MT-2207
Protective Multifunction Analog Multimeter
User’s Manual
1st Edition, 2023
©2023Copyright 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-2027 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: 23C5C, less than 75% RH.
Operating temperature: 0C to 40C, 32 F to 104 F
Storage temperature: -10 C to 50C, 14 F to 122F
Operating Humidity Scope: Less than 90% RH.
Storage Humidity Scope: less than 80% RH.
Dimensione: 179(L) x 118(W) x 50(H) mm
Weight: 400g approx. (not including test leads and batteries)
Accessories: One pair of test leads;
Spare Fuse: F0.5A 250V;F10A 250V, Φ5x20mm
Test
Functions
Range
Accuracy
Remarks
DC V
0-0.25-1-2.5-10-
50-250-500-
1000V(2500V)
3% FSD.
4% FSD for
1000V(2500V)
Input Impedance:
20KΩ/V, UP 50V
9KΩ/V; Overload
Protection:
0.25V/1V/2.5V/10V/50
V Range，250V Max.
250V/500V/1000V
Range, 1000V AC/DC
Max.
2500V Range, 2500V
AC/DC Max.
AC V
0-10-50-250V-
500V
-1000V(2500V)
4% FSD.
5% FSD for
1000V(2500V)
Input Impedance:
9KΩ/V
Overload Protection:
10V/50VRange, 250V
Max. Band width: 40
2
~10K Hz
1000V Range ,1000V
AC/DC Max.
2500V Range ,2500V
AC/DC Max.
DC mA
0-50uA-0.5mA-
5mA-50mA-
500mA(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
10sec. 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 by
the voltage Suppressor
& Fuse (3sec.)
Capacitance
(uF)
Cx1: 50uF
Cx10: 500uF
Cx100: 5000uF
Cx1K & Cx10K:
Approx. Value
Approx. Value
Overload protected by
the voltage Suppressor
& Fuse (3sec.)
BATT Check
0 -1.2V- 1.5V-
2.0V-3V-3.6V: BAD
(red)- ? –
GOOD(green)
5% of ARC of
Scale Length
Overload protected by
the voltage Suppressor
& Fuse (3sec.)
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
Approx. Value
At ACV ranges
3
(0dB=1mW at
600Ω)
Via Test Leads
Continuity
Check
Beeper sounding
under 50 Ohm
Overload protected by
the voltage Suppressor
& Fuse (3sec.)
Power Source
Internal Battery:
AAA, 1.5V 2pcs,
Name of part
1.Scale panel 2.Point zero adjust 3. hFE socket 4.Range switch
5.VΩmA input socket 6.COM input socket 7.10A input socket
8.2500V input socket 9.Resistance zero adjust
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.
(+) Jack: Plug-in connector at the lower right on the panel for Red, positive test
lead.
4
STAND & HOOK-UP
This meter can be used in any operating position. It has an oblique bracket and a
hook behind it. Users should choose according to their own needs. And it have
magnets on its back to absorb the suspension.
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 batteries. (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 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 “DC or AC
voltage” 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.)
5
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 measuring a voltage above 1000V, insert the red test lead into the “2500v”
jack.
4. If you know the polarity of the circuit to be tested, connect the black probe to
the negative side.
5. 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.
6. Check the needle position and the get the reading on V.A scale.
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. If measuring a voltage above 1000V, insert the red test lead into the “2500v”
jack.
4. Check the needle position and the get the reading on V.A scale.
Note: Measuring high voltage at 2500V range, should be wear rubber
insulated gloves on both hands and be in a dry insulated environment.
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.
6
2. Connect the BLACK test lead to the “-COM” jack and the RED test lead to the
Red “+” jack for Current at/less than 0.5A. 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 10sec. 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.)
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 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 3 seconds max.)
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
7
from the circuit as to avoid damage to this tester..
(This tester can afford the voltage <250V DC/AC rms. for the period of 3 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 E(Up) “+”
and C(Down) “-” holes of the socket on the front panel.
And then check if the LED under testing is lighting.
Diode Measurement
1. 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.
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 linear (forward voltage) VF of the diode on the LV scale.
Battery Check
1. This meter comes with two separate battery check ranges to test either DC
1.2V /2.0V /3.0V or 3.6V 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 3 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
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 across 600
Ohm)
ACV RANGE
ADD dB Number
50
14
250
28
500
34
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 X1/X10/X100/X1K/X10K(R
X10K/X1K/X100/X10/X1) 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)
9
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.
1. Battery Replacement
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, open the lower tilt device on the rear case and
then turn the screw and take off the cover of the battery cabinet together with
the 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 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 Φ5 x 20 mm.
2) Open the lower tilt device on the rear case and then turn the screw and take off
the cover of the battery cabinet together with the 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.
