)
Continuity
Display Hold
Polarity Indicator (Negative)
Ω, kΩ, MΩ
AUTO
%
H z
V
A
Ω, kΩ, MΩ
AUTO
%
H z
V
A
Ω, kΩ, MΩ
AUTO
%
H z
V
A

800.MACTOOLS 9
USING THE METER
4.1 SMART Function Measurement
Move the rotary switch to the “SMART” position. The default mode
is “AC Current”, “DC Current”, “AC Voltage”, “DC Voltage”, “Resis-
tance” or “Continuity”.
Connect the test leads across the circuit or load to be measured. It
will be an Automatic judgement on the LCD display. When used the
meter to measure the AC/DC current, the meter also can display the
measurement (for example DCV or ACV or ohms or continuity) that
measured from the jaw of the meter at the same time.
4.2 Auto Power Off
If the meter is not used for approx.15 min., the meter will automati-
cally turn itself off to conserve battery power. To turn the meter back
on after auto off, press the “A-HOLD” button.
4.3 DC Voltage
1. Insert the red test lead in the “INPUT” jack and the black lead in
the “COM” jack.
2. Move the rotary switch to the“V ”position.
The default mode is DC voltage. Connect the test leads across the
circuit or load to be measured.
3. Read measured voltage on the display.
CAUTION
Use extra caution when measuring high voltages to
avoid electric shock or damage.
WARNING
Do not attempt to measure voltages above 600V DC
to prevent injury or damage to the meter.

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4.4 AC Voltage
1. Insert the red test lead in the “INPUT” jack and the black lead in
the “COM” jack.
2. Move the rotary switch to the “V
Ω, kΩ, MΩ
AU TO
%
H z
V
A
”position. Connect the test leads
across the circuit or load to be measured.
3. Read measured voltage on the display.
CAUTION
Use extra caution when measuring high voltages to
avoid electric shock or damage.
WARNING
Do not attempt to measure voltages above 600V AC
to prevent injury or damage to the meter.
4.5 AC Current
1. Move the rotary switch to the “A
Ω, kΩ, MΩ
AU TO
%
H z
V
A
” position with the proper range.
2. Press the trigger and insert one conductor inside the jaws. Only
clamp one conductor, multiple conductors with different current
directions will cancel out readings.
3. Read measured current and the frequency value on the LCD
display.
4.6 DC Current
1. Move the rotary switch to the “A
Ω, kΩ, MΩ
AU TO
%
H z
V
A
” position with the proper range
2. Press the trigger, open the clamp and insert one conductor inside
the jaws only clamp one conductor multiple conductors with diffe-
rent current directions will cancel out readings.
3. Read measured current on the LCD display.

800.MACTOOLS 11
4.7 Resistance
1. Turn off all power and discharge capacitors on the circuit under
test.
2. Insert the red test lead in the “INPUT” jack and the black lead in
the “COM” jack.
3. Move the rotary switch to the “ Ω” position. Connect the test leads
across the circuit to be measured.
4. Read measured resistance on the LCD display. Tips for measuring
resistance:
- Sometimes the resistor value and measured resistance differ. This
is due to the meter’s output test current goes through all possible
paths between leads.
- For low resistance measurements, short the test leads and record
the resistance displayed. Then connect to the circuit and subtract
the recorded resistance from the measurement for the most
accurate results.
- When leads are disconnected or measurement is out of range,
“OL” is displayed.
WARNING
To avoid injury or damage to the meter, make sure to turn off all
power and discharge all capacitors before measuring resistance.
4.8 Continuity
1. Turn off all power and discharge capacitors on the circuit under test.
2. Insert the red test lead in the “INPUT” jack and the black lead in
the “COM” jack.
3. Move the rotary switch to the “
Ω, kΩ, MΩ
AU TO
%
H z
V
A
Ω” position. Connect the test
leads across the circuit to be measured. Read measured resistance
on the display. If the measured resistance is less than 40Ω, the
meter’s buzzer will sound.
WARNING
To avoid injury or damage to the meter, make sure to turn off all
power and discharge all capacitors before measuring continuity.

