ProsKit MT-1233C User manual

MT-1233C/MT-1233D
3-1/2 Digital Multimeter
User’s Manual
1st Edition,2013
©2013 Copyright by Prokit’s Industries Co., Ltd.
1

INTRODUCTION
Warning
To avoid electric shock or personal injury, read
"Safety Information" and is Warning and
Precautions" before using the Meter
Safety information
This series meter Comply with IEC 1010-1 CAT I
600V / CAT II 300V overvoltage standards. See
specifications
Use the Meter only as specified in this manual,
otherwise the protection provided by the Meter
may be impaired.
In this manual a Warming identifies conditions
and actions that pose hazards to the user.
A caution identifies conditions and actions that
may damage the meter ort he equipment under
test
International symbols used on the Meter and in
this manual are explained Table
2

Table 1. International Electrical Symbols
AC (Alternating Current)
DC (Direct Current)
AC or DC
Battery
Safety information* Refer to the manual
Earth ground
Fuse
Conforms to European Union directive
Double insulated
WARNING AND PRECAUTIONS
To avoid possible electric shock or personal injury,
and to avoid possible damage to the meter or to the
equipment under test, comply with the following
practices:
Do not use the meter if it is damaged. Before you
use the meter, inspect the case. Pay particular
attention to the insulation surrounding the
connectors.
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Inspect the test leads for damaged insulation or

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Do not use the meter if it operates abnormally.
Protection may be impaired. When in doubt, have
the meter serviced.
Do not operate the meter around explosive gas,
vapor, or dust.
Do not apply more than the rated voltage, as
marked on the meter between terminals or
between any terminal and earth ground.
Before use, verify the meter's operation by
measuring a known voltage.
When measuring current, turn off circuit power
before connecting the meter in the circuit.
When servicing the meter, use only specified
replacement parts. Do not use the Meter in a
manner not specified by this manual or the safety
features of the meter may be impaired.
Use with caution when working above 30V ac rms,
42V ac peak, or 60V dc. Such voltages pose a
shock hazard.
When using the probes, keep your fingers behind
the finger guards on the probes.
Connect the common test lead before you
connect the live test lead. When you disconnect
test leads, disconnect the live test lead first.
Remove the test leads from the meter before you
open the battery door. Do not operate the meter

with the battery door or portions of the cover
removed or loosened.
To avoid false readings, which could lead to
possible
Safety Compliance: IEC 61010-1, 2000 CAT I
600V overvoltage standards Do not measure
voltages above 500V in Category installations
Overvoltage installations categories per IEC
61010-1, 2000: The meter is designed to protect
against transients in these categories:
CAT I From high-voltage low-energy sources,
e.g., electric circuits or a copy machine
CAT II From equipment supplied from the fixed
installation, e.g., TVs, PCs, portable tools
and household appliances
CAT III From equipment in fixed equipment
installations, e.g. installation panels,
feeders and short branch circuits, and
lighting systems in large buildings.
General specifications
Maximum Voltage between any Terminal and
Earth Ground: 1000V
Measurement rata: updates 2-3/sec.
Over range indication: "1' figure only in the display
Automatic negative polarity indication.
The is displayed when the battery voltage
drops below the operating voltage
operating temperature: 0℃～40℃, 0-75% RH.
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Storage temperature: -10℃～50℃, 0-75% RH.
Power: Single standard 1.5V battery AAAx2
Dimensions: 130L*72W*28H mm
Weight approx: 130g (not including battery)
FRONT PANEL DESCRIPTION
1. LCD Display
2. DATA HOLD button
3. BACK LIGHT button
4. FUNCTION AND RANGE SWITCH
This switch is used to select the function and
desired range as well as to turn on the instrument.
To extend the life of this battery, the switch should
be in the "OFF" position when the instrument is
not in use.
5. “VΩmA" JACK
6. "10A" JACK
7. "COM" JACK
SPECIFICATIONS
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Accuracies are guaranteed for 1 year, 23℃±5 ℃,
less than 80%RH

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DC VOLTAGE
Range Resolution Accuracy
200mV 100uV
2000mV 1mV
20V 10mV
200V 100mV
±0.8%+3d
500V 1V ±(1.0%+3d)
OVERLOAD PROTECTION: 220V rms AC for
200mV range and 500V DC or 500V rms for all
ranges.
AC VOLTAGE
Range Resolution Accuracy
200V 100mV
500V 1V ±1.2%+5d
RESPONSE: Average responding, calibrated in rms
of a sine wave.
FREQUENCY RANGE: 40Hz ～400Hz
OVERLOAD PROTECTION: 500V DC or 500V rms
for all ranges.

