Prokit's Industries Pro's Kit MT-1280D User manual

MT-1280D
3-5/6 True-RMS Digital Multimeter
User’s Manual
1st Edition, 2022
©2022 Copyright by Prokit’s Industries Co., Ltd.

1
1. General Information:
This digital multimeter is designed and manufactured in compliance with
IEC-61010 safety requirements on electronic measuring instruments and
hand-held digital multimeter. It is compliant with IEC-61010 requirements
pertaining to CAT IV 600V, CAT III 1000V and requirements on pollution
degree 2. Please read carefully this operation manual and pay attention to
safety guidelines before operating this meter.
1.1 Safety Information:
1.1.1 Safety Instructions:
Before operating this meter, the operator must observe all standard
safety procedures in the two respects below:
A. Safety procedures against electric shock.
B. Safety procedures against unintended use.
To ensure your safety, please use the test lead included in the meter.
Before operating this meter, ensure that the test lead is functional.
1.1.2 Safety Warnings:
When the meter is used under strong electromagnetic interferences
surroundings, the reading on the meter will be unstable and even
might be great differences in error.
Do not operate the meter when the appearance of the meter or test
lead is damaged.
The protection system of the meter might not be activated if the
meter is not properly used.
Extra attention is required while using the meter near to exposed
conductor or bus line.
Using the meter under or near explosive gas, mist or dust is
prohibited.
The measurement must be used with correct input and functions
and within the allowable measuring range.
To prevent the meter from being damaged, do not exceed the limit of
each measuring range while using the meter.
When the meter is under measuring connection, please do not touch
any unused input socket.
When the measuring voltage has exceeded 60VDC or 30VAC
(effective value), please be careful of possible electric shock.
When using the meter with the test lead, place your fingers behind
its protective ring.
Before switching to another measuring range, please make sure that
the test lead has already been undetached.

2
For all DC measuring functions, to prevent the incorrect reading
resulting in potential electric shock, please use AC functions first to
check any presence of AC voltage, then switch to DC voltage
measuring range equivalent to or greater than the value of AC
voltage.
Before testing the resistance, diode, capacitor, or continuity function,
please make sure to cut off the power of the circuit and discharge all
the electricity.
Before measuring the current, please check the fuse first and make
sure to cut off the power of the circuit.
Before repairing the TV or measuring the power switching circuit,
please be careful of the possible impulse voltage to damage the
meter.
The meter is powered by 1 x 9V 6F22 battery that must be installed
into the battery case correctly.
When symbol appears, the battery must be replaced
immediately. The low level of a battery will result in incorrect reading
on the meter which leads to an unexpected incident.
According to measurement standards, the testing voltage shall not
exceed 1000V in category III and 600V voltage in category IV
respectively.
Do not use the meter if its case is not complete.
1.1.3 Safety Symbols:
The safety symbols in the user’s manual & the meter:
The warning is an important safety symbol. The user
must read the user’s manual before using it. Incorrect
usage may lead to damage to the device or its
components.
AC (alternating current)
DC (direct current)
AC/DC
Ground
Double insulation protection
Fuse
High voltage warning
CATIII1000V
Over-voltage protection
CAT IV 600 V
Over-voltage protection

