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2202018000_31-M3252_00_01 90 × 180 mm
M3252 | MD-510
GB Digital Multimeter
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GB | Digital Multimeter
Read this instruction manual thoroughly before you begin using the MD-510. 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 standard IEC-61010 which applies to electronic measuring devices within category
CAT III 600 V, pollution degree 2. 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-510 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 power
supply and discharge high-voltage capacitors. Use the corresponding function for
the given measurement. Before pressing the SELECT button to change functions,
disconnect the testing conductors from the tested circuit.
• Make sure the device is undamaged before you begin using the multimeter. If
you nd obvious signs of damage on the body of the device, do not perform 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 600 V! When making measurements, connect the
black conductor rst and the red conductor second. When disconnecting the testing
conductors, disconnect the red one rst.
• If you nd that the meter makes 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 listed on the front panel of the multimeter.
Risk of injury by electric current or damage to the multimeter!
• Check that the multimeter works properly before use. Test a circuit with known
electrical quantities.
• 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, dustiness
or humidity. It is also not recommended to use the device in environments with
potential strong magnetic elds or risk of explosion or re.
• When replacing parts of the multimeter (e.g. batteries), use spare parts of the same
type and specications. Change parts only when the multimeter is disconnected
and turned o. 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.
• Once the at battery icon " " appears on the screen, replace the battery. Otherwise,
subsequent measurements may be inaccurate. Incorrect measurements may then
result in injuries by electric current!
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. Ensure that water
does not enter the interior of 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 are not using the multimeter for an extended period of time, turn it o and
remove the batteries.
• Do not store the multimeter in places with high humidity and temperature or in
environments with strong magnetic elds!
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Replacing Batteries
When the " " symbol appears on the screen, it indicates the batteries are close to de-
pletion and must be immediately replaced. To replace the batteries, unfasten the screw
at the rear of the casing and remove the casing. Replace the batteries with new ones of
the same type (1.5 V button batteries, LR44 or equivalent) and make sure to observe the
correct polarity when inserting them. (+ side up). 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
Earthing
Double insulation
The product complies with the applicable EU standards
Device Description
The MD-510 is a compact, 3 5/6 digit, digital multimeter with automatic range for meas-
uring DC and AC voltage, resistance, frequency, capacity and continuity. It is also capable
of non-contact detection of AC voltage.
(see Fig. 1)
1 – Screen
2 – SELECT button – turns the device on/o, switches functions
3 – Testing probes
Technical Information
Screen: 3 5/6 digit LCD with maximum displayable value of 5999
Negative polarity indication: the screen automatically displays " - ".
Overload indication: the screen displays "OL".
Reading frequency: approximately 2 to 3× per second.
Power supply: 2× 1.5 V batteries, type LR44
Operating temperature: 0 °C to 40 °C, relative humidity < 75 %
Storage temperature: -10 °C to 50 °C, relative humidity < 85 %
Altitude: 0 to 2,000 meters
Dimensions: 112 × 54 × 12 mm
Weight: 70 g including packaging
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
6 V 0.001 V
± (0.8 % + 3)60 V 0.01 V
600 V 0.1 V
Input impedance: 10 MΩ
Maximum input current: 600 V DC
Note: When in Auto detection mode, a minimum input DC voltage of ≤ 1.2 V is required.
AC Voltage
Range Resolution Accuracy
6 V 0.001 V
± (1 % + 5)60 V 0.01 V
600 V 0.1 V
Input impedance: 10 MΩ
Frequency range: 40 Hz to 400 Hz
Maximum input current: 600 V AC
Response: average value, corresponding to a calibrated eective value of a sine wave.
Note: When in Auto detection mode, a minimum input AC voltage of ≤ 1.5 V is required.
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Resistance
Range Resolution Accuracy
600 Ω 0.1 Ω ± (2.0 % + 10)
6 kΩ 0.001 kΩ ± (1.2 % + 6)
60 kΩ 0.01 kΩ ± (1.0 % + 4)
600 kΩ 0.1 kΩ
6 MΩ 0.001 MΩ ± (2.0 % + 4)
10 MΩ 0.01 MΩ
Voltage of an open circuit: 0.7 V
Frequency
Range Resolution Accuracy
10 Hz 0.001 Hz
± (1.0 % + 4)
100 Hz 0.01 Hz
1 kHz 0.1 Hz
10 kHz 0.001 kHz
100 kHz 0.01 kHz
Input voltage: 1 V rms – 20 V ms
Measurement range: 1 Hz – 100 kHz
Capacity
Range Resolution Accuracy
40 nF 0.01 nF
± (4.0 % + 5)
400 nF 0.1 nF
4 μF 0.001 μF
40 μF 0.01 μF
100 μF 0.1 μF ± (5.0 % + 5)
Measurement range: 1 nF – 100 μF
Non-contact AC Voltage Detection
Measuring range: 50–600 V
Frequency response: 50 Hz/60 Hz
Continuity test
Range Description Note
If resistance is lower than 50 Ω, the built-
in buzzer will sound constantly and the
image on the screen will change from „_I
_“ to „_ _ _ _“.
