Pro's Kit MT-3112 User manual

MT-3112
3 5/6 Smart True-RMS Flex Clamp Meter
User’s Manual
1st Edition,
©2016 Copyright by Prokit’s Industries Co., Ltd.

1
1.Statement
In accordance with the international copyright law, without permission or
written consent, any information contained in this manual shall not be duplicated
in any form. This manual is subject to change in its future versions without further
notice.
1.1 Safety Notices
Caution
The sign “Caution” indicates any state or operation that may cause damages to the
instrument or device.
It requires the operation to be performed with due caution. If the operation is not
correctly performed, or the steps of the operation are not followed, the instrument or
device may be damaged. Unless these conditions are satisfied or fully understood, no
related operation as indicated in the sign “Caution” shall be done.
Warning
The sign “Warning” indicates any state or operation that may cause dangers to the
user.
It requires the operation to be performed with due caution. If the operation is not
correctly performed, or the steps of the operation are not followed, bodily injuries or
deaths may arise. Unless these conditions are satisfied or fully understood, no related
operation as indicated in the sign “Warning” shall be done.
Before using the instrument, Please read this manual carefully and pay
attention to the relevant safety warning information.
2.Safety Information
The instrument is designed according to the safety requirements of the international
safety standards EN61010-1, EN61010-2-032 and EN61326-1 regarding the electronic
testing instruments. It is designed and made in strict accordance with the EN61010-1,
EN61010-2-032, EN61326-1,CAT IV 600V over voltage safety standard and class of
pollution 2.

2
3.Safety Operation Specification
Warning: To avoid such possible safety accidents as electric shock
or bodily injury, please strictly observe the following guidelines:
Prior to the use of the instrument, please carefully read the manual, and pay special
attention to the related safety warning information herein. The instrument shall be
used in stringent conformity to the instructions contained herein, or else the
protection function supplied by the instrument may be impaired or damaged.
Prior to the use of the instrument, please check the outer casing for crack or the
plastic parts for damage; check the insulating layer for damage; check whether or
not there is any exposed metal or sign of wear; and check the connectivity. If any
defect is detected, the instrument shall not be used any more.
Prior to the use of the instrument, please check the insulating layer of the flexible
clamp for damage; if any, do not use it any longer;
Prior to the use of the instrument, please measure a given voltage with the
instrument, to confirm whether or not it is in good condition;
Please use the instrument according to the measurement type and rated value of
voltage or current as indicated on the instrument or in the manual.
Please observe the local and national safety rules. Wear the personal protective
equipment (such as the rubber gloves, face masks, flame-retardant clothes etc
approved), to avoid injuries caused by electric shock or electric arc due to the
exposed dangerous live conductors.
The voltage applied between the input terminals or between any terminal and the
ground point shall not exceed the rated value as indicated on the instrument.
Measure with due caution a voltage going beyond 30V (AC true effective value),
42V (AC peak value) or 60V (DC). The voltage of this kind may cause the danger of
electric shock.
When the low battery power is indicated on the instrument, the battery shall be
promptly replaced, to avoid measuring errors.
Never use the instrument in an environment containing explosive gas or vapor
around or a wet environment.
When using the pen, please hold it with fingers at the back of the probe finger
protection device.

3
To make measurement, connect the zero line or ground line, and then the firing line;
to finish measurement, disconnect the firing line, and then the zero line and ground
line.
Before opening the outer casing or battery cover, remove the pen from the
instrument. Never use the instrument with the instrument disassembled or the
battery cover opened.
To meet the requirements of the safety standards, the instrument shall be used with
the pen supplied. If the pen is damaged, it shall be replaced with one of the same
type and the same electrical specification.
4.Electrical Symbols
High voltage warning
AC (Alternating current)
DC (Direct current)
AC or DC
Warning, important safety signs
Ground
Equipment with double insulation or reinforced insulation
protection
Low battery
Conform with European Union standard
It shows that do not discard this electrical/electronic
product into household garbage.
CAT III
1000V
CAT III measurement is applicable for testing and
measuring circuits connecting to the distribution section
of building low voltage power supply.

