1. Overview
The ANENG 621A is an intelligent digital smart multimeter designed for professional and DIY electrical measurements. It features a smart touch screen, automatic function and range selection, and comprehensive overload protection. This manual provides detailed instructions for safe and effective use of your multimeter.
Key Features:
- Smart Touch Screen with VA color reverse display
- Automatic selection of measurement functions and ranges
- Full-scale overload protection
- Maximum LCD display value: 9999 digits
- Polarity indication: Automatic indication ('-' for negative polarity)
- Overrange display: 'OL' or '-OL'
- Sampling time: Approximately 3 times per second
- Auto shutdown time: 15 minutes of no operation
- Rechargeable 3.7V/600mAh lithium battery
- Operating temperature: 0°C - 40°C
- Durable silicone protective case for shockproof and anti-scratch protection
- Built-in flashlight for illumination in dark environments
2. Setup and Initial Use
2.1 Unboxing and Accessories
Upon opening the package, ensure all accessories are present. The standard package includes:
- ANENG 621A Smart Multimeter
- Test leads (red and black)
- Temperature line
- Charging cable (Type-C)
- User manual
- Color box packaging
2.2 Charging the Multimeter
The ANENG 621A is equipped with a rechargeable lithium battery. Use the provided Type-C charging cable to charge the device. Connect the cable to the multimeter's charging port and a suitable USB power source (e.g., a wall adapter or power bank).
2.3 Connecting Test Leads
Before taking any measurements, ensure the test leads are correctly connected to the multimeter. The red lead connects to the positive (+) input jack, and the black lead connects to the common (COM) input jack.
2.4 Power On/Off
To power on the multimeter, press and hold the power button (usually marked with a power symbol) for 2 seconds. A single press (1 second) will boot the device. To power off, long press the power button. The device also features an automatic shut-down after 15 minutes of no operation to save power.
3. Operating Instructions
The ANENG 621A features a smart touch screen and automatic function identification, simplifying measurements. The main display shows the measured value, while the bottom row of touch buttons allows for function selection and mode changes.
3.1 Automatic Measurement Mode
In 'AUTO' mode, the multimeter automatically identifies the type of measurement (voltage, resistance, capacitance, etc.) and selects the appropriate range. Simply connect the test leads to the circuit or component you wish to measure.
3.2 Specific Measurement Functions
Resistance Measurement: The multimeter automatically identifies resistance when test leads are connected across a resistor. The display will show the resistance value in Ohms (Ω), kilo-Ohms (kΩ), or Mega-Ohms (MΩ).
Figure 5: Example of resistance measurement. Capacitance Measurement: The multimeter can automatically measure capacitance. Important: Before measuring capacitance, ensure the capacitor is fully discharged to prevent damage to the multimeter.
Figure 6: Example of capacitance measurement. Diode Test: Use the touch screen button to switch to diode test mode. Connect the test leads across the diode to measure its forward voltage drop. A good diode will show a voltage reading, while a bad one will show 'OL' or a very low reading.
Figure 7: Diode test in progress. On-Off Detection (Continuity): In this mode, the multimeter will emit a beep if there is continuity (low resistance) between the test leads. This is useful for checking if a wire is broken or a switch is working.
Figure 8: On-off detection (continuity) test. DC Voltage Measurement: The multimeter automatically identifies DC voltage. Connect the test leads in parallel across the DC voltage source. The display will show the DC voltage value.
Figure 9: Example of DC voltage measurement. AC Voltage Measurement: The multimeter automatically identifies AC voltage. Connect the test leads in parallel across the AC voltage source. The display will show the AC voltage value and frequency.
Figure 10: Example of AC voltage measurement. Temperature Measurement: Connect the temperature line (thermocouple) to the multimeter. The screen will display the measured temperature in Celsius (°C) and Fahrenheit (°F) simultaneously.
Figure 11: Temperature measurement using the provided probe. NCV (Non-Contact Voltage) Sensing: The built-in NCV sensor detects the presence of AC voltage without direct contact. When a power supply is detected, the red index bar on the screen flashes high, and the frequency of the alarm buzzer increases with signal strength.
Figure 12: NCV Power Sensing in action. Live Detection (Fire/Zero Line Discrimination): Use the NCV/Live button to switch to Live detection. Insert the red test lead into the socket. If it's the live wire (FireWire), the screen will show a strong signal and a fast beeping sound. If it's the neutral wire (Zero line), the green signal bar will be low or no signal, and the buzzer sound will be slow or absent.
Figure 13: Distinguishing live and neutral lines. DC Current Measurement: To measure DC current, connect the test leads in series with the circuit. The multimeter will automatically select the appropriate range (999.9mA/10A). Ensure the circuit is off before connecting the multimeter in series, then turn it on for measurement.
Figure 14: Example of DC current measurement on an LED strip. AC Current Measurement: Similar to DC current, connect the test leads in series with the AC circuit. The multimeter will automatically select the appropriate range (999.9mA/10A). Always ensure the circuit is off before connecting the multimeter in series.
Figure 15: Example of AC current measurement on a light bulb circuit. Flashlight: The multimeter has a built-in flashlight to illuminate dark work areas. Press the flashlight button to turn it on/off.
Figure 16: Using the multimeter's flashlight.
