Pro's Kit MT-2017N User manual

MT-2017N
Smart Protective Function Analog Multimeter
User’s Manual
1st Edition,2020
© 2020Copyright by Prokit’s Industries Co., Ltd.

1
INTRODUCTION
This Multi-meter is an accurate, safe handheld meter that comes with
mirrored Aluminum dial, robust protective holster alongside, built-in stand
and hook-up design. MT-2017 is powered by batteries, offers accurate,
reliable measurement of DC/AC Voltage, +/-DCV, DC Current, Resistance
and Diode, LED, Transistor, Decibels, Continuity test and Capacitance with
very high sensitivity quality movement.
This meter is designed with double-sided glass-epoxy PCB, full overload &
misused protection via two Fuses, voltage Suppressor & Diodes, and smart
protection on Ω testing via the extra Resettable Fuse & Varistor. Ideal for
indoor use in laboratory, school, workshop, and home applications.
SPECIFICATION
Safety Category: IEC61010-1, CAT II 1000V, CAT III 500V and Pollution
Degree 2.
Common Environment: 23C5C, less than 75% RH.
Operating temperature: 0C to 40C, 32 F to 104 F
Storage temperature: -10 C to 50C, 14 F to 122F
Operating Humidity Scope: Less than 90% RH.
Storage Humidity Scope: less than 80% RH.
Dimensione: 171(W) x 108(D) x 37(H) MM
Weight: 370g approx. (including batteries 3pcs)
Accessories: One pair of test leads;
Two Spare Fuses: 0.5A/250V & 10A/250V, Φ5x20mm
Test
Functions
Range
Accuracy
Remarks
DC V
0-0.1-2.5-10-50-
250 V-1000V
3% FSD.
4% FSD.
For 1000V
Input Impedance:
20KΩ /V Overload
Protection: Max.
1000V AC/DC
BUT 0.1V/2.5V/10V
250V Max.
Null DCV
±-5V, ±25V
5% FSD.
Input Impedance:
40KΩ /V Overload
1000V Max.
AC V
0-10-50-250V
-1000V
4% FSD.
5% FSD.
For 1000V
Input Impedance:
9KΩ /V Overload
Protection: Max.

2
1000V AC/DC
But 10V/50V only
250V Max. Band
width: 40 ~10K Hz
DC mA
0-0.05-2.5-25-25
0 mA, 10A
3% FSD.
4% FSD.
For 10A
Drop Voltage: 250
mV Overload
protected by Fuses
0.5A/250V & 10A /
250V at 10A range,
Max. test time
15sec. for 10A.
Ω
X 1: 0.2 ~ 2KΩ
Midscale at 20Ω
X 10: 2 ~ 20KΩ
Midscale at
200Ω
X 100: 20 ~
200KΩ
Midscale at
2000Ω
X1K: 200~ 2MΩ
Midscale at
0KΩ
X10K: 2K
~20MΩ
Midscale at
200KΩ
4% of
ARC of
Scale
Length
Overload protected
the extra thermal
Resettable Fuse &
Varistor <250V
AC/DC (30s.).
Normal test can be
auto-restored
within 1 minute
after the voltage
load removed off.
Capacitance
(uF)
C: 2,000uF Max.
.
Approx.
Value
Use the R x 1K
range

3
BATT Check
0 ~ 1.5V: GOOD
- ? –BAD
0 ~ 9V: GOOD
- ? –BAD
5% of
ARC of
Scale
Length
Load Current:
270mA for 1.5V
25mA for 9V
Overload protected
by Fuse & voltage
Suppressor <250V
AC/DC(5s).
Transistor
Check
hFE: 0-1000 via
special hFE
socket
Approx.
Value
At Ω X 10 Range
LED, Diode
Check
via special hFE
socket
Approx.
Value
At Ω X 10 Range
Decibel
-22 dB ~ + 62
dB (0dB=1mW
at 600Ω )
Approx.
Value
At ACV ranges
Via Test Leads
Continuity
Check
Beeper
sounding under
200 Ohm
Overload protected
by Fuse & voltage
Suppressor <250V
AC/DC(5s).
POWER
Source
Internal Battery:
R3P, AAA, 1.5V
2pcs, 6F22,
NEDA1604, 9V
1pc
CALIBRATION
Ohms Zero Adjustor located at the right side of the panel. Adjust the meter
pointer to the Zero mark on the right side of Ohm scale of the meter dial
when the test leads are touched together.
Mechanical Adjustor Screw: located right side below the center of the meter
dial to set pointer to Zero mark at the left side of the scale.
(-) Jack: Plug-in connector at the lower left on the panel for black, negative
test lead.