3
1.1.4 Safety Maintenance Instructions:
Please unplug the test lead before dismantling the meter or
removing the battery case cover.
Use the designated components while repairing the meter.
Before opening the meter, pleasemake sure to cut off the power and
the user is not carrying any static.
The meter can only be calibrated, repaired, and maintained by
professionals.
When the meter's case is opened, some of the capacitors might be
still carrying electricity even though the meter’s power is off.
If the user found any malfunction on the meter, please stop using it
immediately and send the meter for repair. Do not use it until the
meter is perfectly repaired.
When the meter will not be used for a long period, please remove
the battery and keep the storage environment away from high
temperature & humidity.
1.2 Protection System:
In the voltage measurement, the maximum input voltage shall not
exceed DC 1000V or AC 750V.
In the frequency, electric resistance, continuity, and diode
measurements, the maximum input voltage shall not exceed AC
250V or equivalent effective value voltage.
In the mA current measurement, the meter is protected by
F500mA/250V fuse; in the Acurrent measurement, it is protected by
F10A/250V fuse.
2. The Meter’s Profile:
This meter is a hand-held digital multimeter with the True RMS measurement.
It has a large LCD with an auto inductive backlight, it’s easy for the users to
read in the dark area. It is also equipped with overload protection and low
battery indication, and many user-friendly functions. It’s ideal for
professionals, factories, schools, hobbyists, or DIY users.
2.1 The Schematic of the Meter:
①Non-contact Voltage Detection Area
②LED Light
③Alarm Indicator
④LCD Screen
⑤Select Button

4
⑥Inductive Light Sensor
⑦Hold / Backlight Button
⑧hFE Socket
⑨LED Light Button
⑩Range Switch
⑪Input Socket
①
②
④
⑨
⑥
⑦
⑧
⑩
⑤
⑪
③

5
2.2 Screen Display Symbols:
Symbols
Description
Low Battery Indicator
To avoid electric shock or personal injury as a
result of incorrect reading, please replace the battery
immediately when the indicator appears.
APO
Auto power off indicator
Negative input polarity indicator
AC
Input voltage AC
DC
Input voltage DC
Continuity test mode
Diode test mode
Auto range test mode
HOLD
Data hold mode
FUSE
Fuse burnt alarm
BL
Auto inductive backlight on
NCV
Non-contact AC voltage detection mode
LIVE
Identify AC electric live wires
˚C/˚F
Unit of temperature(˚C: Celsius; ˚F: Fahrenheit)
Hz
Unit of frequency
%
Duty
T-RMS
True-RMS value
hFE
hFE test mode
V, mV
V:
mV:
Volt, the unit of voltage
Millivolt，1x10-3 or 0.001 volt.

6
A, mA
A:
mA:
Ampere, the unit of current.
Milliampere, 1x10-3 or 0.001 ampere.
, K, M
:
K:
M:
Ohm, the unit of resistance.
Kiloohm, 1x103ohm
Megaohm, 1x106ohm.
Hz KHz MHz
Hz:
KHz:
MHz:
Hertz, the unit of frequency
Kilohertz, 1x103Hz.
Megahertz, 1x106Hz.
mF,F, nF
F:
mF:
F:
nF:
Farad, the unit of capacitance.
Millifarad, 1x10-3 or 0.001 farad.
Microfarad, 1x10-6 or 0.000001 farad.
Nanofarad, 1x10-9 or 0.000000001 farad.
2.3 Function Button Description:
Buttons
Description
Select
1. Function select.
2. Temperature position: ˚C & ˚F switch.
3. Buzzer/Diode position: Continuity & diode
switch.
4. Hz/% position: Frequency & duty cycle switch.
5. AC voltage position: AC voltage & frequency
switch.
Hold/
1. Short-press, data hold function on.
2. Long-press, auto inductive backlight on or off.
This function will be defaulted on when turning
on the meter and BL symbol will be showed on
the screen.
LED light function.
2.4 Input Socket Description:
Socket
Description
COM
The public input socket for the black test leads to
multifunctional measurement.
VHz
˚C/˚F
The positive input socket for the red test leads to
measuring capacitance, diode, continuity,
temperature, voltage, resistance, and frequency.
mA
mA positive input socket for the red test leads.
20A
20Apositive input socket for the red test leads, do not
maintain the connection for more than 10 seconds.

