MAG TOOLS EM720C Manual de usuario
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
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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.
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