MAC TOOLS EM720T User manual

EM720T
Digital Multimeter
Instruction Manual
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
2
SUMMARY
Introduction 3
Safety information 4
Safe Working Habits 4
Electric Symbols 6
Meter Instructions 7
• Meter Appearance 7
• Display 8
Keys Operation 8
• FUNC Key 8
• DATA HOLD Key 8
• MAX/MIN Key 9
• Backlight Key 9
• Automatic Power-Off Function 9
Measuring Operation 9
• SMART Key Function Measurement 9
• AC/DC Voltage Measurement 10
• Resistance and Continuity Measurement 10
• Clamp head Converter Measurement Display 11
(AC Current)
• Clamp head Converter Measurement Display 11
(DC Current)
General Specifications 12
• Accuracy lndicators 12
• DC Voltage 13
• AC Voltage 13
• Resistance 13
• Continuity Measurement 14
• Frequency 14
• AC Current 14
• Duty Ratio 15
Maintenance 15
• General Maintenance 15
• Replacing the Batteries 16
• Replacing Test Leads 16
Accessories 17

800.MACTOOLS 3
INTRODUCTION
WARNING
To avoid electric shock or personal injury, please read
“safety information” and “warning and related notes”
carefully before using the meter.
WARNING
The special attention should be paid when using the meter because
the improper usage may cause electric shock and damage the meter.
The safety measures in common safety regulations and operating
instruction should be complied with when using.
In order to make fully use of its functions and ensure safe operations
please comply with the usage in this section carefully.
This meter is a small hand-held, safe and reliable digital auto
measuring range multi-meter with stable performance and novel
structure. It can be used to measure AC DC voltage, resistance,
frequency, duty ratio, continuity and display the measured data of
the current probe (FACOM 720.P1500 or 720.P30). It is an ideal
maintenance tool easily carried by a large number of users.

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SAFETY INSTRUCTIONS
This digital multi-meter has been designed according to International
Electro Safety Standard EN 61010-1, EN 61010-2-030,
EN 61010-2-033 concerning safety requirements for electronic
measuring instruments and hand-held digital multi-meters. It meets
the requirements for CAT lIl 600V of EN 61010-. EN 61010-2-030,
EN 61010-2-033 and grade 2 for pollution.
• Users should use the meter strictly according to the provisions of
this manual. Otherwise, the warranty for the meter may become
invalid.
• The warnings in the user manual are used to remind users of
possible danger or dangerous action.
• The notes in the user manual are used to remind users of possible
meter damage or condition or action of measured object.
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.
SAFE WORKING HABITS
To avoid possible electric shock or personal injury as well as damage
to the meter or measured objects, please use the meter according to
the following procedures methods:
• Check the case before using the meter. Don’t use the meter with
damaged case. Check to see if the case is cracked or lacks plastic
parts. Please pay special attention to the joint insulating layer.
• Check to see if the test wire has insulation damage or bare metal.
Check test wire continuity. If the wire is damaged, please replace it
with a new one before using the meter.
• Measure known voltage with the meter to verify that the meter is
working properly. If the meter is working abnormally, stop using it
immediately. A protective device may be damaged. If there is any
doubt, please have the meter inspected by a qualified technician.

800.MACTOOLS 5
• Do not test voltage exceeding rated voltage marked on the meter
(600V).
• When testing voltage exceeding 30V AC voltage RMS, 42V AC peak
or 60V DC, be particularly careful to avoid electric shock.
• When measuring, use correct jack, and select the proper function.
• Do not use the meter in explosive gas, vapor or dusty environ-
ments.
• When using the probe, fingers should be behind the probe protec-
tion device.
• Before measuring resistance, continuity, first turn off power and
discharge all high voltage capacitors.
• If the meter is not used in accordance with the instructions, the
meter’s safety protective function may become invalid.
• When opening the case (or part of the case), turn the meter off.
• When the battery low voltage indicator « » becomes lit, replace
the battery at once. A low battery will cause meter reading errors
and may result in electric shock or personal injury.
• Before opening the case or the battery cover, remove the test wires
from the meter.
• When maintaining the meter, use replacement parts specified by
the factory.
WARNING
Measure known voltage with the meter to verify that
the meter is working properly. If the meter is working
abnormally, stop using it immediately. A protective device
may be damaged. If there is any doubt, please have the
meter inspected by a qualified technician.