DC CURRENT
Range Resolution Accuracy
2000uA 1 uA
20mA 10 uA
200mA 100 uA
±(1.2%+5d)
10A 10mA ±(2.5%+5d)
OVERLOAD PROTECTION: 200mA 250V fuse (10A
range unused).
MEASURING VOLTAGE DROP: 200mV
AUDIBLE CONTINUITY
RANGE DESCRIPTION
Built-in buzzer sounds if resistance
is less then 30±20Ω
OVERLOAD PROTECTION: 5 second maximum
220V rms.
WARNING: DO NOT input any voltage at this
range for safety!
SQUARE-WAVE OUTPUT (MT-1233D Only)
RANGE DESCRIPTION
The output of about 50Hz square
wave test signal
WARNING: DO NOT input any voltage at this
range for safety!
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RESISTANCE
Range Resolution MT-1233C MT-1233D
200Ω0.1Ω±(1.5%+5d)
2000Ω1Ω
20kΩ10Ω
200kΩ100Ω
±(1.0%+3d)
20MΩ10KΩ±(1.0%+5d)
200MΩ100KΩ- ±[1.0%(rdg
-l0)+10d]
MAXIMUM OPEN CIRCUIT VOLTAGE: 2.3V.
OVERLOAD PROTECTION: 5 seconds maximum
220Vrms.
WARNING: DO NOT input any voltage at
resistance range for safety!
TEMPERATURE (MT-1233C only)
RANGE RESOLUTION ACCURACY
-40℃~150℃±(1.0%+3d)
150℃~1000℃
1℃
±(1.5%+15d)
-40℉~302℉±(1.0%+4d)
302℉~1832℉1℉±(1.5%+15d)
WARNING: DO NOT input any voltage at this
range for safety!
9

OPERATING INSTRUCTIONS
WARNING
To avoid electrical shock hazard and/or damage
of the Instrument, do not measure voltages that
might exceed 600V above earth ground.
Before the use of instrument, inspect test leads,
connectors and probes for cracks, breaks, cracks
in the insulation.
Dangerous voltages may be present at the input
terminals and may not be displayed.
To avoid electrical shock or damage to the meter
when measuring resistance or continuity in a
circuit, make sure the power to the circuit is
turned off and all capacitors are discharged.
DC & AC VOLTAGE MEASUREMENT
1. Connect red test lead to "VΩmA" jack, Black lead
to "COM" jack.
2. Set RANGE switch to desired VOLTAGE position,
if the voltage to be measured is not known before
hand, set switch to the highest range and reduce
it until satisfactory reading is obtained.
3. Connect test leads to device or circuit being
measured.
4. Turn on power of the device or circuit being
measured voltage value will appear on Digital
Display along with the voltage polarity.
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DC CURRENT MEASUREMENT
1. Red lead lo "VΩmA". Black lead to "COM”(for
measurements between 200mA and 10A connect
red lead to "10A” jack with fully depressed.)
2. RANGE switch to desired DCA position.
3. Open the circuit to be measured and connected
test leads INSERIES with the load in with current
is to measure.
4. Read current value on Digital Display.
5. Additionally,"10A"function is designed for
intermittent use only. Maximum contact time of
the test leads with the circuit is 15 seconds with a
minimum intermission time of seconds between
tests.
RESISTANCE MEASUREMENT
1. Red lead to "VΩmA". Black lead to "COM".
2. RANGE switch to desired OHM position.
3. If the resistance being measured is connected to
a circuit, turn off power and discharge all
capacitors before measurement.
4. Connect test leads LO circuit being measured.
5. Read resistance value on Digital Display.
DIODE MEASUREMENT
1. Red lead to "VΩmA", Black lead to "COM".
2. RANGE switch to " ' position.
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3. Connect the red test lead to the anode! of the
diode to be measured and black test lead to
cathode.
4. The forward voltage drop in mV will be displayed.
If the diode is reversed, figure "1" will be shown.
TEMPERATURE MEASUREMENT
(MT-1233C only)
1. Connect the K type thermoelectric couple to
"VΩmA" and "COM" jacks.
2. RANGE switch to TEMP position.
3. The display will read Temperature value ℃
AUDIBLE CONTINUITY TEST
1. Red lead to "VΩmA", Black lead to "COM".
2. RANGE switch to “ ”position.
3. Connect test leads to two points of circuit to be
tested. If the resistance is lower than 30Ω±20Ω,
the buzzer will sound.
TEST SIGNAL USE (MT-1233D only)
1. RANGE switch to " ”position.
2. A test signal (50Hz) appears between "VΩmA"
and "COM” jack, the output voltage is approx 3V
p-p with about 50KΩimpedance.
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MAINTENANCE
Beyond replacing batteries and fuses, do not
attempt to repair or service your Meter unless you
are qualified to do so and have the relevant
calibration, performance test and service
instruments. The recommended calibration cycle is
12 months.
To clean the terminals
a) Push the Meter OFF and remove test leads.
b) Shake out any dirt that may be in the terminals.
c) Soak a new swab with isopropyl and work around
the inside of each input terminal
d) Use a new swab to apply a light coat of fine
machine oil to the inside of each terminal.
FUSES TEST
Warning
To avoid electric shock or injury, remove the test
leads and any input signals before replacing the
fuses
1. Turn the rotary switch to 200mA position.
2. Use a multimeter to measure resistance of
"VΩmA" terminal or 10A terminal to COM
terminal.
A good mA terminal or 10A terminal fuse is
indicated by a reading between 0Ωand 10Ω.
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If the display is overloaded, replace the fuse and

