Pro's Kit MT-1280 Manual de usuario

MT-1280

3 5/6 Digital True-RMS Multimeter

User’s Manual

3rd Edition,2019

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 safe. 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. Display: LCD display.

1-2. Max. display: 5999 (3 5/6digit) auto polarity indication.

1-3. Measuring method: dual slope A/D conversion.

1-4. Sampling rate: approx. 3 times/second.

1-5. Over range indication: the LCD displays "0L."

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: 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

600mV

±(0.5%+3d)

100uV

1mV

60V

10mV

600V

100mV

1000V

±(0.8%+10d)

• 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

±(0.8%+5d)

1mV

60V

10mV

600V

100mV

750V

±(1.2%+10d)

• Input resistance: 10MΩ

• Overload protection: 1000V DC or AC peak value

• Frequency response: (40~1000)Hz True RMS

2-2-3.Frequency （Hz）at 750V position:

Range

ACCURACY

RESOLUTION

45.0~1000Hz

（1.0% reading + 5 word）

0.1Hz

Measurement range: 45Hz ~ 1000Hz

Input signal range: ≥100V AC voltage (effective value)

2-2-4.DCA

RANGE

ACCURACY

RESOLUTION

600uA

±(0.8%+10d)

0.1uA

6mA

1uA

60mA

10uA

600mA

±(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)

• 0.6A/250V Self-resettable fuse; 10A/250V fast-blown fuse

2-2-5.ACA

RANGE

ACCURACY

RESOLUTION

60mA

±(1.0%+5d)

10uA

600mA

±(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)

• 0.6A/250V Self-resettable fuse ; 10A/250V fast-blown fuse

• Frequency response: (40~1000)Hz True RMS

2-2-6. RESISTANCE (Ω)

RANGE

ACCURACY

RESOLUTION

600Ω

±(0.8%+5d)

0.1Ω

6kΩ

±(0.8%+3d)

1Ω

60kΩ

10Ω

600kΩ

100Ω

60MΩ

±(1.0%+25d)

10kΩ

600MΩ

±(5.0%+10d)

100kΩ

• Open voltage: less than 0.7V

• Overload protection: 250V DC and AC peak value

NOTE: at 600Ω range, the test leads should be short-circuited, and measure the

down-lead resistance, then, subtract from the real measuring.

WARNING: DO NOT input any voltage at resistance range for safety concern!

2-2-7. CAPACITANCE (C)

RANGE

ACCURACY

RESOLUTION

9.999nF

±(5%+35d)

10pF

9.999nF~999.9uF

±(2.5%+20d)

10nF

999.9uF~2000uF

±(5%+35d)

1uF

• Overload protection: 36V DC or AC peak value

WARNING: DO NOT input any voltage at this range for safety concern!

2-2-8.TEMPERATURE(˚C)

RANGE

ACCURACY

RESOLUTION

(-20~1000)˚C

< 400˚C±(1.0%+5d)

≥ 400˚C±(1.5%+15d)

1˚C

-4℉~ 1832℉

< 752℉±(1.0%+5d)

≥ 752℉±(1.5%+15d)

• Sensor: K-type thermocouple with banana plug

WARNING: DO NOT input any voltage at this range for safety concern!

2-2-9.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

(50±30)Ω

open voltage is approx.

• 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 concern!

3. OPERATION

3.1 Front panel description

1. LCD display

2. Back light switch

3. Power switch

4. Range knob

5. 20A current jack

6. Less than 600mA current, HFE jack

7. COM: capacitance, temperature“-”, hFE test accessory, diode, continuity jack

8. Volt, resistance, Capacitance ,Temperature“+” diode and continuity jack

9. Hold or diode and Buzzer sounds or Hz switch

10. LED indicator light

11. Non-contact voltage detection area

3.2 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 LCD.

NOTE:

1.If the measured voltage is unsure beforehand, the range knob should be set to the

highest range; then, switch to a proper range according to the display value.

2.If LCD displays "0L.", it means over range, the range knob should be set to a

higher range.

3.3 ACV MEASUREMENT

1.Insert the black test lead to "COM " jack, the red one to V/Ωjack.

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, the range knob should be set to the

highest range; then, switch to a proper range according to the display value.

2.If LCD displays "0L.", it means over range, the range knob should be set to a

higher range.

3.The value of the AC voltage measured with this meter is True RMS (root mean

square). These measurements are accurate for sine wave and other waves

(without DC offset), square wave, triangular wave and step wave.

3.4 Frequency 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 AC 750V range, press the " /SEL" key to select

"Hz" measurement mode, connect the test leads across to the circuit under tested.

3.When the measured signal ≥100V and the frequency is within the range of

45Hz~1000Hz，the LCD of the meter will display frequency value of the voltage.

3.5 DCA MEASUREMENT

1.Insert the black test lead to "COM " jack and the red one to "mA" jack(max.

600mA) ,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, the range knob should be set to a

higher range; then, switch to a proper range according to the display value.

2.If LCD displays "0L.", it means over range, the range knob should be set to a

higher range.

3.Max. input current is 600mA 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, or even damage the meter.

3.6 ACA MEASUREMENT

1.Insert the black test lead to "COM" jack and the red one to "mA" jack(max. 600mA),

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, the range knob should be set

to the highest range, then set to a proper range according to the displayed value.

2.If LCD displays "0L.", it means over range, the range knob should be set to a

higher range.

3.Max. input current is 600mA 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, or even damage

the meter.

4.The value of the ACA measurement with this meter is True RMS (root mean

square). These measurements are accurate for sine wave and other waves

(without DC offset), square wave, triangular wave and step wave.

3.7 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 "0L."; thus, the range knob should be set 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.

3.8 CAPACITANCE MEASUREMENT

1.Insert the red test lead to " V/Ω" 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.The measuring range for the capacitance of this meter is from 1.000nF to

2000F.

2.If LCD displays "0L." , it means over 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

3.9 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, press the key " /SEL"to select the "

",connect the test leads to the diode under measured, reading is the approximation

of the diode positive volt drop.

3.Press the key "HOLD" to select the " "Connect the test leads to two points of

the measured circuit, if buzzer sounds, the resistance is lower than approx.

(50±20)Ω.

3.10 TEMPERATURE MEASUREMENT

Insert the cathode of thermocouple’s cold end to " COM" jack and anode to " V/Ω"

terminal, put the working end on or in the tested object, temperature value can be

read on LCD in Celsius.

Press the key " /SEL"to select " or ".

Notes: The maximum measuring temperature for the K-type thermocouple

dispatched at random is 250℃, and its instant measuring value can reach 300℃.

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