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ELECTRIC SYMBOLS
Important safety information. Read the manual.
High voltage with danger.
Ground
Double Insulation (Class II safety equipment).
Accord with the related EU laws and regulations
AC voltage
DC voltage
CONFORMS TO UL STD 61010-1, 61010-2-030
and 61010-2-033, CERTIFIED TO CSA STD
C22. 2 NO. 61010-1, 61010-2-030 and
61010-2-033

800.MACTOOLS 7
METER INSTRUCTIONS
Meter Appearance
1LCD display 5COM Input Terminal
2FUNC key 6VHz%Ω
Ω, kΩ, MΩ
AU TO
%
H z
V
A
Input Terminal
3HOLD key 7MAX/MIN key
4Rotary switch 8Backlight key
7
8
7
8
7
8
7
8

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Display
3
2
1
4
5 6
7
8
9
1011
KEYS OPERATION
FUNC Key
Press the key to switch functions. Switch AC/DC Voltage in “ ”
position, switch different range in “ A” and “ A” position.
Data Hold Key
Press the key to hold the current reading on the LCD display.
Press the key again to release the hold.
1Measuring indicator of FACOM current probe 720.P30 or 720.P1500
2Automatic measuring range indicator
3Direct voltage indicator
4Alternating voltage indicator
5Numerical value polarity indicator (negative sign)
6Measurement display value
7Measurement unit
8Auto power off indicator
9Battery low-voltage indicator
10 Data hold indicator
11 Continuity measurement indicator

800.MACTOOLS 9
MAX/MIN Key
Press the key to show the maxinum 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
minqum reading value among measuring data, press the button a third
time to return to normal mode.
Backlight Key
Press the key to turn on the backlight. Press the key again to manually
turn off the backlight.
Automatic Power-Off Function
In the measurement process, if there is no activity by the function key
or function selection switch for 15 minutes, the meter will automati-
cally shutdown (sleep state). Press “FUNC” key to power on and the
automatic shutdown function will be cancelled.
MAX/MIN Key
Move the rotary switch to the “Smart Funtion” position the default
mode is “AC Voltage”, “DC Voltage”, “Resistance” or “Continuity”,
connect the test leads cross the circuit or load to be measured.
It will be an Automatic judgement on the LCD display.
AC Voltage or DC Voltage, or Continuity or Resistance, are measured
simultaneously.
MEASURING OPERATION
WARNING
Don’t measure any RMS voltage higher than 600V DC or AC,
to prevent injury or damage to meterand equipment.

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AC/DC Voltage Measurement:
1. Rotate function selection switch to voltage measurement position.
2. Press “FUNC” key to select AC or DC voltage.
3. Connect the black test probe to the COM input jack and the red
probe to the V input jack.
4. Read the measured value from LCD display. When measuring DC
voltage, the display will simultaneously show the voltage polarity
which is connected with red test probe.
Resistance and Continuity measurement:
WARNING
When measuring resistance or circuit continuity, to avoid injury or meter
damage, turn off the power to the circuit and discharge all capacitors.
1. Rotate function selection switch to resistance measurement posi-
tion, and turn off the power to the circuit to be tested.
2. Connect the black test probe to the COM input jack and the red
probe to the Vinput jack.
3. Measure the resistance of circuit to be tested with other ends of
test probes.
4. Read the resistance value from LCD display. If it is overload, “OL”
will display on the LCD display.
5. If the measured circuit resistance is less than about 40Ω, the
buzzer will sound continuously.
Here are some tips for measuring resistance:
• The resistance measured on a circuit is usually different from the
rated value of resistance. This is because the test current of the
meter will flow through all possible channels between test probes.
• When measuring low resistance, to ensure accuracy, make a short
circuit between the test probes and read the resistance value of
the short circuit. This resistance value should be subtracted after
measuring the resistance to be tested.
• When there is no input (for example, open circuit), the display will
show “OL”, which means that the measured value is out of range.

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Clamp head measurement display (AC current)
1. Rotate function selection switch to the clamp head converter (AC
current) position.
2. Connect the black test probe to the COM input jack and the red
probe to the V input jack.
3. Select the different range of the clamp head converter to be AC30A
/ AC400 A / AC1500A. (for compatible FACOM clamps)
4. Press the «FUNC» key to select the corresponding measurement
range.
5. Reading the measured current value and the frequency value of the
clamp head converter from the LCD display.
Clamp head measurement display (DC current)
1. Rotate function selection switch to the clamp head converter
(DC current) position.
2. Connect the black test probe to the COM input jack and the red
probe to the V input jack.
3. Select the different range of the clamp head converter to be
DC30A / DC400 A / DC1500A. (for compatible FACOM clamps)
4. Press the FUNC key to select the corresponding measurement range.
5. Reading the measured current value of the clamp head converter
from the LCD display.

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GENERAL SPECIFICATIONS
• Operating environment and condition: 600V CAT lIl,
pollution grade: lI.
• Elevation < 2000 m.
• Environment temperature and humidity: 0~40°C, <80% RH
(do not use meter when temperature <0°C).
• Storage temperature and humidity: -10~60°C, <70% RH
(remove the battery).
• Temperature coefficient: 0.1xAccuracy/°C (<18°C or >28°C).
• The maximum allowable voltage between measurement end and
ground: 600V DC or 600V AC RMS.
• Sampling rate: about 3 times/s.
• Display: LCD display.
• Over-range indication: LCD will show “OL”.
• Low battery indication: When the battery voltage is lower than the
normal operating voltage, « » will display on the LCD display.
• Input polarity indication: automatically display «-» symbol.
• Power supply: AAA 1.5Vx2 batteries.
• Dimension(LxWxH): 150x74x48mm.
• Weight: about 230g.
Accuracy Indicators
Accuracy: ±(% of reading + digits) with one year of warranty.
Reference conditions: environmental temperature is from 18°C~28°C,
relative humidity is not more than 80%.