4) Replace the battery cabinet cover and tighten the screw.
NOTE: 2pcs stand-by fuses are provided and located beside the batteries under
the lower battery cover with rating marked below the fuses.
10
MT-2207 指針型防誤測三用電錶
操作使用說明書
特點：
本儀錶是指針式防誤測斜立型三用電錶(帶電晶體 LED 座，短路蜂鳴及 10A 檔)。具
有如下參數和基本特點：
- 斜立型，後蓋斜立支撐架，支架可拉出轉動約 90 度支撐斜立。
- 後蓋下部是 1.5V 電池倉，用 PH1 十字起子拆卸和更換電池及保險管。
- 檔位切換簧片採用彈簧軸承及二極體雙向限幅電路。
- 配置玻璃纖維環氧樹脂鍍金 雙面電路板。
- 具有防誤測超載保護電路，速熔保險絲保護。
- 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 10A），交流電壓，電阻，電晶體，二極體，LED，
電池，短路蜂鳴,和電容等.
- 輸入阻抗：DC≤50V,20Kohm /V; ＞50V, 9Kohm/V ；AC 9Kohm/V
- 直流電壓：0.25/1/2.5/10/50/250/500/1000V(2500V)八檔
- 直流電流：50μA/0.5m/5m/50m/500mA(10A)五檔
- 交流電壓：10/50/250/500/1000V(2500V)五檔
- 電 阻：X1/X10/X100/X1K/X10K 五檔
- 電 池：一檔
- 短路蜂鳴：一檔
- 電 容：Cx1(Rx10K)/ Cx10(Rx1K)/ Cx100(Rx100)/ Cx1k(Rx10)/ Cx10k(Rx1)
- 標準環境條件：23C5C, 濕度< 75% RH。
- 工作環境範圍：0C ~ 40C, 濕度< 90% RH。
- 儲存條件：-10C ~ 50C, 濕度< 80% RH。
- 保險絲管：mA 檔，0.5A 250V 速熔保險絲; 10A 檔，10A 250V 速熔保險絲
- 電池：2x1.5V AAA 電池
- 電錶外形尺寸：179（長）x 118（寬）x 50（高）mm
- 電錶重量：400 克（不包括電池和表筆）
規格表：
測試功能
檔位
準確度
說明
直流電壓
DCV
0-0.25V-1V-2.5V-
10V-50V-250V-
500V-
1000V(2500V)
±3%FSD(滿刻度)
±4%FSD(1000V/2500
V檔)
輸入阻抗：DC≤50V
20KΩ/V; ＞50V 9KΩ/V
超載：
0.25V/1V/2.5V/10V/50V 各
檔,250V Max.
250V/1000V 档, 1000V Max.
2500V 档, 2500V Max.
11
交流電壓
ACV
0-10V-50V-250V-
500V-
1000V(2500V)
±4%FSD(滿刻度)
±5%FSD(1000V/2500
V檔)
頻率範圍：
40~10KHz
輸入阻抗：9KΩ/V
超載：
10V/50V 各檔, 250V Max.
250V/500V/ 1000V 各檔,
1000V Max.
2500V 檔, 2500V Max.
直流電流
DCA
0-50μA -0.5mA- 5
mA-50 mA -
500mA(10A)
±3%FSD(滿刻度)
±4%FSD(10A 檔 )
壓降：250mV
超載保護：
mA 檔：F0.5A 250V 保險絲
10A 檔：F10A/250V 保險
絲, 大電流測試時間最多
10 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)
誤测：最高 AC/DC250V，
最大測試時間 3秒，僅爆
保險絲管。
電 容
Capacitance
Cx1: 50uF
Cx10: 500uF
Cx100: 5000uF
Cx1K: 參考
Cx10K: 參考
僅供參考
誤测：最高 AC/DC250V，
最大測試時間 3秒，僅爆
保險絲管。
電池測量
BATT Check
1.2V-2V-3V-3.6V:
GOOD 綠 -?-
BAD 紅
參考值
負載電阻：8-12Ω
誤测：最高 AC/DV250V，
誤测最大測試時間 3秒，
僅爆保險絲管。
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；測試座 C,E
插孔,上“+”極,下“-”極
通斷測試
50 歐姆左右以
內，蜂鳴器會
響。
誤测：最高 AC/DC250V，
最大測試時間 3秒，僅爆
保險絲管。
工作電源
1.5VAAA 電池: x2 節
12
指針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 0.25V
1 V
2.5V
10V
50V
250V
500V
1000V
2500V
250
10
250
10
50
250
50
10
250
×0.001
×0.1
×0.01
×1
×1
×1
×10
×100
×10
直流電流
(安培)
DC Current（A）
DC 50μA
0.5mA
5mA
50mA
500mA
10A
50
50
50
50
50
10
×1
×0.01
×0.1
×1
×10
×1
交流電壓
(伏特)
AC Volt(V)
AC 10V
50V
250V
500V
1000V
2500V
10
50
250
50
10
250
×1
×1
×1
×10
×100
×10
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
13
面板示意:
1.表盘 2.指针归零 3.hFE 测试插座 4.档位旋转开关 5.VΩmA 输入插座
6.COM 输入插座 7.10A 输入插座 8. 2500V 输入插座 9.电阻调零
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，檢查指針是否正常回歸零位，若不歸零，則電池電力不足，需更
換新電池。
4. 量程的選擇
選擇測量檔位時，旋鈕上的“●”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。每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，1000V 和
2500V 共用檔位，2500V 電壓測量紅色表筆需要插在 2500V 測量孔位測量。
(※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。每個檔位中的每一
14
個檔位標記，分別表示該檔的最大電壓示值，1000V 和2500V 共用檔位，2500V 電
壓測量紅色表筆需要插在 2500V 測量孔位測量.
