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2202017000_31-M3620_00_01 105 × 148 mm
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M3620 | MD-310
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
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GB | Digital Multimeter
Carefully read through this instruction manual before you begin using the MD-310. It contains particularly
important passages concerning occupational safety principles when using the device. Such passages
are highlighted. Reading the manual will prevent potential injury by electric current or damage to the
device. The multimeter was designed in accordance with the IEC-61010 standard regarding electronic
measuring devices in the category (CAT III 300 V), 2nd degree of pollution. The CAT III category is used to
measure circuits powered by a xed output power supply, such as a relay, socket, switchboards, power
supplies, short branching circuits and lighting systems in large buildings.
Warning
Use the MD-310 multimeter only in the manner specied below. Other uses may cause damage to the
device or injury to your health. Comply with the following instructions:
• Before measuring resistance, diodes or current, disconnect the circuits from the power supply and
discharge the high-voltage capacitors. Use the corresponding function for the given measurement.
Before changing the range (or switching functions) disconnect the conductor from the circuit that
is being measured.
• Make sure the device is not damaged before you begin using the multimeter. If you nd obvious
signs of damage on the body of the device, do not make any measurements! Check that the surface
of the multimeter does not have scratches and that the side joints are not coming apart.
• Also check the insulation on the measuring probes. Damaged insulation may result in injury by
electric current. Do not use damaged measuring probes!
• Do not measure voltages above 300 V! If you intend to measure current, check the multimeter's fuse
and turn o the power supply to the circuit before you connect the multimeter. Before measuring,
make sure the circular switch for the measuring range is in the correct position. Under no circum-
stances should you make any changes to the measuring range (by moving the circular switch for
measuring programs) while measuring! It could damage the device. When you are measuring, rst
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connect the black conductor (probe) and then the red conductor (probe). When disconnecting the
testing conductors, disconnect the red one rst.
• If you nd that the multimeter is making abnormal measurements, stop using it. The fuse may be
damaged. If you are unsure of the cause of the defect, contact a service centre.
• Do not measure voltages higher than indicated on the front panel of the multimeter. Risk of injury
by electric current or damage to the multimeter!
• Check that the multimeter is working properly before use. Test on a circuit with electrical values
you know.
• Before you connect the multimeter to a circuit you intend to measure, turn o the power to the circuit.
• Do not use or store the multimeter in environments with high temperature, dust or humidity. It is
also not recommended to use the device in environments with potentially strong magnetic elds
or risk of explosion or re.
• When changing parts of the multimeter (e.g. the battery or fuse) use spare parts of the same type
and specications. Change parts only when the multimeter is disconnected and turned o. Do not
change the 10 A/300 V fuse by yourself; please contact a service centre. Disconnect the testing
conductors from the tested circuit before opening the rear casing of the device.
• Do not alter or otherwise interfere with the internal circuitry of the multimeter!
• Be extra careful when measuring voltages higher than 30 V AC rms, 42 V peak or 60 V DC. Risk of
injury by electric current!
• When using measuring tips, make sure you are holding them behind the nger barriers.
• Do not perform measurements if the multimeter's casing is removed or loose.
• Change the batteries when an icon of a discharged battery appears " " on the screen. Otherwise,
subsequent measurements may be inaccurate. Incorrect measurements may then result in injuries
by electric current! Use alkaline batteries only; do not use re-chargeable batteries.
Maintenance Instructions
Warning
Do not attempt to repair or modify the multimeter in any way if you are not qualied to do so or do
not have access to the necessary calibration equipment. Make sure that water does not get into the
multimeter – you could prevent injury by electric current!
• Disconnect the measuring tips from the tested circuit before opening the casing of the multimeter.
• Regularly clean the body of the multimeter with a moist cloth and a mild detergent. Perform cleaning
only when the multimeter is disconnected and turned o.
• Do not use solvents or abrasive agents for cleaning!
• If you won't be using the multimeter for a longer period of time, turn it o and remove the battery.
• Do not store the multimeter in places with high humidity and temperature or in environments
with strong magnetic elds!
Changing Batteries
When the " " symbol appears on the screen, it means the battery is low and must be immediately
changed. To replace the batteries, unfasten the screw at the rear of the casing and remove the casing.
