ProsKit MT-1280 Manuel utilisateur
Digital Multimeter
MT-1280
User’s Manual
1
• SUMMARIZE
The meter is a stable multimeter with 25mm LCD display, driv-
en by battery. It’s widely used on measuring DCV, ACV, DCA,
ACA, resistance, capacitance, diode, transistor, continuity test
and temperature. It’s an ideal tool for lab, factory and family.
• SAFETY NOTE
The meter meets the standards of IEC1010. Read the opera-
tion manual carefully before operation.
1. Do not input limit over-ranged.
2. The voltage below 36V is safety. To avoid electric shock,
check whether the test leads are connected correctly,
whether the insulation is good when measuring over 36DCV
or 25ACV.
3. Remove the test leads when changing function and range.
4. To select correct function and range, beware of error
operation.
5. Do not operate the meter if battery case and back cover is
not xed.
6. Do not input voltage when measuring resistance.
7. Remove test leads from test point and turn off the power
before replacing battery and fuse.
8. SAFETY SYMBOLS
“”EXISTS DANGEROUS VOLTAGE,“ ”
GND,“”DUAL INSULATION
“”THE OPERATOR MUST REFER TO THE
MANUAL,“”LOW BATTERY
2
• CHARACTERISTIC
1. GENERAL
1-1. Displaying: LCD displaying.
1-2. Max. displaying: 1999(3 1/2digit) auto polarity indication.
1-3. Measuring method: dual slope A/D conversion.
1-4. Sampling rate: approx. 3 times/second.
1-5. Overrange indication: the MSD displays"1" or "-1".
1-6. Low battery indication:" " appears.
1-7. Operation environment: (0~40)˚C, R.H.<80% .
1-8. Power: 9V×1(NEDA1604/6F22 or equivalent model)
not included.
1-9. Size: 190×90×50mm
1-10. Weight: approx. 335g (Without Battery).
2. TECHNICAL CHARACTERISTIC
2-1. Accuracy: ±(a%×rdg+d) at (23±5)<R.H.<75%
2-2. TECHNICAL DATA
2-2-1. DCV
RANGE ACCURACY RESOLUTION
200mV
±(0.5%+3d)
100uV
2V 1mV
20V 10mV
200V 100mV
1000V ±(0.8%+10d) 1V
• Input resistance: 10MΩ for all ranges.
• Overload protection: 250V DV or AC peak value at 200mV range.
3
• 1000V DC or AC peak value at other ranges.
2-2-2. ACV
RANGE ACCURACY RESOLUTION
2V
±(0.8%+5d)
1mV
20V 10mV
200V 100mV
750V ±(1.2%+10d) 1V
• Input resistance: 10MΩ
• Overload protection: 1000V DC or AC peak value
• Frequency response: (40~200)Hz
• Display: sine wave RMS (mean value response)
2-2-3.DCA
RANGE ACCURACY RESOLUTION
200uA ±(0.8%+10d) 0.1uA
20mA 10uA
200mA ±(1.2%+8d) 100uA
20A ±(2.0%+5d) 10mA
• Max. input volt drop: 200mV
• Max. input current: 20A (the test time should be in 10
seconds)
• Overload protection: 0.2A/250V; 20A/250V fast-blown fuse
4
2-2-4.ACA
RANGE ACCURACY RESOLUTION
20mA ±(1.0%+15d) 10uA
200mA ±(2.0%+5d) 100uA
20A ±(3.0%+10d) 10mA
• Max. measuring volt drop: 200mV
• Max. input current: 20A (the test time should be in 10 seconds)
• Overload protection: 0.2A/250V; 20A/250V fast-blown fuse
• Frequency response: (40~200)Hz
• Display: sine wave RMS (mean value response)
2-2-5. RESISTANCE(Ω)
RANGE ACCURACY RESOLUTION
200Ω ±(0.8%+5d) 0.1Ω
2kΩ ±(0.8%+3d) 1Ω
20kΩ 10Ω
200kΩ 100Ω
20MΩ ±(1.0%+25d) 10kΩ
• Open voltage: less than 0.7V
• Overload protection: 250V DC and AC peak value
NOTE: at 200Ω range, the test leads should be short-circuit, and
measure the down-lead resistance, then, subtract from the real
measuring.
WARNING: DO NOT input any voltage at resistance
range for safety!
5
2-2-6. CAPACITANCE (C)
RANGE ACCURACY RESOLUTION
20nF ±(2.5%+20d) 10pF
2uF 1nF
200uF ±(5.0%+10d) 100nF
• Overload protection: 36V DC or AC peak value
2-2-7.TEMPERATURE(˚C)
Range Accuracy Resolution
(-20~1000)˚C < 400˚C±(1.0%+5d)
≥ 400˚C±(1.5%+15d)
1˚C
• Sensor: K-type thermocouple with banana plug
2-2-8.DIODE AND CONTINUITY TEST
Range Displaying value Test condition
Positive voltage drop
of diode
The positive DC current
is approx. 1mA, negative
voltage is approx. 3V
Buzzer sounds , the
resistance is less than
(70±20)Ω
open voltage is approx.