4
CAT IV
600V
CAT IV measurement is applicable for testing and
measuring circuits connecting to the distribution section
of building low voltage power supply.
5.Overview
This instrument is a smart digital flexible clamp meter. It can be used for measuring
the direct voltage, alternating voltage, alternating current, frequency, resistance and
connectivity. Besides, it may identify the measured signals automatically, without the
need for the user to choose the measuring function.
6.Panel Description
①flexible clamp, used for
measuring alternating current
②flexible clamp bonnet lock
③main display
④auxiliary display
⑤backlight button
⑥illuminating lamp button
⑦power on-off button
⑧data hold button
⑨COM input jack
⑪V input jack
7.Instrument operation
This instrument is a smart digital flexible clamp meter. So its operation is very simple.
Its working dispenses with the need for function selection. It can identify the measured
signals, take measurements, and display the measuring results automatically.
Power on/off
Power on: with the device in the off state, press the button, and keep it pressed,
until the buzzer produces the sound “di”.

5
Power off: with the device in the on state, press the button, and keep it pressed,
until the buzzer produces the sound “di”.
Auto Shut-down Function
If no button is pressed, and no signal is input, the device will turn off automatically
within five minutes.
Backlight Function
Press the button to turn on the backlight; press the button again to turn off the
backlight.
Illumination Function
Press the button to turn on the illumination lamp; press the button again to
turn off the illumination lamp.
Data Hold Function
Press the button to enable the data hold function, with the symbol “H” shown
on the display; press the button again to disable the function.
AC/DC Voltage/ Resistance Measurement/ Connectivity
1）Press the power button to turn on the device;
2）Insert the red pen into the V jack, and the black pen into the COM jack;
3）Connect the pens in parallel to the circuit, power source or resistance to be
measured. The device detects AC voltage, DC voltage or resistance automatically;
4）When the resistance is measured, if the resistance is smaller than about 50Ω, the
built-in buzzer will make a sound;
5）The measuring results are read from the display. When the DC voltage is measured,
the display will also show the voltage polarity of the test point of the red pen;
6）When the AC voltage is measured, the frequency will also be shown on the auxiliary
display;
7）At the end of measurement, press the power button to turn off the device.
Note:
The device’s automatic detection order:
AC voltage DC voltage AC current Resistance and connectivity
Warning: To avoid such possible safety accidents as electric shock or bodily injury,
please strictly observe the safety work guidelines.

6
AC Current Measurement
1）Press the power button to turn on the device;
2）Release the flexible clamp bonnet lock, allow the flexible clamp to go round the
tested wire or conductor, insert the flexible clamp into the bonnet lock, and lock the
bonnet lock (see the figure below);
3）The device identifies and measures the DC current automatically;
4）The current is shown on the main display, and the frequency is shown on the
auxiliary display;
5）In the event of current measurement, if both V jack and COM jack measure the
voltage or resistance, then the main display will show the voltage or current, and the
auxiliary display will show the current instead of the frequency;
6）At the end of measurement, press the power button to turn off the device.
Warning: To avoid such possible safety accidents as electric shock or bodily
injury, please strictly observe the safety work guidelines.
Note: It needs much time for zero return after current measurement. This arises from
the measuring circuit for true RMS. It is normal.
8.General Technical Indicators
Environmental conditions for service:
EN61010-1, EN61010-2-032, EN61326-1,CAT IV 600V, class of pollution 2;
Height above sea level: < 2000 m;
Temperature and humidity of working environment: 0~40℃(<80% RH, ignored at <10
℃);
Temperature and humidity of storage environment: (-10~60℃, with battery removed);

7
Temperature coefficient: 0.1x accuracy/ ℃;
Allowable maximum voltage between measuring terminal and ground: DC 600V or AC
effective value;
Sampling rate: around 3 times per second;
Display: LCD;
Over range indication: “OL” displayed;
Low battery voltage indication: “ ” will be shown on the display, when the
battery voltage is lower than the normal working voltage;
Input polarity indication: the symbol “-” is automatically displayed;
Power source: 3x1.5V AAA battery;
Overall dimension: 324x178x30mm.
Accuracy Indicator
The accuracy applies within one year of calibration.
Reference conditions: ambient temperature 18℃~28℃, relative humidity≤80%.
DC Voltage
Range
Resolution
Accuracy
6V
0.001V
± (0.8% +3
Digits
)
60V
0.01V
600V
0.1V
Minimum DC voltage measurement: 0.2V (DC);
Input impedance: 2MΩ;
Maximum input voltage: 600V DC or AC effective value.
AC Voltage
Range Resolution
Accuracy
45~65Hz
40~45,65~2000Hz
6V
0.001V
± (1.2% +3Digits) ± (2.0% + 5Digits)
60V
0.01V
600V
0.1V

