Duratool D03125 User manual

1
3½ DIGITAL MULTIMETER
MODEL: D03125

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IMPORTANT SAFETY INFORMATION
Please read these instructions carefully before use and retain for future
reference.
Important safety information. Read the instructions carefully.
High voltage. Danger.
Ground.
Double Insulation (Class II safety equipment).
Fuse must be replaced as per the specication herein.
!
200mA/250V
• When using electrical appliances basic safety precautions should always
be followed.
• The instrument can only be used in conjunction with the probe, for the
compliance with safety standards. If the probe needs replacing due
to damage, the replacement must be of the same type or of the same
electrical specications.
• Do not exceed the input limits specied for each range.
• When the instrument is measuring, do not touch the input terminal not in
use.
• When a measurement range is uncertain, turn the function/range switch to
the maximum range position.
• Before turning the function/range switch, make sure the probe is open with
the circuit being measured.
• Before on-line resistance measurement of voltage higher than 60V
DC/30V AC, remember to keep your ngers behind the hand shield of the
probe.
• When measuring a TV set or switch power supply, watch for pulse in the
circuit that may damage the multimeter.
• Before measuring any transistor, make sure the probe is not connected to
any circuit being measured.
• Before taking the measurement of voltage with the probe, make sure there
is no electronic element connected to the test socket of the transistor.
• One Instruction manual
• One pair of probes
• One package
• One 9V battery NEDA 1604 6F22
• One K Thermocouple sensor (MAS838 only)
• Rubber case (optional extra)
WHAT’S INCLUDED

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MAINTENANCE
• Before moving the rear cover, disconnect the probe from the circuit to be
measured.
• To protect the internal circuit, replace the fuse with one of the same
specication:
F1 250mA/250V
F2 10A/250V
• Do not use the instrument until the rear cover is put back in place and the
screws have been tightened.
• Clean the housing instrument with a wet cloth and a small amount of
detergent, if required.
• Do not use chemicals, abrasives or solvents that may damage the
instrument.
This 3½digital multimeter features stable, high reliable and anti-drop
performance. It is provided with an LCD display, 15mm in height, designed for
clear reading. The circuit design takes LSI double integral A/D converter as its
core under the protection of an overload protection circuit, making it a superior
and handy instrument. It can be used to measure DC and AC voltage, DC
current, resistance, diodes, transistors, temperature and in-circuit continuity.
MEASUREMENT FEATURES
Features IN07445 MAS830B IN07446 MAS838
Alternating Voltage
(V~)
ü ü ü ü
Direct Voltage (V ) ü ü ü ü
Direct Current (A ) ü ü ü ü
Resistance (Ω) ü ü ü ü
Diode ( ) ü ü ü ü
Temperature (°C) ü
On-Off ( ) ü ü ü
Data Hold ü ü ü ü
Backlight ü
FEATURES

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TECHNICAL INFORMATION
Accuracy ±% of reading ve digits, guaranteed for one year.
Ambient temperature: 18°C to 28°C.
Ambient humidity: 80%.
Maximum voltage between
input and the ground CATII 600V
Fuse F1 250mA/250V F2 10A/250V
Power 9V battery, NEDA 1604 or 6F22
Maximum display value 1999
Over-range indication “ 1 ”
Polarity display “ - ” for negative polarity
Operating temperature 0°C to 40°C
Storage temperature -10°C to 50°C
Low voltage indication “ + - ” on the display
Appearance dimension 138mm x 69mm x 31mm
Weight 170g
Direct Current Voltage Measurement
Range Resolution Accuracy
200mV 100μV ±0.5% of reading, ±3 digits
2V 1mV ±0.5% of reading, ±3 digits
Display
• 3½ digital, 15mm height, 7 sections LCD display.
Backlight
• Press the BACKLIGHT button to turn on the backlights, which will last for
five seconds. To turn it on again, press the button when required.
Function and Range Switch
• Select different functions and range.
VΩmA Jack
COM Jack
10A Jack
Data Hold button
• Press the HOLD button. The LCD will hold the last reading measured and
display the H symbol.
• When the button is released, the instrument will return to normal.

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• Overload protection: 200mV range: 250V DC or RMS;
• The rest ranges: 600V DC or RMS.
Direct Current Measurement
Range Resolution Accuracy
20μA 0.01μA ±1% of reading, ±3 digits
200μA 0.1μA ±1% of reading, ±3 digits
2mA 1μA ±1% of reading, ±3 digits
20mA 10μA ±1% of reading, ±5 digits
200mA 100μA ±1.5% of reading, ±5 digits
10A 10mA ±3% of reading, ±10 digits
• Overload protection: F1 200mA/250V Fuse F2 10A/250V
*MAS838, no 20μA position
Alternating Voltage Measurement
Range Resolution Accuracy
200V 100mV ±1.2% of reading, ±10 digits
600V 1V ±1.2% of reading, ±10 digits
• Overload protection: 600V DC or RMS
• Frequency range: 40Hz to 400Hz
• Display: Average (effective value of sinusoid)
Resistor
Range Resolution Accuracy
200Ω0.1Ω±0.8% of reading, ±5 digits
2kΩ1Ω±0.8% of reading, ±2 digits
20kΩ10Ω±0.8% of reading, ±2 digits
200kΩ100Ω±0.8% of reading, ±2 digits
2MΩ1kΩ±1.0% of reading, ±5 digits
• Maximum open circuit voltage: 3.2V
• Overload protection: 250V DC or RMS
20V 10mV ±0.5% of reading, ±3 digits
200V 100mV ±0.5% of reading, ±3 digits
600V 1V ±0.8% of reading, ±5 digits

