Major tech MTD30 User manual

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MTD30
2000 COUNTS
DIGITAL MULTIMETER
OPERATION MANUAL
1. SAFETY INFORMATION
SAFETY SYMBOLS
Warning! Dangerous Voltage (Risk of electric shock).
Caution! Refer to the user’s manual before using this Meter.
Double Insulation (Protection Class Ⅱ).
Alternating Current (AC).
Direct Current (DC).
Either DC or AC.
Ground (maximum permitted voltage between terminal and ground).
The symbol indicates separate collection for electrical and electronic equipment.
The RESPONSIBLE BODY shall be made aware that, if the instrument
is used in a manner not specified by the manufacturer, the protection
provided by the instrument may be impaired.
The finger or any part of your body shall not be beyond the barrier of
the test probe when measuring.
Individual protective equipment must be used if HAZARDOUS LIVE parts in the
installation where measurement is to be carried out could be ACCESSIBLE.
The following safety information must be observed to insure maximum personal safety
during the operation at this meter.

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1.1 Do not operate the meter if the body of the meter or the test lead looks
broken.
1.2 Check the main function dial and make sure it is at the correct position
before each measurement.
1.3 When making current measurements ensure that the circuit is not “live”
before opening it in order to connect the test leads.
1.4 Do not perform resistance, diode and continuity test on a live power
system.
1.5 Do not apply voltage between the test terminals and test terminal to ground
that exceed the maximum limit record in this manual.
1.6 Exercise extreme caution when measuring live system with voltage greater than
60V DC or 30V AC.
1.7 Change the battery when the “” symbol appears to avoid incorrect data.
1.8 Use the DMM indoor, altitude up to 2000m and temperature 5
℃
to 40
℃
.
Maximum relative humidity 80% for temperatures up to 31
℃
, decreasing
linearly to 50% relative humidity at 40
℃
. Pollution Degree 2.
2. SPECIFICATIONS
2.1 GENERAL SPECIFICATIONS
Display: LCD with a max. reading of 1999.
Range control: Manual range control.
Polarity: Automatic negative polarity indication.
Zero adjustment: Automatic.
Over-range indication: The “1” or “-1” display.
Low-battery indication:Display " " sign.
Safety standards: EMC/LVD. CAT
Ⅱ
500V . CAT
Ⅲ
300V .
The meter is up to the standards of IEC1010 Double
Insulation, Pollution Degree 2, Overvoltage Category Ⅱ.
Operating Temperature 0°C to 40°C (32 to104°F),
environment: Humidity ≤80% RH.
Storage environment:Temperature -20°C to 60°C (-4 to140°F),
Humidity ≤90% RH.
Fuse:F 0.5A/600V 5 x 20mm.
Power supply:1.5V×2 “AAA” R03P battery.
Dimension: 118(H) x 65(W) x 30(D) mm
Weight: Approx. 100g (including battery).

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2.2 ELECTRICAL SPECIFICATIONS
Accuracies are ± ( % of reading + number in last digit )
at 23 ± 5°C ,≤75% RH.
2.2.1 DC Voltage
Range
Accuracy
Resolution
200mV
± ( 1.0%+2 )
0.1mV
2000mV
1mV
20V
10mV
200V
100mV
500V
± ( 1.2%+2 )
1V
Overload protection: 500V DC or AC rms
Impedance: 1MΩ
2.2.2 AC Voltage
Range
Accuracy
Resolution
200V
± ( 1.5%+3 )
100mV
500V
1V
Average sensing, calibrated to rms of sine wave
Frequency: 40～500Hz
Overload protection: 500V DC or AC rms
Impedance: 450kΩ
2.2.3 DC Current
Range
Accuracy
Resolution
2000μA
± ( 1.5%+2 )
1μA
20mA
10μA
200mA
± ( 2.0%+2 )
100μA
Overload protection: F0.5A/600V fuse
2.2.4 Resistance
Range
Accuracy
Resolution
200Ω
± ( 1.0%+5 )
0.1Ω
2000Ω
± ( 1.0%+3 )
1Ω
20kΩ
10Ω
200kΩ
100Ω
2000kΩ
± (1.5%+3 )
1kΩ
Overload protection: F0.5A/600V fuse