Replace the drained battery with a new one of the same type (9 V, 6F22 type or equivalent) and make
sure to insert it with the correct polarity. Replace the rear casing.
Electrical Symbols
Alternating current (AC)
Direct current (DC)
Warning symbol, hazard. Pay particular attention to sections of the manual marked with this symbol.
Risk of injury by electric current
Fuse
Earthing
Double insulation
The product complies with the applicable EU standards
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Device Description
The MD-310 is a compact, 3 ½ digit, digital multimeter with automatic range for measuring DC and AC
voltage, DC current, resistance and continuity and for testing diodes.
(see Fig. 1)
1 – Screen
2 – button – DATA HOLD function
3 – Circular switch for changing measuring range/choosing the desired function.
4 – "10 A" socket – for the plug at the end of the red (positive) tipped measuring conductor for measuring
currents in the 10 A DC current range.
5 – "COM" socket – for the plug at the end of the red (positive) tipped measuring conductor.
6 – "VΩmA" socket – for the plug at the end of the red (positive) tipped measuring conductor for meas-
uring voltage, resistance, diodes, continuity and current up to 200 mA.
7 – " " button – for activating screen illumination
Technical Information
Screen: 3 ½ digit LCD with a maximum displayable value of 1999
Negative polarity indication: the screen automatically displays " - ".
Overload indication: the screen displays "OL".
Reading frequency: approximately 2× to 3× per second.
Power supply: 1× 9 V battery, type 6F22 or equivalent
Operating temperature: 0 °C to 50 °C, relative humidity < 75 %
Storage temperature: -10 °C to 60 °C, relative humidity < 85 %
Altitude: 0 to 2 000 meters
Dimensions: 150 × 78 × 37 mm
Weight: 210 g including battery
Measurement Accuracy
Accuracy is specied for the duration of one year after calibration and only at temperatures between
18 °C and 28 °C and air humidity up to 75 %.
Accuracy specications are:
± [(% of reading) + (lowest valid digits)]
DC Voltage
Range Resolution Accuracy
200 mV 100 µV ± (0.5 % + 5)
2 V 1 mV
± (0.8 % + 5)20 V 10 mV
200 V 100 mV
300 V 1 V ± (1 % + 5)
Input impedance: 1 MΩ
Maximum input voltage: 300 V DC
AC Voltage
Range Resolution Accuracy
200 V 100 mV ± (1.2 % + 5)
300 V 1 V
Frequency range: 40 Hz to 400 Hz
Maximum input voltage: 300 V AC
Response: average value, corresponding to a calibrated eective value of a sine wave.
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Direct current (DC)
Range Resolution Accuracy
20 mA 10 µA ± (1 % + 5)
200 mA 100 µA ± (1.2 % + 5)
10 A 10 mA ± (2 % + 5)
Protection against overload:
μA and mA range: fuse 250 mA/300 V, type F, Ø 5 × 20 mm.
10 A range: fuse 10 A/300 V, type F, Ø 5 × 20 mm.
Maximum input current: "VΩmA" socket max. 200 mA; "10 A" socket max 10 A
(when measuring currents larger than 2 A; the measurement duration must be max. 10 seconds and
measurement may be repeated again only after 15 minutes)
Resistance
Range Resolution Accuracy
200 Ω 0.1 Ω ± (1.2 % + 5)
2 kΩ 1 Ω
± (1.0 % + 5)20 kΩ 10 Ω
200 kΩ 100 Ω
2 MΩ 1 kΩ ± (1.2 % + 5)
Voltage of an open circuit: 3 V
Battery Test
Range Resolution Electrical load
1.5 V 0.01 V approximately 20 mA
9 V 0.01 V approximately 5 mA
12 V 0.01 V approximately 4 mA
Continuity Test
Symbol Description Note
The built-in buzzer will ring constantly if
resistance is lower than 20 Ω.
The buzzer will be quiet if resistance is
higher than 100 Ω.
If resistance is between 20 Ω and 100 Ω;
the buzzer may or may not ring.
Voltage of an open circuit: approximately
3 V
Diode Test
Symbol Description Note
The approximate voltage of the diode
in the direction of the current ow will
appear on the screen
Voltage of an open circuit: approximately 3 V
Load current: approximately 1 mA