Pro's Kit MT-2017 User manual

MT-2017
Protective Function Analog Multimeter
User’s Manual
1st Edition,2013
©2013 Copyright by Prokit’s Industries Co., Ltd.

1
INTRODUCTION
This Multi-meter is an accurate, safe, battery operated, rear
tilt-stand, easy to operate handheld instrument with robust
protective holster alongside and the adjustable back tilt device
with hook-up design. It can offer accurate, reliable measurement
of DC/AC Voltage, +/-DCV, DC Current, Resistance and Diode,
LED, Transistor, Decibels, Continuity test and Capacitance with
very high sensitive quality movement, double-sided glass-epoxy
PCB & good-designed circuit, as well as mirrored Aluminum dial
plate etc. It has the perfect full overload & mis-used protection via
two Fuses, Oxide Varactor & Diodes. It is an ideal instrument for
indoor use in the laboratory, school, workshop, hobby 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.
Temperature Ranges:
0C to 40C, 32 F to 104 F for operating condition.
-10 C to 50C, 14 F to 122F for storage condition.
Humidity Scope: Operating condition less than 90% RH.
Storage condition: less than 80% RH.
Size: 160(W) x 105(D) x 40(H) MM
Weight: 390g approx. (including batteries 3pcs)
Accessories: One set of Test Leads;
Two Spare Fuses: 0.5A/250V & 10A/250V,
Additional Option Accessory: MT-2007-C special for capacitance
measurements 1 set

2
Te s t
Functions Range Accuracy Remarks
DC V 0-0.1-2.5-10-50-
250 V-1000V
3% FSD.
4% FSD.
For 1000V
Input Impendence:
20K/V Overload
Protection: Max.
1000V AC/DC
BUT 0.1V/2.5V/10V
250V Max.
Null DCV ±-5V, ±25V 5% FSD.
Input Impedance: 40K/V
Overload 1000V Max.
AC V 0-10-50-250V
-1000V
4% FSD.
5% FSD.
For 1000V
Input Impendence:
9K/V Overload
Protection: Max.
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, and Oxide
Varactor.<250V AC/
DC(5s). Max. test time
1min. for 10A.
X 1: 0.2 ~ 2K
Midscale at 20
X 10: 2 ~ 20K
Midscale at
200
X 100: 20~
200KMidscale
at 2000
X1K: 200~ 2M
Midscale at 0K
X10K: 2K
~20MMidscale
at 200K
4% of
ARC of
Scale
Length
Overload protected by
the Oxide Varactor &
Fuse <250V AC/DC
(5s).

3
0.025-0.25-25uF
(C2)
3% FSD. Use the optional
Accessory Kit
(MT-2007-C)
Capacitan
ce (uF)
2000uF(C1) Approx.
Value
Use the R x 1K range
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 & Oxide
Varactor .<250V
AC/DC(5s).
Transistor
Check
hFE: 0-1000 via
special hFE
socket
Approx.
Value
At X 10 Range
LED,
Diode
Check
via special hFE
socket
Approx.
Value
At X 10 Range
Decibel -22 dB ~ + 62 dB
(0dB=1mW at
600)
Approx.
Value
At ACV ranges
Continuity
Check
Beeper sounding
under 200 Ohm
Overload protected by
Fuse & Oxide
Varactor .<250V
AC/DC(5s).
POWER
Source
Internal Battery:
R6P, AA, 1.5V
2pcs, 6F22,
NEDA1604, 9V
1pc
CALIBRATION
Ohms Zero Adjustor located at the right side of the panel,
adjusting 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 below the center of
the meter dial to set pointer to Zero mark at the left side of the

4
scale.
(-) Jack: Plug-in connector at the lower left on the panel for
Black, negative test lead.
(+) Jack: Plug-in connector at the lower right on the panel for
Red, positive test lead.
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 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

5
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
peoperly, check fuse. If it is blown replace it. (See fuse
replacement.)

6
OPERATION PROCEDURES
DC Voltage Measurement
WARNING: WITH EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HUGE 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 adjustor to place the pointer exactly to the
Central Zero position if need.
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.

7
AC Voltage Measurement
WARNING: WITH EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HUGE 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 max. testing time shall be not more than 1min.
for big current load.

8
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.)
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 range 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 “” 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, 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.)

9
Diode Measurement
1. Set the selector switch to the appropriate range 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.
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.)

10
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 10A. 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 can come 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.)