3.3 Important Precaution for Current Measurement:
Current must always be measured in series with the circuit.
When measuring electric current, always connect the multimeter in series. If you are unsure of the current value, choose an appropriate higher range. Incorrect connection (e.g., in parallel) can damage the multimeter or the circuit. If the multimeter displays "1", it indicates an overrange condition. Disconnect the red test pen from the current input hole, then reconnect the red and black test pens in series to the measuring circuit.
4. Maintenance
4.1 General Care
- Keep the multimeter clean and dry. Wipe the casing with a damp cloth; do not use abrasive cleaners or solvents.
- Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- The silicone protective case helps prevent damage from drops and scratches. Ensure it is properly fitted.
- The test leads have removable protective dust caps. Keep them on when not in use to prevent arc creepage and accidental bending of leads.
4.2 Battery Maintenance
The multimeter uses a rechargeable lithium battery. Charge it regularly to maintain battery health. If the device is not used for an extended period, charge it periodically to prevent deep discharge.
5. Troubleshooting
5.1 Millivolt Value Jump / Non-Zero Phenomenon
The mV (millivolt) file of the multimeter may sometimes show a non-zero phenomenon, mainly due to:
- Excessive changes in ambient temperature and humidity in the air.
- Strong electric field or magnetic field interference.
If the multimeter does not return to zero, you can check it as follows: Dial the multimeter to the mV file, insert the corresponding input hole into the red and black test lead, and short-circuit the red and black test lead. At this time, the multimeter should display "0000". This non-zero return is usually due to environmental factors and does not affect the use of the multimeter. However, it is recommended to eliminate environmental interference factors to ensure measurement accuracy and prevent erroneous results.
5.2 Multimeter Not Turning On
- Ensure the battery is charged. Connect the multimeter to a charger and check if the charging indicator lights up.
- Press and hold the power button for at least 2 seconds to ensure it powers on correctly.
5.3 Inaccurate Readings
- Check if the test leads are properly connected and not damaged.
- Ensure the measurement mode is appropriate for the component/circuit being tested.
- Verify that environmental factors (temperature, humidity, strong electromagnetic fields) are not interfering with the measurement.
- For capacitance, ensure the capacitor is fully discharged before measurement.
6. Specifications
| Feature | Range | Resolution | Accuracy |
|---|---|---|---|
| DC Voltage | 999.9mV/9.999V/99.99V/999.9V | 0.1mV~0.1V | ±(0.5% reading + 3 digits) |
| AC Voltage | 999.9mV/9.999V/99.99V/999.9V | 0.1mV~0.1V | ±(0.8% reading + 5 digits) |
| DC Current | 999.9mA/10A (Min 20mA/Max 10A) | 1mA~0.01A | ±(1.0% reading + 5 digits) |
| AC Current | 999.9mA/10A (Min 20mA/Max 10A) | 1mA~0.01A | ±(1.0% reading + 8 digits) |
| Resistance | 999.9Ω/9.999kΩ/99.99kΩ/999.9kΩ/9.999MΩ/99.99MΩ | 0.1Ω~0.01MΩ | ±(0.8% reading + 3 digits) |
| Capacitance | 9.999nF/999.9nF/9.999uF/99.99uF/999.9uF/9.999mF/99.99mF | 0.001nF~0.01mF | ±(2.5% reading + 20 digits) |
| Frequency (AC gear) | 40Hz~1000Hz | 0.1Hz~1Hz | ±(1.0% reading + 5 digits) |
| Temperature (°C) | -40~1000°C | 1°C | ±(1% reading + 3°C) |
| Temperature (°F) | -40~1832°F | 1°F | ±(1% reading + 3°F) |
| Diode Test | -- | -- | 1V |
| Line On-Off Test | -- | -- | 0.1Ω |
General Specifications:
- Max Display: 9999 Counts
- Operating Mode: Manual Range
- Battery Type: Lithium battery (rechargeable)
- Product Material: ABS
- Wire Material: PVC/Brass
- Total Wire Length: 90cm/35.4in
- Weight: 162g
- Product Size: 133*66.5*22.5mm / 5.23in*2.62in*0.88in
- Certification: CE
- Is Smart Device: No
- Battery Included: Yes
- High-concerned chemical: None
- Diode: Yes
- Data Retention: Yes
- Flashlight: Yes
- Reverse Display: Yes
- Smart Anti-burn: Yes
- Live Detection: Yes
- Silicone Sheath: Yes
- On-OFF Detection: Yes
- NCV Sensing: Yes
7. User Tips
- Always prioritize safety: Before any measurement, especially involving live circuits, ensure you understand the circuit and the multimeter's capabilities.
- Readings in dark environments: Utilize the built-in flashlight for better visibility when working in dimly lit areas.
- Capacitor discharge: Always discharge capacitors before measuring their capacitance to prevent damage to the multimeter.
- Current measurement: Remember to connect the multimeter in series for current measurements. If you are unsure of the current, start with a higher range to avoid overloading the device.
- Environmental factors: Be aware that strong electromagnetic fields or rapid changes in temperature/humidity can sometimes affect measurement accuracy, particularly for very low voltage readings (mV range).
8. Warranty and Support
For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.
9. Product Demonstration Video
Watch this video for a visual guide on the ANENG 621A Smart Multimeter's features, unboxing, charging, and various measurement functions.
