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2202008000_31-M0420_00_01 130 × 185 mm
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M0420 | MD-420
GB Digital Multimeter
CZ Digitální multimetr
SK Digitálny multimeter
PL Multimetr cyfrowy
HU Digitális multiméter
SI Digitalni multimeter
RS|HR|BA|ME Digitalni multimetar
DE Digitales Multimeter
UA Цифровий мультиметр
RO Multimetru digital
LT Skaitmeninis multimetras
LV Digitālais multimetrs
EE Digitaalne multimeeter
BG Цифров мултиметър
2
GB | Digital Multimeter
Warning
Read this instruction manual thoroughly before you begin using
the MD-420. It contains highlighted passages detailing the safety
principles for using the device. Following these will prevent po-
tential injury by electric current or damaging of the device. The
multimeter was designed in accordance with standard IEC-61010
applying to electronic measuring devices within category CAT III
300 V, pollution degree 2. Category CAT III is intended for measur-
ing circuits through equipment powered by xed cabling, such
as relays, sockets, power strips, feeder lines and short branching
circuits and lighting systems in large buildings.
International Electrical Symbols
alternating current (AC)
direct current (DC)
alternating or direct current
earthing
double insulation
diode
fuse
°C unit
°F unit
hold maximum value
hold displayed value
continuity test
measurement using clamp (optional)
automatic range
battery low
warning
risk of injury by electric current
declaration of conformity (CE)
This symbol indicates a risk of injury by electric current.
This symbol means: warning, danger. Read every section of
the manual where this symbol is used!
WARNING
Above all, follow these instructions:
• Make sure the device is not damaged before you begin using
the multimeter. If you nd any damage, do not make any
measurements with the device! Make sure that the surface
of the multimeter is not scratched and that the side joints
are not coming apart.
• Do not measure voltages higher than 300 V or currents
higher than 10 A!
• The “COM” terminal must always be connected to the refer-
ence measuring earth.
• Check the measuring tips as well. Insulation on the measur-
ing probes should not have any visible signs of damage. If
the insulation is damaged, there is a risk of injury by electric
current. Therefore, do not use damaged measuring probes.
• Do not use the multimeter if you nd abnormal measure-
ment results. Such results may be caused by a damaged
fuse. If you are unsure of the cause of a defect, contact a
service centre.
• Do not use or store the multimeter in environments with
high temperature, dustiness or humidity. It is also not
recommended to use the device in environments where
strong magnetic elds may be present or where there is a
risk of explosion or re.
• Do not use the multimeter to measure higher voltages (and
currents) than stated on the front panel of the multimeter.
Otherwise, you risk injury by electric current and damage
to the multimeter!
• Before use, make sure the multimeter works correctly. Test
a circuit with known electrical quantities.
• Before you connect the multimeter to a circuit you intend to
measure, turn o the power supply to the circuit.
• If you need to replace a part of the multimeter (e.g. bat-
tery, fuse), always use spare parts of the same type and
specications. Replace parts only when the multimeter is
disconnected and switched o.
• Do not change or otherwise modify the internal circuits of
the multimeter!
1
2
3
1
300
3
EVERY
1
300
3
EVERY
3
• Be cautious when measuring voltages higher than 30 V AC
rms, 42 V peak or 60 V DC.
• Risk of injury by electric current!
• When using the measuring tips, make sure you hold them
behind the nger barriers.
• Disconnect the measuring tips from the tested circuit before
opening the multimeter’s casing.
• Do not make measurements if the casing of the multimeter
is removed or loose.
• Replace the battery once the screen shows a warning indica-
tor for low battery
• Otherwise, subsequent measurements may be inaccurate.
That may lead to false or distorted measurement results and
subsequent injury by electric current!
Warning
Use multimeter MD-420 only as specied below. Other uses
may result in damage to the device or your health. Follow these
instructions:
• Before you measure resistance, diodes or current, disconnect
circuits from power supply and discharge their high-voltage
capacitors.
• Before you make measurements, make sure the measuring
range switch is in the correct position. Do not under any
circumstances make changes to the measuring range during
measurement (by turning the circular measuring programme
switch). Doing so could damage the device.
• If you measure current, check the multimeter’s fuse and
turn o the power supply for the circuit before you connect
the multimeter.
• When making measurements, connect the black conductor
(probe) rst and the red conductor (probe) second. When
disconnecting the conductors, disconnect the red one rst.
Instructions for Multimeter Maintenance
Warning
Do not attempt to repair or in any way modify the multimeter if
you are not qualied for such an activity and if you do not have
the necessary calibration tools at your disposal.
