MT-1710N
3 3/4 True-RMS Auto Range Multimeter
User’s Manual
1st Edition, 2023
©2023 Copyright by Prokit’s Industries Co., Ltd.
1
I. INTRODUCTION
The instrument is a stable and high-performance digital multimeter driven by
battery. It uses the LCD with 42mm high to make the readings clearly.
The instrument has the function of measuring DCV, ACV, DCA, ACA,
Resistance and Capacitance, Frequency, Diode, Triode, Continuity test,
Temperature, Auto power off (can be canceled) and backlight function. The
instrument takes dual-integral A/D converter as key point, is an excellent tool.
It’s an ideal tool for lab, factory, and family.
The new generation series of productions add NCV (non-contact ACV
induction measurement) and torch function based on the original function.
II. OPEN THE PACKAGE FOR CHECKING
Open the box, take out the meter, checking the items below if they are
missing or damaging:
K type probe (-20℃~250℃) 1pc
hFE test Adapter 1pc
Test leads 1pair
User manual 1pc
Please contact with your supplier if you find out any problems.
III. SAFETY NOTES
This series meter meets the standard of IEC61010 (the safety standards
request issued by IEC or equal GB4793.1 standards). Read it before
operation.
1. Input over range is prohibited in each range during the test.
2. Voltage less than 36V is safety voltage. When measuring voltage higher
than 36V DC, 25V AC, check the connection, insulation of test leads to
avoid electric shock.
3. When changing function and range, test leads should be removed from
testing point.
4. Select correct function and range.
5. Don’t operate the meter when the battery case and back cover are not
fixed
2
6. Don’t input voltage during the resistance measurement.
7. Test lead should be removed from testing point before changing the
batteries or fuses and turn off the power.
8. Comply with local and national safety regulations, wear personal protective
equipment (approved rubber gloves, masks and flame-retardant clothing,
etc.), to prevent electric shock and arc injury caused by exposure of
dangerous electric conductor.
9. Make measurements using only the correct measurement standard class
(CAT), voltage and current rated probe, test conductor and adapter.
10．Safety symbols:
“” exists high voltage
“ ” GND
“ ” Dual Insulation
“” Must Refer to Manual
“ ” Low Battery
IV. SAFETY SYMBOLS
V. SPECIFICATIONS
GENERAL SPECIFICATIONS
1) Display mode: LCD displaying.
2) Max. indication: 3999（3 3/4）, auto polarity indication
3) Measuring method: Dual integral A/D conversion
4) Sampling rate: Approx. 3times/second
5) Over range indication: “OL” displays
6) Low battery: The “ ” displays.
7) Operating environment: (0 ~ 40) ℃, humidity<75%RH.
8) Storage environment:-20℃~60℃，humidity<85%RH
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9) Power: Four 1.5V AAA batteries, LR03
10) Dimension: 186mm×92mm ×52mm.
11) Weight: approx. 355g (not include batteries).
VI. EXTERNAL STRUCTUR
1. Sound alarm indicator light
2. LCD display
3. Function / range knob
4. Measuring input terminal
5. Function selection button
6. Auto / manual range
conversion
7. Relative value measurement
/ flashlight control
8. Data hold / backlight control
9. NCV induction position
10. Flashlight window
11. Hang hole
12. Screws for fixing the battery box
13. Bracket
14. Test leads holder
VII. LCD DISPLAY
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VIII. KEY DESCRIPTION
1. Data hold:
Short press the "HOLD B/L" button to hold the measuring data on the
LCD, and the symbol “HOLD” appears. If you press the key again, the
data hold function will be closed, and the symbol will disappear.
Warning: to prevent possible electric shock, fire, or
personal injury, do not use the data hold function to measure the
unknown voltage. When open the HOLD function, the LCD will
keep original data when measuring a different voltage.
2. Backlight function:
Long press the "HOLD B/L" button to turn on the back light of the LCD,
and long press this key again to turn off the back light.
