ANENG M108/M107 Mini Digital Multimeter User Manual

1. Introduction

The ANENG M108/M107 is a compact, battery-powered, auto-ranging digital multimeter featuring a 4000-count LCD display. It is designed for precise measurements of various electrical parameters, making it suitable for both professional and DIY electrical tasks.

This manual provides essential information for the safe and effective use of your multimeter.

2. Safety Information

To avoid possible electrical shock, fire, or personal injury, please read all safety information carefully before use. Use the product only as specified, or the protection supplied by the product can be compromised.

• Examine the case before each use. Look for cracks or missing plastic. Carefully inspect the insulation around the terminals.
• Ensure all measurements are made within the allowable measuring range.
• Do not use the product in explosive gas, vapor environments, or in damp or wet conditions.
• When measuring voltages exceeding 36V DC or 25V AC, exercise extreme caution to avoid electric shock.
• Misuse of mode or range can lead to hazards. Always be cautious. The display will show "OL" (Overload) when the input exceeds the range.
• Low battery levels can result in incorrect readings. Replace batteries promptly when the low battery indicator appears.
• Do not make measurements when the battery compartment door is not properly closed.

3. Product Overview

The ANENG M108/M107 multimeter is designed for ease of use with a clear LCD display and intuitive controls.

Figure 1: ANENG M107 Multimeter Panel Introduction

3.1. Key Components

• LCD Liquid Crystal Display: Shows measurement readings and indicators.
• NCV Mode: Non-contact voltage detection.
• Manual Selection Function: Short press to manually select functions. Long press to exit automatic mode.
• Data Retention: Holds the current reading on the display.
• Flashlight and Backlight: Long press the H/* button to activate.
• Switch Button: Powers the device on/off.
• Bracket: A back telescopic bracket for convenient tilting during measurements.
• Red Test Pen Socket (Measure Current): For current measurements.
• Black Test Pen Socket: Common ground for all measurements.
• Red Test Pen Socket (Measuring Voltage, Resistance, etc.): For voltage, resistance, capacitance, diode, and frequency measurements.

Figure 2: Multimeter with Back Bracket Extended

Figure 3: Multimeter with Back Extension Support Frame

Figure 4: Built-in Test Pen Card Slot for convenience

3.2. Instruction Buttons

• Power Button (Red Circle): Short press to turn on and enter voltage/resistance automatic recognition mode. Long press (approx. 2 seconds) to turn off.
• H/* Button: Short press to hold the current reading (Data Hold). Long press (more than 2 seconds) to turn on the flashlight and backlight; long press again to turn them off.
• SET Button: Function switch button. Press once to cycle through functions: DCV, ACV, Resistance, Diode, Hz, DCA, ACA, AUTO. Long press for approximately 2 seconds to exit the function mode and return to voltage/resistance automatic recognition mode.
• A Button (M108 only): Current selection button. Press once to enter current measurement mode. Press again to exit and enter AUTO mode.
• NCV Button: Press once to enter non-contact induced voltage test mode. Press again to exit and enter AUTO mode.

4. Setup

4.1. Battery Installation

The multimeter requires 2 x 1.5V AAA batteries (not included). To install or replace batteries:

1. Ensure the multimeter is powered off and test leads are disconnected.
2. Locate the battery compartment on the back of the device.
3. Open the battery compartment cover.
4. Insert two AAA batteries, observing the correct polarity (+/-).
5. Close the battery compartment cover securely.

4.2. Connecting Test Leads

Always ensure test leads are properly connected before taking measurements.

• The black test lead should always be connected to the COM (Common) terminal.
• For voltage, resistance, capacitance, diode, and frequency measurements, connect the red test lead to the INPUT terminal.
• For current measurements (M108 only), connect the red test lead to the 2A terminal.

5. Operating Instructions

This multimeter offers various measurement functions. Always select the correct function and range before connecting to a circuit.

5.1. Measuring DC/AC Voltage

1. Power on the multimeter. It will automatically enter AUTO mode, which can identify AC and DC voltage.
2. Connect the red lead to the INPUT terminal and the black lead to the COM terminal.
3. Touch the probes to the correct test points of the circuit.
4. Read the measured voltage on the display.

5.2. Measuring Resistance / Continuity

1. Connect the red lead to the INPUT terminal and the black lead to the COM terminal.
2. The multimeter will automatically match the resistance measurement.
3. Touch the probes to the desired test points of the circuit.
4. Read the measured resistance on the display.
5. For continuity, if the resistance is lower than 50 Ω, the built-in beeper will sound, indicating a short circuit.

5.3. Diode Test (M108 only)

1. Connect the red lead to the INPUT terminal and the black lead to the COM terminal.
2. Press the SET button to cycle to the DIODE mode.
3. Connect the red test lead to the anode and the black test lead to the cathode of the diode.
4. The screen will display the forward voltage drop of the diode.

5.4. NCV (Non-Contact Voltage) Detection

1. Press the NCV button once to enter NCV mode.
2. Move the top end of the multimeter close to the AC voltage source.
3. The built-in beeper will sound when AC voltage is detected. The stronger the voltage, the quicker the beeper sounds and the central LED light will flash more rapidly.

