Pro's Kit MT-2019 User manual

MT-2019
Protective Function Analog Multimeter
User’s Manual
1st Edition,2019
© 2019Copyright 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, DC Current, Resistance and Diode, LED,
Transistor, Decibels, Continuity Buzzer and Capacitance with very high
sensitive quality movement, and good-designed circuit, as well as colorful
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
Accessories
One set of Test Leads; One Spare Fuse:
0.5A/250V
Size
160(W) x 105(D)x 40(H) mm
Weight
390g approx. (including batteries 3pcs)

2
Test
Functions
Range
Accuracy
Remarks
DCV
0-0.1-2.5-10-50-
250V -1000V
3% FSD.
4% FSD.
For 1000V
Input Impendence:
20KΩ/V
Overload Protection:
Max. 1000V AC/DC
BUT at 0.1/2.5/10V,,
250V Max.
ACV
0-10-50-250V
-1000V
4% FSD.
5% FSD.
for 1000V
Input Impendence:
9KΩ/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-
250 mA,
3% FSD.
Drop Voltage: 250mV
Overload protected by
Fuses 0.5A/250V, and
Oxide Varactor. <250V
AC/DC(5s).
Ω
X1: 0.2 ~ 2KΩ
midscale at 20Ω
X10: 2~20KΩ
Midscale at 200Ω
X100:20~200KΩ
Midscale at
2000Ω
X1K: 200~ 2MΩ
Midscale at 20KΩ
X10K: 2K ~
20MΩ Midscale
at 200KΩ
4% of ARC
of Scale
Length
Overload protected by
the Oxide Varactor &
Fuse <250V AC/DC(5s).
Capacitance
(uF)
2000uF
Approximate
Value
Use the ΩX 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).
Continuity
Check
Beeper sounding
under 200 Ohm
Overload protected by
Fuse & voltage
Suppressor <250V
AC/DC(5s).

3
Transistor
Check
hFE: 0-1000 via
special hFE
socket
Approximate
Value
At Ω X 10 Range
LED, Diode
Check
via special hFE
socket
Approximate
Value
At Ω X 10 Range
Decibel
-22 dB ~ + 62 dB
(0dB=1mW at
600Ω)
Approximate
Value
At ACV ranges
Power
Source
Internal Battery: R03, AAA, 1.5V 2pcs, 6F22, NEDA1604, 9V
1pc
CALIBRATION
ΩZero Adjustor located at the right side of the panel, adjusting the meter
pointer to the Zero mark on the right side of Ωscale 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.

4
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 ΩX1 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.
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.)

5
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.)
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

6
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 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 uppermost scale, if it doesn’t, use the 0
Ωadjust 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 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 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.
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.

7
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.)
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.
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.)

8
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.)
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 ΩX 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.
TROUBLESHOOTING
Nevertheless, problems or malfunctions may occur.
For this reason, the following is a description of how you can eliminate
possible malfunctions by yourself:

9
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 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 Ω
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.
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.

10
MT-2019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震保護套
- 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，線路導通蜂鳴和電容(2000uF Max.) 等.
- 輸入阻抗：DC20KΩ/V，AC 9KΩ/V
- 直流電壓：0.1/2.5/10/50/250/1000V 六檔
- 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
- 線路導通: 一檔
- 電容：C（ΩX1K）（ 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）
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-
250V -1000V
±3%FSD(滿刻度)
±4%FSD(1000V 檔)
輸入阻抗：20KΩ/V
超載：Max 1000V
但在 0.1/2.5 /10V 各檔，
250V Max.
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
0-0.05-2.5-25-250
mA
±3%FSD(滿刻度)
壓降：250mV
超載保護：F0.5A/250V

11
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。
電容
Capacitance
(μF)
2000uF
參考值
使用 ΩX1K 檔
電池測量
BATT Check
0~1.5V:GOOD
-?-BAD
0~9V:GOOD-?-BA
D
參考值
負載電流：270mA(1.5V
電池)，25mA(9V 電池)
超載：最高 AC/DV250V，
最低 DC/AC 50V，
超載最大測試時間 5秒。
導通檢測
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。
三極管檢測
hFE: 0-1000
參考值
使用 Ω X10 檔
LED, 二極管
檢測
參考值
使用 Ω X10 檔
內部電源
1.5V AAA 電池 2個
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
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)
X 1
X10
X100
X1K
X10K
Ω
×1
×10
×100
×1000
×10000
直流電壓(伏特)
DC Volt(V)
DC 0.1V
2.5V
10V
50V
250V
10
250
10
50
250
×0.01
×0.01
×1
×1
×1

