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Manual MT 2018

The MT-2018 Protective Function Analog Multimeter is a versatile, battery-operated device designed for measuring DC/AC voltage, current, resistance, and more, featuring overload protection and a user-friendly design. It includes detailed specifications on safety categories, operating conditions, and measurement ranges, along with instructions for calibration and operation. The manual also provides troubleshooting tips for common issues, ensuring users can effectively utilize the multimeter for various applications.

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0% found this document useful (0 votes)
77 views28 pages

Manual MT 2018

The MT-2018 Protective Function Analog Multimeter is a versatile, battery-operated device designed for measuring DC/AC voltage, current, resistance, and more, featuring overload protection and a user-friendly design. It includes detailed specifications on safety categories, operating conditions, and measurement ranges, along with instructions for calibration and operation. The manual also provides troubleshooting tips for common issues, ensuring users can effectively utilize the multimeter for various applications.

Uploaded by

thanganh048810
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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MT-2018

Protective Function Analog Multimeter

User’s Manual
2st Edition, 2018
© 2018 Copyright by Prokit’s Industries Co., Ltd.
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, DC Current, Resistance and Diode, LED,
Transistor, Decibels, and Capacitance with very high sensitive
quality movement, and good-designed circuit, as well as mirrored
Aluminum dial plate etc. It has the perfect full overload &
miss-used protection via Fuses, Oxide Varactor & Diodes. It is an
ideal instrument for indoor use in the laboratory, school, workshop,
hobby and home applications.

SPECIFICATIONS
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; One Spare Fuse: 0.5A/250V,

1
Test
Range Accuracy Remarks
Functions
Input Impendence:
20KΩ/V
0-0.1-0.5-2.5-10-50  3% FSD. Overload Protection:
DC V -250 V  4% FSD. For Max. 1000V AC/DC
-1000V 1000V BUT 0.1V/0.5V/
2.5V/10V/50V /250V
Max.
Input Impendence:
9KΩ/V
 4% FSD. Overload Protection:
0-10-50-250V
AC V  5% FSD. For Max. 1000V AC/DC
-1000V
1000V But 10V/50V only
250V Max. Band
width: 40 ~10K Hz
Drop Voltage: 250mV
0-0.05-2.5-25- Overload protected by
 3% FSD.
DC mA 250 mA, Fuses 0.5A/250V, and
Oxide Varactor.
<250V AC/DC(5s).
X1: 0.2 ~ 2KΩ
midscale at 20Ω
X10: 2~20KΩ
Midscale at 200Ω Overload protected by
 4% of ARC of
X100:20~200KΩ the Oxide Varactor &
Ω Scale Length
Midscale at 2000Ω Fuse <250V
X1K: 200~ 2MΩ AC/DC(5s).
Midscale at 20KΩ
X10K: 2K ~ 20MΩ
Midscale at 200KΩ
Capacitan Approximate
2000uF Use the Ω X 1K range
ce (uF) Value
Load Current:
270mA for 1.5V,
0 ~ 1.5V: GOOD - ?
25mA for 9V.
BATT – BAD  5% of ARC of
Overload protected by
Check 0 ~ 9V: GOOD - ? – Scale Length
Fuse & Oxide
BAD
Varactor .<250V
AC/DC(5s).

2
Transistor hFE: 0-1000 via Approximate
At Ω X 10 Range
Check special hFE socket Value
LED,
via special hFE Approximate
Diode At Ω X 10 Range
socket Value
Check
-22 dB ~ + 62 dB
Approximate
Decibel (0dB=1mW at At ACV ranges
Value
600Ω)
Internal Battery:
Power R03, AAA, 1.5V
Source 2pcs, 6F22,
NEDA1604, 9V 1pc

CALIBRATION

Ω Zero Adjustor located at the right side of the panel, adjusting


the meter pointer to the Zero mark on the right side of Ω 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
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.

3
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, 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 Ω 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 wotk 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.

4
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 circuot 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.)

OPERATION PROCEDURES

DC Voltage Measurement
WARNING: WITH EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HUGH VOLTAGE, AND 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.

AC Voltage Measurement
WARNING: WITH EXTREME CARE WHEN MAKING
MEASUREMENTS FOR HUGH VOLTAGE, AND 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.)

5
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.
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.
Note: If connected incorrectly with the voltage at these
ranges, 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.)

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 Ω 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 uppermost scale, if it
doesn’t, use the 0 Ω 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.