7
2.5 Accessories:
1 copy of user’s manual.
1 set of test leads.
1 pc of K-type probe.
3. Operational Guidelines:
3.1 Basic Operation:
3.1.1 Data Hold (Hold/ ):
Data hold can keep the reading value on the screen.
Press once to keep the reading value and the screen will show
“HOLD” symbol; press again to return to the normal testing mode.
3.1.2 Auto Inductive Backlight:
This meter has equipped with an auto inductive backlight; and has a light
inductive sensor and the screen will light up automatically in the dark area.
Auto inductive backlight will be defaulted on when turning on the
meter, the screen will show the “BL” symbol on it.
Long-press the “Hold“ button to turn off this function and long-press
it again to turn it on.
3.1.3 LED Light ( ):
Press the button to turn on the LED light, press it again to turn it off.
3.1.4 Auto Power Off:
The meter will automatically turn off with an alarm after 15 mins
instill, to press “Select”, “Hold”, or turn the range switch to reboot it.
3.2 Measuring Instructions:
3.2.1 AC & DC Voltage Measurement:
To avoid any electric shock and/or damage to the meter, do
not measure the effective value over DC 1000V or AC 750V.
Turn the switch to the position V or ～V.
Connect the black test lead and red test lead to COM socket and V
socket respectively.
Use test lead to measure the voltage of the circuit board.
Read the measured voltage value on LCD screen.

8
Notes:
In the measurement of DC 600mV andAC 6V, if there is reading
existing without connection to the test leads. In this case, reset the
meter to zero.
Within the AC voltage function, press "Select" to measure the
frequency of theAC voltage.
The value of the AC voltage measurement is True RMS (root mean
square) value. These measurements are accurate for sine wave and
other waves (without DC offset), square wave, triangular wave and
step wave.
3.2.2 Frequency Measurement at AC V position:
To avoid any electric shock and/or damage to the meter, do not
attempt a frequency measurement if the voltage is over DC
750V or AC 750V (the effective value). The measurement is
suitable for measuring the power frequency less than 1kHz.
Turn the rotary switch to the position～V.
Press the "Select" key to select "Hz"
Connect the black test lead and red test lead to COM socket and V
socket respectively.
Use test lead to measure the frequency of the circuit board.
Read the frequency measured value on LCD screen.
3.2.3 Frequency and Duty Cycle Measurement at Hz/%
position:
To avoid any electric shock and/or damage to the meter, do
not attempt a frequency measurement if the voltage is over DC
250V or AC 250V (the effective value).
Frequency measurement at the Hz% position:
Turn the switch to the position Hz%.
Connect the black test lead and red test lead to COM socket and V
socket respectively.
Use test lead to measure the frequency of the circuit board.
Read the frequency measured value on LCD screen.
Press the "Select" to switch to "%", read the measured duty cycle
value on LCD screen.

9
3.2.4 Electric Resistance Measurement:
To avoid any electric shock and/or damage to the meter, do
not attempt a resistance measurement before cutting off the
power of the circuit and discharging all the electricity.
Ohm is the unit of electric resistance ().
Turn the switch to the resistance position.
Connect the black test lead and red test lead to COM socket and V
socket respectively.
Use test lead to measure the resistance of the circuit board.
Read the resistance measured value on LCD screen.
Notes:
The measured value of the resistance is usually a bit different from
the rated value.
To ensure measurement accuracy, in attempting a low resistance
measurement, please deduct the difference of short circuit between
two test leads.
At 60Mposition, you have to wait a few seconds before the
reading to be stabilized which is normal for a high resistance
measurement.
When the meter is in open circuit, the display will show "OL" that
indicates the measured value is over the measuring range.
3.2.5 Diode Test:
To avoid any electric shock and/or damage to the meter, do
not attempt a diode measurement before cutting off the power
of the circuit and discharging all the electricity.
Turn the switch to the position .
Connect the black test lead and red test lead to COM socket and V
socket respectively.
Use test lead to measure the diode.
If the polarity of the test leads is not corresponded while measuring
the diode, the LCD will show "OL".
A normal diode still produces a forward voltage drop of 0.5V to 0.8V;
the reverse bias voltage reading depend on the electric resistance
between the test leads.

