MASTECH MS2016A Leakage Clamp Meter Operation Manual

1. Safety Information

WARNING: Improper usage of this meter can cause electric shock and damage. Always comply with safety measures and operating instructions.

The meter is designed and manufactured according to safety requirements of EN 61010-1:2010, EN 61010-2-032, EN 61010-2-033 for electronic measuring instruments and handheld digital multimeters. It conforms to UL STD.61010-1, 61010-2-032, 61010-2-033, and is certified to CSA STD.C22.2 NO.61010-1, 61010-2-032, 61010-2-033. The product meets the requirements of 600V CAT III and pollution degree 2.

Failure to follow safety guidelines may impair the instrument's protection.

Warning symbols in this manual alert users to potential dangerous situations.

Precautions are to prevent damage to the instrument or the test object.

1.1 Preliminary

When using the meter, comply with standard safety rules:

• General shock protection
• Prevent misusing the meter

Check for damage during transportation. If stored under harsh conditions, confirm if the meter is damaged.

Ensure probes are in good condition, with intact insulation. Use the provided probe table for safety. Replace probes with identical ones or those with the same performance level if necessary.

1.2 Usage

• Select the correct function and measuring range.
• Do not measure beyond the stated indication value for each range.
• When measuring a circuit with the meter connected, do not touch the probe tip (metal part).
• When measuring voltages above 60V DC or 30V AC (RMS), keep fingers behind the finger protection device.
• Do not measure voltages greater than 600V DC or AC (RMS).
• In manual range mode, select the highest range first for unknown values.
• Before changing functions, remove probes from the circuit.
• Do not measure resistors, capacitors, diodes, or circuits connected to power.
• Be careful to avoid connecting the meter to a voltage source during tests.
• Discharge capacitors completely before measuring capacitance.
• Do not use the meter in explosive gas, vapor, or dusty environments.
• If abnormal phenomena occur, stop using the meter.
• Do not use the meter unless the bottom case and battery cover are securely fastened.
• Avoid storing or using the meter in direct sunlight, high temperature, or high humidity.
• Verify meter operation by measuring a known voltage. If abnormal, stop use immediately and have it inspected by a qualified technician.

1.3 Mark

Note: Important safety information, refer to the instruction manual.

• ⚠️: Application around and removal from UNINSULATED HAZARDOUS LIVE conductors is permitted.
• [Double Insulation Symbol]: Equipment protected throughout by double insulation or reinforced insulation.
• [UL/CSA Symbol]: Conforms to UL STD. 61010-1, 61010-2-032, 61010-2-033; Certified to CSA STD C22.2 NO. 61010-1, 61010-2-032, 61010-2-033.
• CE: Complies with European (EU) safety standards.
• [Earth Terminal Symbol]: Earth (ground) TERMINAL.
• CAT III: MEASUREMENT CATEGORY III is applicable to test and measuring circuits connected to the distribution part of the building's low-voltage MAINS installation.

1.4 Maintenance

• Do not attempt to adjust or repair the meter yourself. This should only be done by qualified technicians.
• Before opening the case or battery cover, remove probes from the circuit.
• When the [low battery indicator] symbol appears, replace the battery immediately to avoid wrong readings and electric shock.
• Clean the meter with a damp cloth and mild detergent. Do not use abrasives or solvents.
• Power off the meter when not in use by switching the range to "OFF".
• If the meter is not used for a long time, remove the battery to prevent damage.

2. Description

The MASTECH MS2016A is a portable, professional measuring instrument with an LCD display for easy reading. It features single-hand operation for range switching, overload protection, and a low battery indicator. It is an ideal multifunction meter for professionals, factories, schools, and home use.

The meter is used for measuring AC leakage current, AC voltage, DC voltage, resistance, capacitance, circuit continuity, diode, and temperature.

