ANENG 620A Digital Multimeter User Manual

1. Introduction

The ANENG 620A is an intelligent, auto-ranging digital multimeter designed for accurate measurement of AC/DC voltage, AC/DC current, resistance, capacitance, frequency, temperature, diode, and continuity. It features a large 4.7-inch LCD display with 6000 counts and True RMS capabilities, making it suitable for professional and DIY electrical testing. This manual provides essential information for safe and effective operation of the device.

2. Safety Information

WARNING: Read all safety warnings and instructions before using this product. Failure to follow the warnings and instructions may result in electric shock, fire, or serious injury.

• Always ensure the multimeter is in the correct function mode before connecting test leads to a circuit.
• Do not exceed the maximum input values specified for each range. Maximum voltage between measurement terminal and ground is 600V DC or 600V AC.
• Exercise extreme caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC. These voltages pose a shock hazard.
• Inspect test leads for damaged insulation or exposed metal before use. Replace if damaged.
• Do not operate the multimeter if it appears damaged or if the battery cover is not properly closed.
• Remove test leads from the circuit before changing functions.
• Replace batteries immediately when the low battery indicator appears on the display.
• Do not use the multimeter in explosive atmospheres.

3. Product Overview

3.1. Device Components

The ANENG 620A Digital Multimeter features a robust design with a protective casing and a clear LCD display. Key components include the display, function buttons, input jacks, and a built-in LED lamp.

Figure 1: Front and back view of the ANENG 620A Digital Multimeter, highlighting the large LCD screen and the protective red casing.

Figure 2: Detailed front view of the ANENG 620A Digital Multimeter, showing the 4.7-inch LCD display with various measurement indicators and input terminals.

3.2. Display Features

• 4.7-inch LCD Screen: Large display for clear readings.
• 6000 Counts: High resolution for precise measurements.
• True RMS: Accurate measurement of non-sinusoidal AC waveforms.
• Auto-ranging: Automatically selects the appropriate measurement range.
• Polarity Indication: Automatic indication; "-" indicates negative polarity.
• Over-range Display: "0L" or "-0L" indicates measurement exceeds range.
• Unit Display: Shows function and quantity units.
• Low Battery Indication: LCD symbol indicates low battery voltage.

4. Setup

4.1. Battery Installation

1. Ensure the multimeter is turned off and test leads are disconnected.
2. Locate the battery compartment on the back of the device.
3. Unscrew the battery compartment cover and remove it.
4. Insert two 1.5V AAA batteries, observing the correct polarity (+/-) as indicated inside the compartment.
5. Replace the battery cover and secure it with the screw.

Note: Batteries are not included with the multimeter.

4.2. Connecting Test Leads

Always connect the black test lead to the COM (common) input jack. Connect the red test lead to the appropriate input jack based on the desired measurement:

• VHzΩmA: For voltage, frequency, resistance, capacitance, diode, continuity, and milliampere current measurements.
• 10A: For high current (up to 10A) measurements.

Figure 3: Package contents, showing the multimeter, test leads, and thermocouple.

5. Operating Instructions

The ANENG 620A features both automatic and manual measurement modes. In auto mode, the meter intelligently selects the measurement function and range. Manual mode allows for specific function selection.

5.1. General Operation

• Power On/Off: Press the power button to turn the device on or off.
• Auto Power Off: The multimeter will automatically power off after 15 minutes of inactivity to conserve battery life.
• Backlight/LED Lamp: Press the backlight button to illuminate the display or activate the built-in LED lamp for working in low-light conditions.

5.2. Measurement Functions

Connect the test leads as described in Section 4.2 before performing any measurements.

1. AC/DC Voltage Measurement:
   • Turn the rotary switch to the Voltage (V) position.
   • Connect the test leads in parallel to the circuit or component to be measured.
   • Read the voltage value on the display.
2. AC/DC Current Measurement:
   • Turn the rotary switch to the Current (A or mA) position.
   • Connect the test leads in series with the circuit.
   • Read the current value on the display.
   • CAUTION: Do not measure currents exceeding 10A.
3. Resistance Measurement:
   • Turn the rotary switch to the Resistance (Ω) position.
   • Ensure the circuit is de-energized before measuring resistance.
   • Connect the test leads across the component.
   • Read the resistance value.
4. Continuity Test:
   • Turn the rotary switch to the Continuity (Ω) position.
   • Connect the test leads across the circuit or component.
   • A continuous beep indicates continuity (low resistance).
5. Diode Test:
   • Turn the rotary switch to the Diode (→|) position.
   • Connect the red lead to the anode and the black lead to the cathode of the diode.
   • The display will show the forward voltage drop. Reverse the leads to check for open circuit.
6. Capacitance Measurement:
   • Turn the rotary switch to the Capacitance (F) position.
   • Ensure capacitors are fully discharged before testing.
   • Connect the test leads across the capacitor.
   • Read the capacitance value.
7. Temperature Measurement:
   • Turn the rotary switch to the Temperature (°C/°F) position.
   • Connect the thermocouple to the input jacks, observing polarity.
   • Place the thermocouple tip on the object to be measured.
   • Read the temperature value.
8. Frequency Measurement:
   • Turn the rotary switch to the Frequency (Hz) position.
   • Connect the test leads in parallel to the signal source.
   • Read the frequency value.
9. NCV (Non-Contact Voltage) / Live Wire Detection:
   • Select the NCV function.
   • Bring the top of the multimeter close to the conductor.
   • The device will indicate the presence of AC voltage through an audible alarm and visual indicator without direct contact.

6. Maintenance

6.1. Cleaning

Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the input terminals free from dirt and moisture.

6.2. Battery Replacement

When the low battery symbol appears on the LCD, replace the batteries immediately to ensure accurate readings. Follow the battery installation steps in Section 4.1.

6.3. Storage

If the multimeter is not used for an extended period, remove the batteries to prevent leakage. Store the device in a cool, dry place, away from direct sunlight and extreme temperatures. The recommended storage temperature is -10°C to 50°C.

7. Troubleshooting

• No Display / Faint Display: Check battery installation. Replace batteries if low battery indicator is present or if batteries are old.
• "OL" or "-0L" on Display: Indicates that the measured value exceeds the selected range or the maximum capacity of the meter. Switch to a higher range if available, or ensure the component is within the meter's limits.
• Inaccurate Readings: Ensure test leads are properly connected. Check battery level. Verify the correct function mode is selected. Ensure the circuit is de-energized for resistance/continuity measurements.
• No Continuity Beep: Check if the circuit is truly continuous. Ensure test leads are making good contact.

8. Specifications

9. Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your purchase or contact the retailer. Keep your purchase receipt as proof of purchase.

For further assistance, you may also visit the manufacturer's website or contact their customer service department.