MASTFUYI Digital Clamp Meter Multimeter User Manual

1. Introduction

The MASTFUYI Digital Clamp Meter Multimeter is a versatile and high-precision instrument designed for electrical measurements. It features True RMS technology, intelligent anti-burn protection, and a wide range of functions including AC/DC current and voltage, resistance, capacitance, frequency, duty cycle, temperature, continuity, diode testing, NCV detection, and live wire recognition. This manual provides essential information for safe and effective use of your clamp meter.

Image: MASTFUYI Digital Clamp Meter Multimeter highlighting its features.

2. Safety Information

▲ WARNING

Special care should be taken when using this meter as improper use may result in electric shock or damage to the meter. The usual safety procedures should be followed and the safety measures specified in this instruction manual should be fully observed during use.

This instrument is designed and manufactured in accordance with the safety requirements for electronic measuring instruments and hand-held digital multimeters as per the International Electrotechnical Safety Standard IECI 61010. The instrument conforms to GB/T13978-92 general technical conditions for digital multimeters, and GB4793.1-1995 (IEC-61010-1) safety requirements for electronic measuring instruments, which is a level 2 pollution, and the over-voltage standard is CAT III 600V.

2.1 Safety Instructions

• For your personal safety, use the test pens supplied with the meter. Check and make sure they are intact before use.
• Do not use the meter when the meter or the meter pen has a damaged appearance.
• The safety functions provided by the meter may become ineffective if the meter is not used correctly.
• Extreme care must be taken when working around exposed conductors or buses.
• It is prohibited to use the meter near explosive gases, vapors, or dust.
• The correct input, function, and range must be used for measurement.
• Do not exceed the input limits specified for each range to prevent damage to the meter.
• Do not touch unused inputs when the meter is connected to the line under test.
• When the measured voltage exceeds 60V DC or 30V AC RMS, operate carefully to prevent electric shock.
• When measuring with the test pen, place your fingers behind the guard ring of the test pen.

2.2 Safety Symbols

Symbols used on the meter body and in the instruction manual:

• ▲ WARNING: Important safety symbols, refer to the instruction manual before use. Incorrect use can result in damage to the device or its components.
• ~: AC (alternating current)
• ---: DC (Direct Current)
• ~---: Alternating current or direct current
• ⏚: Grounding

3. Product Features

The MASTFUYI Digital Clamp Meter offers a robust set of features for professional and DIY electrical work:

• Multi-Function Testing: Capable of measuring AC/DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Duty Cycle, Temperature, Continuity, and Diode.
• True RMS: Provides accurate readings for non-sinusoidal waveforms.
• High Precision: Up to 6000 counts display for enhanced measurement accuracy.
• Intelligent Anti-Burn Protection: Full-range smart protection prevents damage from misconnections, ensuring safety during testing.
• NCV Detection & Live Wire Recognition: Non-Contact Voltage (NCV) detection and live wire identification for safe and easy testing.
• High Voltage Red Alarm: The screen turns red when measuring high voltage, providing a clear visual warning.
• Large Clamp Jaw: 25mm/26mm clamp jaw opening for versatile usage on various wire sizes.
• User-Friendly Design: Features non-slip knobs, silicone buttons, a clear LCD display, data hold function, and a bright flashlight for working in low light conditions.
• Auto Power Off: Conserves battery life by automatically turning off after a period of inactivity.

Image: Intelligent Anti-Burn Protection for safe usage.

4. Functional Identification

Familiarize yourself with the components of your clamp meter:

Image: Functional Identification & Key Components Guide (FY211D).

1. NCV Sensing Antenna: Used for Non-Contact Voltage detection.
2. Clamp: Opens to enclose a single conductor for current measurement.
3. Flashlight: Illuminates the work area.
4. Function Selector Rotary Switch: Selects the desired measurement function.
5. Clamp Trigger: Press to open the clamp head.
6. Zero Reset / Flashlight Button: Used for zero calibration and activating the flashlight.
7. Data Hold / Backlight Button: Holds the current reading on the display and controls the backlight.
8. Function Selector Button (SEL): Toggles between different functions within a rotary switch position (e.g., AC/DC, Resistance/Continuity).
9. LCD Display: Shows measurement readings and indicators.
10. COM Jack: Common input terminal for test leads (black).
11. INPUT Jack: Positive input terminal for test leads (red).