12
1000V
10
×100
直流電流(安培)
DC Current（A）
DC 50μA
2.5mA
25mA
250mA
50
250
250
250
×1
×0.01
×0.1
×1
交流電壓(伏特)
AC Volt(V)
AC 10V
50V
250V
1000V
10V
50
250
10
×1
×1
×1
×100
三極體 hFE
ΩX10
IC/IB
×1
二極體 Diode
ΩX10K
X1K
X100
X10
X 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 ΩX10
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。7個檔位中的每一個檔位標記，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個檔位中的每
一個檔位標記，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
位中的每一個檔位標記，分別表示該檔的最大電流示值。

13
(※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。
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. 導通性測試(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. 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。
8. 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

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端座。
- 檢查 LED 是否正常發光。
9. 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。
- 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。
10. 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）。

15
MT-2019 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震保护套
- 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，线路导通蜂鸣和电容(2000uF Max.) 等.
- 输入阻抗：DC20KΩ/V，AC 9KΩ/V
- 直流电压：0.1/2.5/10/50/250/1000V 六檔
- 直流电流：50μA/2.5m/25m/250mA 四檔
- 交流电压：10/50/250/1000V 四檔
- 电阻：1/10/100/1K/10K 五檔
- 电池：1.5/9V 二檔
- 线路导通: 一檔
- 电容：C（ΩX1K）（ 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）
规格表：
测试功能
檔位
准确度
说明
直流电压
DCV
0-0.1-2.5-10-50-
250V -1000V
±3%FSD(满刻度)
±4%FSD(1000V 檔)
输入阻抗：20KΩ/V
超载：Max 1000V
但在 0.1/2.5 /10V 各檔，
250V Max.
交流电压
ACV
0-10-50-250V
-1000V
±4%FSD(满刻度)
±5%FSD(1000V 檔)
频率范围：40~10KHz
输入阻抗：9KΩ/V
超载：Max.1000V
但10V/50V 檔，250V Max.
直流电流
DCA
0-0.05-2.5-25-250
mA
±3%FSD(满刻度)
压降：250mV
超载保护：F0.5A/250V

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电阻 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(弧长)
超载：最高 AC/DC250V，
最低 DC/AC50V
超载最大测试时间 5秒。
电容
Capacitance
(μF)
2000uF
参考值
使用 ΩX1K 檔
电池测量
BATT Check
0~1.5V:GOOD
-?-BAD
0~9V:GOOD-?-BA
D
参考值
负载电流：270mA(1.5V
电池)，25mA(9V 电池)
超载：最高 AC/DV250V，
最低 DC/AC 50V，
超载最大测试时间 5秒。
导通检测
200 奥姆左右以
内，蜂鸣器会响。
超载：最高 AC/DC 250V，
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 檔
LED, 二极管
检测
参考值
使用 Ω X10 檔
内部电源
1.5V AAA 电池 2个
6F22. 9V 电池 1个
指针防误测斜立型三用电表指针阅读参考表
测试
Test
量程檔位
Range Position
指标刻度读数
Scale to read
倍数
Multiplied
电阻(奥姆)
Resistance(Ω)
X 1
X10
X100
X1K
X10K
Ω
×1
×10
×100
×1000
×10000
直流电压(伏特)
DC Volt(V)
DC 0.1V
2.5V
10V
50V
250V
10
250
10
50
250
×0.01
×0.01
×1
×1
×1

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1000V
10
×100
直流电流(安培)
DC Current（A）
DC 50μA
2.5mA
25mA
250mA
50
250
250
250
×1
×0.01
×0.1
×1
交流电压(伏特)
AC Volt(V)
AC 10V
50V
250V
1000V
10V
50
250
10
×1
×1
×1
×100
三极体 hFE
Ω X10
IC/IB
×1
二极管 Diode
Ω X10K
X1K
X100
X10
X 1
μA×1
μA×10
μA×100
mA×1
mA×10
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 ΩX10
檔位。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。
测量工作方式：
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个檔位中的每一个文件位标记，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个檔位中的每
一个文件位标记，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个檔
位中的每一个文件位标记，分别表示该文件的最大电流示值。

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(※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个文件中的每一个文件位标记，
分别表示该文件乘数。(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。
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：本机在文件位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. 导通性测试(Buzz) (※此功能不能测试带电压电路)：
将量程选择旋钮置于 Buzz 文件，当被测电路<200ohm, 蜂鸣器鸣叫。
注意：本机在文件位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。
7. 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。
8. 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 檔
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

19
端座。
- 检查 LED 是否正常发光。
9. 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。
- 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。
10. 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：
4) 将电表量程选择旋钮置于“Ω X1K”檔
5) 用表棒连接电容，并注意“+”，“-”极性。
6) 观察指标偏转最大时，电表刻度板上红色 C刻度。
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）。