Prokit's Industries MT-1270 User Manual

MT-1270
3 1/2 Digital Multimeter

User’s Manual

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Edition, 2013

©2013 Copyright by Prokit’s Industries Co., Ltd.

Genera

l

This instrument is a high performance and accuracy digital
multimeter driven by 9V battery. It uses the LCD with 26mm high
figure to make the reading clear and the operation more
convenient.
This instrument can measure DC and AC Voltage, DC and AC
Current, Resistance, Capacitance, Frequency, Diode, Transistor,
Continuity, Temperature, etc. It is an excellent instrument with the
dual-integral A/D converter as core, mostly suitable for lab, factory,
maintenance and repair users.
Safety Note
This instrument meets the standard of IEC1010 (safety standard
promulgated by International Electrician Committee), please read
the safety notes carefully before operation.
1． Do not input the value over the range limit when measuring

each range.

2． The safety voltage is below 36V, please make sure the test

leads connect reliably, link up correctly, isolate properly to
avoid electric shock when measuring the voltage higher than
36V DC or 25V AC.

3． Please make sure the test leads off the tested point when

converting the function and range.

4． Please select the correct function and range to avoid the fault

operation. Even through the instrument has full protection
function; please pay high attention when measuring for safety.

5． Do not operate the instrument before the battery is fixed on

properly and battery compartment is screwed tightly.

6． Do not input the voltage when measuring the resistance.
7． Please make sure the test leads off the tested point and the

power is turned off before replacing the battery or fuse.

Safety Note Description:

” indispensably refer to the manual， “ ” GND ,

“
“ ” Double Insulation, “ ” low battery。

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Property
1． General Properly

1-1. Display: LCD
1-2. Max display: 1999 (3 1/2 digit) automatic polarity display.
1-3. Measuring method: dual-integral A/D converter
1-4. Sampling Rage: approx. 3 times / sec.
1-5. Overrange display: LCD displays “1” or “-1”
1-6. Low battery display: “
1-7. Operation environment: （0～40）℃,Relative humidity: <80%
1-8. Power: a 9V battery (NEDA1604/6F22 or equivalent)
1-9. Dimension: 182 x 90 x 46 mm
1-10. Weight: approx. 320g (Not including 9V battery)
1-11. Accessory: user manual, CAT III test leads, temperature

Technical Property

2-1．Accuracy: ±(a% x reading + digits) at (23±5)℃, relative

2-2．Functions: DC and AC Voltage, DC and AC Current,

2-3-1.(DCV)

Input Impedance: 10 MΩ at all the ranges.
Overload protection: 250V DC or AC peak value at Range
200mV, 1000V DC or AC peak value at other Ranges.

”symbol appearance

probe, test socket

humidity <75%, one year calibration guarantee since the time
dispatched form the manufactory.

Resistance, Capacitance, Frequency, Diode, Transistor,
Continuity, Temperature, Backlight, Auto power off, Overload
protection, Low battery indication

Range Accuracy Resolution
200mV 100uV
2V 1mV
20V 10mV
200V
1000V ±(0.8%+10d) 1V

±(0.5%+3d)

100mV

2

2-3-2.(ACV)

Range Accuracy Resolution

2V 1mV

20V 10mV
200V
750V ±(1.2%+10d) 1V

Input Impedance: 10 MΩ at all the ranges.
Overload protection: 1000V DC or AC peak value.
Frequency Response: （40~200）Hz at the Range below 20V

（40~100）Hz at the Range 200V~750V

Display: average value response (RMS of sine wave)

2-3-3.（DCA）

Range Accuracy Resolution

2mA 1uA

20mA
200mA ±(1.2%+8d) 100uA

10A ±(2.0%+5d) 10mA
Max input voltage drop: 200mV
Max input current: 10A (less than 10 seconds)
Overload protection: 0.2A/250V self-resettable fuse, 10A/250V
fast-blown fuse

2-3-4.（ACA）

Range Accuracy Resolution

20mA ±(1.0%+15d) 10uA

200mA ±(2.0%+5d) 100uA

10A ±(3.0%+10d) 10mA
Max measurement voltage drop: 200mV
Max input current: 10A (less than 10 seconds)
Overload protection: 0.2A/250V self-resettable fuse, 10A/250V

±(0.8%+5d)

100mV

±(0.8%+10d)

10uA

3

fast-blo

wn fuse
Frequency response: (40~200)Hz
Display: average value response (RMS of sine wave)

2-3-5.（Ω）

Range Accuracy Resolution
200Ω ±(0.8%+5d) 0.1Ω
2kΩ 1Ω
20kΩ 10Ω
200kΩ 100Ω
2MΩ
20MΩ ±(1.0%+25d) 10kΩ

200MΩ ±(5.0%+30d) 100kΩ
Open circuit voltage: less than 0.7V
Overload protection: 250V DC and AC peak value.
Note: At Range 200Ω, short-circuit the test lead to test the wire
resistance, and then subtract it from the real measurement.