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Notice
• If you do not know the measured voltage range in advance, set the
function/range switch to the maxium range and then gradually turn to
smaller ranges until you reach a satisfactory resolution.
• If the display shows “ 1 ”, this indicates an overrange measurement,
therefore the switch should be set to a higher range.
• Do not input a voltage of more than 600V. It is capable of indicating a
higher voltage, but with the risk of damaging the inside circuit.
• When taking the measurement of high voltage, pay special attention to
avoid an electric shock.
Direct Voltage Measurement
• Insert the red probe into the “VΩmA” jack and the black one into the COM
jack.
• Turn the function/range switch to the range of Vand connect the probe
to the power supply or load to be measured. The polarity touched by the
red probe will be on the display.
• Plug the instrument in and check the 9V battery. If it is low the “ ”
symbol will display, meaning the battery needs replacing.
• The besides the probe jack indicates that the input voltage or current
should not exceed the specied limits, in orderto protect the internal
circuit.
• Before measurement, turn the function/range switch to the desired range.
+ -
!
OPERATION
• Overload protection: 250V DC or RMS. AC.
Temperature Measurement
Range Resolution Measurement Accuracy
°C 1°C
-20°C to 0°C
-0°C to 400°C
400°C to 1000°C
±10% Range, ±2 digits
±1.0% Range, ±3 digits
±2.0% Range
Diode and Circuit On-Off Measurement
Range Description
When the on-resistance is smaller than (70±30)Ω, the
built-in buzzer will sound.
Displays the approximate diode postive voltage.

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Direct Current Measurement
• Place the black probe into the COM jack. For current, not exceeding
200mA, to be measured, put the red one into the “VΩmA” jack. For
current to be measured between 200mA and 10A, insert the red probe into
the 10A jack.
• Set the function/range switch to the desired Arange and connect the
probe in series with the load to be measured. The current value and the
polarity connected to the red probes will be shown on the display.
Note
• If you do not know the measured voltage range in advance, set the
function/range switch to the maximum range and then gradually turn to
smaller ranges until you reach a satisfactory resolution.
• If the display shows “ 1 ”, this indicates an overrange measurement,
therefore the switch should be set to a higher range.
• The symbol “ ” beside the probe indicates the maximum input current
is 200mA or 10A, depending on the inserted jack. Overcurrent will blow
the fuse.
Alternating Voltage Measurement
• Place the red probe into the “VΩmA” jack and the black one into the
“COM” jack.
• Turn the switch to V~ and connect the probe to the power supply or load
to be measured.
Resistance Measurement
• Place the black probe into the COM jack and the red one into the V/Ω/Hz
jack.
• Turn the switch to the COM jack and connect the probe to the resistor
being measured and read the results on the display.
Note
• If the resistor being measured is greater than the maximum value of
the selected range, the display will show “ 1 ”, requiring the selection of
a higher range. It normally takes a few seconds for the reading to get
stable when measuring a resistor larger than 1MΩ.
• In default of input for instance, open circuit, the display shows “ 1 ”.
• When measuring an online resistor, de-energize the circuit being
measured and discharge all capacitors.
Diode Measurement
• Insert the black probe into the COM socket and the red one into the
“VΩmA”, then the red probe will be of positive polarity.
• Turn the switch to the range and connect the red probe to the positive

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INFORMATION ON WASTE DISPOSAL FOR CONSUMERS OF
ELECTRICAL & ELECTRONIC EQUIPMENT.
When this product has reached the end of its life it must be treated
as Waste Electrical & Electronics Equipment (WEEE). Any WEEE
marked products must not be mixed with general household waste,
but kept separate for the treatment, recovery and recycling of the
materials used. Contact your local authority for details of recycling
schemes in your area.
Made in China. PR2 9PP
V.1.0
pole of the diode being measured and the black one to the negative pole.
Read the approximate forward voltage drop of the diode on the display.
Circuit On-Off Measurement
• Insert the black probe into the COM jack and the red one into the V.Ω.mA
jack.
• Turn the switch to the position and connect the probes in parallel with
two points of the circuit being measured. If the resistance between the
two points is less than 100Ω, the built-in buzzer will sound to indicate the
continuity between the two points.
Temperature Measurement
• Turn the switch to the °C position and insert the black probe of the
thermocouple sensor into the COM jack and the red into the V.Ω.mA jack.
• Place the operating terminals (temperature measurement terminals) onto
or inside the object being measured and directly read the temperature
value in °C on the display.
• When the switch is turned to the °C position and the sensor is in an open
circuit, the display shows room temperature.
Replacement of battery and fuse
• Under normal conditions it is unnecessary to replace the fuse.
• Do not replace it until the probes are unplugged and the power is shut
down. Take out the two screws of the rear cover to remove the housing.
• The specication of the fuse is:
- F1 250mA/250V, F210A/250V
(Any replacement should be of the same specication.)
• The battery for this multimeter is 9V NEDA 1604 or 6F22.
• Do not put the instrument into use until the rear cover is screwed after
replacing the battery or fuse.