3. Function select key (Hz/DUTY SELECT key)
At the DC/AC mV、uA、mA、A range, short press the "Hz/DUTY
SELECT" key to convert among DCV, ACV, and DCA, ACA for testing;
At the diode/continuity test range, short press the "Hz/DUTY
SELECT" key to convert the diode and continuity test, the diode range
is already set by default. At the ACV range, short press the "Hz/DUTY
SELECT" key to cycle switch among the voltage, accompanying
frequency, duty cycle. At the temperature range, short press the
"Hz/DUTY SELECT" key to convert the Celsius and Fahrenheit; At the
1
Auto range
2
Auto power off
3
DC measurement
4
AC measurement
5
High voltage
6
True RMS
7
Diode/continuity test
8
Data hold
9
Relative value
measurement
10
Low battery
11
Triode
12
Temperature
13
Duty cycle
14
Current / Capacitance
15
Resistance/ Frequency
5
Frequency range, short press the "Hz/DUTY SELECT" key to convert
the Frequency and duty cycle test.
4. Auto / manual range conversion
The auto range is already set by default after the meter is turned on,
short press the "RANGE" key, the meter convert to manual range, the
“AUTO” symbol on the LCD will disappear. At the manual range mode,
the meter starts from the low range, when you press the "RANGE" key,
the range change to a higher one, the procedure repeats like this in
sequence; long press "RANGE" key to exit the manual range mode, and
the LCD displays "AUTO" symbol.
5. Relative measurement
At the DC/AC mV、V、uA、mA、A range, capacitance, temperature
range, short press the "REL" key to enter the relative measurement
mode, and the “REL” symbol appears on the LCD. Short press the
“REL” key again, the meter exits the relative measurement mode, and
the “REL” symbol disappears.
6. Lighting
Long press "REL/ " to turn on/off the Flashlight.
7. Cancel the auto power off function
Press the “Hz/DUTY SELECT” key to turn on the meter, the “APO”
symbol disappears, and then the auto power off function closed.
IX. MEASUREMENT INSTRUCTIONS
First, please check the battery, and turn the knob to the proper range
that you need. If the battery is out of power, the " " symbol will
appear on the LCD. Pay attention to the symbol next to the jack
for test leads. This is a warning that the voltage and current should not
exceed the indicated value.
1. DCV and ACV measurement
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1-1. Set the knob to the mV/ACV/DCV range, and connect the test
leads across to the circuit under test. The voltage and polarity of the
point which the red test lead is connected are display on the LCD.
1-2. Insert the black test lead to “COM” jack, the red one to “ ”
jack.
1-3.The auto range is already set by default after the meter is turned on,
LCD displays “AUTO” symbol, press the "RANGE" key to convert
to manual range, the range 40mV,400mV (only for DC mV/AC mV
range), 4V, 40V, 400V, 1000V/750V (DCV/ACV) are optional.
1-4.You can get the result from LCD.
1-5. At the DC mV/AC mV range, short press the “Hz/DUTY SELECT”
key to convert DC/AC mV measurement. The DC mV range is
already set by default after the meter is turn on.
Note:
(1) Do not input a voltage over DC 1000V or AC 750V，otherwise the
circuit might be damaged. At the DC/AC mV range, the input
voltage should not exceed 250VDC/ AC RMS.
(2) Please keep the test leads away from the circuit after finished your
testing.
(3) When measured voltage is higher than 220V, it’s necessary to wear
personal protective equipment (such as approved rubber gloves,
face masks, and flame-retardant clothing etc.) to prevent the injury
from electric shock and arc.
2. DCA and ACA measurement
2-1. Set the knob to a proper DCA/ACA range, and then connect the
test leads to the power or circuit under test in series. The polarity
and the current value of this point which connects to the red test
lead will display on the LCD.
2-2. Insert the black test lead to “COM” jack, the red one to “ ” (max.
400mA) or “10A” (max. 10A) jack.
2-3. You can get the result from display.
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2-4. Short press the “Hz/DUTY SELECT” key to convert DCA or ACA,
the DCA range is already set by default after the meter is turned on.
Short press “RANGE” key to convert to manual range, you can
choose 400uA, 4000uA at the uA range, and 40mA, 400mA are
optional at the mA range, 4A, 10A are optional at the A range. The
auto range is already set by default after the meter is turned on.
Note:
(1) If the tested current range is unsure beforehand, please start from
the highest range then find the proper range according to the
reading. Do not measure the voltage in the current jack.
(2) If the reading displays “OL”，the value is beyond the present range.
Now you need to set the knob to the higher range.
(3) Be careful when measuring 10A range. Continuous measurement of
high current will heat the circuit, even affect the accuracy and
damage the meter.
(4) When measuring the large current above 10A, it’s necessary to wear
personal protective equipment (such as approved rubber gloves,
face masks, and flame-retardant clothing etc.) to prevent the injury
from electric shock and arc.
