ANENG M127 Digital Multimeter and BT138 Battery Level Detector User Manual

1. Product Overview

The ANENG M127 is a compact, portable, and multifunctional digital multimeter featuring automatic identification, a high-definition backlight, and 4000 counts. It is designed for various electrical measurements including AC/DC voltage, resistance, NCV sensing, and live/neutral line detection. The kit also includes the ANENG BT138, a mini battery level detector capable of testing a wide range of 1.2V to 4.8V batteries.

Figure 1: ANENG M127 Digital Multimeter and BT138 Battery Level Detector Kit

Product Features:

• M127 Digital Multimeter:
  • High-definition Backlight for clear readings in low light.
  • Automatic Identification for simplified operation (no manual range selection).
  • Compact and portable design with a waist design for comfortable grip.
  • 4000 Counting display.
  • True RMS measurement.
  • NCV (Non-Contact Voltage) Induction Tester.
  • Live/Neutral Line detection.
  • On-off beep (continuity test).
  • Data retention function.
  • Flashlight for illumination.
  • Back support frame for hands-free use.
• BT138 Battery Level Detector:
  • Digital display screen for clear voltage readings.
  • Measures 1.2V~4.8V batteries (D, C, AA, AAA, 9V, button, lithium 18650, 26650, 21700, 14500).
  • Compact and mini magnetic design for easy and accurate testing.
  • No external power required; powered by the tested battery.

2. Safety Information

Please read and understand all safety warnings and operating instructions before using this instrument. Failure to follow these instructions may result in electric shock, fire, or serious injury.

• Always ensure the instrument is in good working condition before use. Inspect test leads for any damage.
• Do not touch the probes directly with your hands during testing to avoid electric shock.
• Do not use the current and voltage ranges interchangeably to prevent damage to the instrument.
• The maximum voltage between the measuring end and the ground for M127 is 400V DC or 400V AC.
• If you do not know the magnitude of the voltage or current to be measured, start with the highest range and then select the appropriate range based on the measured value.

3. Setup

3.1 M127 Digital Multimeter Setup

1. Battery Installation:
   Open the battery cover on the back of the M127. Insert two 1.5V AAA batteries, ensuring correct polarity. Close the battery cover securely.
2. Connecting Test Leads:
   Insert the black test lead into the 'COM' (Common) port.
   Insert the red test lead into the 'INPUT' port.

Figure 2: M127 Battery and Test Lead Connection

3.2 BT138 Battery Level Detector Setup

The BT138 does not require separate battery installation as it is powered by the battery being tested. Ensure the positive and negative terminals of the detector make proper contact with the battery terminals.

4. Operating Instructions

4.1 M127 Digital Multimeter Operation

1. Power On/Off:
   Press the power button () to turn the multimeter on. The device will automatically enter auto-identification mode. Press and hold the power button to turn it off.
2. Automatic Identification:
   The M127 features automatic identification, meaning you do not need to manually select the measurement range for basic functions like voltage and resistance. Simply connect the probes to the circuit, and the multimeter will automatically detect the type of measurement and display the value.
3. AC Voltage Measurement:
   Connect the test leads to the AC voltage source. The multimeter will automatically detect and display the AC voltage (Unit: V). The auto range is 1V~400V.


Figure 3: Measuring AC Voltage

4. DC Voltage Measurement:
   Connect the test leads to the DC voltage source (e.g., a battery). The multimeter will automatically detect and display the DC voltage (Unit: V). The auto range is 0.6V~400V.

Figure 4: Measuring DC Voltage
5. Resistance Measurement:
   Connect the test leads across the component to measure resistance. The multimeter will automatically detect and display the resistance (Unit: Ω). The auto range is 0Ω~40MΩ.


Figure 5: Measuring Resistance

6. On-off Beep (Continuity Test):
   Connect the test leads across the circuit or component. If there is continuity, the multimeter will emit an audible beep. No sound indicates an open circuit or high resistance.


Figure 6: Continuity Test

7. NCV (Non-Contact Voltage) Sensing:
   Press the 'NCV/Live' button to activate NCV mode. Place the top of the multimeter near a live wire or electrical outlet. The device will detect induced voltage and indicate its presence without direct contact.

Figure 7: NCV Sensing
8. Live/Neutral Line Detection:
   In NCV mode, use the red probe to touch the live wire. If it rings, it's the live wire. If there's no response, it's the neutral line.