5. Operating Instructions

Before operating, ensure the meter is in good condition and test leads are properly connected. Always select the correct function and range before making measurements.

5.1 General Operation

1. Power On/Off: Rotate the Function Selector Rotary Switch from 'OFF' to any desired measurement function to turn on the meter. Rotate back to 'OFF' to power off. The meter also features auto power off after approximately 15 minutes of inactivity.
2. Function Selection: Use the Function Selector Rotary Switch to choose the primary measurement mode (e.g., V~ for AC Voltage, A~ for AC Current). For modes with multiple functions (e.g., Resistance, Continuity, Diode), press the 'SEL' button to cycle through them.
3. Data Hold: Press the 'HOLD' button to freeze the current reading on the display. Press again to release.
4. Backlight: Press and hold the 'HOLD' button to turn the backlight on/off.
5. Flashlight: Press the Flashlight button to turn the flashlight on/off.
6. Zero Calibration: For certain measurements (e.g., DC current), press the 'ZERO' button to zero the display before measurement.

5.2 Measurement Modes

Here are common measurement procedures:

AC Current Test

1. Rotate the Function Selector to the AC Current (A~) position.

2. Press the clamp trigger to open the clamp jaw.

3. Enclose only one current-carrying conductor within the clamp head. Ensure the conductor is centered for accurate readings.

4. Read the AC current value on the LCD display.

Image: AC/DC Current Measurement with 26mm Clamp Jaw.

DC Current Test

1. Rotate the Function Selector to the DC Current (A---) position.

2. Press the clamp trigger to open the clamp jaw.

3. Enclose only one current-carrying conductor within the clamp head. Ensure the conductor is centered for accurate readings.

4. Read the DC current value on the LCD display.

AC Voltage Test

1. Insert the red test lead into the INPUT jack and the black test lead into the COM jack.

2. Rotate the Function Selector to the AC Voltage (V~) position.

3. Connect the test leads across the circuit or component to be measured.

4. Read the AC voltage value on the LCD display. The High Voltage Red Alarm will activate if voltage is high.

Image: High Voltage Red Alarm during AC Voltage measurement.

DC Voltage Test

1. Insert the red test lead into the INPUT jack and the black test lead into the COM jack.

2. Rotate the Function Selector to the DC Voltage (V---) position.

3. Connect the test leads across the circuit or component to be measured, observing polarity.

4. Read the DC voltage value on the LCD display.

Resistance Test

1. Insert the red test lead into the INPUT jack and the black test lead into the COM jack.

2. Rotate the Function Selector to the Resistance (Ω) position. Press 'SEL' if needed to select Resistance.

3. Ensure the circuit is de-energized. Connect the test leads across the component.

4. Read the resistance value on the LCD display.

Continuity Test

1. Insert the red test lead into the INPUT jack and the black test lead into the COM jack.

2. Rotate the Function Selector to the Continuity (Ω) position. Press 'SEL' until the continuity symbol (buzzer icon) appears.

3. Ensure the circuit is de-energized. Connect the test leads across the component.

4. If resistance is less than 50Ω, the buzzer will sound, indicating continuity.

Diode Test

1. Insert the red test lead into the INPUT jack and the black test lead into the COM jack.

2. Rotate the Function Selector to the Diode (Ω) position. Press 'SEL' until the diode symbol appears.

3. Ensure the circuit is de-energized. Connect the red test lead to the anode and the black test lead to the cathode of the diode.