3. Resistance measurement
3-1. Set the knob to resistance range, then connecting the test leads to
the tested resistance.
3-2. Insert the black test lead to “COM” jack, the red one to
“ ”jack.
3-3. You can read the measurement results from the display.
3-4. Auto range method is already set by default after the meter turned
on, short press “RANGE” key to convert to the manual range, The
range 400Ω, 4KΩ, 40KΩ, 400KΩ, 4MΩ, 40MΩ are optional.
Note:
(1) If "OL" displays on LCD, it means over range, now you need to set
the range knob to the higher range. When measuring resistance is
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more than 1MΩ, the reading may take a few seconds to stabilize.
This is normal for high resistance measurement.
(2) When the input terminal is under open circuit, the figure "OL" will
be displayed for the overload condition.
(3) When checking in-circuit resistance, be sure the power has been
switched off and all capacitors are fully discharged.
4. Capacitance measurement
4-1. Set the range knob to a proper capacitance range, connect the test
leads to the capacitor under tested (the polarity of red test lead is “+”).
4-2. Insert the red test lead to “ ” jack and the black one to “COM”
jack.
4-3. You can get the result from LCD.
Note:
(1) If the LCD displays "OL", it indicates the value is over range. The
maximal range is 100mF.
(2) When measuring capacitance, because of lead wire and the
distributed capacitance, there may be some residual reading
without connection to capacitance under measured. It will be
clearer when measuring small capacitance range. Measuring result
is to subtract the residual reading for getting accurate reading. This
will not affect the measuring accuracy. You can short press the
“REL” key to clear the residual reading of open circuit, then
measuring the relative value.
(3) When under a large capacitance range, if capacitor is broken or
leakage, the LCD will display some value and it’s unstable.
(4) Discharge all the capacitance completely before measuring to avoid
the damage of the meter.
(5) UNIT: 1mF=1000uF 1uF =1000nF 1nF=1000pF
5. TRANSISTOR hFE
5-1. Set the knob to “hFE” range.
5-2. Insert the adapter to “ ” and “COM” jack, then according to
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the NPN or PNP, insert emitter, base and collector to proper jack.
5-3. You can get the result from LCD.
6. Diode and continuity test
6-1. Set the range knob to the “ ” range. The diode range is already
set by default after the meter is turned on, short press the “Hz/DUTY
SELECT” key to convert the diode and continuity test. Set the black
test lead to “COM” jack, and the red one to “ ”jack (the polarity of
red test lead is “+”), meanwhile connect the red test lead to the positive
of the diode and the black one to the negative. The reading is the approx.
value of the diode positive volt drop. If the test leads connect to the
reverse polarity of diode, the LCD will display “OL”.
6-2. Connect the test leads to two ends of the circuit under tested, if the
resistance is lower than approx.（50±20）Ω, the LCD displays “ ”
symbol, and the buzzer sounds.
7. Frequency measurement
7-1.Turn the knob to frequency range, and connect the test leads or
shielded cable across the signal source or the load under tested.
7-2.Insert the black test lead to the "COM" jack and the red one to the
" "jack.
7-3.You can get the result from the LCD.
7-4.Short press the “Hz/DHTY SELECT” key to convert to duty cycle.
Note:
(1) When it is over 10V RMS, you can get the result, but we cannot
promise the accuracy.
(2) It is preferable to use shielded cable for measuring small signal in
noisy environment.
(3) Be careful when measuring high voltage.
(4) Do not input a voltage over DC 250V or AC peak value to avoid
damage to the meter.
(5) It is auto range at the frequency range, you can test 10Hz ~20MHz.
8. Temperature measurement
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When measuring temperature, insert the negative of the
thermocouple sensor into the "COM" jack, and insert the positive into
the “ ” jack; put the sensing part of the temperature probe on or
inside the tested object. Read the value from the LCD which shows as
Celsius. Short press the “Hz/DHTY SELECT” key can convert the
Celsius or Fahrenheit unit.
9. Non-contact voltage induction measurement NCV
9-1. Turn the knob to “NCV” range.
9-2. NCV induction voltage range is 48V~220V, let the upper position
of the meter close to the measured electric AC power line, when the
ACV is sensed, the upper red indicator lights of the meter flashing
and at the same time a buzzer alarm on, the more close to the AC
power line, the more stronger the ACV sensed, the corresponding
flashing lights, and the buzzer alarm sounds faster.