4
(+) Jack: Plug-in connector at the lower right on the panel for Red, positive
test lead.
STAND & HOOK-UP
This meter can be used in any operating position. It has two rear support
devices, i.e. the upper small bracket and the lower big tilt device. The upper
one not only performs the light slanted position, but also hook-up the tester
which makes it easier to place the tester and read the display when
measuring.
And the lower big tilt device can provide the steeper slant degree position
easy for user’s reading too.
OPERATING INSTRUCTIONS
CAUTION!
When making voltage or current measurements, develop the habit of
turning off all power to the circuit under test. Connect the test leads at the
desired points in the circuit, and then turn on the power while taking
readings. Turn off the power before disconnecting the test leads from the
circuit.
INTERNAL BATTERY CHECK
To check the battery condition, insert the black test lead into the (-) jack.
Set the range switch to the R X1 range position and short the ends of the
two sides of the test leads. If the pointer can not be brought to the zero
mark, replace the 1.5V cells or 9V cell. (See battery replacement.)
BEFORE OPERATING
1. Set the range switch to the proper position before making any
measurement.
2. Never apply more voltage or current than the rated value in every
position.
3. When the voltage or current to be measured it not known, always start
Hook-up
Upper Tilt
Device
Big Lower
Tilt Device

5
with the highest range.
4. If meter indication is in the lower half of the scale and falls within the
range of a lower scale, reset selector switch to the lower range for
greatest accuracy.
5. If the meter won’t work at all, check the fuse located on the PCB. If it’s
blown, replace it. (See fuse replacement.)
6. Avoid placing the meter where extreme shock or continuous vibration
is encountered and do not store in excessively hot or damp places.
Although very rugged, the meter is a sensitive measuring device and
should be handled carefully & properly.
7. Do not check resistance, transistor, diode, LED, or capacitance when
live voltage or current input across the circuit.
8. When the meter is not in use, keep the selector switch to the “OFF”
range position, this provides direct short across meter movement for
minimum needle bounce when transporting meter.
9. If you should accidentally apply excessive voltage or current on a
certain range, disconnect the leads from the circuit as quickly as
possible, check instrument operation on that range by applying peoper
input. If the meter does not operate properly, check fuse. If it is blown
replace it. (See fuse replacement.)
OPERATION PROCEDURES
DC Voltage Measurement
WARNING: USE EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HIGH VOLTAGE. DO NOT TOUCH
TERMINAL OR PROBE ENDS.
1. Set the selector switch to the appropriate DCV range to be used.
2. Connect the BLACK test lead to the “-COM” jack and the RED test lead
to the “+” jack.
3. If you know the polarity of the circuit to be tested, connect the black
probe to the negative side.
4. If you don’t know the polarity, connect the probes to opposite sides of the
circuit and watch the pointer. If it goes to the left, reverse the probes. The
RED probe will be connected to the positive.
5. Check the needle position and the get the reading on V.A scale.
Null DCV (Central Zero) Measurement
At these two ranges, it can automatically judge the polarity of circuit as the
pointer can move to the center line and become a Null meter.
1. Set the selector switch to the DCV ±5V or 25V range.
2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to
the Red “+” jack.
3. Set the Zero Ω adjustor to place the pointer exactly to the Central Zero
position if need.