8
Minimum AC voltage measurement: 0.5V (AC);
Input impedance: 2MΩ;
Maximum input voltage: 600V DC or AC effective value;
Frequency domain: 40Hz~2000Hz, true RMS.
Other frequencies are not validated yet.
Position Error of Flexible Clamp
The precision and position error refers to the error of measurement taken at the best
measuring position, within the range of working temperature and humidity, in the
absence of interference from external electric field or magnetic field.
Optimum Measuring Range
Position Error
A
35 mm
±0.5%
B
50 mm
±1.5%
C
60 mm
±2.0%
D
>60 mm
±5.0%

9
AC Current
Range
Resolution
Accuracy (40~65Hz)
60A
0.01A
± (1.5% +5 Digits)
(<10A: ± (2.0% +10 Digits))
600A
0.1A
3000A
1A
± (2.0% +5 Digits)
Range Resolution Accuracy (65~200Hz)
60A
0.01A
± (2.5% +5 Digits)
600A
0.1A
3000A
1A
± (3.0% +5Digits)
Range Resolution Accuracy (200~1,000Hz)
60A
0.01A
≤1000A ± (3.0% +5Digits)
＞1000A Reference resources
600A
0.1A
3000A
1A
Minimum AC current measurement: 0.1A. 0 is displayed when the measured value is
smaller than 0.1A.
Maximum measured current: effective value of AC 3,000A.
Frequency domain: 40Hz~1000Hz, true RMS

10
Frequency
Range Resolution Accuracy
40~1000Hz
0.1Hz
± (0.5% +2 Digits)
1kHz~10kHz
1Hz
Current channel: sensitivity 3A, range40~1kHz;
Voltage channel: sensitivity 0.5V, range40~10kHz.
Resistance
Range
Resolution
Accuracy
6kΩ
0.001 kΩ
± (1.0%+3Digits)
60kΩ
0.01 kΩ
600kΩ
0.1 kΩ
6MΩ
0.001MΩ
Input protection: max. 600V DC or AC effective value.
Connectivity
Function
Description
Testing Environment
When the built-in
buzzer sounds, the
measured resistance
is less than 50
Ω
.
Tested current: around
1mA; open-circuit voltage:
around 0.8V.
Input protection: max. 600V DC or AC effective value.
9.Instrument Maintenance
This section provides the basic maintenance information. If you are not an experienced

11
maintainer, and are not acquainted with the calibration, performance testing and
maintenance, your attempt to maintain the device is not recommended.
Warning
To avoid any possible electric shock, fire or bodily injury:
If the battery cover or back cover is opened, never use the device for any
measurement;
Remove the input signal before cleaning the device;
Use the specified replacement parts. The device shall be maintained by
the qualified technical staff.
General Maintenance
Use the wet cloth and a small amount of detergent to clean the outer casing
of the device. Never use any abrasive or chemical solvent.
Battery Replacement
Warning
To avoid any electric shock or bodily injury due to wrong reading, the
battery shall be promptly replaced, when the symbol“ ” appear on
the device’s display.
To ensure safe operation and maintain the product, the battery shall be
removed if the device will not be used for a long time, to avoid any damage
to the product due to electric leakage of the battery.
Only use the fuse tube of the specified amperage, fuse rating, voltage
rating and fusing rate.
To avoid any electric shock or bodily injury, before opening the back cover
for replacing the battery, turn off the device, and disconnect the pens from
the measured circuit.
Replace the battery by following the steps below:
Turn off the device;
Disconnect the pens from the measured circuit, and remove them from the
device;
Unscrew with the screwdriver the screw fixing the battery cover, and
remove the battery cover;
Remove the old battery, and place a new one;
Replace the battery cover, and tighten the screw.