(※不確定之交流電壓，應從最大值依序向下調整量測)
注意：使用 2500V 档测量高压时，必需双手戴橡胶绝缘手套，并处于干燥绝缘的
场地上才能测量。
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。每個檔位中
的每一個檔位標記，分別表示該檔的最大電流示值。
(※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 10 秒。
而且兩次測試間隔時間不少於 5分鐘。
本機電流檔位保險絲管超載保護，超載可能會熔斷保險絲管，mA 檔位測量超過
500mA 電流，會熔斷 F0.5A 250V 保險絲管，10A 檔位測量超過 10A電流，会熔斷
F10A 250V 保險絲管。
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標記，分別表
示該檔乘數。(K 即X1000)
注意：本機在此檔位誤測電壓可能會熔斷保險絲管。如不小心誤測熔斷，請更換
同規格保險絲管。
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<50ohm 左右, 蜂鳴器鳴叫。
注意：本機在此檔位誤測電壓可能會熔斷保險絲管。如不小心誤測熔斷，請更換
同規格保險絲管。
7. 電池測試：（一般電池正常電壓：AA 鎳氫/鎳鉻電池電壓 1.2V,AA 或AAA 電池電
壓1.5V;CR2032 紐扣電池電壓 3.0V,一般鋰電池電壓 3.6V。）
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：本機在此檔位誤測市電電壓可能會熔斷保險絲管。如不小心誤測熔斷，請
更換同規格保險絲管。
8. dB 測試（在交流電壓檔測量）：
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 500V 檔上進行時，刻度讀值要加 34dB。
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“電阻”檔之 X10 檔（hFE）
15
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 的兩腳按正負極性直接插入三極管插座的上（+）、下（-）兩個孔。
(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，電錶的“COM”端與二極體陽極相連，“+”端與二
極體陰極相連，測 IF(正向電流)，對於 IR(反向電流)測試連接方法和 IF 相
反。
(3) 在測試 IF 或IR 同時在LV 刻度上，讀出二極體正向(反向)電壓。
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“Ω 相應”檔位。
b.用表棒連接電容，並注意“+”，“-”極性。
c.觀察指標偏轉最大時，電錶刻度板上綠色 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。
DC 電流檔
不能工作
表棒是否接觸良好，正確接入？
內部保險管是否裝好或燒斷？
（參閱有關保險管更換說明）
16
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：
打開電錶後面下部支撐架，用 PH1 起子旋開螺絲，將電池倉後蓋連支撐架卸
下，然後從電池座中拿出舊的電池。再將新的同規格電池放入原位，並注意電
池的正負極性，然後蓋上後蓋並鎖住螺絲。
2).保險絲管更換：
打開電錶後面的下部支撐架，用 PH1 十字起子旋開螺絲，將電池倉後蓋連支撐
架卸下，即可看到裡面蓋子上的兩個並列備用保險管（F0.5A/250V
F10A/250V，Φ5*20mm）, 從保險絲座中拿出不好的保險絲管。再將新保險絲
管換上，必須用同規格 UL 認證的保險絲管， 然後，蓋上後蓋並鎖上螺
絲。
（本電錶的電池倉的右邊一般有 2個備用保險絲管）。
17
MT-2207 指针型防误测三用电表
操作使用说明书
特点：
本仪表是指针式防误测斜立型三用电表(带晶体 LED 座，短路蜂鸣及 10A 档)。具有
如下参数和基本特点：
- 斜立型，后盖斜立支撑架，支架可拉出转动约 90 度支撑斜立。
- 后盖下部是 1.5V 电池仓，用 PH1 十字起子拆卸和更换电池及保险管。
- 档位切换簧片采用弹簧轴承及二极管双向限幅电路。
- 配置玻璃纤维环氧树脂镀金 双面电路板。
- 具有防误测超载保护电路，速熔保险丝保护。
- 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 10A），交流电压，电阻，晶体管，二极管，LED，
电池，短路蜂鸣,和电容等.
