MT-3120
2A Mini Autorange Clamp Meter
User’s Manual
1st Edition, 2010
©2010 Copy Right by Prokit’s Industries Co., Ltd.
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
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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
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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
2.
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.
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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.
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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
)
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⒁ OFF - power switch
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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)
m
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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
AC
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.
10
Alternating current
Direct current
Diode test
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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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- Input impedance: 10MΩ
- Overload protection: 200mV range: 250V DC or rms AC, 2V-600V ranges:
600V DC or 600V rms AC.
- Max. input voltage: 600V rms AC
- Frequency range: 40 to 200Hz
- Response: average, calibrated in rms of sine wave
NOTE:
At small voltage range, unsteady readings will appear before the test leads
contact the circuit. This is normal because the meter is highly sensitive. When
the test leads contact the circuit, the true reading will be shown.
3.2.3 DC Voltage
Range Resolution Accuracy
200mV 0.1mV
2V 0.001V ±(0.8% of rdg + 2digits)
20V 0.01V
200V 0.1V
600V 1V ±(1.0% of rdg + 2digits)
- Input impedance: 10MΩ
- Overload protection: 200mV range: 250V DC or rms AC, 2V-600V ranges:
600V DC or 600V rms AC.
- Max. input voltage: 600V DC
NOTE:
At small voltage range, unsteady readings will appear before the test leads
contact the circuit. This is normal because the meter is highly sensitive. When
the test leads contact the circuit, the true reading will be shown.
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3.2.4 Resistance
Range Resolution Accuracy
200Ω 0.1Ω
2kΩ 0.001kΩ
20kΩ 0.01kΩ
200kΩ 0.1kΩ
2MΩ 0.001MΩ
20MΩ 0.01MΩ ±(2.0% of rdg + 5digits)
- Open circuit voltage: 0.25V
- Overload protection: 250V DC or rms AC
3.2.5 Diode
Range Resolution Function
0.001V displaying approximate forward voltage
of diode
- Forward DC current ~ 1mA
- Reversed DC voltage ~ 1.5V
- Overload protection: 250V DC or rms AC
3.2.6 Continuity
Range Resolution Function
0.1Ω Built-in buzzer will sound, if resistance
- Open circuit voltage ~ 0.45V
- Overload protection: 250V DC or rms AC
±(1.2% of rdg + 2digits)
is lower than 60Ω.
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4. OPERATION INSTRUCTION
4.1 HOLDING READINGS
4.1.1 Press the “HOLD” button to hold the readings while taking measurement
and the value on the display will be held.
4.1.2 Press the “HOLD” button again to release the READING HOLD function.
4.2 SWITCHING RANGES
4.2.1 When the meter is turned on, it is at the auto range mode for measuring
current, voltage, resistance, capacitance and frequency.
4.2.2 Press the "RAN" button for manual range mode. The range will go up one
level at each press and return to the lowest level when the highest level is
reached.
4.2.3 Press the "RANGE" button for two or more seconds to return to the auto
range.
4.2.4 When measuring the maximum or minimum value, press the "RAN" button,
the meter will recover the normal working condition.
4.3 SWITCHING MAXIMUM VALVE
4.3.1 At the voltage and current range, press the “MAX” button to switch to
maximum value measurement.
4.3.2 Press the “MAX” button again, the meter will recover the normal working
condition.
4.4 SWITCHING FUNCTIONS
4.4.1 Press the "SEL" button to switch between AC and DC measurement at the
voltage ranges.
4.4.2 Press the "SEL" button to switch among diode and continuity ranges.
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4.5 BACK LIGHT AND CLAMP LIGHTING BULB
4.5.1 Press the ” ” button for two or more seconds to switch on the back light
if the light in the environment is too dim for taking reading, which will last for
15 seconds.
4.5.2 To turns off the light, press the “
to off the back light.
4.5.3 At the current range, when the back light is switch on, the clamp lighting
bulb will brighten up.
NOTE:
- LED, which requires a larger working current, is the main source of back light.
