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.
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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
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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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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.
4.9 TEMPERATURE MEASUREMENT
Insert the cathode of thermocouple’s cold end to " mA" jack and
anode to " COM " terminal, put the working end on or in the
tested object, temperature value can be read on LCD in Celsius.
4.10 TRIODE hFE
1. Set the range knob to hFE.
2. Verify the type of the transistor is NPN or PNP, insert the
emitter, basic and collector to the proper jack on test acces-
sory.
4.11 AUTO POWER OFF AND LCD BACKLIGHT
When power on, the LCD screen showing “APO”, means the
meter is in automatic power off mode, if there is no any opera-
tion within fteen minutes, the meter will auto power off.
Press LCD backlight button or turn the rotary selector to resume
operation of the meter. At the same time, when power is on,
press LCD backlight button for 2 seconds, the letter of “APO”
will disappear, the auto power off function will be disable, and
press LCD backlight button 2 seconds again, the “APO” function
will be enable.
5. MAINTENANCE
DO NOT try to verify the circuit for It’s a precision meter.
1. Beware of waterproof, dustproof and shockproof.
2. Do not operate and store the meter in the circumstance of
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high temperature, high humidity, and ammability, explosive
and strong magnetic eld.
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 bat-
tery.
4-1. When LCD displays " " symbol, should replace
the battery as below:
4-1-1. Take out the holster and drop out the battery case.
4-1-2. Take out the battery and replace a new one. It’s better to use
alkalescence battery for long time use.
4-1-3. Fix the battery case and take on the holster.
6. 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
BIG ERROR Replace battery
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一、概述
MT-1280儀錶是一種性能穩定、用電池驅動的高可靠性數位萬
用表。儀錶採用40mm字高LCD顯示器，讀數清晰、更加方便
使用。
此系列儀錶可用來測量直流電壓和交流電壓、直流電流和交流電
流、電阻、電容、二極體、三極管、通斷測試、溫度等參數。整
機以雙積分A/D轉換為核心，是一台性能優越的工具儀錶，是實
驗室、工廠、無線電愛好者及家庭理想工具。
二、安全事項
該系列儀錶在設計上符合IEC1010條款（國際電工委員會頒佈的
安全標準），在使用之前，請先認真閱讀說明書。
1. 各量程測量時，禁止輸入超過量程的極限值。
2. 36V以下的電壓為安全電壓，在測高於36V直流、25V交流電
壓時，要檢查表筆是否可靠接觸，是否正確連接、是否絕緣
良好等，以避免電擊。
3. 換功能和量程時，表筆應離開測試點。
4. 選擇正確的功能和量程，謹防誤操作，該系列儀錶雖然有全
量程保護功能，但為了安全起見，仍請您多加注意。
5. 在電池沒有裝好和後蓋沒有上緊時，請不要使用此表進行測
試工作。
6. 測量電阻時，請勿輸入電壓值。
7. 在更換電池或保險絲前，請將測試表筆從測試點移開，並關
閉電源開關。
8. 安全符號說明：
“”存在危險電壓，“ ”接地，“ ”雙絕緣，
“”操作者必須參閱說明書 ，“ ”低電壓符號。
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三、特性
1. 一般特性