6
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 Ω 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 the damage
to this tester. (This tester can afford the voltage <250V DC/AC
rms. for the period of 5 seconds max.)

Diode Measurement
Set the selector switch to the appropriate Ω 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.
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.
1. Read the value IF or IR of the diode on the LI scale.
2. Read the linear (forward voltage) VF of the diode on the LV
scale.

Transistor hFE and LED Test


Set the selector switch to the Ω X 10 range.
For Measuring Transistor hFE
1. 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.
1. Read the approximate hFE Value directly at the hFE scale.

7
Note: Current 10μA. VCE 2.8V.
2. 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 as to avoid the damage
to this tester.
(This tester can afford the voltage <250V DC/AC rms. for the
period of 5 seconds max.)

8
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 “Output” jack.
3. Connect the test leads to the measuring circuit, 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
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 Ω 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 C scale on the Dial.

9
TROUBLESHOOTING

Nevertheless, problems or malfunctions may occur.


For this reason, the following is a description of how you can
eliminate possible malfunctions by yourself:
Error Possible cause
The multimeter does not Are the batteries exhausted? Is
work. the power indicator lit? Check
the state of the batteries and the
fuse 0.5A.
No measurements possible Is the fuse defective? Check the
via V/mA socket. fuse 0.5A (fuse replacement)
No change in measured Have you selected the right
values. measuring sockets? Is the
measuring range/mode correct
(AC/DC)?
Faulty measuring results Has null balancing of the display
are displayed. or a 0 Ω calibration for the
resistance measurement been
carried out? Is the batteries not
properly assembled in?

10
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 identical in physical size to the original type
Φ5 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.

11
MT-2018 指針型防誤測電錶

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。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單面電路板,日系电池,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,直流電流(最大 250mA) ,交流電壓,電阻,電晶
體,二極體,LED,電池, 和電容(2000uF Max.) 等.
- 輸入阻抗:DC20KΩ/V,AC 9KΩ/V
- 直流電壓:0.1/0.5/2.5/10/50/250/1000V 七檔
- 直流電流:50μA/2.5m/25m/250mA 四檔
- 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(Ω X1K)(2000 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:160(長)x 105(寬)x 40(高)mm
- 電錶重量:390 克(包括電池)

12
規格表:
測試功能 檔位 準確度 說明
輸入阻抗:20KΩ/V
超載:Max 1000V
直流電壓 0-0.1-0.5-2.5-10-50 ±3%FSD(滿刻度)
但在 0.1V/0.5/2.5V
DCV -250-1000V ±4%FSD(1000V 檔)
/10V 各檔,250V
Max.
±4%FSD(滿刻度) 輸入阻抗:9KΩ/V
交流電壓 0-10-50-250V-1000 ±5%FSD(1000V 檔) 超載:Max.1000V
ACV V 頻率範圍: 但 10V/50V 檔,
40~10KHz 250V Max.
壓降:250mV
直流電流 0-0.05-2.5-25-250 ±3%FSD(滿刻度)
超載保護:
DCA mA,
F0.5A/250V
X1:0.2~2KΩ
(中值:20Ω)
X10:2~20KΩ 超載:最高
(中值:200Ω)
AC/DC250V,
X100:20~200KΩ
電阻 Ω ±4%ofARC(弧長) 最低 DC/AC50V
(中值:2KΩ)
超載最大測試時間
X1K:200~2MΩ
(中值:20KΩ) 5 秒。
X10K:2K~20MΩ
(中值:200KΩ)
電容
Capacitance 2000uF 參考值 使用 Ω X1K 檔
(μF)
負載電流:
270mA(1.5V 電池),
0~1.5V:GOOD 25mA(9V 電池)
電池測量 -?-BAD 超載:最高
參考值
BATT Check 0~9V:GOOD-?-BA AC/DV250V,
D 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 X10 檔
LED, Diode
參考值 使用 Ω X10 檔
Check