Although the meter is equipped with a timer set at 15 seconds (i.e. the back
light will be off automatically after 15 seconds), frequent use of the back light
will shorten the life of the batteries. Therefore, do not use the back light
unless necessary.
- When the battery voltage is ≤3.6V, the symbol “
on the LCD. When the back light is on, even if the battery is ≥3.6V, the
” may appear because of its large working current which will cause the
“
voltage to drop. (The accuracy of the measurement cannot be assured when
“symbol appears.) In this case, no need to replace the batteries yet.
the “
Normally, the batteries can last until the “
is not being used.
” button for two or more seconds again
”（battery low）will appear
” appears when the back light
4.6 AUTO POWER OFF
4.6.1 If there is no any operation within any fifteen minutes after power is on,
meter will auto power off.
4.6.2 Turn the rotary selector or press any button to resume operation of the
meter under the auto power off mode.
4.6.3 At the same time when power on, if press the”HOLD” button, auto power off
disable.
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2A Mini Autorange Clamp Meter user manual
4.7 PREPARATING FOR MEASUREMENT
4.7.1 Switch on the power by turning the rotary selector. If the battery voltage is
lower than 3.6V, the “
replaced.
4.7.2 The “
exceed the specified value in order to protect the internal circuit from
damage.
4.7.3 Turn the rotary selector to the required function and range to be measured.
Under the manual mode, choose the highest range when the value scale to
be measured is unknown.
4.7.4 Connect the common test lead first and then the charged test leads when
making connection. Take away the charged test lead first when
disconnecting.
” symbol shows that the input voltage or current should not
” symbol will appear and the batteries should be
4.8 MEASURING AC CURRENT
WARNING
Beware of Electrocution.
Ensure that the test leads are disconnected from the meter
before making current clamp measurements.
4.8.1 Set the rotary selector to the A range position.
4.8.2 If necessary, press the “RAN” button to choose the manual range mode.
4.8.3 Press the trigger to open jaw. Fully enclose only one conductor.
4.8.4 Take the reading on the LCD.
NOTE:
1) For right results, do not enclose more than one conductor in the jaw.
2) For optimum results, center the conductor in the jaw.
3) At the manual range mode, when only ‘OL’ is shown on the LCD, it means
the measurement has exceeded the range. A higher range should be
2A Mini Autorange Clamp Meter user manual
selected.
4) Under the manual range mode, when the scale of the value to be measured
is unknown beforehand, set the range to the highest.
” means the maximum input current is 600A rms AC.
5) “
Correct Incorrect
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2A Mini Autorange Clamp Meter user manual
4.9 MEASURING AC VOLTAGE
WARNING
Beware of Electrocution.
Pay special attention to avoid electric shock when measuring
high voltage.
Do not input the voltage which more than 600V rms AC.
4.9.1 Plug the black test lead into the COM jack and the red test lead into the
INPUT jack.
4.9.2 Set the rotary selector to the V
V measurement mode.
4.9.3 If necessary, press the “RAN” button to choose the manual range mode.
4.9.4 Connect the test leads to the voltage source or load terminals for
measurement.
4.9.5 Take the reading on the LCD.
NOTE:
1) At small voltage range, unsteady readings may appear before the test leads
contact the circuit. This is normal because the meter is highly sensitive.
When the test leads contact the circuit, the true reading will be shown.
2) At the manual range mode, when only ‘OL’ is shown on the LCD, it means
the measurement has exceeded the range. A higher range should be
selected.
3) At the manual range mode, when the scale of the value to be measured is
unknown, select the highest range first and lower the range gradually.
” means the maximum input voltage is 600V rms AC.
4) “
range position, then the meter at the AC
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4.10 MEASURING DC VOLTAGE
WARNING
Beware of Electrocution.
Pay special attention to avoid electric shock when measuring
high voltage.
Do not input the voltage which more than 600V DC.
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2A Mini Autorange Clamp Meter user manual
4.10.1 Plug the black test lead into the COM jack and the red test lead into the
INPUT jack.
4.10.2 Set the rotary selector to the V
4.10.3 Press the "SEL" as switch to DC V measurement. If necessary, press the
“RAN” button to choose the manual range mode.