To prevent injury by electric current, make sure that water does
not enter the interior of the multimeter!
• Disconnect the measuring tips from the tested circuit before
opening the multimeter’s casing.
• Regularly clean the body of the multimeter with a moist
cloth and a mild detergent. Clean only when the multimeter
is disconnected and switched o.
• Do not clean using solvents or abrasive agents!
• If you are not going to be using the multimeter for an ex-
tended period of time, turn it o and remove the batteries.
• Do not store the multimeter in a place with high humid-
ity or temperature or in an environment with a strong
magnetic eld!
Device Description
The multimeter belongs to a series of compact devices that have
a 3.5 digit screen and are designed for measuring DC and AC
voltage, direct current, resistance, capacity, temperature, test
diodes and perform audible tests of conductivity and circuits.
The multimeter is able to capture and hold the maximum meas-
ured value and the displayed value on the screen. It indicates
the exceeding of the measuring range. It also has an automatic
switch-o function.
The multimeter provides protection against overload and informs
the user when the battery is low. Ideal use of the multimeter is
e.g. in workshops, laboratories and households.
Frontal View of the Multimeter
(see Fig. 1)
1 – Screen
Displays 3.5 digits and can display a maximum value of 1999.
2 – Measuring Range Switch
The multimeter has an automatic range setting if you measure
voltage, current, resistance and capacity.
In automatic range mode, AUTO appears on the screen.
To select or end manual range mode:
a. Press the RANGE button. The multimeter switches to
manual mode and the AUTO symbol disappears from
the screen. Each subsequent press of the RANGE button
increases the range. After reaching maximum range, the
switch loops back to the lowest range.
b. To end manual mode, press and hold the RANGE but-
ton for 2 seconds. The multimeter will switch back to
automatic mode and the word AUTO will appear on
the screen.
3 – FUNC Button
When measuring current, you can use the FUNC button to switch
between AC and DC measurement.
When measuring temperature, the FUNC button switches be-
tween °C and °F units.
The FUNC button also switches between measuring diodes or
performing conductivity tests on circuits.
4 – On/O Switch
Pressing switches the device on or o.
5 – Range and Function Switch
The switch is used for selecting the desired function and range.
6 – “10 A” Socket
Plug in the head of the red (positive) tipped measuring conductor
to measure current in the 10 A AC/DC current range.
7 – “COM” Socket
Plug in the head of the black (negative) tipped measuring
conductor.
8 – “INPUT” Socket
Plug in the head of the red (positive) tipped measuring conduc-
tor to measure voltage, resistance, capacity or current to up
to 200 mA.
9 – Screen Backlight Button
Holding the button for 2 seconds illuminates the screen. Back-
lighting will turn o automatically after 15 seconds, or can be
switched o manually by again holding the button for 2 seconds.
10 – Button
Pressing the button will hold the measured value on the screen,
indicated by the symbol. Another press of the button
cancels the function and the symbol disappears.
11 – Button
Pressing the button will automatically hold the highest measured
value and the symbol will appear on the screen. Another
press of the button cancels the function and the symbol dis-
appears. In some ranges, the maximum value function is not
available.
Specications
Screen: LCD, 1999 (3.5 digits) with automatic polarity indication
Measurement method: double down-slope integral A/D
conversion
Reading speed: 2–3× per second
Operating temperature: 0 °C to 40 °C <75 %
Storage temperature: -10 °C to 50 °C, relative humidity <85 %
Temperature measurement range: -20 °C to 1 000 °C (-20 °C to
250 °C with the enclosed temperature probe)
Power supply: 3× 1.5 V AAA batteries
Fuses: F 250 mA/300 V, ø 5×20 mm, F 10 A/300 V, ø 5×20 mm
Low battery: indication by battery symbol on the screen
Indication of exceeded range: displays “OL” on the LCD
4
Measurement category: CAT III (300 V)
Enclosure: IP20
Dimensions 158 × 75 × 35 mm
Weight: 200 g (batteries included)
Accuracy
Accuracy is dened for the period of one year since calibration of
the device at 18 °C to 28 °C with relative humidity of up to 75 %.
Measurement accuracy is stated as: ± [(% of reading) + (least
signicant digit)].
Direct Voltage (DC)
Range Resolution Accuracy
200 mV 0.1 mV
+ (0.8 % + 5)
2 V 0.001 V
20 V 0.01 V
200 V 0.1 V
300 V 1 V + (1 % + 5)
Input impedance: 10 MΩ
Overload protection: 300 V DC/AC rms
Maximum input voltage: 300 V DC
Alternating Voltage (AC)
Range Resolution Accuracy
2 V 0.001 V
+ (1 % + 5)20 V 0.01 V
200 V 0.1 V
300 V 1 V + (1.2 % + 5)
Input impedance: 10 MΩ
Frequency range: 40 Hz to 400 Hz
Overload protection: 300 V DC/AC rms
Note: It is an average value corresponding to a calibrated eective
sine wave.