10
3.2.6 Beep Continuity Test:
To avoid any electric shock and/or damage to the meter, do
not attempt a beep continuity test before cutting off the power
of the circuit and discharging all the electricity.
Turn the switch to the position .
Press the "Select" to switch to .
Connect the black test lead and red test lead to COM socket and V
socket respectively.
Use the test leads to measure the resistance of the circuit. If the
value is less than 50Ω±30Ω, the indication will flash & the beeper will
alarm.
3.2.7 Capacitance Measurement:
To avoid any electric shock and/or damage to the meter, do not
attempt capacitance measurement before cutting off the power of
the circuit and discharging all the electricity.
Turn the switch to the position 60mF.
Connect the black test lead and red test lead to COM socket and V
socket respectively.
Use test lead to measure the capacitance.
Read the capacitance measured value on LCD screen.
Note:
While measuring the large capacitance, please hold it for a while for
stabilizing the reading.
To avoid damage to the meter, the measurement of a capacitor with
polarities requires matching the relevant polarity.
3.2.8 Temperature Measurement:
Turn the switch to the position ˚C/˚F, press select to choose the unit.
Connect the black and red temperature sensing probe to COM
socket and V socket respectively.
Use sensing probe to measure the temperature.
Read the temperature measured value on LCD screen.
Note:
The maximum measuring temperature for the K-type thermocouple
dispatched at random is 250˚C, and its instant measuring value can

11
reach 300˚C.
3.2.9 hFE Measurement:
To avoid any electric shock and/or damage to the meter, do
not attempt the hFE test if the voltage is over DC & AC 36V.
Turn the switch to the position hFE.
Check the transistor is NPN or PNP type first, then plug in the
emitter, base and collector separately to the correct hole, the
approximate value will be showed on LCD.
3.2.10 Current Measurement:
To avoid any electric shock and/or damage to the meter, do not
attempt the current measurement if the voltage is over 250V.
In the current measurement position, when the LCD shows
"FUSE" and the buzzer alarms, the fuse is burnt. Please replace
the fuse. In the current measurement, please make sure to
apply the correct input socket, position, and measuring range.
When one of the test leads is connecting to a live circuit, please
do not connect another one to any circuit. When the
measuring current is over 5A, please do not measure over 10
seconds.
Turn the switch to the proper current position.
Note:
When the LCD shows the symbol of “LEAd” for a short time as a
reminder to plug in the test leads correctly.
Connect the black test lead to COM input socket. Connect the red
test lead to mA input socket when the measured current is less than
600mA; to 20A input socket when the measured current is
600mA~20A.
Disconnect the measured circuit, connect the black test lead to
lower voltage and the red test lead to higher voltage.
Connect the power to the circuit and will get the reading on LCD
display. If the display shows "OL", which means the input power is
over the selected range. Turn the switch to a higher measuring
range.

12
3.2.11 NCV Detection (Non-contact Voltage Detection):
Turn the switch to NCV/LIVE position, and place the detective area
near to the conductor. If the meter detects theAC voltage, the
indicators will light up with signal density (high, medium and low),
and the beeper will sounds alarms at different frequencies.
Note:
This function is for reference, the voltage may still remain even there
is no detection showed up. There are many possible factors might
block the detection.
When the meter is connecting to an input voltage, the indication
might still light up due to sensing the voltage.
There are external sources (like flashlight and motor) may trigger
non-contact voltage detection.
3.2.12 LIVE Test (Power Line Identification):
Turn the switch to NCV/LIVE position and press the Select key to
LIVE. Connect the red test lead to V socket, the buzzer will rapidly
alarm means there is live wire. If the buzzer slowly alarm or no
alarm means there is null or ground wire.
3.3 Technical Parameters
3.3.1 Overall Parameters:
Operating environment:
600V CAT IV and 1000V CAT III, Pollution level: 2
Altitude: < 2000m
Working temperature & humidity: 0~40˚C
Storage temperature & humidity: -10~60˚C (batteries shall be
removed ,RH is below 70%).
Coefficient of temperature: 0.1accuracy/˚C (<18˚C or >28˚C).
Allowable max voltage between socket and ground: DC 1000V or
AC 750V (effective value)
Fuse protection: mA position: fuse F500mA/250V; A fuse
F10A/250V
Rotation rate: approximate 3 times per second
Display unit: 6000 counts displayed on LCD screen. Automatically
show the symbol of the measurement function position.