10. Automatic power on/off
To save power consumption and prolong battery life, the APO
automatic shutdown function will be turned on by default after the
meter is turned on. If the user does not operate the meter within 14
minutes, the meter will be prompted with 3sounds. If there is still no
operation, the meter will automatically turn off the power after a long
sound one minute later. Short press “SELLECT” can turn on the
multimeter. To cancel APO function, please refer to the instructions in
section 8, "key function".
X. Technical characteristics
Accuracy: ± (a% × reading + digit)
Environment temperature: (23±5) ℃
Relative humidity: <75%RH.
One year guarantee since production date.
10-1. DC Voltage
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Range
Accuracy
Resolution
Input
impedance
Overload
protection
4V
±(0.5%+4d)
1mV
About 10MΩ
1000V DC / AC
RMS
40V
10mV
400V
100mV
1000V
±(1.0%+6d)
1V
10-2. DC mV
Range
Accuracy
Resolution
Input
impedance
Overload
protection
40mV
±(0.5%+5d)
0.01mV
>40MΩ
250VDC / AC
RMS
400mV
0.1mV
10-3. AC mV (True RMS)
Range
Accuracy
Resolution
Input
impedance
Overload
protection
40mV
±(1.0%+6d)
0.01mV
About
10MΩ
250V
DC/AC RMS
400mV
0.1mV
10-4. ACV (True RMS)
Range
Accuracy
Resolution
Input
impedance
Overload
protection
4V
±
(0.8%+10d)
1mV
About 10MΩ
1000V DC /
750AC RMS
40V
10mV
400V
100mV
750V
±
(1.2%+10d)
1V
Accuracy measurement range: 10%-100% of the range.
Frequency response: 40Hz-1 kHz.
Measurement mode (sine wave): true RMS.
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Crest factor: CF≦3, adding an additional error of 1% to the reading at
CF≧2.
AC frequency measurement error: 0.2%+0.02Hz.
AC frequency measurement range: 40Hz~1k Hz.
AC frequency input sensitivity: 80V~600V
10-5. DCA
Range
Accuracy
Resolution
Load voltage
Overload
protection
400uA
±(1.0%+10d)
0.1uA
0.1mV/ mA
FUSE
400mA/250V
4000uA
1uA
0.1mV/ mA
40mA
±(1.2%+8d)
10uA
1.552mV/ mA
400mA
100uA
1.637mV / mA
4A
±(1.2%+10d)
1mA
31.789mV/ A
FUSE
10A/250V
10A
10mA
31.789mV/ A
10A (test within 10 seconds); Recovery time is 15 minutes.
10-6. ACA (True RMS)
Range
Accuracy
Resolution
Load voltage
Overload
protection
400uA
±(1.5%+10d)
0.1uA
0.1mV/ mA
FUSE
400mA/250V
4000uA
1uA
0.1mV/ mA
40mA
10uA
1.552mV/ mA
400mA
100uA
1.637mV / mA
4A
±(2.0%+5d)
1mA
31.789mV/ A
FUSE
10A/250V
10A
10mA
31.789mV/ A
Measuring range of accuracy value: 10% - 100% of the range.
Frequency response: 40Hz - 1k Hz
Measuring way (sine wave): True RMS
Crest factor: CF≤3, when CF≥2, add an additional error of 1% of the
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reading.
10A (The measurement should not be more than 10 seconds);
Recovery time is 15 minutes.
10-7. Resistance
Range
Accuracy
Resolution
Short-circuit
current
Open-circuit
voltage
400Ω
± (0.8%+5d)
0.1Ω
About 0.4mA
About 1V
4kΩ
± (0.8%+4d)
1Ω
About 100uA
40kΩ
10Ω
About 10uA
400kΩ
100Ω
About 1uA
4MΩ
1kΩ
About 0.2uA
40MΩ
± (1.2%+10d)
10kΩ
About 0.2uA
About 0.5V
Measuring error does not include lead resistance.
Overload protection: 250VDC/AC RMS
10-8. Capacitance
Range
Accuracy
Resolution
Overload protection
6nF
±(5.0%+40d)
0.001nF
250VDC/AC RMS
60nF
±(3.5%+20d)
0.01nF
600nF
0.1nF
6uF
0.001uF
60uF
0.01uF
600uF
0.1uF
6mF
±(5.0%+10d)
0.001mF
60mF
±10%
0.01mF
100mF
0.1mF
Measuring range of accuracy: 10% - 100% of the range
Large capacitance response time: ≥1uF about 8s
Measurement error does not include lead distribution capacitance.