3V
• Overload protection: 250V DC or AC peak value
Warning: DO NOT input any voltage at this range for
safety!
6
2-2-9. Triode hFE test
Range Display range Test condition
hFE NPN or PNP 0~1000 Basic current is
approx.10uA,Vce
is approx.3V
4. OPERATION
4.1 Front panel description
1. Model
2. LCD display
3. Shine diode
4. range knob
5. 20A current jack
6."-" pole jack for capacitance,
temp. and test accessory and less
than 200mA current test jack.
7."+" pole jack for capacitance, temp.
test accessory and GND.
8. "+" pole jack for volt, resistance and diode.
9. Transistor test jack.
10. LCD backlight/Auto power off/on
4.2 DCV MEASUREMENT
1. Insert the black test lead to " COM " jack, the red one to V/Ω
jack.
2. Set the range knob to a proper DCV range, connect the test
leads across to the circuit under tested, the polarity and
voltage of the point which red lead connect will display on
1
2
10
3
4
5
6
9
8
7
7
LCD.
NOTE:
1. If the measured voltage is unsure beforehand, should set the
range knob to the highest range, then, switch to a proper range
according to the displayed value.
2. If LCD displays "1", it means overrange, should set the range
knob to a higher range.
4.3 ACV MEASUREMENT
1. Insert the black test lead to "COM " jack, the red one to V/Ω
jack.
2. Set the range knob to a proper ACV range, connect the test
leads across to the circuit under tested.
NOTE:
1. If the measured voltage is unsure beforehand, should set the
range knob to the highest range, then, switch to a proper range ac-
cording to the displayed value.
2. If LCD displays "1", it means overrange, should set the range
knob to a higher range.
4.4 DCA MEASUREMENT
1. Insert the black test lead to "COM " jack and the red one
to"mA" jack(max. 200mA) ,or insert the red one to "20A"
jack(max. 20A).
2. Set the range knob to a proper DCA range, connect the test
leads across to the circuit under tested, the current value
and polarity of the point which red lead connect will display
on LCD.
NOTE:
1. If the measured current is unsure beforehand, should set the
range knob to a higher range, then, switch to a proper range ac-
cording to the displayed value.
8
2. If LCD displays "1" , it means overrange, should set the range
knob to a higher range.
3. Max. input current is 200mA or 20A (subject to where red lead
insert), excessive current will blow the fuse. Be careful when
measuring. Continuously measuring large current may heat the
circuit, affect the accuracy, eve damage the meter.
4.5 ACV MEASUREMENT
1. Insert the black test lead to "COM" jack and the red one to
"mA" jack(max. 200mA), or insert the red one to "20A" jack
(max. 20A).
2. Set the range knob to a proper ACA range; connect the test
leads across to the circuit under tested.
NOTE:
1. If the measured current range is unsure beforehand, should set
the range knob to the highest range, then set to a proper range
according to the displayed value.
2. If LCD displays "1", it means overrange, should set the range
knob to a higher range.
3. Max. input current is 200mA or 20A (subject to where the red lead
insert to), excessive current will blow the fuse. Be careful when
measuring. Continuously measuring large current may heat the
circuit, affect the accuracy, even damage the meter.
4.6 RESISTANCE MEASUREMENT
1. Insert the black test lead to "COM" jack and the red one to
"V/Ω" jack.
2. Set the range knob to a proper resistance range, connect
the test leads across to the resistance under measured.
NOTE:
1. If the resistance value being measured exceeds the max value of
the range selected, LCD displays "1", thus, should set the range
9
knob to a higher range. When the resistance is over 1MΩ, the
meter may take a few seconds to stabilize. This is normal for high
resistance readings.
2. When input terminal is in open circuit, overload displays.
3. When measuring in-line resistance, be sure that power is off and
all capacitors are released completely.
4.7 CAPACITANCE MEASUREMENT
1. Insert the red test lead to "COM " terminal and the black one
to "mACx" jack.
2. Set the range knob to a proper capacitance range, connect
the test leads to the capacitor under measured (note: the
polarity of red test lead is"+").
NOTE:
1. If the capacitance range under measured is unsure beforehand,
should set the range knob to the highest range, then, set to a
proper range according to the displayed value.
2. If LCD displays "1" , it means overrange, should set the range
knob to a higher range.
3. Before measuring, LCD display might not be zero, the residual
reading will be decreased gradually and could be disregarded.
4. When measuring large capacitance, if creeps seriously or break
capacitance, LCD will display some instability value.
5. Discharge all capacitors completely before capacitance measure-
ment to avoid damage.
6. UNIT: 1uF =1000nF 1nF=1000pF
4.8 DIODE AND CONTINUITY TEST
1. Insert the black test lead to "COM" terminal and the red one
to V/Ω jack( Note: the polarity of red test lead is"+").
2. Set the range knob to " " range, connect the test leads
to the diode under measured,
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1
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