13
Over range indication: the LCD will show "OL".
Low battery indication: “ ” will appear when the battery's voltage
is below the normal working voltage.
Input polarity indication: “” will automatically appear.
Power: 1 x 9V 6F22 battery
Dimensions: 192 mm(L)×89mm(W)×55mm(H).
Weight: approximately 320g (not included batteries nor test leads)
3.4 Accuracy Indicator
Accuracy: (reading + digit)
The warranty is 1 year upon the ex-factory date.
Reference conditions: Ambient temperature is between 18˚C and
28˚C and relative humidity is no more than 80.
3.4.1 DC Voltage:
Measuring range
Resolution
Accuracy
600mV
0.1mV
±(0.5% readings + 3 digits)
6V
1mV
60V
10mV
600V
100mV
1000V
1V
Input impedance: 10M
Max. input voltage: DC 1000V or AC 750V effective value
3.4.2 AC Voltage:
Measuring range
Resolution
Accuracy
6V
1mV
±（0.8% readings +3 digits）
60V
10mV
600V
100mV
±（1.0% readings +10 digits）
750V
1V
Input impedance: 10M
Max. input voltage: DC 1000V or AC 750V effective value
Frequency response: 40Hz-1kHz True RMS
3.4.3 Frequency at AC V Position:
Measuring range
Resolution
Accuracy
10Hz~1KHz
1Hz
± (1.0%readings +3 digits)

14
Input voltage range: AC 200mV-750V effective value.
Overload protection: DC 1000V / AC 750V.
3.4.4 Frequency at Hz/% Position:
Measuring range
Resolution
Accuracy
10Hz
0.001Hz
± (1.0%readings+ 3 digits)
100Hz
0.01Hz
1kHz
0.1Hz
10KHz
0.001 KHz
100KHz
0.01 KHz
1MHz
0.1 KHz
10MHz
0.001MHz
Input voltage range: 200mV-10V effective value.
Overload protection: 250V DC/AC
3.4.5 Duty Cycle:
Measuring range
Resolution
Accuracy
1%~99%
0.1%
± (2.5%readings +5 digits)
Input voltage range: 200mV-10V effective value.
3.4.6 Resistance:
Measuring range
Resolution
Accuracy
600
0.1
±(0.8% readings + 3 digits)
6k
1
60k
10
600k
100
60M
10k
±(1.2% readings +30 digits)
Overload protection: 250V DC/AC.
Open-circuit voltage: 1V.
3.4.7 Diode & Beeper Continuity:
Functions
Testing conditions
Diode test
Forward DC current: around 1mA; voltage: around 3.2V.
The LCD shows the approximate value of the diode's
forward voltage.
Buzzer sounds, the resistance is less than (50±30)Ω
Open-circuit voltage: around 1V
Overload protection: 250V DC/AC

