Prokit's Industries MT-3120 User Manual

MT-3120

2A Mini Autorange Clamp Meter

User’s Manual

1st Edition, 2010

2A Mini Autorange Clamp Meter user manual

CONTENTS

1. SAFETY INFORMATION …………1

1.1 PRELIMINARY ………… 1

1.2 DURING USE ……………2

1.3 SYMBOLS ……………3

1.4 MAINTENANCE ……………3

2. DESCRIPTION ………… 5

2.1 NAMES OF PARTS ……………5

2.2

SWITCH, BUTTONS AND INPUT JACKS

2.3 LCD (Liquid-crystal display) ……………9

……………8

3. SPECIFICATIONS …………10

3.1 GENERAL SPECIFICATIONS ……………10

3.2 TECHNICAL SPECIFICATIONS ……………11

4. OPERATION INSTRUCTION ………… 15

4.1 HOLDING READINGS ……………15

4.2 SWITCHING RANGES ……………15

4.3 SWITCHING MAXIMUM VALUE ……………15

4.4 SWITCHING FUNCTIONS ……………16

BACK LIGHT AND CLAMP LIGHTING BULB

4.5

4.6 AUTO POWER OFF ……………17

4.7 PREPARING FOR MEASUREMENT ……………17

4.8 MEASURING AC CURRENT ……………18

4.9 MEASURING AC VOLTAGE ……………20

4.10 MEASURING DC VOLTAGE ……………22

4.11 MEASURING RESISTANCE ……………24

……………16

2A Mini Autorange Clamp Meter user manual

4.12 TESTING DIODE ……………26

4.13 TESTING CONTINUITY ……………28

5. MAINTENANCE ………… 30

5.1 REPLACING THE BATTERIES ……………30

5.2 REPLACING TEST LEADS ……………30

6. ACCESSORIES ………… 32

2A Mini Autorange Clamp Meter user manual

1. SAFETY INFORMATION

WARNING

BE EXTREMELY CAREFUL WHEN USING THIS METER. Improper use of

this device can result in electric shock or destruction of the meter. Take

all normal safety precautions and follow the safeguards suggested in

this manual.

To exploit full functionality of the meter and ensure safe operation,

please read carefully and follow the directions in this manual.

This meter has been designed according to IEC-61010 concerning electronic

measuring instruments with an overvoltage category CAT III 600V and pollution

Follow all safety and operating instructions to ensure safe use of the meter.

1.1 PRELIMINARY

1.1.1 When using the meter, the user must observe all normal safety rules

concerning:

- General protection against electric shock

- Protection of the meter against misuse

1.1.2 When the meter is delivered, check whether it has been damaged in

transit.

1.1.3 After being stored and delivered under harsh conditions, the meter should

be checked and confirmed whether any damages have been incurred.

1.1.4 Test leads must be kept in good condition. Before using check whether the

insulation on test leads has been damaged and any wire has been

exposed.

1.1.5 Use the test leads supplied to ensure operation safety. If required, they

must be replaced with test leads of the same model or class.

2A Mini Autorange Clamp Meter user manual

1.2 DURING USE

1.2.1 Use the right input jack, function and range.

1.2.2 Do not take measurements that exceed the protection limit values indicated

in the specifications.

1.2.3 Do not touch the metal tips of the test leads when the meter is connected to

the circuit to be measured.

1.2.4 Keep your fingers behind the probe barriers when taking a measurement

with an effective voltage above 60V DC or 30V rms AC.

1.2.5 Do not take voltage measurement if the value between the terminals and

earth ground exceeds 600V.

1.2.6 Select the highest range if the value scale to be measured in the manual

range is unknown.

1.2.7 Disconnect the test leads from the circuit under test before turning the

rotary selector to change functions.

1.2.8 Do not measure the resistance, diode or continuity of live circuits.

1.2.9 Do not connect the meter to any voltage source while the rotary selector is

in the current, resistance, diode or continuity range.

1.2.10 Do not use the meter near explosive gases, steam or dirt.

1.2.11 Stop using the meter if any abnormalities or faults are observed.

1.2.12 Do not use the meter unless its rear case and battery cover is securely

fastened in its original position.

1.2.13 Do not store or use the meter in areas exposed to direct sunlight, at high

temperature or with high relative humidity.

1.3 SYMBOLS

Caution, risk of danger (Important safety information; refer to the

operation manual.)

Application around and removal from HAZARDOUS LIVE conductors is

2A Mini Autorange Clamp Meter user manual

permitted.

Double insulation（Protection class II）.

CAT III Overvoltage (Installation) category III, Pollution Degree 2 per

IEC1010-1 refers to the level of Impulse Withstand Voltage protection

provided.

Conforms to European Union Directive

Earth (ground) terminal

1.4 MAINTENANCE

1.4.1 Do not attempt to remove the rear case to adjust or repair the meter. Such

actions should only be performed by a technician who fully understands the

meter and the danger involved.

1.4.2 Before opening the case and battery cover of the meter, always disconnect

test leads from all sources of electric current. Disconnect the test leads

from all sources of electric current before opening the rear case and battery

cover of the meter.