6
4. Connect the test leads across the circuit or load under measurement.
5. Take the readings on the Red dial Null DCV scale.
NOTE: If the needle failed to be set at Central Zero position, the power of 9V
battery may be weak and should be replaced by new one for normal
working.
AC Voltage Measurement
WARNING: USE EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HIGH VOLTAGE. DO NOT TOUCH
TERMINAL OR PROBE ENDS!
1. Set the selector switch to the appropriate ACV range to be used and
connect the test leads across the circuit or load under measurement.
(Polarity of the test probes is unimportant on ACV test.)
2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to
the“+” jack.
3. Check the needle position and the get the reading on V.A scale.
DC Current Measurement
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE RANGE SWITCH IS IN CURRENT POSITION.
DO NOT ATTEMPT TO MEASURE AC CURRENT.
1. Set the selector switch to the appropriate DC mA range to be used and
connect the test leads in series with the circuit or the load under
measurement. If the pointer deflects to the left, reverse the probes.
2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to
the Red “+” jack for Current at/less than 0.25A. For large current max.
10A, move the red test lead to the Red “10A” jack.
3. Check the needle position and the get the reading on V.A scale.
NOTE:Excessive current input across mA range will blow the fuse that must
be replaced by a same fuse rating 0.5A/250V or 10A/250V. The maximum
testing time once must be not more than 15sec. and pause 5min. for next
time at big current load.
The maximum terminal voltage drop is 250mV except for the 10A range.
NOTE: If connected incorrectly with the voltage at these ranges, quickly
remove the test leads from the circuit as to avoid damage to this tester.
(This tester can afford the voltage <250V DC/AC rms. for the period of 5
seconds max.)

7
Resistance Measurement
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.
1. Set the selector switch to the appropriate Ωrange to be used.
2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to
the Red “+” jack.
3. Short the leads by touching the probes together. Pointer should read zero
at the right hand end of the upper most scale, if it doesn’t, use the Ohm
adjust knob on the right hand of the panel to line up the pointer with zero.
(If pointer can’t be brought to zero, replace battery.)
4. Connect the test leads across the resistance to be measured.
5. Take reading on the top “Ω” scale and multiply it by the multiplication
factor indicated by the selector switch.
6. If there is little or no pointer movement from the left side of the scale,
reset the selector switch to higher range. The effective reading scope on
an Ohm meter scale is within the area of between 25 degree of Arc left
side to the Midscale and 25 degree right side to the Midscale.
NOTE: If connected incorrectly with the voltage, this tester can be
automatically restored to the normal working within 1 minute after taking off
the test leads or the voltage load from the tester without any damage. (This
tester can afford the voltage <250V DC/AC rms. for the period of 30 seconds
max.)
Diode Measurement
1. Set the selector switch to the appropriate Ωrange to be used.
NOTE: To test the diode while current below 0.060 mA at X 10K range;
current below 0.15 mA at X 1K range; current below 1.5 mA at X 100
range; current below 15 mA at X 10 range; current below 150 mA at X 1
range.
2. For IF (forward current) test, put the BLACK test lead to the “-COM”
jack and the RED test lead to the Red “+” jack. And then connect the
Black probe to the Positive terminal of the Diode, the Red probe to the
Negative terminal of the Diode.
For IR (reverse current) test, reverse the connection.
3. Read the value IF or IR of the diode on the LI scale.
4. Read the linear (forward voltage) VF of the diode on the LV scale.
Continuity Test
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE RANGE SWITCH IS IN OHM POSITION.
Set the selector switch to the BUZZ range. Connect the test leads to two
points of circuit. If the resistance is lower than 200 Ohm approx., the Beeper
sounds.
NOTE: Battery voltage is sufficient for Buzzer operation as long as the Zero
Ohm pointer can be adjusted to the Zero scale place.