Figure 5: NCV non-contact induced voltage detection

Figure 6: NCV induced voltage detection near a power outlet

5.5. Measuring Capacitance (M108 only)

1. Connect the black test lead to the COM terminal and the red test lead to the INPUT terminal.
2. Press the SET button to cycle to the Capacitance mode.
3. Connect the red probe to the positive side and the black probe to the negative side of the capacitor.
4. Read the measured capacitance value on the display once the reading stabilizes.

5.6. Measuring Current (M108 only)

1. Press the A button or SET button to select the current mode (DCA or ACA). Note: For M108, AC/DC current can be automatically identified in AUTO mode if the current exceeds 10mA.
2. Connect the black test lead to the COM terminal and the red test lead to the 2A terminal.
3. IMPORTANT: To measure current, the multimeter must be connected in series with the circuit. Do NOT connect the multimeter directly across a voltage source in current mode, as this will burn out the instrument.
4. Touch the probes to the correct test points in series with the circuit.
5. Read the measured current on the display.
6. If measuring current over 1A, the testing time should be less than 3 seconds.

Figure 7: Correct (series) and incorrect (parallel) methods for AC current measurement.

5.7. Measuring Frequency (M108 only)

1. Connect the black test lead to the COM terminal and the red test lead to the INPUT terminal.
2. Press the SET button to cycle to the Frequency mode.
3. Contact the probes with the test point to be measured.
4. The measured frequency values will be displayed on the screen.

Figure 8: Visual guide for various measurements including AC/DC voltage, resistance, capacitance, diode, and continuity.

5.8. Flashlight and Backlight Function

Long press the H/* button to turn on the flashlight and backlight. This feature is useful for working in dimly lit environments.

Figure 9: Multimeter with screen backlight and flashlight activated.

6. Specifications

6.1. General Specifications (M108 & M107)

6.2. Electrical Specifications (M108)

6.3. Electrical Specifications (M107)

7. Maintenance

7.1. General Care

• Keep the multimeter clean and dry. Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
• Store the multimeter in a stable environment, away from extreme temperatures and humidity.
• The multimeter features an anti-drop silicone shell material for protection against damage.

Figure 10: Multimeter with anti-drop silicone shell material.

7.2. Battery Replacement

When the low battery indication appears on the display, replace the batteries immediately to ensure accurate readings. Refer to section 4.1 for battery installation instructions.

7.3. Test Leads

The multimeter comes with high-quality PVC test leads with stainless steel needles for good conductivity and durability. Inspect test leads regularly for any signs of damage or wear.

Figure 11: High quality PVC test leads.

8. Troubleshooting

If you encounter issues with your multimeter, consider the following:

• Product not operating properly: If the product is not functioning as expected, ensure batteries are correctly installed and charged. Verify that the test leads are securely connected to the correct terminals.
• Incorrect readings: Check battery level; low batteries can cause inaccurate measurements. Ensure the correct measurement mode is selected for the task.
• No display or partial display: Check battery connections and charge. If the issue persists, contact customer support.
• No NCV detection: Ensure the NCV button is pressed and the multimeter's top end is close enough to the AC voltage source.

For more complex issues or if the product is not operating normally, it is recommended to contact ANENG customer service for assistance. They can provide detailed video guidance or further support.

9. User Tips

• Always start with the AUTO mode for general voltage and resistance measurements for convenience.
• Utilize the data hold function (short press H/*) to freeze readings on the display, especially when working in awkward positions.
• The flashlight and backlight (long press H/*) are invaluable when working in poorly lit areas.
• Remember to connect the multimeter in series when measuring current to prevent damage.
• For non-contact voltage detection, ensure the top of the multimeter is pointed towards the potential AC source.

10. Warranty and Support

10.1. Limited Warranty

Customers enjoy a one-year warranty from the date of purchase. This warranty does not cover:

• Fuses or disposable batteries.
• Damage from misuse, accident, neglect, alteration, contamination, or abnormal operating conditions.
• Failures caused by use outside of the product's specifications.
• Normal wear and tear of mechanical components.

10.2. Product Use and Technical Support

This brand product is a technical product and requires a certain degree of electrical knowledge. If you encounter operational problems or do not understand how to use the product, please contact ANENG customer service. They will provide assistance and solutions in a timely manner.

For detailed instructions and documents, you may refer to the official user manual PDF: ANENG M108/M107 User Manual (PDF)

10.3. After-Sales Questions

ANENG's professional after-sales team is available to assist you with any questions or issues regarding your product.

• Contact Us: If you have any problems during the use of the product, please contact ANENG customer service.
• Quality Issues: In case of quality problems other than "man-made damage," replacement services or refunds can be provided. For specific product damage, contact ANENG customer service to confirm and discuss solutions.
• Replacement/Refund Request: Contact customer service to provide feedback, product quality problem videos for damage determination, negotiate a solution, or execute the solution.
• Product Not Operating Properly: If there is any problem during the use of the product, provide a detailed video of the product not operating normally to ANENG customer service.
• Artificially Damaged Products: This product requires careful use. Pay attention to operating procedures, select the correct measurement method, and avoid dangerous events. If the customer uses the product improperly and the use method is not equal, resulting in damage, it will be judged as man-made damage, which is not within the scope of after-sales service.

Figure 12: ANENG After-Sales Support Guidelines.