Figure 8: Live/Neutral Line Detection

9. Flashlight and Backlight:
   Press the flashlight button () to turn on the flashlight for working in dark environments. Long press the backlight button () to activate the screen backlight.
10. Data Hold:
    Short press the 'H' button () to hold the current displayed value. Press again to release.

4.2 BT138 Battery Level Detector Operation

1. Battery Testing:
   Place the battery to be tested between the positive and negative terminals of the BT138. The magnetic design ensures good contact.
2. Reading the Display:
   The digital display screen will show the voltage of the tested battery. Refer to the Battery Reference Table in the Specifications section to interpret the battery level (Fully charged, Medium power, Low battery).

Figure 9: BT138 Battery Testing Examples

4.3 Product Demonstration Video

5. Maintenance

• Cleaning: Keep the device clean. Use a soft, dry cloth to wipe the surface. Do not use abrasive cleaners or solvents.
• Storage: Store the multimeter and battery tester in a dry, cool place away from direct sunlight and extreme temperatures.
• Battery Replacement (M127): When the low battery indicator appears on the M127 display, replace the two 1.5V AAA batteries promptly to ensure accurate readings.
• Long-term Storage: If the M127 multimeter will not be used for an extended period, remove the AAA batteries to prevent leakage and corrosion. The BT138 does not require battery removal as it is powered by the tested battery.

6. Troubleshooting

• M127 Not Powering On: Check if the AAA batteries are installed correctly and are not depleted. Replace if necessary.
• M127 Inaccurate Readings: Ensure test leads are properly connected and not damaged. Verify the correct measurement mode is selected (though auto-identification handles most).
• BT138 No Display: If the BT138 screen does not display a voltage, it indicates that the battery being tested is completely discharged or there is poor contact with the terminals. Ensure good contact and try testing a known good battery.
• Product Not Operating Properly / Artificial Damage: For complex issues or suspected artificial damage, refer to the support section for contact information. Proper electrical knowledge and usage are required to prevent damage.

7. Specifications

7.1 ANENG M127 Digital Multimeter Parameters

Figure 10: M127 Parameter Information

7.2 ANENG BT138 Battery Level Detector Parameters

Figure 11: BT138 Product Information

7.3 BT138 Battery Reference Table

Figure 12: BT138 Battery Reference Table

8. User Tips

• M127 Auto-Identification: Take advantage of the M127's automatic identification feature. For common measurements like voltage and resistance, simply connect the probes, and the meter will automatically select the correct range and function, saving time and reducing errors.
• BT138 Battery-Powered: Remember that the BT138 draws power from the battery it's testing. If the battery is completely dead, the BT138's screen may not light up. This is normal behavior and indicates a fully discharged battery.
• Low Light Conditions: Utilize the M127's backlight and flashlight functions when working in dimly lit areas. A long press on the backlight button will illuminate the screen, and a short press on the flashlight button will provide direct illumination.
• Hands-Free Use: The M127 includes a built-in back support frame. Extend it to prop up the multimeter on a workbench for easier viewing during prolonged use.

9. Warranty and Support

ANENG is committed to providing quality products and customer satisfaction. If you encounter any issues with your M127 Digital Multimeter or BT138 Battery Level Detector, please refer to the following guidelines:

9.1 After-Sales Questions

For any questions or concerns regarding the use of your product, please contact ANENG customer service. Our team is dedicated to providing satisfactory solutions in a timely manner.

9.2 Quality Issues

In case of quality problems not caused by 'man-made damage' during product use, repair services or refunds may be provided. For specific product damage, contact ANENG customer service to confirm and discuss solutions. Options may include replacement of spare parts, replacement of the whole machine, or a partial/full refund depending on the damage.

9.3 Replacement or Refund Request

To initiate a replacement or refund request, you may need to provide a video demonstrating the product quality problem for damage determination. Solutions will be negotiated, and appropriate actions (e.g., destroying damaged products to avoid secondary damage) will be executed.

9.4 Product Use Questions

This product is a technical tool that 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 for assistance.

9.5 Artificial Damage

The product is primarily used to detect electrical and other measurement parameters. It requires careful use and adherence to operating procedures. Pay attention to 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 to the product, it will be judged as man-made damage, which is not within the scope of after-sales service. However, you can still contact ANENG customer service to discuss potential solutions or discounts on future purchases.

Figure 13: ANENG After-Sales Support Information