1-1. 顯示方式：LCD液晶顯示
1-2. 最大顯示：1999(3 1/2位)自動極性顯示
1-3. 測量方式：雙積分式A/D轉換
1-4. 採樣速率：約每秒鐘3次
1-5. 超量程顯示：最高位顯“1”或“-1”
1-6. 低電壓顯示：“ ”符號出現
1-7. 工作環境：(0~40)℃，相對濕度<80%
1-8. 電源：一只9V電池（NEDA1604/6F22或同等型號）
(不含電池)
1-9. 體積（尺寸）：190×90×50mm （長×寬×高）
1-10. 重量：約335g（不含電池）
1-11. 附件：使用說明書一本，防震套、外包裝盒各一個，錶筆
一副、K型熱電偶TP01 一支。
2. 技術特性
2-1. 準確度:±(a%×讀數＋字數)，保證準確度環境溫度:
(23±5)˚C，相對濕度<75%。
2-2. 性能（注“▲”表示該表有此功能）
功能 型號 MT-1280
直流電壓DCV ▲
交流電壓ACV ▲
直流電流DCA ▲
交流電流ACA ▲
15
•輸入阻抗：10MΩ
•超載保護：1000V直流或交流峰值；
•頻率回應：40~200Hz
•顯 示：正弦波有效值（平均值響應）。
2-3-3.直流電流(DCA)
量程 準確度 分辨力
200uA ±(0.8%+10d) 0.1uA
20mA ±(0.8%+10d) 10uA
200mA ±(1.2%+8d) 100uA
20A ±(2.0%+5d) 10mA
•最大輸入壓降：200mV
•最大輸入電流：20A（測試時間不超過10秒）
•過載保護裝置：0.2A/250V;20A/250V 過載將會燒損保險絲。
2-3-4.交流電流(ACA)
量程 準確度 分辨力
20mA ±(1.0%+15d) 10uA
200mA ±(2.0%+5d) 100uA
20A ±(3.0%+10d) 10mA
•最大測量壓降：200mV
•最大輸入電流：20A（測試時間不超過10秒）
•頻率回應：(40~200)Hz
•顯 示: 正弦波有效值（平均值響應）。
•過載保護裝置：0.2A/250V;20A/250V 過載將會燒損保險絲。
16
2-3-5.電阻(Ω)
量程 準確度 分辨力
200Ω ±(0.8%+5d) 0.1Ω
2kΩ
±(0.8%+3d)
1Ω
20kΩ 10Ω
200kΩ 100Ω
20MΩ ±(1.0%+25d) 10kΩ
•開路電壓：小於0.7V
•超載保護：250V直流和交流峰值；
•注意事項：在使用200Ω量程時，應先將表筆短路，測得引線電阻，然
後在實測中減去；
警 告：為了安全在電阻量程禁止輸入電壓值！
2-3-6.電容(C)
量程 準確度 分辨力
20nF ±(2.5%+20d) 10pF
2uF 1nF
200uF ±(5.0%+10d) 100nF
•超載保護：36V直流或交流峰值。
2-3-7.溫度(℃)
量程 準確度 分辨力
(-20~1000)˚C <400˚C±(1.0%+5d)
≥400˚C±(1.5%+15d)
1˚C
•感測器：K型熱電偶（鎳鉻 —鎳硅）香蕉插頭。
17
2-3-8.二極體及通斷測試
量程 顯示值 測試條件
二極體正向壓降 正向直流電流約
1mA， 反向電壓
約3V
蜂鳴器發聲長響，
測試兩 點阻值小
於(70±20)Ω
開路電壓約3V
超載保護：250V直流或交流峰值
警 告：為了安全在此量程禁止輸入電壓值！
2-3-9.晶體三極管hFE參數測試
量程 顯示範圍 測試條件
hFE/NPN/PNP 0~1000 基極電流約
10uA,Vce約為3V
四、使用方法
•操作面牌說明
1. 型號欄
2. 液晶顯示器：顯示儀錶測量的數值
3. 發光三極管：通斷檢測時報警用
4. 旋鈕開關：用於改變測量功能、
量程以及控制開關機
5. 20A電流測試插座
6. 電容、溫度、測試附件“-”極
及小於200mA電流測試插座
1
2
10
3
4
5
6
9
8
7
18
7. 電容、溫度、測試附件“＋”極插座及公共地
8. 電壓、電阻、二極體“＋”極插座
9. 三極管測試座：測試三極管輸入口。
10.自動關機及背光功能鍵。
•直流電壓測量
1. 將黑表筆插入“COM”插座，紅表筆插入V/Ω插座；
2. 將量程開關轉至相應的DCV量程上，然後將測試表筆跨接在
被測電路上，紅表筆所接的該點電壓與極性顯示在螢幕上。
注意：
1. 如果事先對被測電壓範圍沒有概念，應將量程開關轉到最高
的檔位元，然後根據顯示值轉至相應檔位上；
2. 如螢幕顯“1”，表明已超過量程範圍，須將量程開關轉至較
高檔位元上。
•交流電壓測量
1. 將黑表筆插入“COM”插座，紅表筆插入V/Ω插座；
2. 將量程開關轉至相應的ACV量程上，然後將測試表筆跨接在
被測電路上。
注意：
1. 如果事先對被測電壓範圍沒有概念，應將量程開關轉到最高
的檔位元，然後根據顯示值轉至相應檔位上。
2. 如螢幕顯“1”，表明已超過量程範圍，須將量程開關轉至較
高檔位上。
•直流電流測量
1. 將黑表筆插入“COM”插座，紅表筆插入“mA”插座中(最
大為200mA)，或紅表筆插入“20A”插座中(最大為20A)
2. 將量程開關轉至相應DCA檔位上，然後將儀錶的表筆串聯接
入被測電路中，被測電流值及紅色表筆點的電流極性將同時
19
顯示在螢幕上。
注意：
1. 如果事先對被測電流範圍沒有概念，應將量程開關轉至較高
檔位，然後按顯示值轉至相應檔上 。
2. 如螢幕顯“1”，表明已超過量程範圍，須將量程開關轉至較
高檔位上 。
3.持續量測大電流可能會造成產品損壞。
•交流電流測量
1. 將黑表筆插入“COM”插座，紅表筆插入“mA”插座中(最
大為200mA)，或紅表筆插入“20A”插座中（最大為 20A）
2. 將量程開關轉至相應ACA檔位上，然後將儀錶的表筆串聯接
入被測電路中。
注意：
1. 如果事先對被測電流範圍沒有概念，應將量程開關轉到最高
的檔位，然後按顯示值轉至相應檔上。
2. 如螢幕顯“1”，表明已超過量程範圍，須將量程開關轉至較
高的檔位上。
3.持續量測大電流可能會造成產品損壞。
•電阻測量
1. 將黑表筆插入“COM”插座，紅表筆插入“V/Ω”插座；
2. 將量程開關轉至相應的電阻量程上，然後將兩表筆跨接在被
測電阻上。
注意：
1. 如果電阻值超過所選的量程值，則會顯“1”，這時應將開關
轉至較高檔位上；當測量電阻值超過1MΩ以上時，讀數需幾
秒時間才能穩定，這在測量高電阻時是正常的。
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