12
MT-3112 3 5/6 智慧型真有效值柔性鉗錶使用說明書
1.聲明
根據國際版權法，未經允許和書面同意，不得以任何形式複製本說明書的任何內容。本說明
書在將來的版本中如有更改，恕不另行通知。
警告
“警告”標誌表示會對用戶造成危險的狀況和操作。要求在執行此操作時必須注意，如果不正確執
此行操作或不遵守此操作步驟，則可能導致人身傷害或傷亡。在不滿足這些條件或沒有完全理解
的情況下，請勿繼續執行警告標誌所指示的任何操作。
2.安全資訊
使用儀錶前，請仔細閱讀說明書並注意有關安全警告資訊。
儀錶根據國際安全標準 EN61010-1, EN61010-2-032,EN61326-1對電子測試儀器的安全要
求而設計的。儀錶的設計與製造嚴格遵守 EN61010-1, EN61010-2-032, EN61326-1,CAT IV 600V
過壓安全標準和污染等級 2規定。
3.安全工作規範
警告:為了避免可能的觸電或人身傷害等安全事故，請切實遵守以下的規範：
使用儀錶之前，請仔細閱讀本說明書，並特別注意安全警告資訊。嚴格遵守本手冊的操作使
用本儀錶，否則儀錶所提供的保護功能可能會遭到破壞或削弱。
使用儀錶之前，請檢查儀錶外殼是否存在裂紋或塑膠件損壞,檢查表筆絕緣層是否損壞，是否
有外露金屬或有磨損跡象，檢查表筆連通性，若有請勿再使用。
使用儀錶之前，請檢查柔性鉗絕緣層是否損壞，若有請勿再使用。
使用儀錶之前，請用儀錶測量一個已知電壓來驗證儀錶是否正常。
請按儀錶或手冊上指定的測量類別、電壓或電流額定值使用儀錶。
請遵守當地和國家的安全規範。穿戴個人防護用品（如經認可的橡膠手套、面具和阻燃衣物
等），以防危險帶電導體外露時遭受電擊和電弧而受傷。
在輸入端子之間或在任何一個端子與接地點之間施加的電壓不能超過儀錶上標明的額定值。

13
測量超出 30V 交流真有效值，42V 交流峰值或 60V 直流時，請特別小心。該類電壓會有電
擊的危險
當儀錶電池電量低指示符出現時，請及時更換電池，以防測量錯誤。
切勿在有爆炸性氣體或蒸汽周圍或潮濕的環境中使用儀錶。
使用表筆時，請將手指握在探頭護指裝置的後面。
測量時，請先連接零線或地線，再連接火線；斷開時，請先斷開火線，再斷開零線和地線。
打開外殼或電池蓋之前，請將儀錶上的表筆移除。切勿在儀錶拆開或電池蓋打開的情況下使
用儀錶。
儀錶只能和所配備的表筆一起使用才符合安全標準的要求。如表筆破損需更換，必須換上同
樣型號和相同電氣規格的表筆。
4.安全符號
高壓警告
AC（交流電）
DC（直流電）
交流電或直流電
警告，重要安全標誌
接地
設備由雙重絕緣或加強絕緣保護
電池電量不足
符合歐洲共同體(European Union)標準
說明不得將此電氣/電子產品丟棄在家庭垃圾中。
CAT. III 1000V III 類1000V 過電壓保護

14
CAT. IV 600V IV 類600V 過電壓保護
5.概述
本儀錶是一款智慧型數字柔性鉗形表。可以測量直流電壓、交流電壓、交流電流、頻率、電阻及
連通性，並且能夠自動識別測量信號，不需要使用者選擇測量功能。
6.面板說明
①柔性鉗，用於測量交流電流
②柔性鉗鎖扣
③主顯
④副顯
⑤背光鍵
⑥照明燈鍵
⑦電源開關鍵
⑧數據保持鍵
⑨COM 輸入插孔
⑨V 輸入插孔
7.使用儀錶
本儀錶是一款智慧型數字柔性鉗形表，所以使用操作非常簡單，測量時不需要進行功能選擇，儀
錶會自動識別測量信號，然後測量並顯示測量結果。
開機／關機
開機：在儀錶關機狀態下，按 鍵並保持，直到蜂鳴器“嘀”一聲，再鬆開。
關機：在儀錶開機狀態下，按 鍵並保持，直到蜂鳴器“嘀”一聲，再鬆開。
自動關機功能
在無任何按鍵操作，同時無任何信號輸入時，儀錶會在約 5分鐘內自動關機。
背光功能
按 鍵開啟背光；再按 鍵關閉背光。

15
照明功能
按 鍵開啟照明燈；再按 鍵關閉照明燈。
資料保持功能
按 鍵開啟資料保持，顯示幕顯示“H”字元；再按 鍵關閉資料保持。
交直流電壓/電阻測量/連通性檢測
1. 按下電源鍵，打開儀錶的電源。
2. 將紅表筆插在 V插孔，黑表筆插在 COM 插孔。
3. 將表筆並聯到待測電路、電源或電阻上。儀錶自動判別交流電壓、直流電壓、電阻。
4. 當測量電阻時，電阻小於約 50Ω時，內置蜂鳴器發聲。
5. 從顯示幕讀取測量結果。測量直流電壓時，顯示幕同時顯示紅色表筆測試點的電壓極性。
6. 測量交流電壓時，頻率將同時顯示在副顯。
7. 測量結束，按下電源鍵，關閉儀錶電源。
儀錶自動檢測的順序：
交流電壓 直流電壓 交流電流 電阻及通斷
警告:為了避免可能的觸電或人身傷害等安全事故，請切實遵守安全工作規範
交流電流測量
1. 按下電源鍵，打開儀錶的電源。
2. 將柔性鉗的鎖扣鬆開，將柔性鉗繞過被測導體或導線，然後將柔性鉗插入鎖扣，將鎖扣鎖緊
（如下圖所示）。
3. 儀錶自動識別交流電流，並測量。
4. 電流顯示在主顯，頻率同時顯示在副顯。
5. 在測量電流時，如果 V插孔和 COM 插孔同時在測量電壓或電阻，則主顯顯示電壓或電阻；
副顯示則顯示電流，頻率則不顯示。
6. 測量結束，按下電源鍵，關閉儀錶電源。