4. Read the forward voltage drop on the LCD display.

Capacitance Test

1. Insert the red test lead into the INPUT jack and the black test lead into the COM jack.

2. Rotate the Function Selector to the Capacitance (mF) position.

3. Ensure the capacitor is discharged before testing. Connect the test leads across the capacitor.

4. Read the capacitance value on the LCD display.

Frequency / Duty Cycle Test

1. Insert the red test lead into the INPUT jack and the black test lead into the COM jack.

2. Rotate the Function Selector to the Frequency (Hz) position. Press 'SEL' to toggle between Frequency and Duty Cycle.

3. Connect the test leads across the signal source.

4. Read the frequency or duty cycle value on the LCD display.

Temperature Test

1. Insert the temperature probe into the INPUT and COM jacks (observing polarity if applicable).

2. Rotate the Function Selector to the Temperature (°C/°F) position.

3. Place the probe on/in the object whose temperature is to be measured.

4. Read the temperature on the LCD display.

NCV (Non-Contact Voltage) Test

1. Rotate the Function Selector to the NCV position.

2. Bring the NCV sensing antenna (top of the clamp head) close to the conductor or outlet.

3. The meter will indicate the presence of AC voltage with an audible beep and visual indication (EF on display, changing frequency grunt).

Image: NCV Detection & Live Wire Recognition for safe testing.

Live Wire Test

1. Insert the red test lead into the INPUT jack.

2. Rotate the Function Selector to the Live Wire (LIVE) position.

3. Touch the red test lead to the live wire or live terminal of an outlet.

4. The meter will display 'H' and emit an alarm sound for a live wire. No response for a neutral line.

5.3 Operation Demonstration Video

Video: A demonstration of various measurement functions including AC/DC current, voltage, frequency, duty cycle, live wire, NCV, continuity, resistance, diode, capacitance, and temperature tests.

6. Specifications

6.1 General Specifications

6.2 Measurement Ranges and Accuracy (Model FY211D)

Image: Specification Comparison of FY211A, FY211C & FY211D (for detailed model differences).

7. Meter Maintenance

This section provides basic maintenance information, including instructions for replacing batteries. Do not attempt to service the meter unless you are an experienced service person and have the relevant calibration, performance testing, and maintenance information.

7.1 General Maintenance

▲ WARNING

To avoid electric shock or damage to the meter, do not wet the inside of the meter. Before opening the case or battery cover, the test pens and input signal connections must be removed.

• Periodically clean the instrument case with a damp cloth and a small amount of detergent; do not use abrasives or chemical solvents.
• Input jacks that are dirty or wet may affect readings.

To clean the input jacks:

1. Turn off the meter and disconnect all test pens from the input jacks.
2. Remove all dirt from the jack.
3. Clean each jack with a cotton ball moistened with a cleaner or lubricant; the lubricant prevents moisture-related jack contamination.

7.2 Replacing the Battery

▲ WARNING

To avoid erroneous readings that could result in electric shock or personal injury, the batteries should be replaced immediately when the battery symbol appears on the display while the meter is in use.

To avoid electric shock or personal injury, turn off the instrument and check that the test pen is disconnected from the measurement circuit before opening the battery cover to replace batteries.

Follow the steps below to replace the batteries:

1. Turn off power to the meter.
2. Disconnect all test pens from the input jacks.
3. Use a screwdriver to loosen the screws securing the battery cover.
4. Remove the battery cover.
5. Take away the old batteries.
6. Replace with new 2 x 1.5V AAA batteries.
7. Install the battery cover and tighten the screws.

8. User Tips

• Always double-check your function and range selection before connecting the meter to a circuit to prevent damage to the meter or inaccurate readings.
• When measuring current with the clamp, ensure only a single conductor passes through the clamp jaw for correct readings. Measuring multiple conductors will result in a zero or incorrect reading.
• Utilize the data hold function when working in hard-to-reach areas to capture the reading for later review.
• The flashlight and backlight features are very useful in dimly lit environments, improving visibility and safety.
• Remember to discharge capacitors before testing their capacitance to avoid potential damage to the meter or the component.

9. Troubleshooting

10. Warranty and Support

The accuracy of this meter is guaranteed for one year from the date of leaving the factory, provided it is used under benchmark conditions (ambient temperature 18°C to 28°C, relative humidity not greater than 80%).

For specific warranty claims, technical support, or service, please contact the seller or manufacturer directly. Always refer to the official product documentation for the most up-to-date warranty terms and conditions.

For additional guides and documents, you may refer to the official user manual PDF: User manual (PDF).