ALRIWMINSI Aneng SZ305 Digital Multimeter User Manual

1. Introduction

This manual provides detailed instructions for the safe and effective operation of the ALRIWMINSI Aneng SZ305 Digital Multimeter. Please read this manual thoroughly before using the device and retain it for future reference. The SZ305 is a compact, professional-grade digital multimeter designed for measuring AC/DC voltage, AC/DC current, resistance, capacitance, frequency, and performing diode and continuity tests. It features a 1999-count display and smart measurement capabilities.

Figure 1: Front view of the Aneng SZ305 Digital Multimeter, showing the display, rotary dial, function buttons, and input jacks.

2. Safety Information

To ensure safe operation, observe the following safety precautions:

• Always ensure the multimeter is in good working condition before use.
• Do not apply voltage or current exceeding the maximum specified limits.
• Exercise extreme caution when working with live circuits.
• Replace batteries when the low battery indicator appears to ensure accurate readings.
• Do not operate the multimeter in explosive atmospheres.
• Refer to the specifications section for detailed measurement ranges and limits.

3. Product Components and Features

The Aneng SZ305 Multimeter includes the following key components and features:

• LCD Display: Shows measurement readings, units, and function indicators.
• Rotary Dial: Selects measurement functions (Voltage, Current, Resistance, Capacitance, etc.).
• Function Buttons: For specific operations like HOLD, RANGE, REL, etc. (refer to specific model for exact buttons).
• Input Jacks: For connecting test leads (COM, VΩmA, 10A).
• Test Leads: Red and black leads for connecting to circuits.
• Backlight: For visibility in low-light conditions.
• Auto Power Off: Conserves battery life.

Figure 2: The Aneng SZ305 Multimeter shown with its included test leads, ready for connection.

4. Setup and Initial Operation

4.1. Battery Installation

1. Ensure the multimeter is powered off.
2. Locate the battery compartment cover on the back of the device.
3. Unscrew the retaining screw(s) and remove the cover.
4. Insert the required batteries (e.g., 2x AAA or 9V, refer to the compartment label) observing correct polarity.
5. Replace the cover and secure the screw(s).

4.2. Connecting Test Leads

• Insert the black test lead into the "COM" (Common) jack.
• For most measurements (voltage, resistance, capacitance, frequency, diode, continuity), insert the red test lead into the "VΩmA" jack.
• For high current measurements (e.g., 10A), insert the red test lead into the "10A" jack. Warning: Never connect the red lead to the "10A" jack when measuring voltage or resistance.

5. Operating Instructions

5.1. Measuring DC Voltage (VDC)

1. Set the rotary dial to the "VDC" position.
2. Connect the black test lead to the negative (-) terminal of the circuit and the red test lead to the positive (+) terminal.
3. Read the voltage value on the LCD display.

5.2. Measuring AC Voltage (VAC)

1. Set the rotary dial to the "VAC" position.
2. Connect the test leads across the AC voltage source.
3. Read the voltage value on the LCD display.

5.3. Measuring Resistance (Ω)

1. Ensure the circuit is de-energized before measuring resistance.
2. Set the rotary dial to the "Ω" position.
3. Connect the test leads across the component to be measured.
4. Read the resistance value on the LCD display.

5.4. Measuring Capacitance (F)

1. Ensure the capacitor is fully discharged before measurement to prevent damage to the multimeter.
2. Set the rotary dial to the "F" (Capacitance) position.
3. Connect the test leads across the capacitor terminals.
4. Read the capacitance value on the LCD display.

Figure 3: An assortment of electronic components, such as capacitors and resistors, which can be tested with the SZ305 multimeter.

5.5. Diode Test

1. Set the rotary dial to the diode symbol (→|→).
2. Connect the red test lead to the anode and the black test lead to the cathode of the diode.
3. The display will show the forward voltage drop. Reverse the leads; the display should show "OL" (Open Loop) for a good diode.

5.6. Continuity Test

1. Set the rotary dial to the continuity symbol (♫).
2. Connect the test leads across the circuit or component.
3. A continuous beep indicates a low resistance path (continuity).

5.7. NCV (Non-Contact Voltage) Detection

1. Set the rotary dial to the "NCV" position.
2. Bring the top of the multimeter near an AC voltage source.
3. The device will indicate the presence of AC voltage through an audible beep and/or LED indicator.

6. Maintenance

6.1. Cleaning

• Wipe the device with a damp cloth and mild detergent. Do not use abrasives or solvents.
• Ensure the device is completely dry before storage or next use.

6.2. Battery Replacement

Refer to section 4.1 for battery installation instructions. Replace batteries promptly when the low battery indicator appears on the display to maintain measurement accuracy.

6.3. Fuse Replacement

If the current measurement function fails, the fuse may need replacement. This procedure should only be performed by qualified personnel.

1. Ensure the multimeter is powered off and test leads are disconnected.
2. Open the back cover (similar to battery replacement).
3. Locate the fuse(s) and carefully remove the blown fuse.
4. Replace with a fuse of the exact same type and rating (e.g., F10A/250V). Using an incorrect fuse can damage the device or pose a safety hazard.
5. Securely close the back cover.

7. Troubleshooting

8. Specifications

The following are general specifications for the Aneng SZ305 Digital Multimeter. Specific ranges and accuracies may vary slightly.

• Display: 1999 Counts LCD
• DC Voltage: Up to 1000V
• AC Voltage: Up to 750V
• DC Current: Up to 10A
• AC Current: Up to 10A
• Resistance: Up to 200MΩ
• Capacitance: Up to 20mF
• Frequency: Yes (Range not specified in input, general inclusion)
• Diode Test: Yes
• Continuity: Yes (with buzzer)
• NCV: Yes
• Power: (e.g., 2x AAA batteries or 9V battery)
• Dimensions: (Approximate, not provided in input)
• Weight: (Approximate, not provided in input)

9. Warranty and Support

This product is manufactured by ALRIWMINSI. For warranty information and technical support, please refer to the seller's policies or contact their customer service directly. Please retain your proof of purchase for any warranty claims.

Manufacturer: ALRIWMINSI

Date First Available: July 20, 2025