16
警告:為了避免可能的觸電或人身傷害等安全事故，請切實遵守安全工作規範
注意：測量電流後回零比較慢，這是由於真有效值測量電路引起的，是正常現象。
8.通用技術指標
使用環境條件:
EN61010-1, EN61010-2-032, EN61326-1,CAT IV 600V，污染等級 2
海拔高度< 2000 m
工作環境溫濕度：0~40℃（<80% RH，<10℃時不考慮）
儲存環境溫濕度：-10~60℃（<70% RH, 取掉電池）
溫度係數：0.1×準確度/℃
測量端和地之間允許的最大電壓：600V 直流或交流有效值
採樣速率：約 3次/秒。
顯示：液晶顯示幕
超量程指示：顯示“OL”。
電池低壓指示：當電池電壓低於正常工作電壓時，“ ”將顯示在顯示幕上。
輸入極性指示：自動顯示“−”號
電源： 3x1.5V AAA 電池
外形尺寸：324x178x30mm
準確度指標
準確度在校準後一年內適用。
基準條件：環境溫度 18℃至 28℃、相對濕度不大於 80%。

17
直流電壓
量程 解析度 準確度
6V 0.001V
±（0.8% 讀數 +3 字）
60V 0.01V
600V 0.1V
最小直流電壓測量：0.2V 直流電壓
輸入阻抗：2MΩ
最大輸入電壓：600V DC 或AC 有效值。
交流電壓
量程 解析度
準確度
45~65Hz 40~45,65~2000Hz
6V 0.001V
±（1.2%讀數 +3 字） ±（2.0%讀數 +5 字）
60V 0.01V
600V 0.1V
最小交流電壓測量：0.5V 交流電壓
輸入阻抗：2MΩ
最大輸入電壓：600V DC 或AC 有效值。
頻率範圍：40Hz~2000Hz ，真有效值回應。
其它頻率未驗證。
柔性鉗位置誤差
精度和位置誤差是在沒有外部的電場或磁場干擾，在工作溫濕度範圍內，在最佳測量位置所測量
的誤差。

18
最佳測量範圍 位置誤差
A 35 mm ±0.5%
B 50 mm ±1.5%
C 60 mm ±2.0%
D >60 mm ±5.0%
交流電流
量程 解析度 準確度（40~65Hz）
60A 0.01A ±（1.5%讀數 +5 字）
(<10A±（2.0%讀數 +10 字)
600A 0.1A
3000A 1A ±（2.0%讀數 +5 字）
量程 解析度 準確度（65~200Hz）
60A 0.01A
±（2.5%讀數 +5 字）
600A 0.1A
3000A 1A ±（3.0%讀數 +5 字）

19
量程 解析度 準確度（200~1000Hz）
60A 0.01A
≤1000A ±（3.0%讀數 +5 字）
＞1000A 參考
600A 0.1A
3000A 1A
最小交流電流測量：0.1A，當測量值小於 0.1A 時顯示 0。
最大測量電流：3000A 交流電流有效值。
頻率範圍：40Hz~1000Hz，真有效值回應。
頻率
量程 解析度 準確度
40~1000Hz 0.1Hz
±（0.5%讀數 +2 字）
1kHz~10kHz 1Hz
電流通道：靈敏度 3A，測量範圍 40~1kHz
電壓通道：靈敏度 0.5V，測量範圍 40~10kHz
電阻
量程 解析度 準確度
6kΩ 0.001 kΩ
±（1.0% 讀數 +3 字）
60kΩ 0.01 kΩ
600kΩ 0.1 kΩ
6MΩ 0.001MΩ
輸入保護：最大 600V DC 或AC 有效值。
蜂鳴通斷
功能 說明 測試環境
當內置蜂鳴器發聲時，被
測電阻小於約 50Ω。測試電流：約 1mA；開路電壓：約 0.8V。