15
3.4.8 hFE:
Functions
Value
Testing conditions
NPN or PNP
0~2000
Basic current is around
10μA,Vce is around 2.8V
Overload protection: 36V DC/AC
3.4.9 Capacitor:
Measuring range
Resolution
Accuracy
1nF
0.001nF
±(5.0% readings +30 digits)
10nF
0.01nF
±(2.5% readings +10 digits)
100nF
0.1nF
1uF
0.001uF
10uF
0.01uF
100uF
0.1uF
1mF
0.001mF
60mF
0.01mF
±(5.0% readings +30 digits)
Overload protection: 250V DC/AC.
3.4.10 DC Current:
Measuring range
Resolution
Accuracy
6mA
0.001mA
±(0.8% readings +3 digits)
60mA
0.01mA
600mA
0.1mA
20A
0.01A
±(1.5% readings +10 digits)
Overload protection: mAmeasuring range for F500mA/250V; 20A
measuring range for F10A/250V.
Max. input current: mAposition: 600mADC/AC (effective value);
20A position: 20A DC/AC (effective value).
When the measuring current is over 5A, please do not measure over
10 seconds, and after each measurement shall stop 1 min.
When the LCD shows "FUSE" and the buzzer alarms, the fuse is
burnt. Please replace the fuse.

16
3.4.11 AC Current:
Measuring range
Resolution
Accuracy
60mA
0.01mA
±(1.0% readings +3 digits)
600mA
0.1mA
20A
0.01A
±(2.0% readings +10 digits)
Overload protection: mAmeasuring range for F500mA/250V; 20A
measuring range for F10A/250V.
Frequency response: 40Hz-1kHz True RMS.
Maximal input current: mA position: 600mA DC/AC (effective value);
20A position: 20A DC/AC (effective value).
When the measuring current is over 5A, please do not measure over
10 seconds, and after each measurement shall stop 1 min.
When the LCD shows "FUSE" and the buzzer alarms, the fuse is
burnt. Please replace the fuse.
3.4.12 Temperature:
Measuring range
Resolution
Accuracy
-20˚C~1000˚C
1˚C
(1.0% readings +3 digits)
-4˚F ~ 1832˚F
1˚F
(1.0% readings +3 digits)
Overload protection: 250V DC/AC.
4. Maintenance
This section provides the basic information on maintenance, including the
replacement of fuse and batteries. Do not attempt the meter maintenance
unless you are experienced technician.
4.1 General Maintenance:
To avoid any electric shock or damage to the meter, do not
attempt to clean the inside of the meter. You must disconnect
all the lines, before opening the case or battery cover.
You must regularly use damp cloth and a small quantity of detergent
to clean the meter's shell. Don't attempt the use of any abrading or
chemical solvent.A dirty or damp input socket may affect reading.
Cut off the power & remove all the test leads.
Clean up all dirty substances on sockets.
Use a new cotton ball with a detergent or lubricant to clean each

17
socket, because lubricant can protect the socket from dirt & moist.
4.2 Battery & Fuse Replacement:
To avoid any electric shock or personal injury as a result of
incorrect reading, replace batteries once the symbol “ ” appear
on the LCD.
In the current measurement, if the LCD shows “FUSE” with buzzer
alarm, which means the fuse is burnt, please replace the fuse
immediately. Please use the designated fuse (500mA/250V,
10A/250V quick-break fuse).
To avoid any electric shock or damage to the meter, do not attempt
to clean the inside of the meter. You must disconnect all the lines,
before opening the case or battery cover.
Battery replacement:
Turn off the power of the meter.
Disconnect all the test leads.
Use a screwdriver to remove the battery cover.
Remove the old battery and replace with 1 pc 9 V 6F22 new battery.
Fuse replacement:
Turn off the power of the meter and take out the holster.
Use a screwdriver to remove the cover.
Remove the burnt fuse and replace with the same type of fuse