1.4.3 To avoid any electric shock caused by error readings, replace the batteries

immediately when the “

1.4.4 Use damp cloth and mild detergent to clean the meter; do not use

abrasives or solvents.

1.4.5 Turn the rotary selector to OFF position to switch off the power when the

meter is not in use.

1.4.6 Remove the batteries to avoid damages to the meter if it will idle for a long

time.

” sign appears on the display.

2A Mini Autorange Clamp Meter user manual

2. DESCRIPTION

- This meter is a portable professional measuring instrument with LCD and

back light easily reading. The ‘single-hand operation’ design for the range

switch makes measurement simple and easy. Overload protection and low

battery indication are provided. It is an ideal multi-function Instrument with

scores of practical applications for professional, workshop, school, hobby

and home use.

- The meter can perform measurements of AC current, AC/DC voltage,

resistance，as well as continuity and diode test.

- Both auto range and manual range are available.

- This meter is equipped with reading hold function.

- This meter is equipped with maximum value measuring function.

- This meter has function of auto power off.

2.1 NAMES OF COMPONENTS

⑴ Current Clamp

⑵ Clamp Lighting Bulb

⑶ Panel

⑷ Trigger

⑸ Back Light Switch Button (

⑹ Function Switch Button (SEL)

⑺ MAX Switch Button (MAX)

⑻ Liquid Crystal Display (LCD)

⑼ COM Jack

⑽ Input Jack

⑾ Auto/Manual Switch Button (RAN)

⑿ Reading Hold (HOLD)

⒀ Rotary selector

)

2A Mini Autorange Clamp Meter user manual

⒁ OFF - power switch

2A Mini Autorange Clamp Meter user manual

⒂ Rear Case

⒃ Fixing Screw Of The Battery Cover

⒄ Battery Cover

2A Mini Autorange Clamp Meter user manual

2.2 SWITCH, BUTTONS AND INPUT JACKS

Button - For control backlight

SEL Button - For switching among measuring functions

MAX Button - For switching maximum value measurement

RAN Button - For switching between auto and manual ranges

HOLD Button - For holding the reading

INPUT Jack - For measuring voltage, resistance, diode and continuity.

COM Jack - Common input connection for current, voltage, resistance, diode

and continuity measurement.

OFF Position - For turning off the power.

Rotary Selector - For selecting functions and ranges.

Clamp - For measuring current

2.3 LCD (Liquid-crystal display)

2A Mini Autorange Clamp Meter user manual

Continuity buzzer

AUTO Auto range mode

MANU Manual range mode

MAX The maximum value is being measure

Battery low

H This indicates that the display data is being held.

mV, V Milli-volts, Volts (Voltage)

A Amperes (Current)

Ω, kΩ, MΩ Ohms, Kilo-ohms, Mega-ohms (Resistance)

3. SPECIFICATIONS

Calibration is required once a year, to be carried out at a temperature between

18°C and 28 °C (64°F to 82°F) and relative humidity below 75%.

3.1 GENERAL SPECIFICATIONS

3.1.1 Auto range and manual range options are available.

3.1.2 Over range protection is provided for all ranges.

3.1.3 Maximum voltage between terminals and earth ground: 600V DC or rms

3.1.4 Operating altitude: max. 2000 meters (7000 ft.)

3.1.5 Display: LCD

3.1.6 Maximum value display: 1999 digits

3.1.7 Polarity indication: automatic; ‘-‘ for negative polarity.

3.1.8 Over range indication: ‘0L’ or ‘-0L’

3.1.9 Sampling Time: approx. 0.4 second per sample

3.1.10 Unit indication: function and unit.

3.1.11 Auto power off time: 15 min.

Alternating current

Direct current

Diode test

2A Mini Autorange Clamp Meter user manual

3.1.12 Operating power : 1.5V×3 AAA batteries

3.1.13 Battery low indication: ‘

3.1.14 Temperature factor: < 0.1×Accuracy /℃

3.1.15 Operating temperature: 0 ℃ to 40℃（32°F to 104°F）

3.1.16 Storage temperature: -10 to 50℃℃（10°F to 122°F）

3.1.17 Dimension: 208×78×35mm

3.1.18 Weight: approximate 340g（including batteries）

’ on LCD

3.2 ELECTRICAL SPECIFICATIONS

Ambient temperature: 23±5 Relative ℃ humidity: < 75%

3.2.1 AC Current

Range Resolution Accuracy

±（3.5% of rdg +20 digits）≤0.5A2A 0.001A

±（3.0% of rdg + 10 digits）

20A 0.01A ±（3.0% of rdg + 10 digits）

200A 0.1A ±（2.5% of rdg + 10 digits）

600A 1A ±（1.5% of rdg + 5 digits）

- Max. input current: 600A

- Frequency range: 50 to 60Hz

- Response: average, calibrated in rms of sine wave

3.2.2 AC Voltage

Range Resolution Accuracy

2V 0.001V

20V 0.01V ±(1.0% of rdg + 5digits)

200V 0.1V

600V 1V ±(1.2% of rdg + 5digits)

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Prokit's Industries MT-3120 User Manual

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Frequently Asked Questions

User Manual