99 Washington Street Melrose, MA 02176
Phone 781-665-1400 Toll Free 1-800-517-8431
MT-1280
3 1/2 Digital Multimeter
User’s Manual
st
1
Edition, 2013
©2013 Copyright by Prokit’s Industries Co., Ltd.
SUMMAR
The meter is a stable multimeter with 26mm LCD display,
driven by battery. It’s widely used on measuring DCV, ACV,
DCA, ACA, resistance, capacitance, diode, transistor,
continuity test and temperature. Ideal for lab, factory and
family use.
SAFETY NOTE
The meter meets the standards of IEC1010. Read the
operation manual carefully before operation.
1. Do not input limit over-ranged.
2. The voltage below 36V is safety. To avoid electric shock,
3. Remove the test leads when changing function and
4. To select correct function and range, beware of error
5. Do not operate the meter if battery case and back cover is
6. Do not input voltage when measuring resistance.
7. Remove test leads from test point and turn off the power
8. SAFETY SYMBOLS
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 LCD displays"1" or "-1".
1-6. Low battery indication:"
1-7. Operation environment: (0~40)˚C, R.H.<80% .
IZE
check whether the test leads are connected correctly,
whether the insulation is good when measuring over
36DCV or 25ACV.
range.
operation.
not fixed.
before replacing battery and fuse.
“
” indispensably refer to the manual， “ ” GND ,
“ ＂ Double Insulation, “ ” low battery。
" appears.
1
1-8. Power: 9V×1(NEDA1604/6F22 or equivalent model)
not included.
1-9. Size: 182×90×46mm
1-10. Weight: approx. 320g (Without Battery).
2. TECHNICAL CHARACTERISTIC
2-1. Accuracy: ±(a%×rdg+d) at (23±5°C)<R.H.<75%
2-2. TECHNICAL DATA
2-2-1. DCV
RANGE ACCURACY RESOLUTION
200mV 100uV
2V 1mV
20V 10mV
200V
1000V ±(0.8%+10d) 1V
• Input resistance: 10MΩ for all ranges.
• Overload protection: 250V DV or AC peak value at 200mV
range.
• 1000V DC or AC peak value at other ranges.
2-2-2. ACV
RANGE ACCURACY RESOLUTION
2V 1mV
20V 10mV
200V
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 0.1uA
20mA
2
±(0.5%+3d)
±(0.8%+5d)
±(0.8%+10d)
100mV
100mV
10uA
200mA ±(1.2%+8
20A ±(2.0%+5d) 10mA
• Max. input volt drop: 200mV
• Max. input current: 20A (the test time should be in 10
seconds)
• 0.2A/250V Self-resettable fuse; 20A/250V fast-blown fuse
2-2-4.ACA
RANGE ACCURACY RESOLUTION
20mA ±(1.0%+5d) 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)
• 0.2A/250V Self-resettable fuse ; 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 1Ω
20kΩ 10Ω
200kΩ
20MΩ ±(1.0%+25d) 10kΩ
200MΩ ±(5.0%+10d) 100kΩ
• 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!
2-2-6. CAPACITANCE (C)
3
±(0.8%+3d)
d) 100uA
100Ω
RANGE ACCURACY RESOLUT
20nF 10pF
20uF
200uF
• Overload protection: 36V DC or AC peak value
WARNING: DO NOT input any voltage at this range for
safety!
2-2-7.TEMPERATURE(˚C)
RANGE ACCURACY RESOLUTION
(-20~1000)˚C < 400˚C±(1.0%+5d)
• Sensor: K-type thermocouple with banana plug
WARNING: DO NOT input any voltage at this range for
safety!
2-2-8.DIODE AND CONTINUITY TEST
Range Displaying value Test condition
Positive voltage
drop of diode
Buzzer sounds , the
resistance is less
than (70±20)Ω
• Overload protection: 250V DC or AC peak value
2-2-9. Triode hFE test
Range Displaying value Test condition
hFE NPN or PNP 0~1000 Basic current is
WARNING: DO NOT input any voltage at this range for
safety!
4
±(2.5%+20d)
±(5.0%+20d)
>100uF (only for
reference)
≥ 400˚C±(1.5%+15d)
The positive DC current
is approx. 1mA, negative
voltage is approx. 3V
open voltage is approx.
3V
10nF
100nF
1˚C
approx.10uA,Vce
is approx.3V
ION
OPERA
3.1 Front panel description
1. Model
2.
3. Back light switch
4. Power switch
5. Range knob
6. 20A current jack
7. Less than 200mA current,
8. COM: capacitance,
9. V
10. Hold switch
11. LED indicator light
3.2 DCV MEASUREMENT
1. Insert the black test lead to " COM " jack, the red one to
2. Set the range knob to a proper DCV range, connect the
NOTE:
1. If the measured voltage is unsure beforehand, should set
2. If LCD displays "1", it means overrange, should set the
3.3 ACV MEASUREMENT
1. Insert the black test lead to "COM " jack, the red one to
2. Set the range knob to a proper ACV range, connect the
5
TION
LCD display
Capacitance ,Temperature
“+”, HFE jack
temperature“-”, hFE test
accessory, diode,
continuity jack
olt, resistance, diode and continuity jack
V/Ω jack.
test leads across to the circuit under tested, the polarity
and voltage of the point which red lead connect will
display on LCD.
the range knob to the highest range, then, switch to a
proper range according to the displayed value.
range knob to a higher range.
V/Ω jack.
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