If the display shows any other value, have the meter
serviced. See "Service and Parts" later in this
manual.
BATTERY AND FUSE REPLACEMENT
1) Battery and fuse replacement should only be
done after the test leads have been disconnected
and power is off.
2) Loosen screws with suitable screwdriver and
remove case bottom.
3) The meter is powered by 1.5V battery (AAAx2).
Snap the battery connector leads to the terminals
of a new battery and reinsert the battery into the
case top. Dress the battery leads so that they will
not be pinched between the case bottom and
case top.
4) The meter is protected by fast action fuse
0.2mA/250V, dimensions is ￠5*20mm.
5) Replace the case bottom and reinstall the three
screws, never operate the meter unless the case
bottom is fully dosed.
ACCESSORIES
User’s manual
Set of test leads(CAT I 600V work)
K type thermoelectric couple (MT-1233C only)
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SERVICE AND PARTS
If the Meter fails, check the batteries and fuses first,
and then review this manual to make sure that you
are operating the Meter correctly

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一、 概述
MT-1233C/D 儀錶是—種功能齊全，性能穩定，結構新
穎，安全可靠的小型掌上型 3 1/2 位元數位萬用表，可
用於測量交直流電壓、直流電流、電阻、二極體正向
壓降，有些還可以測量溫度和線路通斷，是廣大用戶
隨身攜帶的理想維修工具。本使用說明書包括有關的
安全資訊和警告提示等，請仔細閱讀有關內容，並嚴
格遵守所有的警告和注意事項。
二、 裝箱部件
1．使用說明書 1本
2．測試錶棒 1副
3．溫度探頭（僅限於MT-1233C） 1個
三、 安全操作準則
請注意“警告標識及警告字句＂。警告表示對使用者
構成危險。對儀錶或被測設備可能造成損壞的情況或
行動。MT-1233C/D 系列儀錶嚴格遵循電子測量儀器安
全要求以及安全標準 IEC61010 進行設計和生產，符合
雙重絕緣、過電壓標準(CAT I 600V、CAT II 300V)和污
染等級 2 的安全標準。請遵循手冊的使用說明使用儀
錶，否則儀錶所提供的保護功能可能會削弱或失去。

