ProsKit MT-1280 Bedienungsanleitung
MT-1280
3 1/2 Digital Multimeter
User’s Manual
1st Edition,2013
©2013 Copyright by Prokit’s Industries Co., Ltd.
SUMMARIZE
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,
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 fixed.
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
“” indispensably refer to the manual，“ ” GND ,
“ ＂ Double Insulation, “ ” low battery。
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:" " appears.
1-7. Operation environment: (0~40)˚C, R.H.<80% .
1
2
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
±(0.5%+3d)
100mV
1000V ±(0.8%+10d) 1V
• Input resistance: 10MΩfor 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
±(0.8%+5d)
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 0.1uA
20mA ±(0.8%+10d) 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)
• 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
2kΩ1Ω
20kΩ10Ω
200kΩ
±(0.8%+3d)
100Ω
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 200Ωrange, 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
RANGE ACCURACY RESOLUTION
20nF 10pF
20uF ±(2.5%+20d) 10nF
200uF
±(5.0%+20d)
>100uF (only for
reference)
100nF
• 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)
≥400˚C±(1.5%+15d)
1˚C
• 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
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
2-2-9. Triode hFE test
Range Displaying value Test condition
hFE NPN or PNP 0~1000 Basic current is
approx.10uA,Vce
is approx.3V
WARNING: DO NOT input any voltage at this range for
safety!
4
OPERATION
3.1 Front panel description
1. Model
2. LCD display
3. Back light switch
4. Power switch
5. Range knob
6. 20A current jack
7. Less than 200mA current,
Capacitance ,Temperature
“+”, HFE jack
8. COM: capacitance,
temperature“-”, hFE test
accessory, diode,
continuity jack
9. Volt, resistance, diode and continuity jack
10. Hold switch
11. LED indicator light
3.2 DCV MEASUREMENT
1. Insert the black test lead to " COM " jack, the red one to
V/Ωjack.
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 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.
3.3 ACV MEASUREMENT
1. Insert the black test lead to "COM " jack, the red one to
V/Ωjack.
5
2. Set the range knob to a proper ACV range, connect the
6
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 according to the displayed value.
2. If LCD displays "1", it means overrange, should set the
range knob to a higher range.
3.4 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 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 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.
3.5 ACA 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
7
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.
3.6 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 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.
3.7 CAPACITANCE MEASUREMENT
1. Insert the red test lead to " mA" terminal and the black one
to " COM " 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
measurement to avoid damage.
6. UNIT: 1uF =1000nF 1nF=1000pF
3.8 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, reading is the
approximation of the diode positive volt drop.
3. Connect the test leads to two points of the measured
circuit, if buzzer sounds, the resistance is lower than
approx. (70±20)Ω.
3.9 TEMPERATURE MEASUREMENT
Insert the cathode of thermocouple’s cold end to " COM" jack
and anode to " mA" terminal, put the working end on or in the
tested object, temperature value can be read on LCD in
Celsius.
3.10 TRIODE hFE
1. Set the range knob to hFE.
2. Insert the test accessory into “COM” and “mA” terminal.
3. Verify the type of the transistor is NPN or PNP, insert the
emitter, basic and collector to the proper jack on test
accessory.
3.11 AUTO POWER OFF
8
Stop working around 15 minutes, the instrument will auto off
and get into the sleeping mode. To restart the meter, press
“power” button twice for back to working status.
MAINTENANCE
It’s a precision meter, DO NOT try to verify the circuit
1. Beware of waterproof, dustproof and shockproof.
2. Do not operate and store the meter in the circumstance of
high temperature, high humidity, and flammability,
explosive and strong magnetic field.
3. Use the damp cloth and soft solvent to clean the meter, do
not use abrasive and alcohol.
4. If do not operate it for a long time, should take out the
battery.
4-1. When LCD displays " " symbol, should replace the
battery as below:
4-1-1. Remove the battery compartment screws and pull
out the battery compartment.
4-1-2. Take out the battery and replace a new one. It’s
better to use alkalescency battery for long time
use.
4-1-3. Fix the battery case
If the meter does not work properly, check
the meter as following:
CONDITIONS WAY TO SOLVE
NO DISPLAYING Power is off
Replace battery
SYMBOL DISPLAYS Replace battery
NO CURRENT INPUT Replace fuse
VALUE ERROR Replace battery
9
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