If resistance is higher than 150 Ω, the
buzzer will not sound and the screen will
display „_I _“.
If resistance is between 50 Ω and 150 Ω,
the buzzer may or may not sound and
the image on the screen will change
depending on the buzzer‘s response.
Voltage of an
open circuit:
approx.
0.7 V
Operating Procedure
Instructions for the "SELECT" Button
Long-press the "SELECT" button for approximately three seconds to turn the device on.
The multimeter enters Auto Check mode. While in Auto Check mode, repeatedly press
the "SELECT" button to choose between functions: Auto Check mode (rst after turning
on the device) Continuity test Non-contact AC voltage detection AC voltage
measurement DC voltage measurement Resistance measurement Frequency
measurement Capacity measurement back to Auto Check mode.
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To turn o the multimeter, press and hold the "SELECT" button for approximately three
seconds.
Note: The multimeter goes through an initialisation process before starting non-contact
AC voltage detection. During this process, it will not respond to the pressing of the "SELECT"
button. If you want to switch functions, press the "SELECT" button only after the initialisation
process is complete (the screen will show " ", the buzzer will not sound).
Auto Check Mode
When in Auto Check mode, the multimeter automatically chooses between measuring DC
voltage, AC voltage or resistance based on the input coming in through the test probes.
1. With no output, the screen will show " Auto ---- ".
2. Without incoming voltage signal but with resistance under 10 MΩ, the screen will
display the resistance value.
3. With signal ≥ DC 1.2 V or AC 1.5 V, the screen will display the DC or AC voltage based
on the higher peak level.
4. Alarm upon overload: If the output is ≥610 V, the built-in buzzer will begin beeping
and the screen will show "OL".
Continuity Test
While in Auto Check mode, press the "SELECT" button once to switch to the continuity
test function.
Connect the test probes to the circuit you wish to test.
If resistance is higher than 150 Ω, the built-in buzzer will not sound and the screen will
display " ".
If resistance is lower than approx. 50 Ω, the buzzer will sound without interruption and
the screen will switch from " " to " ".
If resistance is between 50 Ω and 150 Ω, the buzzer may or may not sound and the image
on the screen will change depending on the buzzer's response.
Note: Before testing, disconnect all power supply from the circuit you wish to test and thor-
oughly discharge all capacitors.
Non-contact AC Voltage Detection
While in Auto Check mode, double press the "SELECT" button. The built-in buzzer will
beep and the centre of the screen will show four chart segments from right to left to
indicate the intensity of the electrical eld . Then, the segments will descend to
a lower level on the screen . The buzzer will now go quiet; the multimeter is in
non-contact detection mode.
Move the upper left corner of the multimeter closer to the object you are testing. When
the multimeter detects an electrical eld generated by AC voltage, it will indicate its
intensity as follows:
The intensity of the electrical eld is indicated by the number of chart segments located
in the centre of the screen and by the beeping of the built-in buzzer.
The higher the intensity of the detected electrical eld, the higher the number of seg-
ments that appear in the centre of the screen and the faster the beeping of the buzzer.
Note:
1. Detection range: 50–600 V, frequency response: 50 Hz/60 Hz.
2. The upper left corner of the meter (marked on the rear of the meter as "EF") is the
optimal location for non-contact measurement of AC voltage.
3. The meter's indication of the intensity of the electrical eld is aected by the AC
voltage range of the tested conductor, the distance of the multimeter from the
conductor, the insulation on the conductor and other factors.
4. Due to the detection limit of the multimeter, the tested conductor should be active
even if the meter does not indicate the presence of an electrical eld.
5. Test that the multimeter functions properly before use by detecting known AC
voltage.
6. Do not touch any conductors to avoid electric shock.
AC Voltage Measurement Function
While in Auto Check mode, press the "SELECT" button three times to switch to the AC
voltage measurement function. The screen will display the "~" symbol and the voltage
measurement unit.
Connect the test probes to the voltage source you wish to test.
The screen will show the measured value.
Note:
1. Measurement range: 0 to 600 V AC.
2. To prevent electric shock and damage to the device, do not connect the multimeter
to voltages higher than 600 V.