Key features include:

• Reading hold function
• Maximum measuring function
• Minimum measuring function
• Auto power-off function

2.1 Part Name

The meter consists of the following parts:

• (1) Central of the clamp head
• (2) Transfer switch
• (3) Resistance, capacitance, voltage, diode, and continuity input jack
• (4) Common end jack
• (5) LCD display
• (6) Function choice button
• (7) Trigger
• (8) Current clamp head: used for leakage current measurement.
• (9) Protective barrier

2.2 Switch, Button and Input Jack Description

• HOLD/LPF button: Used for reading hold and LPF (50Hz/60Hz) function control.
• FUNC/ZERO button: Used for measuring function switch and current clearing function control.
• MAX/MIN button: Used for maximum/minimum measurement function switch and leakage current measurement.
• OFF position: Used for shutting off the power.
• INPUT jack: For voltage, resistance, capacitance, diode, circuit connection input wire, and temperature terminal.
• COM jack: For voltage, resistance, capacitance, diode, circuit connection common wire, and temperature terminal.
• Transfer switch: Used for selecting function and measuring range.

2.3 LCD Display

The LCD display shows various measurement modes and indicators:

• DC: DC measurement
• AC: AC measurement
• LPF: Low Pass Filter (50Hz/60Hz) function
• AUTO: Automatic measuring range mode
• MAX: Maximum measuring state
• MIN: Minimum measuring state
• [low battery indicator]: Low battery indicator
• H: Reading hold state
• V: Voltage measurement
• A: Amperes (Current) measurement
• nF/µF/mF: Capacitance measurement
• Ω/kΩ/MΩ: Resistance measurement
• ZERO: Current clearing state
• °C/°F: Temperature measuring state
• NCV: Non-Contact Voltage detection
• %mV: Millivolt measurement
• kΩ/Hz: Resistance or Frequency measurement
• numFA: Capacitance measurement (nF, µF, mF)
• [negative polarity symbol]: Indicates negative polarity.
• OL: Exceeding measuring range display.
• [battery undervoltage symbol]: Battery undervoltage indication.

3. Specifications

The meter should be recalibrated under the condition of 18°C~28°C, relative humidity less than 75% once a year.

3.1 General

• Automatic and manual measuring range.
• Full measuring range overload protection.
• Maximum allowable voltage between measurement end and ground: 600V DC or AC (RMS).
• Operational height: maximum 2000m.
• Display: LCD.
• Displayed maximum value: 4000 counts.
• Polarity indication: Automatic; [negative polarity symbol] means negative polarity.
• Exceeding measuring range display: "OL".
• Sampling rate: approximately 3 times/sec.
• Auto off time: 30 minutes.
• Unit display: Shows function and power units.
• Power supply: 2x 1.5V AAA Batteries.
• Battery undervoltage indication: LCD displays [battery undervoltage symbol].
• Temperature coefficient: less than 0.1 x accuracy/°C.
• Operational temperature: 18°C~28°C.
• Storage temperature: -10°C~50°C.
• Dimensions: 213x62x38mm (8.4x2.44x1.5in).
• Weight: approximately 238g (8.4oz) including battery.
• Intended for indoor use.

3.2 Technical Indicators

3.2.1 AC Current

Environment temperature: 23±5°C, relative humidity (RH): <75%

Maximum input current: 150A AC

Frequency range: 40~1kHz

3.2.2 DC Voltage

Input impedance: 10MΩ

Maximum input voltage: 600V DC or AC (RMS)

Note: In small voltage ranges, readings may fluctuate due to high sensitivity when the probe is not connected to the circuit. This does not affect actual measurement results once connected.

3.2.3 AC Voltage

Input impedance: 10MΩ

Maximum input voltage: 600V DC or AC (RMS)

Frequency range: 40~1kHz (sine wave)

Note: In small voltage ranges, readings may fluctuate due to high sensitivity when the probe is not connected to the circuit. This does not affect actual measurement results once connected.

3.2.4 Resistance

Open circuit voltage: approximately 1.0V

Overload protection: 600V DC or AC (RMS)

Note: When the input is open, LCD shows "OL". For resistances >1MΩ, readings may stabilize after a few seconds.