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2.2.5 Diode and Audible continuity test
Range
Description
Test condition
Display read
approximately
forward voltage
of diode
Forward DC current
approx. 10μA
Reversed DC voltage
approx. 1.8V
Built-in buzzer
sounds if
resistance is
less than 50Ω
Open circuit voltage
approx. 1.8V
Overload protection: F0.5A/600V fuse
2.2.6 Battery test
Range Accuracy Load current Resolution
1.5V
± ( 5.0%+5 )
50mA
10mV
9V
5mA
10mV
Overload protection: F0.5A/600V fuse
3. OPERATION
3.1 DC Voltage Measurement
1) Set the selector switch to desired “V” position.
2) Measure the voltage by touch the test lead tips to the test circuit where the
value of voltage is needed.
3) Read the result from the LCD panel. The polarity of the red lead connection will
be indicated along with the DC voltage value.
Note:
a) If the voltage range is not known beforehand, set the selector switch to high
range and work down.
b) When “1” or “-1” is display, over-range is being indicated and the selector switch
must be set to a higher range.
c) Don’t apply more than 500V DC or AC rms to the input, indication is possible at
higher voltage but there is danger of damaging the internal circuit.
d) Use extreme caution to avoid contact with high tension circuits when measuring
high voltage.
3.2 AC Voltage Measurement
1) Set the selector switch to desired “V” position.
2) Measure the voltage by touch the test lead tips to the test circuit where the
value of voltage is needed.

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3) Read the result from the LCD panel.
Note: See DC voltage measurement note a)～d).
3.3 DC Current Measurement
1) Set the selector switch to desired “mA ” position.
2) Remove power from the circuit under test and open the normal circuit path
where the measurement is to be taken. Connect the meter in series with
the circuit.
3) Read the result from the LCD panel. The polarity of the red lead connection will
be indicated along with the DC current value.
Note:
a) If the current range is not known beforehand, set the selector switch to high
range and work down.
b) When “1” or “-1” is display, over-range is being indicated and the selector switch
must be set to a higher range.
c) The maximum input current is 500mA, the 0.5A/600V fuse protect the current
measuring circuits.
3.4 Resistance Measurement
1) Set the selector switch to desired “Ω” position.
2) Connect tip of the test leads to the points where the value of the resistance
is needed.
3) Read the result from the LCD panel.
Note:
a) If the resistance value being measured exceeds the maximum value of the range
selected, an over-range indication will be displayed (“1”), select a higher range.
For resistance of approximately 1 megohm and above, the meter may take a few
seconds to stabilize, this is normal for high resistance readings.
b) When the input is not connected, i.e at open circuit, the sign “1” or “-1” will be
displayed for the over-range condition.
c) When checking in-circuit resistance, be sure the circuit under test has all power
removed and that all capacitors are fully discharged.
3.5 Diode Test
1) Set the selector switch to desired “ ” position.
2) Connect the test leads across the diode under measurement, display shows
the approx. forward voltage of this diode.

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Note:
Make sure the power is cut off and all capacitors need to be discharged under
this measurement.
3.6 Audible continuity Test
1) Set the selector switch to desired “ ” position.
2) Connect the test leads to two point of circuit, if the resistance is lower than
approx. 50Ω, the buzzer sounds.
Note:
Make sure the power is cut off and all capacitors need to be discharged under
this measurement.
3.7 Battery Test
1) Set the selector switch to desired “1.5V” or “9V” position.
2) Connect the probe across the source or load under measurement.
3) Read the result from the LCD panel.
4. Battery replacement
1) When the battery voltage drop below proper operation range, the “ ” symbol
will appear on the LCD display and the battery need to changed.
2) Before changing the battery, set the selector switch to “OFF” position to power
off.
3) Remove the screw on the battery cover and lift the battery cover.
4) Replace the old battery with the same type battery.
5) Close the battery cover and fasten the screws.
Caution:
Dispose the used batteries according to the rules, which are defined by each
community.
Warning:
If an explosion or fire hazard could occur through fitting a battery of the wrong
type.
5. Fuse replacement
1) This meter is provided with a F0.5A/600V fuse to protect the resistance, Diode,
Audible continuity, battery test and the current measuring circuits.
2) Ensure the meter is not connected to any external circuit, set the selector switch
to “OFF” position to power off.
3) Remove the screw on the battery cover to lift the battery cover, and remove the
two screws on the bottom case, loose the button stand upward side the battery

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box of the front case and lift the bottom case.
4) Replace the old fuse with the same type and rating:
5×20mm F0.5A/600V fuse.
5) Close the bottom case and the battery cover and fasten the screws.
6. MAINTENANCE
1) Before open the bottom case, never uses the meter before the bottom case
is closed.
2) To avoid contamination or static damage, do not touch the circuit board without
proper static protection.
3) If the meter is not going to be used for a long time, take out the battery and do
not store the meter in high temperature or high humidity environment.
4) Repairs or servicing not covered in this manual should only be conducted by
a qualified person.
5) Periodically wipe the case with a dry cloth and detergent. Do not use abrasives
or solvents on the meter.