13
1.5V AAA 電池 2 個
內部電源
6F22. 9V 電池 1 個

指針防誤測斜立型三用電錶指針閱讀參考表
測試 量程檔位 指標刻度讀數 倍數
Test Range Position Scale to read Multiplied
X1 Ω ×1
X10 ×10
電阻(歐姆)
X100 ×100
Resistance(Ω)
X1K ×1000
X10K ×10000
DC 0.1V 10 ×0.01
0.5V 50 X 0.01
直流電壓 2.5V 250 ×0.01
(伏特) 10V 10 ×1
DC Volt(V) 50V 50 ×1
250V 250 ×1
1000V 10 ×100
DC 50μA 50 ×1
直流電流
2.5mA 250 ×0.01
(安培) DC
25mA 250 ×0.1
Current(A)
250mA 250 ×1
AC 10V 10V ×1
交流電壓
50V 50 ×1
(伏特)
250V 250 ×1
AC Volt(V)
1000V 10 ×100
hFE Ω X10 IC/IB ×1
Ω X10K μA×1
X1K μA×10
二極體 Diode
X100 μA×100
X10 mA×1
X1 mA×10

14
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 Ω X10 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:
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。7 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. 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)
3. 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。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
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。
4. 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。

15
5. 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。
6. dB 測試:
本機測量 dB 值時,要將紅色表棒插入專用“OUTPUT”插孔,黑色
表棒插入專用“-COM”插孔; 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。
7. 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“Ω”量程之 X10 檔
hFE 測試:
- 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”。
- 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:
- 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。
- 檢查 LED 是否正常發光。
8. 二極體測試:
- 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。
- 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。

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- 在 LI 刻度線讀出 IF 或 IR
- 在測試 IF 或 IR 同時在 LV 刻度上,讀出二極體正向(反向)電
壓。
9. 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)

電容檢測:
1) 將電錶量程選擇旋鈕置於“Ω X1K”檔
2) 用表棒連接電容,並注意“+”,“-”極性。
3) 觀察指標偏轉最大時,電錶刻度板上紅色 C 刻度。

日常保養
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. 電池更換:
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。

2. 保險絲管更換:
首先移去電錶兩側的軟性保護套,然後打開電錶的後蓋,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,Φ5*20mm)換上。必須用同規
格 UL 認證的保險絲管。然後,蓋上後蓋並套上保護套,最後
鎖緊後蓋螺釘。
(本電錶的電池倉後蓋下一般設有備用保險絲管)。

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MT-2018 指针型防误测电表
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。具


有以下基本特点和参数如下:

- 斜立型,可调后盖支撑架(拉出后,向上转动 90 度, 压下可固定) ;
附带挂钩设计(支撑架向上转动 180 度伸出后盖,以便悬挂)。
- 配置玻璃钎维环氧树脂镀金盘单面电路板,日系电池,并通过 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
- 具有紧凑的两侧软性防滑减振保护套
- 可测直流电压,直流电流(最大 250mA) ,交流电压,电阻,晶体
管,二极管,LED,电池, 和电容(2000uF Max.) 等.
- 输入阻抗:DC20KΩ/V,AC 9KΩ/V
- 直流电压:0.1/0.5/2.5/10/50/250/1000V 七档位
- 直流电流:50μA/2.5m/25m/250mA 四档位
- 交流电压:10/50/250/1000V 四档位
- 电 阻:1/10/100/1K/10K 五档位
- 电 池:1.5/9V 二档位
- 电 容:C(Ω X1K)(2000 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:160(长)x 105(宽)x 40(高)mm
- 电表重量:390 克(包括电池)

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规格表:
测试功能 档位 准确度 说明
输入阻抗:20KΩ/V
超载:Max 1000V
直流电压 0-0.1-0.5-2.5-10-5 ±3%FSD(满刻度)
但在 0.1V/0.5/2.5V
DCV 0-250-1000V ±4%FSD(1000V 檔)
/10V 各檔,250V
Max.
±4%FSD(满刻度) 输入阻抗:9KΩ/V
交流电压 0-10-50-250V-100 ±5%FSD(1000V 檔) 超载:Max.1000V
ACV 0V 频率范围: 但 10V/50V 檔,
40~10KHz 250V Max.
压降:250mV
直流电流 0-0.05-2.5-25-250
±3%FSD(满刻度) 超载保护:
DCA mA,
F0.5A/250V
X1:0.2~2KΩ
(中值:20Ω)
X10:2~20KΩ 超载:最高
(中值:200Ω)
AC/DC250V,
X100:20~200KΩ
电阻 Ω ±4%ofARC(弧长) 最低 DC/AC50V
(中值:2KΩ)
X1K:200~2MΩ 超载最大测试时间 5
(中值:20KΩ) 秒。
X10K:2K~20MΩ
(中值:200KΩ)
电容
Capacitance 2000uF(C) 参考值 使用 Ω X1K 档
(μF)
负载电流:
270mA(1.5V 电池),
0~1.5V:GOOD 25mA(9V 电池)
电池测量 -?-BAD 超载:最高
参考值
BATT Check 0~9V:GOOD-?-B AC/DV250V,
AD 最低 DC/AC 50V,
超载最大测试时间 5
秒。
三极管检测 hFE: 0-1000 参考值 使用 Ω X10 档
LED, Diode
参考值 使用 Ω X10 档
Check