- 输入阻抗：DC≤50V,20Kohm /V; ＞50V, 9Kohm/V ；AC 9Kohm/V
- 直流电压：0.25/1/2.5/10/50/250/500/1000V(2500V)八档
- 直流电流：50μA/0.5m/5m/50m/500mA(10A)五档
- 交流电压：10/50/250/500/1000V(2500V)五档
- 电 阻：X1/X10/X100/X1K/X10K 五档
- 电 池：一档
- 短路蜂鸣：一档
- 电 容：Cx1(Rx10K)/ Cx10(Rx1K)/ Cx100(Rx100)/ Cx1k(Rx10)/ Cx10k(Rx1)
- 标准环境条件：23C5C, 湿度< 75% RH。
- 工作环境范围：0C ~ 40C, 湿度< 90% RH。
- 储存条件：-10C ~ 50C, 湿度< 80% RH。
- 保险丝管：mA 档，0.5A 250V 速熔保险丝;10A 档，10A 250V 速熔保险丝
- 电池：2x1.5V AAA 电池
- 电表外形尺寸：179（长）x 118（宽）x 50（高）mm
- 电表重量：400 克（不包括电池和表笔）
规格表：
测试功能
档位
准确度
说明
直流电压 DCV
0.25V-1V-2.5V-
10V-50V-250V-
500V-
1000V(2500V)
±3%FSD(满刻度)
±4%FSD(1000V/
2500V 档)
输入阻抗：
DC≤50V 20KΩ/V; ＞50V
9KΩ/V
超载：
0.25V/1V/2.5V/10V/50V 各
档250V Max;
250V/1000V 档,1000V Max.
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2500V 档, 2500V Max.
交流电压 ACV
10V-50V-250V-
500V-
1000V(2500V)
±4%FSD(满刻度)
±5%FSD(1000V/2
500V 档)
频率范围：
40~10KHz
输入阻抗：9KΩ/V
超载：
10V/50V 档,250V Max;
250V/500V/ 1000V 各档，
1000V Max.
2500V 档, 2500V Max.
直流电流 DCA
50μA -0.5mA- 5
mA-50 mA -
500mA, 10A
±3%FSD(满刻度)
±4%FSD(10A 檔 )
压降：250mV
超载保护：
mA 档：F0.5A/250V 保险丝
10A 档：F10A/250V 保险
丝, 大电流测试时间最多
10 秒。
电阻 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% of ARC(弧
长)
误测：最高 AC/DC250V，
超载最大测试时间 3秒，
仅爆保险丝管。
电 容
Capacitance
C：最大值
Cx1: 50uF
Cx10: 500uF
Cx100: 5000uF
Cx1K: 参考
Cx10K: 参考
仅供参考
误测：最高 AC/DC250V，
超载最大测试时间 3秒，
仅爆保险丝管。
电池测量
BATT Check
1.2-2-3-3.6V:
GOOD 绿 -?-BAD 红
参考值
负载电阻：8-12Ω
误测：最高 AC/DV250V，
误测最大测试时间 3秒，
仅爆保险丝管。
三极管检测
hFE: 0-1000
参考值
使用 Ω×10 檔
LED,
二极管检测
参考值
使用 Ω×10 檔；测试座
C,E 插孔，上“+” 极，下
“-” 极
通断测试
50 欧姆左右以
内，蜂鸣器会响。
误测：最高 AC/DC 250V，
误测最大测试时间 3秒。
内部电源
1.5VAAA 电池：2节
19
指针斜立型三用电表指针阅读参考表
测试
Test
量程档位
Range Position
指标刻度读数
Scale to read
倍数
Multiplied
电阻(欧姆)
Resistance(Ω)
×1
×10
×100
×1K
×10K
Ω
×1
×10
×100
×1000
×10000
直流电压
(伏特)
DC Volt(V)
DC 0.25V
1 V
2.5V
10V
50V
250V
500V
1000V
2500V
250
10
250
10
50
250
50
10
250
×0.001
×0.1
×0.01
×1
×1
×1
×10
×100
×10
直流电流
(安培)
DC Current（A）
DC 50μA
0.5mA
5mA
50mA
500mA
10A
50
50
50
50
50
10
×1
×0.01
×0.1
×1
×10
×1
交流电压
(伏特)
AC Volt(V)
AC 10V
50V
250V
500V
1000V
2500V
10
50
250
50
10
250
×1
×1
×1
×10
×100
×10
hFE
Ω×10
IC/IB
×1
二极管 Diode
Ω×10K
×1K
×100
×10
×1
μA×1
μA×10
μA×100
mA×1
mA×10
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