4.10.4 Connect the test leads to the voltage source or load terminals for
measurement.
4.10.5 Take the reading on the LCD. The polarity symbol denotes the polarity of
the end connected by the red test lead.
NOTE:
1) At small voltage range, unsteady readings will appear before the test leads
contact the circuit. This is normal because the meter is highly sensitive.
When the test leads contact the circuit, the true reading will be shown.
2) Under the manual range mode, when only ‘OL’ or ‘-OL’ is shown on the LCD,
it means the measurement has exceeded the range. A higher range should
be selected.
3) Under the manual range mode, when the scale of the value to be measured
is unknown beforehand, select the highest range first and lower the range
gradually.
” means the maximum input voltage is 600V DC.
4) “
range position.
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4.11 MEASURING RESISTANCE
WARNING
Beware of Electrocution.
When measuring in-circuit resistance, make sure that the
power of the circuit under test has been turned off and that
all capacitors have been fully discharged.
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4.11.1 Plug the black test lead into the COM jack and the red test lead into the
INPUT jack.
4.11.2 Set the rotary selector to the Ω range position.
4.11.3 If necessary, press the “RAN” button to choose the manual range mode.
4.11.4 Connect the test leads to the ends of the resistor or circuit for
measurement.
4.11.5 Take the reading on the LCD.
NOTE:
1) At the manual range mode, when only ‘OL’ is shown on the LCD, it means
the measurement has exceeded the range. A higher range should be
selected.
2) When the input is open, ‘OL’ will appear on the LCD to indicate that the
range has been exceeded.
3) For measuring resistance above 1MΩ, it may take a few seconds to get a
steady reading. This is normal for high resistance reading.
2A Mini Autorange Clamp Meter user manual
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4.12 TESTING DIODE
4.12.1 Plug the black test lead into the COM jack and the red test lead into the
INPUT jack.
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4.12.2 Set the rotary selector to the range position, then the meter at
test mode.
the
4.12.3 Connect the red test lead to the anode and the black test lead to the
cathode of the diode for testing.
4.12.4 Take the reading on the LCD.
NOTE:
1) The meter will show the approximate forward voltage drop of the diode.
2) When the test leads have been reversed or open, ‘OL’ will appear on the
LCD.
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4.13.1 Plug the black test lead into the COM jack and the red test lead into the
INPUT jack.
4.13.2 Set the rotary selector to the
4.13.3 Press the "SEL" button as switch to
4.13.4 Connect the test leads to the two ends of the circuit for measurement.
4.13.5 If the resistance of the circuit being tested is less than 50Ω, the built-in
buzzer will sound.
4.13.6 Take the reading on the LCD.
NOTE:
If the test leads are open or the resistance of the circuit is over 200Ω, “OL” will
appear on the LCD.
range position.
continuity test.
4.13 TESTING CONTINUITY
Beware of Electrocution.
Make sure that the power of the circuit has been turned off and
the capacitors have been fully discharged before testing the
continuity of a circuit.
WARNING
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5. MAINTENANCE
5.1 REPLACING THE BATTERIES
WARNING
To avoid electric shock, make sure that the test leads have
been clearly move away from the circuit under measurement
before opening the battery cover of the meter.
5.1.1 If the sign “ ” appears, it means that the batteries should be replaced.
5.1.2 Loosen the fixing screw of the battery cover and remove it.
5.1.3 Replace the exhausted batteries with new ones.
5.1.4 Put the battery cover back and fix it again to its origin form.
NOTE:
Do not reverse the poles of the batteries.
5.2 REPLACING TEST LEADS
WARNING
The replacement must be test leads in good working condition
with the same or equivalent rating: 1000V 10A.
A test lead must be replaced if the insulation layer has been damaged, e.g. the
wire inside is exposed.
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2A Mini Autorange Clamp Meter user manual
6. ACCESSORIES
1) Test Leads: Electric Ratings 1000V 10A 1 pair (set)
2) Operating Manual 1 copy
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Certificate Number: TW98/12323QA
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