3.2.5 Circuit Continuity Test

Overload protection: 600V DC or AC (RMS)

Note: If the probe is open or resistance >400Ω, the display will show "OL".

3.2.6 Temperature Test

Overload protection: 600V DC or AC (RMS)

The parameter does not contain thermocouple errors.

3.2.7 Capacitance

Overload protection: 600V DC or AC (RMS)

The parameter does not contain errors caused by base capacitance and capacitance probe.

Note: To improve accuracy below 1nF, subtract the distributed capacitance of the meter and cable.

3.2.8 Diode Test

Forward DC current is approximately 1mA.

Backward DC voltage is approximately 3.2V.

Overload protection: 600V DC or AC (RMS)

Note: The meter displays an approximation of the diode forward voltage drop.

If the probe has reverse connection or is open, the LCD will show "OL".

4. Operating Guidance

4.1 Reading Hold Function

To hold a reading, press the “LPF/HOLD” key. The display value will be locked. Pressing it again cancels the hold state.

4.2 50Hz/60Hz Current Selection Function

In current mode, press and hold the “LPF/HOLD” key for more than 2 seconds to enter the LPF (50Hz/60Hz) current measurement mode.

4.3 Maximum/Minimum Measurement Function

1. Press the “MAX/MIN” key to enter MAX mode to display the maximum measured value. Pressing it again enters MIN mode for the minimum value. Pressing it repeatedly cycles through these modes.
2. Pressing and holding the “MAX/MIN” key for more than 2 seconds restores the meter to normal measuring range.

Note: When in MAX/MIN mode, the meter is in manual range mode. When in temperature measurement state, MAX/MIN mode cannot be selected.

4.4 Function Selection Function

• In resistance mode, press the “FUNC/ZERO” button to cycle through resistance, diode, and continuity detection.
• In voltage mode, press the “FUNC/ZERO” button to switch between AC and DC voltage measurement.
• In temperature mode, press the “FUNC/ZERO” button to switch between Celsius (°C) and Fahrenheit (°F).

4.5 Current Clearing Function

In current mode, press and hold the “FUNC/ZERO” key for more than 2 seconds to clear the displayed current value.

4.6 Automatic Power-Off

1. If no operation is performed for 30 minutes after turning the meter on, it enters a suspended state and powers off automatically to save battery. The buzzer will sound five times before shutdown.
2. After automatic power-off, press the “FUNC/ZERO” key to turn the meter back on.
3. Holding the “FUNC/ZERO” key while powering on will cancel the automatic power-off function.

4.7 Measurement Preparation

1. Turn the transfer switch to power on the meter. When battery voltage is low (approx. 2.4V), the LCD displays the [battery undervoltage symbol]. Replace the battery.
2. The [input limit symbol] symbol indicates that input voltage or current should not exceed the specified value to protect internal lines.
3. Set the transfer switch to the required measuring function and range.
4. When connecting test leads, connect the common test line first, then the charged test line. When removing, remove the charged test line first.

4.8 Current Measurement

⚠️ Warning: Electric shock hazard. Remove probes when measuring with the current clamp.

1. Set the measuring switch to position A for AC current measurement. Choose the appropriate measuring range.
2. Hold the trigger, open the clamp head, and clip it around one conductor of the circuit to be tested.
3. Read the current and frequency value on the LCD display.

Notes:

• Clamping two or more conductors simultaneously will result in incorrect measurements.
• For accurate readings, position the conductor at the center of the current clamp.
• The [current limit symbol] indicates that the maximum input AC current is 150A.

Do not touch or hold the position over the protective barrier when measuring current.

4.9 Voltage Measurement

⚠️ Warning: Electric shock hazard. Pay special attention to avoid shock when measuring high voltage. Do not input voltage exceeding 600V DC or AC (RMS).