8
NOTE: If connected incorrectly with the voltage, quickly remove the test
leads from the circuit as to avoid damage to this tester..
(This tester can afford the voltage <250V DC/AC rms. for the period of 5
seconds max.)
Transistor hFE and LED Test
1. Set the selector switch to the R X 10 range.
FOR Measuring Transistor hFE
2. Take note the type of transistor “PNP” or “NPN” and then insert the
transistor terminals of the Emitter, Base and Collector separately into the
proper holes of the socket on the front panel.
3. Read the approximate hFE Value directly at the hFE scale.
NOTE: Current 10μA. VCE 2.8V.
4. When the Base terminal cut, the value of Leak is Iceo for Transistor.
FOR Measuring LED: Insert the transistor terminals directly into the “+”
and “-” holes of the socket on the front panel.
And then check if the LED under testing is lighting.
Battery Check
1. This meter comes with two separate battery check ranges to test either
DC 1.5V or 9V batteries.
2. Set the selector switch to the appropriate BATT range to be used.
3. Connect the BLACK test lead to the “-COM” jack and the RED test lead to
the Red “+” jack.
4. Connect the Red test lead to the positive end of battery and the Black one
to the negative end of the battery to be measured.
5. Take reading on the “BATT” scale and check it good or bad as per which
portion indicated.
(Note: the mark section of “?” shows that the battery may be starting to
decay.)
NOTE: If connected incorrectly with the voltage, quickly remove the test
leads from the circuit and can avoid the damage to this tester.
(This tester can afford the voltage <250V DC/AC rms. for the period of 5
seconds max.)
Decibels Measurement
1. Set the selector switch to AC 10V range.
2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to
the Red “+” jack.
3. Connect the test leads to the measuring circuit specially in series with a
0.047μF/400V Metalized Polyester Capacitor. And then read the bottom
Red dB scale.
4. For more dB scope, change the selector switch to the others of ACV
ranges and make the same actions. Add the appropriate number of dB
scale reading as noted on the chart below.
NOTE: For absolute dB measurements, circuit impedance must be 600 Ohm.
0 dB = 1mw dissipated in a 600 Ohm impedance (equivalent to 0.755V

9
across 600 Ohm)
ACV RANGE
ADD dB Number
50
14
250
28
1000
40
Capacitance Measurement
WARNING: DO NOT APPLY VOLTAGE TO MEASURING TERMINAL
WHILE MAKING ANY CAPACITANCE MEASUREMENTS.
BEFORE TESTING ANY CAPACITORS, DISCHARGE THE CAPACITOR
COMPLETELY.
1) Set the selector switch to the C (R X1K) range.
2) Connect the BLACK test lead to the “-COM” jack and the RED test
lead to the Red “+” jack.
3) Connect the test leads to the capacitor to be measured (Note the
polarity of capacitor).
4) Watch the needle deflection to the right topside, and read the Red
C2000uF scale on the Dial.
TROUBLESHOOTING
Nevertheless, problems or malfunctions may occur.
For this reason, the following is a description of how you can eliminate
possible malfunctions yourself:
Error
Possible cause
The multimeter does not
work.
Are the batteries exhausted?
Check the state of the batteries and the
fuse 0.5A.
No measurements
possible via V/mA
socket.
Is the fuse defective? Check the fuse 0.5A
(fuse replacement)
No measurements
possible via 10A socket.
Is the fuse defective? Check the fuse 10A
(fuse replacement)
No change in measured
values.
Have you selected the right measuring
sockets? Is the measuring range/mode
correct (AC/DC)?
Faulty measuring results
are displayed.
Has null balancing of the display or a 0
Ohm calibration for the resistance
measurement been carried out? Is the
batteries not properly assembled in?
MAINTENANCE
Replacement for Battery and/or Fuse should only be done
after the test leads have been disconnected and POWER OFF.

10
1. Battery Replacement
- 1.5V Battery (Pls. see the Picture below for reference)
1) This tester uses 2pcs AAA size 1.5V batteries which are located under the
lower battery cover together with the big tilt device on the lower part of the
rear case.
2) Note the condition of the batteries using the procedure described above, if
the battery needs to be replaced, turn the lock by 180°degree and take
off the cover of the battery cabinet together with the big tilt device on the
rear case.
3) Remove the spent batteries and replace them with a battery of the same
type. Observing polarity as indicated battery polarity marking on the
bottom of the battery compartments.
4) Replace the battery cover and turn the lock by 180°degree again to
tighten the battery cover.
- 9V Battery (Pls. see the Picture below for reference)
1) This tester uses One 9V battery which is located under the upper battery
cover together with the tilt-Hookup device on the upper part of the rear
case.
2) Note the condition of the battery using the procedure described above, if
the battery needs to be replaced, remove the screw and open the upper
cover of the battery cabinet on the rear case.
3) Take off the spent 9V battery and replace them with a battery of the same
type. Observing polarity as indicated battery polarity marking on the
bottom of the battery compartment.
4) Replace the battery cabinet cover and tighten the screw.
2. Fuse Replacement(Pls. see the Picture below for reference)
1) When the fuse needs replacement, use only UL-Listed 0.5A/250V fuse or
10A/250V fuse identical in physical size to the original type Φ5 x 20 mm.
2) Open the big lower tilt device on the rear case and then turn the lock by
180°degree and take off the cover of the battery cabinet together with
the big tilt device.
3) The old fuses inside their holders located on the PCB can be visible and
access to be removed. Then take off the melt fuses and install the new
fuses into their original places.
The 0.5A/250V fuse is at the left side and 10A/250V fuse at the right side.
4) Replace the battery cover and turn the lock by 180°degree
again to tighten the lower battery cover.
NOTE: 2pcs stand-by fuses are provided and located beside the batteries
under the lower battery cover with rating marked below the fuses.