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1.5V AAA 7 号电
池:2 节,
内部电源
6F22.9V 矩形电
池:1 节

指针防误测斜立型三用电表指针阅读参考表
测试 量程档位 指标刻度读数 倍数
Test Range Position Scale to read Multiplied
X1 Ω ×1
X10 ×10
电阻(欧姆)
X100 ×100
Resistance(Ω) X1K ×1000
X10K ×10000
DC 0.1V 10 ×0.01
0.5V 50 X 0.01
直流电压 2.5V 250 ×0.01
(伏特) 10V 10 ×1
DC Volt(V) 50V 50 ×1
250V 250 ×1
1000V 10 ×100
直流电流 DC 50μA 50 ×1
2.5mA 250 ×0.01
(安培) DC
25mA 250 ×0.1
Current(A) 250mA 250 ×1
AC 10V 10V ×1
交流电压
50V 50 ×1
(伏特) 250V 250 ×1
AC Volt(V) 1000V 10 ×100
hFE Ω X10 IC/IB ×1
Ω X10K μA×1
X1K μA×10
二极管 Diode X100 μA×100
X10 mA×1
X1 mA×10

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测量注意事项:
1. 指针调零
调整零位调整器,使指针和左侧的零位对齐,不必每次测量前都
调,但是在开始测量之前,指标都必须确认指标在零位上。
2. 测试棒的连接红色棒插“+”插孔,黑色棒插入“-COM”插孔。
3. 电表内部电池检查将表棒按以上规定方式接入好,再将档位旋钮
转到 Ω X10 档位。然后,将表棒的两端短路连接。这时,检查指
针是否正常回归零位。若不能,则电池电力不足,应要更换新电
池。
4. 量程的选择
选择测量档位时,旋钮上的“三角形”记号对准规定的适当量程。

测量工作程序:
1. 直流电压:
用于测量电池、放大器电路、通讯设备电源、电子管和晶体管电
路偏 压的直流电压。7 个档位元中的每一个档位元标记,分别表
示该文件的最大电压示值。
(※不确定之直流电压,应从最大值依序向下调整量测)
2. 交流电压:
用于测量商业交流电压、交流电源电路、交流放大信号级等。4
个档位元中的每一个档位元标记,分别表示该文件的最大电压示
值.(※不确定之交流电压,应从最大值依序向下调整量测)
3. 直流电流:(不可测量任何交流电流或电压! )
用于测量直流电源控制装置的电流消耗、晶体管电路的工作电流
等。4 个档位元中的每一个档位元标记,分别表示该文件的最大
电流示值。
(※不确定之直流电流,应从最大值依序向下调整量测)
注意:本机具有防误测保护电路。可短时(5 秒内)承受低于
AC/DC 250V 的电压冲击,仅爆保险丝。
4. 电阻:(※此功能不能测试带电压电路)
测量电阻值和测试线路和线路间的连通性。5 个文件中的每一个
档位元标记,分别表示该档位乘数。(K 即 x1000)
注意:本机在电阻文件具有防误测保护电路。可短时(5 秒内)
承受低于 AC/DC 250V 的电压冲击,仅爆保险丝。