Max. input voltage: 300 V AC rms
Direct Current (DC)
Range Resolution Accuracy
200 µA 0.1 µA
+ (1.2 % + 5)
2 000 µA 1 µA
20 mA 0.01 mA
200 mA 0.1 mA
2 A 0.001 A + (2 % + 10)
10 A 0.01 A
Overload protection:
µA and mA range: F 250 mA L 300 V fuse
10 A range: F 10 A L 300 V fuse
Maximum input current:
INPUT socket max. 200 mA
10 A socket max. 10 A
(when measuring current higher than 2 A, do not measure for
longer than 15 seconds and further measurements can only be
repeated after 15 minutes)
Alternating Current (AC)
Range Resolution Accuracy
200 µA 0.1 µA
+ (1.5 % + 5)
2 000 µA 1 µA
20 mA 0.01 mA
200 mA 0.1 mA
2 A 0.001 A + (3 % + 10)
10 A 0.01 A
Overload protection:
µA and mA range: F 250 mA L 300 V fuse
10 A range: F 10 A L 300 V fuse
Maximum input current:
INPUT socket max. 200 mA
10 A socket max. 10 A
(when measuring current higher than 2 A, do not measure for
longer than 15 seconds and further measurements can only be
repeated after 15 minutes)
Frequency range: 40 Hz to 400 Hz
Note: It is an average value corresponding to a calibrated eective
sine wave.
Direct Current (Measurement Using a Clamp – Optional
Accessory to MD-420)
Range Resolution Accuracy
measurement 200 A 0.1 mV/0.1 A + (1.2 % + 5)
measurement 1 000 A 1 mV/1 A
Maximum input voltage: 200 mV DC
Alternating Current (Measurement Using a Clamp –
Optional Accessory to MD-420)
Range Resolution Accuracy
measurement 200 A 0.1 mV/0.1 A + (1.5 % + 5)
measurement 1 000 A 1 mV/1 A
Maximum input voltage: 200 mV AC
Frequency range: 40 Hz to 400 Hz
Note: It is an average value corresponding to a calibrated eective
sine wave.
Resistance
Range Resolution Accuracy
200 Ω 0.1 Ω + (1.2 % + 5)
2 kΩ 0.001 kΩ
+ (1 % + 5)20 kΩ 0.01 kΩ
200 kΩ 0.1 kΩ
2 MΩ 0.001 MΩ + (1.2 % + 5)
20 MΩ 0.01 MΩ + (1.5 % + 5)
Open-circuit voltage: 1 V
Overload protection: 300 V DC/AC rms
Temperature
Range Resolu-
tion Accuracy
-20 °C ~ 1 000 °C 1 °C
-20 °C ~ 0 °C: + (5 % + 4)
0 °C ~ 400 °C: + (1 % + 3)
400 °C ~ 1 000 °C: + (2 % + 3)
0 °F ~ 1 800 °F 1 °F
0 °F ~ 50 °F: + (5 % + 8)
50 °F ~ 750 °F: + (1 % + 6)
750 °F ~ 1 800 °F: + (2 % + 6)
Capacity
Range Resolution Accuracy
20 nF 0.01 nF + (8 % + 10)
200 nF 0.1 nF
+ (5 % + 5)
2 µF 0.001 µF
20 µF 0.01 µF
200 µF 0.1 µF
1,000 µF 1 µF + (8 % + 10)
Open-circuit voltage: 1 V
Transistor hFE Test
Range hFE Testing cur-
rent
Testing volt-
age
PNP and NPN 0 ~ 1 000 Ib ≈ 2 µA Vce ≈ 1 V
5
Diode Test and Circuit Continuity Test
Range Description Note
The screen will show the
approximate voltage of the
diode in the direction of
the current ow
No load voltage: 2.1 V
Built-in buzzer indicates
that the voltage of the
circuit is lower than 30 Ω
No load voltage: 2.1 V
Overload protection: 300 V DC/AC rms
For circuit continuity testing: When resistance is between 30 Ω
and 100 Ω, the buzzer may but does not have to sound.
When resistance is higher than 100 Ω, the buzzer will not sound.
Voltage Measurement
1. To measure voltage, plug the head of the black (negative)
tipped measuring conductor into the “COM” socket and the
head of the red (positive) conductor into the “INPUT” socket.