11
Lock for lower 1.5V
Battery Cover
Lower 1.5V Battery Cabinet
inside and Fuses Layout
Screw
Hole
9V Battery

12
MT-2017N指針型防誤測三用電錶
操作使用說明書
特點：
本機是指針式，防誤測全保護，斜立型三用電錶(附晶體 LED 座，短路蜂鳴及
10A 檔，及鍍金表筆)。具有以下基本特點和參數如下：
- 斜立型，兩個可調後蓋支撐架。上部支架可拉出後,向上轉動 90 度, 壓下可固
定； 並附帶掛鈎設計（支撐架向上轉動 180 度伸出後蓋，以便懸掛）。下部
大支撐架可拉出以更大角度斜立。
- 後蓋下部特別設置了 1.5V 電池倉和用鎖扣固定的電池蓋，以非常方便用戶拆
卸和更換電池及保險管。
- 配置玻璃釺維環氧樹脂鍍金盤雙面電路板，日系電池，通過 CE 認證。
- 檔位切換簧片採用彈簧寶石軸承及二極體雙向限幅電路
- 具有全面的防誤測超載保護電路及速斷型保險絲多重保護
- 電阻檔位特別配置自恢復保險管可在誤載移除後自行恢復工作
- 具有緊湊的兩側軟性防滑減振保護套
- 可測直流電壓和中間零位正負直流電壓，直流電流（最大 10A），交流電壓，
電阻，電晶體，二極體，LED，電池，短路蜂鳴, 和電容(2000uF Max.) 等.
- 輸入阻抗：DC20Kohm /V，AC 9Kohm/V
- 直流電壓：0.1/2.5/10/50/250/1000V 六檔
- 中間零位正負直流電壓：±5V/25V 兩檔
- 直流電流：50μA/2.5m/25m/250mA/10A 五檔
- 交流電壓：10/50/250/1000V 四檔
- 電阻：1/10/100/1K/10K 五檔
- 電池：1.5/9V 二檔
- 電容：C（RX1K）， Max. 2,000 uF;
- 標準環境條件：23C5C, 濕度< 75% RH。
- 工作環境範圍：0C ~ 40C, 濕度< 90% RH。
- 儲存條件：-10C ~ 50C, 濕度< 80% RH。
- 電錶外形尺寸：171（長）x 108（寬）x 37（高）mm
- 電錶重量：370 克（包括電池）

13
規格表：
測試功能
檔位
準確度
說明
直流電壓 DCV
0-0.1-2.5-10-50-25
0-1000V
±3%FSD(滿刻度)
±4%FSD(1000V 檔)
輸入阻抗：20KΩ/V
超載：Max 1000V
但在 0.1V/2.5V/10V 各
檔，250V Max.
正負直流電壓
Null DCV
DC ±5V/±25V
±5% FSD.(滿刻度)
輸入阻抗：40KΩ/V;
超載：Max.250V
交流電壓 ACV
0-10-50-250V-100
0V
±4%FSD(滿刻度)
±5%FSD(1000V 檔)
頻率範圍：40~10KHz
輸入阻抗：9KΩ/V
超載：Max.1000V
但10V/50V 檔，250V
Max.
直流電流 DCA
0-0.05-2.5-25-250
mA, 10A
±3%FSD(滿刻度)
±4%FSD(10A 檔 )
壓降：250mV
超載保護：0.5A/250V
保險絲管；在 10A 檔，
超載保護：F10A/250V,
大電流測試時間最多 15
秒。
電阻 Ω
X1:0.2~2KΩ
(中值：20Ω)
X10:2~20KΩ
(中值：200Ω)
X100:20~200KΩ
(中值：2000Ω)
X1K:200~2MΩ
(中值：20KΩ)
X10K:2K~20MΩ
(中值：200KΩ)
±4%ofARC(弧長)
誤載：最高 AC/DC250V，
最大測試時間 30 秒。
自恢復保險管保護，當
误載移除後約 1分鐘內
自行恢復正常工作，無
需更換保險管。
電容
Capacitance
C：2,000uF 最大
值
參考值
使用 Rx1K 檔
電池測量
BATT Check
0~1.5V:GOOD
-?-BAD
0~9V:GOOD-?-B
AD
參考值
負載電流：270mA(1.5V
電池)，25mA(9V 電池)
超載：最高 AC/DV250V，
超載最大測試時間 5秒。
三極管檢測
hFE: 0-1000
參考值
使用 Ω×10 檔
LED,
二極管檢測
參考值
使用 Ω×10 檔