WARNING: DO NOT input any voltage at resistance

range for safety!

2-3-6.(C)

Range Accuracy Resolution

2nF ±(2.5%+20d) 1pF

20nF ±(2.5%+20d) 10pF

200nF ±(2.5%+20d) 100pF

2uF ±(2.5%+20d) 1nF

20uF ±(5.0%+10d) 10nF

• Overload protection: 36V DC or AC peak value

WARNING: DO NOT input any voltage at this range for

safety!

±(0.8%+3d)

1kΩ

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2-3-7.(f)

Range Accurac

y Resolution

20kHz ±(3.0%+18d) 10Hz

Input sensitivity: 1V RMS value
Overload protection: 250V DC or AC peak value (less than 15
seconds)

2-3-8.(℃)

Range

Accuracy

Accuracy

Resolution

(-20～400)℃ ±(1.0%+5d) 1℃

(400～1000)℃ ±(1.5%+15d) 1℃
Sensor: K Type Thermocouple, banana plug

WARNING: DO NOT input any voltage at this range for

safety!

2-3-9.Diode and Continuity Test

Range Description Test Condition

Forward voltage
drop of diode

Buzzer sound at
less than(70±20)Ω

Forward DC Current approx.
1mA，Counter Voltage
approx. 3V
Open-circuit voltage approx.
3V

Overload protection: 250V DC or AC peak value.

2-2-10. 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!

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Ope

ration Method

1. Front Panel Description

1. LCD: Display the measuring
value
HOLD Key: Press the key,

2.
the present measuring value
is held on LCD, and appear
“Hold” symbol, press the key
again, disappear “Hold”
symbol, and exist the Date
Hold function

3. Range Knob: Switch the
measuring function and
range

4. Less than 200mA
current ,Capacitance ,Tempe

＋” ,HFE measuring terminal

rature“

5. 10A current measuring terminal

6. Voltage, Resistance, and diode, Continuity, Frequency
measuring terminal

7. In common terminal, Capacitance, Temperature“

－”, HFE,

Frequency measuring terminal

8. Power switch: Power on/off

9. Backlight switch

10. LED indicator light

2. DCV Measurement

1. Insert the black lead into the “COM” terminal, and the red

lead into “V/Ω/Hz” the terminal

2. Tern the range knob to the DCV Range, then connect the

test leads cross the tested circuit, the voltage and polarity
of the tested point connected by the red test lead are
displayed on LCD.

Note:

1

. If the tested voltage is unknown beforehand, should turn

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2. If LCD displays “1”, it indicates overload, should turn the

knob to the higher range.

3. ACV Measurement

1. Insert the black lead into “COM” terminal, and the red lead

into “V/Ω/Hz” terminal, turn the knob to the ACV range,
then connect the test leads across the tested circuit.

Note:

1. If the tested voltage is unknown beforehand, should turn

the knob to the highest range, and then turn to the relative
range according to the value displayed on LCD.

2. If LCD displays “1”, it indicates overload, should turn the

knob to the higher range.

4. DCA Measurement

1. Insert the black lead into “COM” terminal, and red lead into

“mA” terminal (Max 200mA) or red lead into “10A”
terminal(Max 10A)

2. Tern the knob to the DCA Range, then connect the test

leads into the tested circuit in series, the tested current
value and polarity of the red lead will be displayed on LCD
simultaneously.

Note:

1. If the tested current is unknown beforehand, should turn

the knob to the highest range, and then turn to the relative
range according to the value displayed on LCD

2. If LCD displays “1”, it indicates overload, should turn the

knob to the higher range.

3

. The max input current is 200mA or 10A, it depends on the

location the red lead is inserted. When measuring 10A,
note it will affect the accuracy of measurement and
damage the instrument to continuously measure large
current to make the circuit heat

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