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4.9 Frequency/Duty Cycle
1. Insert the red test lead in the “INPUT” jack and the black lead in
the “COM” jack.
2. Move the rotary switch to the “Hz%” position. Connect the test
leads across the circuit to be measured.
3. Read measured resistance on the display.
4. Read measured duty cycle on the display.
SPECIFICATIONS
5.1 General Specifications
• Safety rating: CAT III 600V
• Max. operating altitude: 2000m
• Operating temperature: 0~40°C, <80% RH
• Storage temperature: -10~60°C, <70% RH (battery removed)
• Coefficient: 0.1 accuracy/°C
• Max. voltage between terminals and ground: 600V DC or AC rms
• Sample rate: Approx. 3 times/sec
• Display: digit LCD (max. display: 5999/1999 (Resistance))
• Over-range indication: Display only shows “OL”
• Low battery indication: When battery voltage drops below operating
voltage, « » symbol appears on the display
• Polarity indication: automatically displays “-”
• Power: 3x 1.5V AAA batteries
• Dimensions: 215mmX79mmX39mm
• Weight: 195g
• Max. jaw opening: 26mm
5.2 Technical Specifications
Accuracy: ±(% of reading + digits), 1 year warranty.
Ambient temp: 18°C~28°C, humidity: <75%.
Temperature coefficient: 0.1accuracy/°C
(0°C~18°C or 28°C~40°C).

800.MACTOOLS 13
5.2.1 DC Voltage
- Input impedance: 10MΩ.
- Overload protection: 600V DC or AC rms.
- Max. input voltage: 600V DC.
NOTE: the minimum measurement of DC voltage and AC voltage is
>=1.
NOTE : When alternating current is detected at either the DC voltage
or the AC voltage shift, the LCD will display « Err ».
5.2.2 AC Voltage
- Input impedance: 10MΩ.
- Overload protection: 600V DC or AC rms.
- Max. input voltage: 600V AC.
- Frequency range: 45Hz~65Hz.
- Response: Average; calibrated to rms sine wave.
5.2.3 AC Current
Range Resolution Accuracy
6V 0.01V
± (0.5% of reading + 3 digits)60V 0.1V
600V 1V
Range Resolution Accuracy
6V 0.01V
± (0.8% of reading + 5 digits)60V 0.1V
600V 1V
Range Resolution Accuracy
20A 0.01A ± (2.5% of reading + 8 digits)
200A 0.1A
600A 1A ± (3.0% of reading + 10 digits)

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- Frequency range: 45Hz~65Hz.
- Max. input current: up to 600A for no more than 60 seconds.
- Response: Average; calibrated to rms sine wave.
NOTE: Only when the current value is greater than 0.2A, the meter
will show its frequency value.
NOTE: When there is voltage or resistance detected in the AC current
shift, the LCD will display «Err».
5.2.4 DC Current
- Max. input current: up to 600A for no more than 60 seconds.
NOTE: When there is voltage or resistance detected in the AC current
shift, the LCD will display «Err».
5.2.5 Resistance
- Open circuit voltage: approx. 0.4V.
- Overload protection: 250V DC or AC rms.
Range Resolution Accuracy
20A 0.01A ± (2.5% of reading + 8 digits)
200A 0.1A
600A 1A ± (3.0% of reading + 10 digits)
Range Resolution Accuracy
2kΩ0.001kΩ
± (0.8% of reading + 3 digits)
20kΩ0.01kΩ
200kΩ0.1kΩ
2MΩ0.001MΩ
10MΩ0.01MΩ± (1.0% of reading + 5 digits)