14
通斷測試
200 歐姆左右以
內，蜂鳴器會
響。
超載：最高 AC/DC
250V，超載最大測試時
間5秒。
內部電源
1.5VAAA 電池：2節，
6F22.9V 矩形電池：1節
指針防誤測斜立型三用電錶指針閱讀參考表
測試
Test
量程檔位
Range Position
指標刻度讀數
Scale to read
倍數
Multiplied
電阻(歐姆)
Resistance(Ω)
×1
×10
×100
×1K
×10K
Ω
×1
×10
×100
×1000
×10000
直流電壓
(伏特)
DC Volt(V)
DC 0.1V
2.5V
10V
50V
250V
1000V
10
250
10
50
250
10
×0.01
×0.01
×1
×1
×1
×100
正負直流電壓(伏特)
Null DC Volt(V)
DC ±5V
±25V
-5-0-+5
-25-0-+25
×1
×1
直流電流
(安培)
DC Current（A）
DC 50μA
2.5mA
25mA
250mA
10A
50
250
250
250
10
×1
×0.01
×0.1
×1
×1
交流電壓
(伏特)
AC Volt(V)
AC 10V
50V
250V
1000V
10V
50
250
10
×1
×1
×1
×100
hFE
Ω×10
IC/IB
×1
二極體 Diode
Ω×10K
×1K
×100
×10
×1
μA×1
μA×10
μA×100
mA×1
mA×10

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測量注意事項：
1. 指針調零
調整零位調整器，使指針和左側的零位對齊，不必每次測量前都調，但是
在開始測量之前，指標都必須確認指標在零位上。
2. 測試棒的連接
紅色棒插“+”插孔，黑色棒插入“-COM”插孔。
3. 電錶內部電池檢查
將表棒按以上規定方式接入好，再將檔位旋鈕轉到 Rx10 檔位。然後，將
表棒的兩端短路連接。這時，檢查指針是否正常回歸零位。若不能，則電
池電力不足，應要更換新電池。
4. 量程的選擇
選擇測量檔位時，旋鈕上的“三角形”記號對準規定的適當量程。
測量工作方式：
1. 直流電壓：
用於測量電池、放大器電路、通訊設備電源、電子管和電晶體電路偏 壓的
直流電壓。6個檔位元中的每一個檔位元標記，分別表示該檔的最大電壓示
值。
(※不確定之直流電壓，應從最大值依序向下調整量測)
2. 中值零位正負直流電壓：（不可測量任何交流電壓！）
本功能專用檢測電子電路的正負電平。通過表棒接入電路，可直接查看刻度
讀數。
注意：在此檔位時，可用歐姆電調零將指針設置在中間位置。若無法調到中
值零位，則有可能是 9V 電池電量不足。請檢查電池。
3. 交流電壓：
用於測量商業交流電壓、交流電源電路、交流放大信號級等。4個檔位元中
的每一個檔位元標記，分別表示該檔的最大電壓示值.(※不確定之交流電
壓，應從最大值依序向下調整量測)
4. 直流電流：（不可測量任何交流電流或電壓！）
用於測量直流電源控制裝置的電流消耗、電晶體電路的工作電流等。5個檔
位元中的每一個檔位元標記，分別表示該檔的最大電流示值。
(※不確定之直流電流，應從最大值依序向下調整量測)
注意：當在 10A 檔測試大電流時，單次測試時間不能超過 15 秒。
而且兩次測試間隔時間不少於 5分鐘。
本機具有防誤測保護電路。可短時（5秒內）承受低於 AC/DC 250V 的電壓
衝擊，僅爆保險絲。
5. 電阻：(※此功能不能測試帶電壓電路)
測量電阻值和測試線路和線路間的連通性。5個檔中的每一個檔位元標記，
分別表示該檔乘數。(K 即X1000)
注意：本機在電阻檔具有防誤測保護自恢复保险管。可短時（30 秒內）承