1. Insert the black probe into the “COM” jack and the red probe into the “INPUT” jack. Choose the appropriate measuring range.
2. Set the measuring switch to position V≈ for AC Voltage measurement. To measure DC Voltage, press the “FUNC/ZERO” button to enter DC Voltage measurement state.
3. Connect the probes in parallel to the voltage source or both ends of the load.
4. Read the voltage and frequency on the LCD.

Notes:

• In small voltage ranges, readings may fluctuate when the probe is not connected to the circuit due to high sensitivity. Actual measured values are obtained when connected.
• Automatic measuring range is invalid in relative measurement mode.
• The [input limit symbol] indicates that the maximum input voltage is 600V DC or AC (RMS).
• If readings exceed 600V DC or AC (RMS), the meter will emit a [beep alarm symbol].

4.10 Resistance Measurement

⚠️ Warning: Electric shock hazard. Ensure the power supply is disconnected and capacitors are discharged before measuring circuit impedance.

1. Insert the black probe into the “COM” jack and the red probe into the “INPUT” jack.
2. Set the measuring switch to position Ω.
3. Connect the probes to the resistor or circuit to be tested.
4. The LCD will show the readings.

Notes:

• When the input is open, the LCD shows "OL".
• For resistances greater than 1MΩ, readings may stabilize after a few seconds.

4.11 Diode Measurement

1. Insert the black probe into the “COM” jack and the red probe into the “INPUT” jack.
2. Set the measuring switch to position ➔.
3. Press the “FUNC/ZERO” key to switch to the measuring state.
4. Connect the red probe to the diode anode and the black probe to the diode cathode for testing.
5. Read the result on the LCD.

Note: The meter displays an approximation of the diode forward voltage drop.

If the probe has reverse connection or is open, the LCD will show "OL".

4.12 Circuit Continuity Measurement

⚠️ Warning: Electric shock hazard. Ensure power supply is disconnected and capacitors are discharged before measuring circuit continuity.

1. Insert the black probe into the “COM” jack and the red probe into the “INPUT” jack.
2. Set the measuring switch to position ⏓.
3. Press the “FUNC/ZERO” key to switch to the circuit continuity measuring state.
4. Connect the probes to the circuit to be tested.
5. If the resistance is less than 50Ω, the meter's built-in buzzer may sound.
6. Read the circuit resistance value on the LCD.

Note: If the probe is open or resistance >400Ω, the display will show "OL".

4.13 Capacitance Measurement

⚠️ Warning: Electric shock hazard. Discharge capacitance completely before measuring.

1. Insert the black probe into the “COM” jack and the red probe into the “INPUT” jack.
2. Set the measuring switch to position ⨍.
3. After completely discharging the capacitance, connect the probes to the capacitor to be tested.
4. Read the capacitance on the LCD.

Note: To improve accuracy below 1nF, subtract the distributed capacitance of the meter and cable.

4.14 Temperature Measurement

1. Set the measuring switch to position TEMP.
2. Connect the negative and positive ends of a K-type thermocouple to the “COM” jack and “INPUT” jack, respectively.
3. Place the K-type thermocouple on the object or in the environment to be measured.
4. Read the measured result from the LCD display.

5. Maintenance

5.1 Replacing The Batteries

⚠️ WARNING: To avoid electric shock, ensure test leads are away from the circuit before opening the battery cover.

⚠️ WARNING: Do not mix old and new batteries. Do not mix alkaline, standard (carbon-zinc), or rechargeable (ni-cad, ni-mh, etc.) batteries.

1. If the [battery replacement symbol] appears, the batteries need replacement.
2. Loosen the fixing screw of the battery cover and remove it.
3. Replace exhausted batteries with new ones.
4. Replace the battery cover and secure it.

Note: Do not reverse the polarity of the batteries.

5.2 Replacing Test Leads

Replace test leads if they become damaged or worn.

⚠️ WARNING: Use leads that meet EN 61010-031 standard, rated CAT III 600V, MAX 10A, or better.

6. Accessories