800.MACTOOLS 15
5.2.6 DC Voltage
- Open circuit voltage: approx. 0.4V.
- Overload protection: 250V DC or AC rms.
5.2.7 Frequency (V position)
- Measuring range: 40~3kHz.
- Input voltage range: ≥1V AC rms. (measured frequency will increase
as the input voltage increases.
- Overload protection: 600V DC or AC rms.
5.2.8 Duty Cycle
MAINTENANCE
WARNING
Protection impairment if used in a manner not
specified by the manufacturer.
Range Function
If the measured resistance is less than 40Ω,
the meter’s buzzer will sound.
Range Resolution Accuracy
60Hz 0.1Hz
± (1.0% of reading + 5 digits)600Hz 1Hz
3kHz 10Hz
Range Resolution Accuracy
10% ~ 90% 1% ± 2%
Ω, kΩ, MΩ
AUTO
%
H z
V
A

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6.1 General Maintenance
This section provides basic maintenance principles, including cleaning
and battery replacement.
Do not attempt to do any repair or calibration to the meter unless you
are experienced maintenance personnel.
WARNING
Remove test leads from meter before opening the
battery cover to avoid damage or injury.
Use a damp cloth and a small amount of detergent to clean
the meter regularly. Do not use abrasives or chemical
solvents. Dirty or wet input jacks can affect readings.
To clean the input jacks:
1. Turn off meter and remove test leads.
2. Wipe any debris off input jacks.
3. Use a cotton swab with a cleaner/lubricant to clean jacks.
4. Use a new swab for each jack to prevent cross contamination.
6.2 Replacing The Batteries
WARNING
To avoid false reading that can lead to injury or
damage to the meter, replace the battery as soon as
the low battery symbol “ ” appears. Remove test
leads and disconnect from all circuits before opening
the battery cover.
To replace the batteries:
1. battery Specifications : size AAA 1.5V.
2. Turn off the meter and remove test leads.
3. Unscrew the battery cover.
4. Replace the used batteries with new ones. Be sure to observe
polarity when replacing batteries.
5. Replace battery cover and tighten before use.

800.MACTOOLS 17
6.3 Replacing Test Leads
WARNING
Use meet EN 61010-031 standard, rated CAT III 600V
or better Test leads.
WARNING
When replacing test leads, only use similar leads or
leads with same specs as those provided.
Lead specs: 600V, 10A.
Replace test leads if leads become damaged or worn.
ACCESSORIES
User’s manual 1 piece
Test leads 1 pair
Case 1 piece
AAA batteries (1.5V) 3 pieces
DISPOSAL OF THIS ARTICLE
Dear Customer, If you at some point intend to dispose
of this article, then please keep in mind that
many of its components consist of valuable
materials, which can be recycled.
Please do not discharge it in the garbage bin,
but check with your local council
for recycling facilities in your area.

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EM720C
Pinza amperimétrica de CA/CC
Guia de instrucciones
CAT III 600V
MACTOOLS.COM
© 2018 Mac Tools
505 N. Cleveland Ave. - Westville, Ohio 43082 I 800.MACTOOLS
U.S. and Canada Only I EE.UU. y Canadá Únicamente
É.-U. et Canada Seulement
Made in China I Hecho en china I Fabriqué en chine

MACTOOLS.COM
20
ÍNDICE
Introducción 21
Información de seguridad 21
• Precauciones 22
• Símbolos de seguridad 23
Descripción 24
• Panel frontal 24
• Pantalla 26
Usar el medidor 27
• Medición con función SMART 27
• Apagado automático 27
• Voltaje de CC 27
• Voltaje de CA 28
• Corriente de CA 28
• Corriente de CC 28
• Resistencia 29
• Continuidad 29
• Ciclo de frecuencia/servicio 30
Especificaciones 30
• Especificaciones generales 30
• Especificaciones técnicas 30
Mantenimiento 33
• Mantenimiento general 34
• Sustituir las pilas 34
• Sustituir los cables de prueba 35
Accessorios 35