1．使用前應檢查錶棒絕緣層應完好，無破損及斷線。
如發現錶棒線或儀錶殼體的絕緣已明顯損壞，或者
您認為儀錶已無法正常工作，請勿再使用儀錶。
2．在使用錶棒時，必須始終確保您的手指放在錶棒手
指保護環之後。
3．不要在儀錶終端及按地之間施加 500V 以上的電
壓，以防電擊和損壞儀錶。
4．被測電壓高於直流 60V 和交流 42V rms 的場合，應
小心謹慎，防止電擊危險。
5．儀錶後蓋沒有蓋好前，嚴禁使用儀錶，否則有電擊
的危險。
6．被測信號不允許超過規定的極限值，以防電擊和損
壞儀錶。
7．嚴禁量程開關在測量中改變檔位，以防損壞儀錶。
8．不允許使用 10A 測試端子或用電流檔去測量電壓。
9．必須用同類標稱規格快速熔斷保險絲更換已損壞的
保險絲，確保安全。
10．請勿隨意改變儀錶內部接線，以免損壞儀錶和危
及安全。
11．當液晶顯示器顯示“ ＂符號時，應及時更換
電池，以確保測量準確度。
12．不要在高溫，高濕和強電磁場環境中使用儀錶，
尤其不要在潮濕環境中存放儀錶，受潮後的儀
錶，其性能可能變差。
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13．維護保養請使用濕布和溫和的清潔劑清潔儀錶外
殼，不要使用研磨劑或溶劑。
四、 電氣符號
電量
不足 警告 接地
AC
(交流） DC
(直流) 保險絲
雙重絕
緣 蜂鳴器 二極體
AC 或
DC
五、 綜合指標
電壓輸入端子和地之間的最高電壓：500Vrms
10A 端子：無保險絲
mA 端子：F200mA/250V 保險絲
量程選擇：手動
背光功能：手動點亮，延時熄滅
最大顯示：1999，每秒約更新 3 次
極性顯示；自動顯示，負極性顯示“-＂符號
過量程顯示：“1＂
資料保持功能：液晶顯示幕顯示“H＂符號
電池電量不足：液晶屏顯示“ ＂符號
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儀錶內使用電池：l.5V AAA x2

工作溫度：0℃~40℃ （32℉~104℉）
儲存溫度：-10℃~50℃C （14℉~122℉）
外形尺寸：約為 130L*72W*28/H 毫米
重量：約重 130 克（不包括電池）
六、外表結構
1．液晶顯示屏
2．數據保持開關
3．背光按鍵開關
4．量程旋鈕
5．電壓,電流,電阻,
溫度測量輸入端
6．10A 電流輸入端
7．公共輸入端
七、按鍵功能
1．資料保持顯示：按下“HOLD＂鍵，儀錶液晶顯示
幕上保持顯示當前測量值，再次按鍵則取消此功
能。
2．背光控制：按下背光按鍵即可點亮液晶屏的背光
燈，點亮後約延時 10 秒左右即熄滅。
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八、 測量操作說明
1．直流電壓及交流電壓測量
a)將紅錶棒插入“VΩmA＂，黑錶棒插入“COM＂
插孔。
b)將功能量程開關置於直流電壓檔位，並將錶棒並
聯到待測電源或負載上。
c)從液晶顯示幕讀取測量結果。
注意：不要測量高於 500V 的電壓，雖然有可能讀
得讀數，但也可能會損壞內部電路及傷害到您。在測
量之前如不知被測量電壓值的範圍時，應將最程開關
置於最高量程檔，根據讀數需要逐步調低測量量程。
當液晶顯示幕只在高位顯示“1＂時，說明已超量程，
須調高最程。在每一個量程檔，儀錶的輸入阻抗均為
10MΩ，這種負載效應在測量高阻電路時會引起測量
誤差，如果被測電路阻抗≤10KΩ，誤差可以忽略（0.1%
或更低）。
2．直流電流測量
a)將紅錶棒插入“VΩmA＂或 l0A 插孔，黑錶棒插
入“COM＂插孔。
b)將功能量程開關置於直流電流檔位，並將錶棒串
聯到待測電源或電路中。
c)從顯示器上讀取測量結果。
注意：如果不知被測電流值的範圍時，應將量程開
關置於高量程檔，根據讀數需要，逐步調低。在 mA
輸入插孔，輸入超載會將內置保險絲熔斷，須及時予
以更換，保險絲尺寸為：Φ5×20mm，電氣規格 F200mA
/250V; 10A 輸入插孔，內部沒有設置保險絲，為了安
全使用，每次測最時間應≤10 秒，間隔時間≥15 分鐘。
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