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5. 电池测试:
(※电池能用于小的晶体管收音机,但不能用作装的电源。 )
好电池:指针停留在绿色(GOOD)范围内。电量不足:指针停在“?”
尚可使用范围内。
坏电池:指针停在红色(BAD)区域。
注意:本机在档位元具有防误测保护电路。可短时(5 秒内)承受
低于 AC/DC 250V 的电压冲击,仅爆保险丝。
6. dB 测试:
本机测量 dB 值时,要将红色表棒插入专用“OUTPUT”插孔,黑色
表棒插入专用“-COM”插孔; 然后检视电表读数。
测量在 10V 档上进行,可直接读取 dB 刻度(-10dB~+22dB)。
测量在 50V 档上进行时,刻度读值要加 14dB,才是实际 dB 值。
测量在 250V 档上进行时,刻度读值要加 28dB。
测量在 1000V 档上进行时,刻度读值要加 40dB。
例如,在 1000V 档上最大可测 dB 值是 22+40=62dB。
7. hFE(直流放大倍数)和发光二极管(LED)测试:
将量程选择旋钮置于“Ω”量程之 X10 档;
hFE 测试:
- 调节 0 Ω 调整器使指针和零位对齐-将晶体管的三个管脚直接插
入面板上的 hFE 端座。
(※注意区分晶体管的类别“PNP”和“NPN”。
- 在 hFE 刻度读出显示值,所读之值是 IC/IB,即被测体的直流放
大倍数。
LED 测试:
- 将 LED 的两个脚按正负极性直接插入面板上的 LED 的“+”,“-”
两个端座。
- 检查 LED 是否正常发光。
8. 二极管测试:
- 将量程选择旋钮置于“Ω”档上有选择的量程位置,X10K 用于
0~60μ A 测试,X1K 用于 0~150μ A,X100 用于 0~1.5m A,X10
于 0~15mA,X1 用于 0~150mA 测试。
- 将电表与二极管连接测 IF(正向电流),将电表的“COM”端与二极
管阳极相连,“+”端与二极管阴极相连,对于 IR(反向电流)测试
连接方法和 IF 相反。

22
- 在 LI 刻度线读出 IF 或 IR
- 在测试 IF 或 IR 同时在 LV 刻度上,读出二极管正向(反向)电压。
9. 电容测试:
注意:检测前,须将电容放电并将电表调零。(※此功能不能测试
带电压电路)
电容检测:
1) 将电表量程选择旋钮置于“Ω X1K”档。
2) 用表棒连接电容,并注意“+”,“-”极性。
3) 观察指标偏转最大时,电表刻度板上红色 C 刻度。

23
日常保养

更换电表内部电池和保险丝管时,必须将表棒从电表上移调,并切
断电源。

1). 电池更换:
打开电表的上部电池仓后盖,从电池座中拿出不好的电池。再
将新的同规格电池放入原位,并注意电池的正负极性,然后,
盖上后盖并拧紧螺钉。

2). 保险丝管更换:
首先移去电表两侧的软性保护套,然后打开电表的后盖,从保
险丝座中拿出不好的保险丝管。
再将新保险丝管(0.5A/250V,Φ5*20mm)换上。必须用同规
格 UL 认证的保险丝管。然后,盖上后盖并套上保护套,最后锁
紧后盖螺钉。
(本电表的电池仓后盖下一般设有备用保险丝管)。

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中国地区产品保固卡
购买日期 店章
公司名称
联络电话
电子邮箱
联络地址

产品型号 □ MT-2018-C

※ 在正常使用情况下,自原购买日起 12 个月免费维修保证(不含
耗材、消耗品)。
※ 产品保固卡需盖上店章、日期章,其保固效力始生效。
※ 本卡请妥善保存,如需维修服务时,请出示本卡以为证明。
※ 保固期满后,属调整、保养或是维修性质之服务,则酌收检修
工时费用。若有零件需更换,则零件费另计。
产品保固说明
 保固期限内,如有下列情况者,维修中心则得酌收材料成本或修
理费(由本公司维修人员判定):
• 对产品表面的损伤,包括外壳裂缝或刮痕
• 因误用、疏忽、不当安装或测试,未经授权打开产品修理,
修改产品或者任何其它超出预期使用范围的原因所造成的
损害
• 因事故、火灾、电力变化、其它危害,或自然灾难所造成
的损害。
 非服务保证内容:
• 机件本体外之消耗品:如电池...等消耗品
• 机件本体之外之附配件:如测试表棒等附配件。
 超过保证期限之检修或服务,虽未更换零件,将依公司保固维修
政策酌收服务费。

25
制造商 :宝工实业股份有限公司
地 址 :台湾新北市新店区民权路 130 巷 7 号 5 楼
电 话 :886-2-22183233
E-mail :pk@mail.prokits.com.tw

销售/生产商 :上海宝工工具有限公司
地址 :上海市浦东新区康桥东路 1365 弄 25 号
原产地 :中国.上海
服务热线 :021-68183050

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寶工實業股份有限公司
PROKIT’S INDUSTRIES CO., LTD
http://www.prokits.com.tw
Email: pk@mail.prokits.com.tw
© 2018 Prokit’s Industries Co., LTD. All rights reserved 2018001(C)

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