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10-9. Frequency
Range
Accuracy
Resolution
Overload protection
10Hz
±(0.5%+10d)
0.01Hz
250VDC/AC RMS
100Hz
0.1Hz
1kHz
1Hz
10kHz
10Hz
100kHz
100Hz
1MHz
1kHz
20MHz
10kHz
Note: The reading will be zero if the signal is below 3Hz.
Input sensitivity: 1V
10-10. Diode and continuity Test
Range
Displaying value
Test Condition
Error
Positive voltage
drops of diode
The positive DC Current
is approx. 1.5mA.
Negative voltage is
approx. 3.2V.
5%
Buzzer sounds, the
resistance is less
than 50±20Ω
The test current is
approx. 0.4 mA
Warning: Do not input voltage at this range.
Overload protection: 250V DC/AC RMS
10-11. Temperature
Range
Accuracy
Resolutio
n
Overload
protection
(-20-1000)℃
<400℃ ± (1.0%+5d)
≥400℃ ± (1.5%+15d)
1℃
250V DC/AC
RMS
(-4~1832)℉
<752℉ ± (1.0%+5d)
≥752℉ ± (1.5%+15d)
1℉
Sensor: Type-K thermocouple (Ni-Cr – Ni-Si) banana probe
15
10-12. Transistor hFE DATA TEST
Range
Displaying range
Test condition
hFE NPN or
PNP
0 ~ 1000
Basic current is approx. 10uA ，
Vce is about 1.5V
XI. Replace the battery or fuse.
1. Move away the test leads from the circuit under test, pull out the test lead
from the input jack, turn the range knob to the “OFF” range to turn off the
power.
2. Use a screwdriver to twist off the screws on the battery cover and remove
the battery cover and bracket.
3. Take out the old battery or the broken fuse, then replace with a new alkaline
battery 9V or a new fuse.
4. Close the battery cover and use a screwdriver to tighten the screws on the
battery cover.
5. Battery specifications:4 * 1.5V AAA alkaline batteries
6. Fuse specifications:
mA input fuse "FS1": φ5 * 20mm 400mA 250V
10A input fuse "FS2": φ5 * 20mm 10A 250V
Note: When the low voltage " " symbol displays on the LCD, the battery
should be replaced immediately, otherwise the measuring accuracy will be
affected.
XII. MAINTENANCE AND CARE
It is an accurate meter. Do not try to modify the electric circuit.
1. Pay attention to the waterproof, dustproof and break proof of the meter.
2. Please do not store or use it in environment of high temperature, high
humidity, high flammability or strong magnetic.
3. Please wipe the meter with a damp cloth and soft detergent, and abrasive
and drastic solvent such as alcohol are forbidden.
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4. If do not operate for a long time, should take out the battery to avoid
leakage.
5. When replacing fuse, please use another same type and specification fuse.
13. Trouble Shooting
If the meter does not work properly, check the meter as following:
Fault
Solution
No reading on LCD
Power off--- Pls turn on the
power
Holding key-- Pls set a correct
mode
Replace battery
The signal appears
Replace battery
No current or temperature input
Replace fuse
Error Value
Replace battery
This user’s manual is subject to any change without further notice.
The content in this user’s manual is deemed correct; if you find any mistake,
omission, etc., please contact the manufacturer.
We will not be held liable for any accidents or harms caused due to your
wrong operations.
The functions set forth in this user’s manual shall not be regarded as
reasons for applying this product for special purposes.