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DC Voltage
- Input impedance: 10MΩ.
- Overload protection: 600V DC or AC rms.
AC Voltage
- Input impedance: 10MΩ.
- Overload protection: 600V DC or AC (RMS).
- Frequency range: 45Hz~65Hz.
Resistance
Overload protection: 250V DC or AC (RMS).
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
2kΩ0.001kΩ
± (0.8% of reading + 3 digits)
20kΩ0.01kΩ
200kΩ0.1kΩ
2MΩ0.001MΩ
10MΩ0.01MΩ± (1.0% of reading + 5 digits)

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Continuity Measurement
- Open circuit voltage: approx. 0.4V.
- Overload protection: 250V DC or AC rms.
Frequency (Through grade HZ/DUTY)
- Overload protection: 600V AC RMS.
- The input voltage range: ≥2V (input voltage will increase when the
frequency to be measured increases).
AC Current (Clamp head converter)
- Input impedance: 10MΩ.
- Input signal: 30A (720.P30).
400A/1500A (720.P1500).
Function Measuring range Resolution Accuracy
When built-in buzzer
sounds, the resistance
to be tested is less
than 40Ω.
Open circuit voltage:
about 0.4V.
Range Resolution Accuracy
60Hz 0.1Hz
± (1.0% of reading + 5 digits)600Hz 1Hz
3kHz 10Hz
Measuring Range Resolution Accuracy
3A 1A/100mV
± (2.5% of reading + 8 digits30A 1A/100mV
400A 1A/0.1mV
1500A 1A/0.1mV ± (3.0% of reading + 10 digits
Ω, kΩ, MΩ
AUTO
%
H z
V
A

800.MACTOOLS 15
Duty Ratio
Through grade HZ/DUTY:
- Frequency response:40~3KHz.
- The input voltage range: ≥2V AC RMS (input voltage will in-
crease when the frequency to be measured increases).
- Maximum input voltage: 600V AC RMS.
Measuring Range Resolution Accuracy
10~90% 1% ±2%
MAINTENANCE
This section provides basic maintenance information, including
instructions for the battery. Do not try to repair the meter unless you
are an experienced maintenance person with the relevant calibration,
performance testing and maintenance data.
General Maintenance
WARNING
To avoid injury or damage to the meter, don’t wet the
inner parts of the meter. Before opening the case or
battery cover, remove the connecting cable between
the test probe and the input signal.
Regularly clean the meter case with damp cloth and a small amount of
detergent. Do not use abrasives or chemical solvents. If the input jack
becomes dirty or wet, it may affect the measurement readings.

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To clean input socket:
1. Turn off the meter and pull out all the test probes from the input
jack.
2. Remove all dirt from the jacks.
3. Apply detergent or lubricant to a new cotton ball.
4. Clean each jack with a cotton ball and lubricant to prevent contami-
nation by moisture in the socket.
Replacing The Batteries
WARNING
To avoid electric shock, make sure that the test leads have
been clearly move away from the circuit under measurement
before opening the battery cover of the meter.
WARNING
Do not mix old and new batteries. Do not mix alkaline, standard
(carbon-zinc), or rechargeable (ni-cad, ni-mh, etc) batteries.
If the sign « » appears, it means that the batteries should be
replaced.
Loosen the fixing screw of the battery cover and remove it.
Replace the exhausted batteries with new ones.
Put the battery cover back and fix it again to its origin form.
Note: Do not reverse the poles of the batteries.
Replace test leads
If insulation on leads is damaged, replace test leads.
WARNING
Use meet EN 61010-031 standard, rated CAT III 600V,
10A or better test leads.

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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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EM720T
Multímetro digital
Manual de instruccciones
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
20
ÍNDICE
Introducción 21
Instrucciones de seguridad 22
Hábitos de trabajo seguros 22
Símbolos eléctricos 24
Instrucciones del medidor 25
• Aspecto del medidor 25
• Pantalla 26
Funcionamiento de las teclas 26
• Tecla FUNC 26
• Tecla DATA HOLD 26
• Tecla MÁX./MÍN. 27
• Tecla de retroiluminación 27
• Función de apagado automático 27
Operación de medición 27
• Medición con la tecla de función SMART 27
• Medición de voltaje de CA/CC 28
• Medición de resistencia y continuidad 28
• Pantalla de medición del adaptador superior 29
de pinza amperimétrica (corriente de CA)
• Pantalla de medición del adaptador superior 29
de pinza amperimétrica (corriente de CC)
Especificaciones generales 30
• Indicadores de precisión 30
• Voltaje de CC 31
• Voltaje de CA 31
• Resistencia 31
• Medición de continuidad 32
• Frecuencia 32
• Corriente de CA 32
• Corriente de CC 32
• Régimen de trabajo 33
Mantenimiento 33
• Mantenimiento general 33
• Sustituir las pilas 34
• Sustituir los cables de prueba 34
Accessorios 35