16
受低於 AC/DC 250V 的電壓衝擊。移除误载後約 1分鐘内自行恢復正
常工作，無需更換保險管。
6. 連通性測試(Buzz) (※此功能不能測試帶電壓電路)
將量程選擇旋鈕置於 Buzz 檔，當被測電路<200ohm, 蜂鳴器鳴叫。
注意：本機在檔位元具有防誤測保護電路。可短時（5秒內）承受低於 AC/DC
250V 的電壓衝擊，僅爆保險絲。
7. 電池測試：（※電池能用於小的晶體管收音機，但不能用作裝的電源。）
好電池：指針停留在綠色(GOOD)範圍內。電量不足：指針停在“？”尚可
使用範圍內。
壞電池：指標停在紅色(BAD)區域。
注意：本機在檔位元具有防誤測保護電路。可短時（5秒內）承受低於 AC/DC
250V 的電壓衝擊，僅爆保險絲。
8. dB 測試：
本機測量 dB 值時，要接入表棒並串接一個 0.047μF/400V 電解電容，然後檢
視電錶讀數。
測量在 10V 檔上進行，可直接讀取 dB 刻度(-10dB~+22dB)。
測量在 50V 檔上進行時，刻度讀值要加 14dB，才是實際 dB 值。
測量在 250V 檔上進行時，刻度讀值要加 28dB。
測量在 1000V 檔上進行時，刻度讀值要加 40dB。
例如，在 1000V 檔上最大可測 dB 值是 22+40=62dB。
9. hFE(直流放大倍數)和發光二極體(LED)測試：
將量程選擇旋鈕置於“OHM”檔上之 X10 檔
hFE 測試：
(1) 調節 0 Ω 調整器使指針和零位對齊-將電晶體的三個管腳直接插入面
板上的 hFE 端座。
(※注意區分電晶體的類別“PNP”和“NPN”)
(2) 在hFE 刻度讀出顯示值，所讀之值是 IC/IB，即被測體的直流放大倍數。
LED 測試：
(1) 將LED 的兩個腳按正負極性直接插入面板上的 LED 的“+”，“-”兩
個端座。
(2) 檢查 LED 是否正常發光。
10. 二極體測試：
(1) 將量程選擇旋鈕置於“Ω”檔上有選擇的量程位置，X10K 用於
0~60μ A 測試，X1K 用於 0~150μ A，X100 用於 0~1.5m A，X10 於
0~15mA，X1 用於 0~150mA 測試。
(2) 將電錶與二極體連接測 IF(正向電流)，將電錶的“COM”端與二極體
陽極相連，“+”端與二極體陰極相連，對於 IR(反向電流)測試連接方
法和 IF 相反。
(3) 在LI 刻度線讀出 IF 或IR
(4) 在測試 IF 或IR 同時在LV 刻度上，讀出二極體正向(反向)電壓。