17
3-3/4 真有效值自動量程電錶使用手冊
一、 產品概述
MT-1710N（3 3/4）真有效值自動換檔電錶是一台性能穩定、可靠性高的電池驅
動數位萬用電錶。它採用了 42mm 字高的 LCD 顯示器，擁有背光顯示及超載保護功能，
更方便使用者操作。
該儀器具有測量 DCV、ACV、DCA、ACA、電阻、電容、頻率、溫度、電晶體、二
極體和通斷測試、自動關機開啟或關閉、NCV 非接觸驗電、LED 輔助照明等功能，採
用雙積分 A / D 轉換的核心處理器，是一台性能優越的工具儀錶，適合在實驗室、
工廠、家庭使用及無線電愛好者的理想工具。
二、 包裝清單：
測試錶筆 x1 副；K型溫度測量探頭(-20℃～250℃)x1；電晶體/電容測試座 x1；
說明書 x1。
三、 安全注意事項
該儀錶的設計符合 IEC61010 標準。操作之前，請先閱讀說明書安全注意事項。
1. 各量程測量時，禁止輸入超過量程的極限電壓。
2. 電壓低於 36V 為安全電壓，當測量電壓高於 36V DC/25V AC，請檢查連接測試
錶棒是否可靠接觸、正確連接、絕緣良好，以避免觸電。
3. 轉換測量功能和測量範圍時，測試錶棒應離開測試點。
4. 謹防誤操作，選擇正確的功能和量程，該電錶雖然有全量程保護功能，但為了
安全起見，請你多加注意。
5. 電池沒有裝好或後蓋螺絲沒有上緊時，請不要使用此錶進行測量工作。
6. 測量電阻、電容、二極管、通斷測試，請勿輸入電壓信號。
7. 在更換電池或保險絲前，請將測試錶筆從測試點移開，並關閉電源開關。
8. 遵守當地和國家安全規範，穿戴個人防護用品（經認可的橡膠手套、面具和阻
燃衣物等），以防危險帶電導體外露時遭受點擊和電弧而受傷。
9. 僅使用正確的測量標準類別（CAT）、電壓和電流額定探頭、測試導線和適配器
進行測量。
10. 安全符號
“ ” 存在危險電
壓,
“ ”接地
“ ” 雙絕緣
“ ”必須參照說明書
“ ”電池電量低
四、 電氣符號
警告!
直流
高壓危險！
交流
18
接地
交直流
雙絕緣
保險絲
電池電量低
符合歐盟 CE 指令
五、 綜合特性
顯示方式：液晶屏顯示
最大顯示：3999（3 3/4），自動極性指示
測量方法：雙斜率積分 A/D 轉換器
操作不斷電功能
採樣速率：約每秒鐘 3次
超量程顯示：最高位顯示 “OL”
電池電量低：“ ”
工作環境：溫度 0〜 40℃，濕度< 75％ RH
儲存環境：溫度-20〜 60℃，濕度< 85％ RH
電源：1.5V 電池 AAAx4（LR03）
尺寸：186× 92× 52 毫米
重量：大約 355 克（不包括電池）
六、 外觀結構（圖 1）
1. 聲音報警指示燈
2. LCD 顯示屏
3. 功能/檔位開關
4. 測量輸入端
5. 功能選擇按鍵
6. 手動/自動量程切換
7. 相對值測量/手電筒開啟/關閉
8. 數據保持/背光開啟/關閉
9. NCV 感應位置
10.手電筒窗口
11. 掛鉤
12. 電池倉固定螺絲
13. 斜立支架
14. 錶筆固定架
七、 顯示屏
19
八、 按鍵功能
1.數據保持：
短按“HOLD B/L”鍵，儀錶 LCD 顯示屏上保持顯示當前處理值，同時“HOLD”
字元顯示，再按一次該鍵，退出數據保持模式，“HOLD”字元不顯示。
警告：為防止可能發生的觸電、火災或人身傷害，請勿使用 HOLD 功能測量
未知電位。開啟 HOLD 後，在測量到不同電位時，顯示屏數字不會發生改變
2.背光控制：
長按“HOLD B/L”鍵，儀錶 LCD 背光燈點亮，再次長安該鍵，關閉背光燈。
3.功能選擇按鍵“Hz/DUTY SELECT”:
在交流 mV、uA、mA、A檔，短按“Hz/DUTY SELECT”鍵，可切換交直流電壓、交
直流電流測試；在二極管/通斷蜂鳴檔，短按該鍵，可切換二極管、通斷測試，儀錶
開機默認二極管測試；在交流電壓檔，短按該鍵，可切換電壓、頻率、佔空比測試；
在溫度檔，短按該鍵，可切換攝氏度（℃）、華氏度（℉）測試；在 Hz 檔，短按該
鍵，可切換頻率、佔空比測試。
4.自動/手動量程轉換（RANGE 鍵）:
1
自動量程
2
自動關機
3
直流測量
4
交流測量
5
高壓
6
真有效值
7
二極管/通斷測試
8
數據保持
9
相對值測量
10
電池電量不足
11
電晶體測量
12
溫度：℃/℉
13
佔空比測量
14
電容：nF/uF/mF;
電壓：mV/V
電流：uA/mA/A
15
電阻:Ω/KΩ/MΩ; 頻率:Hz KHz MHz
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