18
MT-1280D 3-5/6 真有效值電表
1. 概述
Pro’sKit MT-1280D 3-5/6 數位多用表是根據國際電工安全標準 IEC－61010 對電子測量儀
器和掌上型數位多用表的安全要求而設計生產的。
符合 IEC61010 的600V CAT IV、1000V CAT III 和污染程度 2要求。使用本儀錶前，請仔
細閱讀使用說明書並請注意有關安全工作準則。
1.1 安全資訊
1.1.1 安全說明
使用本儀錶時，使用者必須遵守關於以下兩方面的全部標準安全規程：
A. 防止電擊方面的安全規程
B. 防止錯誤使用儀錶方面的安全規程
為保證人身安全，請使用測量表筆。在使用前，檢查並確保它們是完好的。
1.1.2 安全注意事項
在電磁幹擾比較大的設備附近使用儀錶，儀錶的讀數會不穩定，甚至可能會產生
較大的誤差。
當儀錶或表筆外觀破損時，請不要使用。
若不正確使用儀錶，儀錶提供的安全功能可能會失效。
在裸露的導體或匯流排周圍工作時，必須極其小心。
禁止在爆炸性的氣體、蒸汽或灰塵附近使用本儀錶。
必須使用正確的輸入端、功能、量程來進行測量。
輸入值切勿超過每個量程所規定的輸入極限值，以防損壞儀錶。
當儀錶已連接到被測線路時，切勿觸摸沒有使用的輸入端。
當被測電壓超過 60VDC 或30VAC 有效值時，小心操作防止電擊。
使用測量筆測量時，應將手指放在測量筆的護環後面。
在轉換量程之前，必須保證測量筆已經離開被測電路。
對於所有的直流功能，為避免由於可能的不正確讀數而導致電擊的危險，請先使
用交流功能來確認是否有任何交流電壓的存在。然後，選擇一個等於或大於交流
電壓的直流電壓量程。
在進行電阻、二極體、電容測量或通斷測量前，必須先切斷被測電路電源，並將
被測電路裏所有的高壓電容器放電。
在進行電流測量前，應先檢查儀錶的保險管。在儀錶連接到被測電路之前，應先
將被測電路的電源關閉。
在進行電視機維修或測量電源轉換電路時，必須小心被測電路中的高幅電壓脈衝
以免損壞儀錶。
本儀錶使用 1 節9V 6F22 電池供電，電池必須正確安裝在儀錶的電池盒內。

19
當電池欠壓符號 出現時，應立即更換電池。 電池電量不足會使儀錶讀數
錯誤，從而可能導致電擊或人身傷害。
在進行測量類別.Ⅲ電壓測量時不可超過 1000V；進行測量類別Ⅳ電壓測量時不
可超過 600V。
儀錶的外殼（或外殼的一部分）被拆下時，切勿使用儀錶。
1.1.3 安全符號
儀錶表體及使用說明書中使用的符號：
警告，重要的安全標誌，使用前應參閱使用說明書。錯誤使用可能致
設備或它的部件的損壞。
AC（交流）
DC（直流）
交流電或直流電
接地
雙重絕緣保護
保險絲
高壓警告
CAT III
III 類1000 V 過電壓保護
CAT IV
IV 類600 V 過電壓保護
1.1.4 安全的保養習慣
打開儀錶外殼或拆下電池蓋時，應先拔出測量筆。
維修儀錶時，必須使用指定的替換零部件。
在打開儀錶前，必須斷開一切有關的電源，同時也必須確保您沒帶有靜電以免損
壞儀錶的元器件。
儀錶的校準以及維修操作必須由專業人員操作。
打開儀錶外殼時，必須注意到儀錶內的一些電容即使在儀錶關閉電源以後還保存
著危險的電壓。
如果觀察到儀錶有任何異常, 該儀錶應立即停止使用並送維修。並確保在檢查合
格前不能被使用。
當長時間不用時，請將電池取下，並避免存放於高溫高濕的地方。
1.2 輸入保護措施
在進行電壓測量時，可承受最高輸入電壓是直流電壓 1000V 或交流電壓 750V。
在進行頻率、電阻、通斷和二極體測量時，可承受不超過交流電壓 250V 或等效
的有效值電壓。
在進行 mA 電流測量時，通過保險管（F500mA/250V）進行保護；在進行 A電
流測量時，通過保險管（F10A/250V）進行保護。