17
11. 電容測試：
注意：檢測前，須將電容放電並將電錶調零。(※此功能不能測試帶電壓
電路)
a.將電錶量程選擇旋鈕置於“Ωx1k”檔。
b.用表棒連接電容，並注意“+”，“-”極性。
c.觀察指標偏轉最大時，電錶刻度板上紅色 C刻度。
常見問題故障及處理
若用戶在使用中，發現本機出現一些普通常見問題故障，可參照下表自行進行
分析處理：
問題和故障
原因和處置
指針無反
應，不動
表棒是否接觸良好？ 內部保險管是否燒斷？
內部電池是否正確裝好，並接觸到位？
（參閱有關電池和保險管更換說明）
指針指示異
常
檔位量程是否選擇正確？交流和直流模式是否使用正確？
內部電池是否電量不足？（參閱有關電錶內部電池檢查說
明）
指針無法正
常歸零位
內部電池是否接觸良好？是否電量不足？（參閱有關電錶
內部電池檢查說明）
內部機芯處的遊絲是否並圈？可試用力將本機甩動幾下或
在手中拍擊幾下後，看是否恢復正常。
DC10A 檔不
能工作
表棒是否接觸良好，正確接入？
內部 10A 保險管是否裝好或燒斷？
（參閱有關保險管更換說明）
日常維修
維修更換電錶內部電池和保險絲管時，必須將表棒從電錶上移調，並
切斷電源。
1). 1.5V 電池更換：(參閱下圖)
打開電錶後面的下部大支撐架，將下部的電池倉後蓋的鎖扣旋轉 180度，
既可將電池倉後蓋連支撐架卸下，然後從電池座中拿出不好的電池。再將
新的同規格電池放入原位，並注意電池的正負極性。然後，蓋上後蓋並將
鎖扣旋轉 180度而鎖住。
2). 9V 電池更換：(參閱下圖)
打開電錶的上部電池倉後蓋，從電池座中拿出不好的電池。再將新的同規
格電池放入原位，並注意電池的正負極性，然後，蓋上後蓋並擰緊螺釘。
3). 保險絲管更換：(參閱下圖)
打開電錶後面的下部大支撐架，將下部的電池倉後蓋的鎖扣旋轉 180度，
既可將電池倉後蓋連支撐架卸下。 即可看到電路板上的兩個並列保險管
(左邊的為 0.5A/250V, 右邊為 10A/250V), 從保險絲座中拿出不好的保險絲
管。再將新保險絲管（0.5A/250V 或10A/250V，Φ5*20mm）換上。必須用

18
同規格 UL 認證的保險絲管。 然後，蓋上後蓋並將鎖扣旋轉 180度而鎖住。
（本電錶的下部電池倉的左右兩邊一般各設有 1個備用保險絲管）。
1.5V 電
池倉和保
險管位置
螺絲孔
9V 電池
位置
1.5V 電池
蓋鎖扣

19
MT-2017N指针型防误测三用电表
操作使用说明书
特点：
本机是指针式，防误测全保护，斜立型三用电表(附晶体 LED 座，短路蜂鸣及
10A 档，及镀金表笔)。具有以下基本特点和参数如下：
- 斜立型，两个可调后盖支撑架。上部支架可拉出后,向上转动 90 度, 压下可固
定； 并附带挂钩设计（支撑架向上转动 180 度伸出后盖，以便悬挂）。下部
大支撑架可拉出以更大角度斜立。
- 后盖下部特别设置了 1.5V 电池仓和用锁扣固定的电池盖，以非常方便用户拆
卸和更换电池及保险管。
- 配置玻璃钎维环氧树脂镀金盘双面电路板，日系电池，通过 CE 认证。
- 档位切换簧片采用弹簧宝石轴承及二极管双向限幅电路
- 具有全面的防误测超载保护电路及速断型保险丝多重保护
- 电阻文件位特别配置自恢复保险管可在误载移除后自行恢复工作
- 具有紧凑的两侧软性防滑减振保护套
- 可测直流电压和中间零位正负直流电压，直流电流（最大 10A），交流电压，
电阻，晶体管，二极管，LED，电池，短路蜂鸣, 和电容(2000uF Max.) 等.
- 输入阻抗：DC20Kohm /V，AC 9Kohm/V
- 直流电压：0.1/2.5/10/50/250/1000V 六档
- 中间零位正负直流电压：±5V/25V 两档
- 直流电流：50μA/2.5m/25m/250mA/10A 五档
- 交流电压：10/50/250/1000V 四档
- 电阻：1/10/100/1K/10K 五档
- 电池：1.5/9V 二档
- 电容：C（RX1K）， Max. 2,000 uF;
- 标准环境条件：23C5C, 湿度< 75% RH。
- 工作环境范围：0C ~ 40C, 湿度< 90% RH。
- 储存条件：-10C ~ 50C, 湿度< 80% RH。
- 电表外形尺寸：171（长）x 108（宽）x 37（高）mm
- 电表重量：370 克（包括电池）