11
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 0.047F/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 across 600 Ohm)
ACV RANGE ADD dB Number
50 14
250 28
1000 40
Capacitance Measurement with the optional accessory kit of
Item no. MT- 2007-C
WARNING: DO NOT APPLY VOLTAGE TO MEASURING
TERMINAL WHILE MAKING ANY CAPACITANCE
MEASUREMENTS.
BEFORE TESTING ANY CAPACITORS, DISCHARGE THE
CAPACITOR COMPLETELY.
BEFORE MEASUREMENTS, PLEASE READ THE
INSTRUCTIONS OF MT- 2007-C CAREFULLY.

12
1. For Measuring the Capacitor over 25uF:
1) Set the selector switch to the R X 1K 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 C1 scale on the Dial.
2. For Measuring the little Capacitor less than 25uF:
1) Set the selector switch to the DC 50uA(C2) range.
2) Set the capacitance selector switch on the MT-2007-C to
the proper range.
3) Plug the BLACK wire terminal of the MT-2007-C to the
“-COM” jack and the RED wire terminal of the MT-2007-C
to the Red “+” jack.
4) Insert the capacitor to be measured directly into the Cx
Jacks on the MT-2007-C (Note the polarity of capacitor).
5) Set-On the Power switch on the MT-2007-C, and then the
LED lighting.
6) Read the A.V. C2(250uF) scale on the Dial and multiply it
as per the multiplication table shown below:
Capacitance RANGE Multiplication Factor
0.025uF X 0.0001
0.25uF X 0.001
25uF X 0.1
7) After measurement, turn-off the power switches either of
the MT-2007-C, or of the tester.

13
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? Is the
power indicator lit? 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?

14
MAINTENANCE
Replacement for Battery and/or Fuse should only be done
after the test leads have been disconnected and POWER OFF.
1. Battery Replacement
1). Note the condition of the batteries 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.
2). Take off 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.
3). Replace the battery cabinet cover and tighten the screw.
2. Fuse Replacement
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 5 x 20 mm.
2). Disassemble the side Holsters, and take off the screw, then
open the whole rear case. Remove the old fuse from its
holder; install the new fuse into it.
3). Replace the rear cover & Holsters, and tighten the screw.

15
MT-2017 26 檔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)。具有以下基本特點和參數如下：
- 斜立型，可調後蓋支撐架（拉出後,向上轉動 90 度, 壓下可固定）；
附帶掛鈎設計（支撐架向上轉動 180 度伸出後蓋，以便懸掛）。
- 配置玻璃釺維環氧樹脂鍍金盤雙面電路板，日系電池，並通過 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
- 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：50A/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：C1（RX1K）（2000 uF）; C2:0.025-0.25-25uF(3 檔)
- 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：160（長）x 105（寬）x 40（高）mm
- 電錶重量：390 克（包括電池）
- 電容測試選配附件 MT-2007-C（0.025/0.25/25uF 三檔）

16
規格表：
測試功能 檔位 準確度 說明
直流電壓
DCV 0-0.1-2.5-10-50-250-1 000V ±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-1000V ±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 0-0.05-2.5-25-250mA
,
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 1 分鐘。
電阻 Ω
X1:0.2~2KΩ
(中值：20Ω)
X10:2~20KΩ
(中值：200Ω)
X100: 20~200KΩ
(中值：2KΩ)
X1K:200~2MΩ
(中值：20KΩ)
X10K:2K~20MΩ
(中值：200KΩ)
±4%ofARC(弧長)
超載：最高
AC/DC250V，
最低 DC/AC50V
超載最大測試時間 5
秒。
0.025-0.25-25uF
±3%FSD(滿刻度) 須使用選配附件 MT-2007-C
電 容
Capacitance
(μF) C2：2000Uf(C1) 參考值 使用 Rx1K 檔
電池測量
BATT
Check
0~1.5V:GOOD
-?-BAD
0~9V:GOOD-?-BAD 參考值 負載電流：
270mA(1.5V 電池)，
25mA(9V 電池)

17
超載：最高
AC/DV250V，
最低 DC/AC 50V，
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,
Diode
Check 參考值 使用 Ω×10 檔
Continuity
Check 200 歐姆左右以內， 蜂鳴器會響。
超載：最高 AC/DC
250V，最低 DC/AC
50V 超載最大測試時
間 5 秒。
內部電源 1.5V5 號電池：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) DC ±5V ±25V -5-0-+5 -25-0-+25 ×1 ×1

18
Null DC
Volt(V)
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
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。
測量工作程式：
1. 直流電壓：

19
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：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。
6. 連通性測試(Buzz) (※此功能不能測試帶電壓電路)