2. Turn the circular switch to set the type of measured voltage
to or . Select measurement in automatic range (AUTO
appears on the screen) or press the RANGE button to set the
multimeter to the expected voltage range.
3. When using the manual setting on a circuit with unknown
voltage, always set the highest possible range.
If “OL” appears on the screen when measuring in a manually
set range, you must switch to a higher range.
4. Connect the measuring tips to the measured voltage source.
The screen will show the measured voltage value. If the volt-
age is direct and the measuring tip is on the positive pole, a
positive voltage value will be indicated. Otherwise, a minus
sign will appear on the screen.
Note:
1. When the voltage range is low, the voltage value on the screen
may be unstable. In that case, the measuring tips were not
connected to a voltage source. This is a normal phenomenon
and does not aect measurement.
2. Never use the multimeter to measure voltages outside the 300 V
DC or 300 V AC range.
Immediately stop measuring if you exceed the 300 V range.
Otherwise, the multimeter may become damaged and you may
suer injury by electric current.
Current Measurement
1. To measure current, plug the head of the black (negative)
tipped measuring conductor into the “COM” socket and the
head of the red (positive) conductor into the “INPUT” socket
(for currents lower than 200 mA). If the measured current is
in the 200 mA to 10 A range, connect the red measuring
conductor to the “10 A” socket instead.
2. Turn the circular switch to set the measured current to
µA , mA or A .
3. When using the manual setting with an unknown current
value, always set the highest range, then gradually reduce it
until the corresponding current value is shown.
If “OL” appears on the screen, you must switch to a higher
range.
4. Use the FUNC button to switch between measuring direct
or alternating current.
5. Select measurement in automatic range (AUTO appears on
the screen) or press the RANGE button to set the multimeter
to the expected current range.
6. Connect the tipped measuring conductors serially to the
measured current in the circuit.
The screen will show the measured current value. If the cur-
rent is direct and the measuring tip is on the positive pole, a
positive current value will be indicated. Otherwise, a minus
sign will appear on the screen.
Never use the device to measure current in circuits where
the idle open-circuit voltage is higher than 300 V.
Measuring current at higher idle voltage may cause damage
to the device (fuse burnout, electric discharge) or injury by
electric current!
Always make sure you are using the correct measuring range
before you measure!
Current Measurement (Measuring Clamp DM634
– Optional Accessory to MD-420)
To measure direct current, you must use a DC measuring clamp.
To measure alternating current, you must use an AC measur-
ing clamp.
1. Plug the head of the black (negative) tipped measuring
conductor into the “COM” socket and the head of the red
(positive) conductor into the “INPUT” socket.
2. Switch to the range.
3. Use the FUNC button to switch between measuring direct
or alternating current.
4. Select measurement in automatic range (AUTO appears on
the screen) or use the RANGE button to set the multimeter
to the expected current range.
5. When using the manual setting with an unknown current
value, always set the highest range, then gradually reduce it
until the corresponding current value is shown.
If “OL” appears on the screen, you must switch to a higher
range!
6. Measurement is done by clamping the measured conductor
in the centre of the clamp.
You may only measure one conductor at a time.
The screen will show the measured current value. If the cur-
rent is direct and the measuring tip is on the positive pole, a
positive current value will be indicated. Otherwise, a minus
sign appears on the screen.
Note: Unifying deviation when measuring sensitivity
1. The sensitivity of measurement using the clamp is 0.1 A/0.1 mV.
If you are using a clamp with corresponding sensitivity, the
stated value is identical to the measured value.
2. When using a clamp which does not have a sensitivity of
0.1 A/0.1 mV, the values should be multiplied by a value based
on the clamp used so that the stated value corresponds to the
measured value.
Do not touch the measured circuit by hand or any other
body part.
Resistance Measurement
1. To measure resistance, plug the head of the black (negative)
tipped measuring conductor into the “COM” socket and the
head of the red (positive) conductor into the “INPUT” socket.
2. Switch to the Ω range for resistance measurement.
3. Choose automatic or manual measurement using the
RANGE button. If you are measuring in a range you set
manually and “OL” appears on the screen, you must switch
to a higher range.
4. Connect the measuring tips to the measured object (resis-
tor). The screen will show the measured resistance value.
Note:
1. When measuring resistances higher than 1 MΩ, it is necessary
to wait a few seconds before the measured value stabilises.
2. In an open circuit, the “OL” symbol will appear to indicate that
range has been exceeded.
Before measuring resistance, make sure the measured
object is disconnected from power supply and all capacitors
are fully discharged.