ANENG SZ12 Digital Multimeter User Manual

1. Introduction

The ANENG SZ12 is a high-precision, multi-range digital multimeter designed for a wide array of electrical measurements. Featuring a 20000-count display, intelligent anti-burn protection, and various functions including NCV voltage induction, AC/DC voltage and current testing, capacitance, resistance, frequency, duty cycle, diode, continuity, and temperature measurements, it is an essential tool for professionals and DIY enthusiasts alike. Its robust design includes a silicone protective cover, a back bracket, and convenient test pen storage.

2. Setup

2.1. Unpacking and Inspection

Upon receiving your ANENG SZ12 Multimeter, carefully unpack all components and inspect for any damage. The package should include:

• 1 x ANENG SZ12 Multimeter
• 1 x Packing box
• 1 x User Manual
• 1 x Temperature line (thermocouple)
• 1 x Test pen line (test leads)

2.2. Battery Installation

The ANENG SZ12 Multimeter requires two 1.5V AA batteries (not included with shipment). To install:

1. Unscrew the screw on the back cover of the multimeter.
2. Remove the battery cover.
3. Load two AA batteries, ensuring correct polarity (+/-).
4. Install the battery cover and secure the screw.

2.3. Connecting Test Leads

Connect the red test lead to the 'VΩmA' or '20A' input jack and the black test lead to the 'COM' input jack. The multimeter features an LED guide light that illuminates the corresponding jack when the watch pen plug is inserted, ensuring correct connection.

2.4. Physical Features

• Silicone Protective Cover: Provides anti-drop protection.
• Back Bracket: Adjustable stand for tilting the multimeter on a table.
• Hanging Hole/Strong Magnet: Allows the multimeter to be adsorbed on any iron plate or fixed with a hanging hole during measurement, freeing your hands.
• Snap-on Pen Storage: Convenient storage for test pens, easy to carry.

3. Operating Instructions

The ANENG SZ12 features an auto-ranging function for most measurements, simplifying operation. Use the Function Turntable to select the desired measurement mode.

3.1. Power On/Off and Display

• Power On: Turn the Function Turntable from 'OFF' to any measurement mode.
• Power Off: Turn the Function Turntable to 'OFF'. The device also features an Automatic Shutdown after 15 minutes of inactivity to save power.
• LCD Backlight: Short press the backlight/flashlight button to turn on the LCD backlight for clear visibility in dim environments.
• Flashlight: Long press the backlight/flashlight button to turn on/off the flashlight, useful for working in dark areas.
• Data Retention (HOLD): Short press the 'HOLD' button to lock/unlock the current displayed data.
• MAX/MIN: Long press the 'MAX/MIN' button to display the maximum or minimum measured value. Short press to toggle between MAX/MIN functions.

3.2. Voltage Measurement (DC/AC)

1. Turn the Function Turntable to the 'V' (Voltage) position.
2. Press the 'FUNC' button to switch between DC Voltage (VDC) and AC Voltage (VAC) modes if necessary.
3. Connect the test leads in parallel to the circuit or component being measured.
4. Read the voltage value on the display. For DC voltage, you can measure directly from power supplies or batteries. For AC voltage, measure from wall outlets or AC sources.

3.3. Current Measurement (DC/AC)

Important: Current measurement requires connecting the multimeter in series with the circuit. Ensure the circuit is de-energized before connecting the leads.

1. Turn the Function Turntable to the 'mA' or '20A' position depending on the expected current.
2. Press the 'FUNC' button to switch between DC Current (mA/A DC) and AC Current (mA/A AC) modes.
3. Connect the red test lead to the appropriate current input jack (μA mA or 20A) and the black test lead to 'COM'.
4. Break the circuit and connect the multimeter in series.
5. Re-energize the circuit and read the current value.

3.4. Resistance Measurement

1. Turn the Function Turntable to the 'Ω' (Resistance) position.
2. Ensure the circuit is de-energized and the component is isolated.
3. Connect the test leads across the component to measure its resistance.
4. Read the resistance value on the display. The multimeter features auto-ranging for convenience and high precision with four decimal places.

3.5. Continuity Test (On-Off Beep)

1. Turn the Function Turntable to the 'Ω' (Resistance) position.
2. Press the 'FUNC' button until the continuity symbol (a speaker icon) appears on the display.
3. Connect the test leads across the circuit or component.
4. If there is continuity (low resistance), the multimeter will emit an audible beep.

3.6. Diode Test

1. Turn the Function Turntable to the 'Diode' symbol position.
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 to check for reverse bias.

3.7. Capacitance Measurement

Important: Always discharge capacitors before testing to avoid damage to the multimeter or injury.

1. Turn the Function Turntable to the 'Capacitor' symbol position.
2. Discharge the capacitor using a suitable resistor or screwdriver (for safety reasons, the capacitor needs to be short-circuited first).
3. Connect the test leads across the capacitor. The multimeter will automatically detect the capacitance.
4. Read the capacitance value on the display. No distinction between positive and negative electrodes is needed for measurement.

3.8. Temperature Measurement

1. Turn the Function Turntable to the 'Temp' (°C/°F) position.
2. Connect the temperature probe (thermocouple) to the input jacks.
3. Place the probe on or near the object whose temperature you wish to measure.
4. The display will show the temperature in both Celsius and Fahrenheit simultaneously.

3.9. Frequency (Hz) and Duty Cycle (%)

1. Turn the Function Turntable to the 'Hz%' position.
2. Connect the test leads to the signal source.
3. The display will show the frequency (Hz) and duty cycle (%) simultaneously.

3.10. NCV (Non-Contact Voltage) Induction

1. Turn the Function Turntable to the 'NCV' position.
2. Bring the top of the multimeter close to an AC voltage source (e.g., a live wire).
3. The red indicator light will illuminate, and a fast beep tone will sound when a strong AC voltage is sensed. This function can also be used to detect breakpoints in wires.

3.11. Live/Neutral Wire Detection

1. Turn the Function Turntable to the 'Live' position.
2. Insert the red test pen into the socket hole to determine the 'Neutral line' or 'Live line'.
3. If it's the Live line, the screen will display 'LIVE' and a beep will sound. If it's the Neutral line, there will be no response.

4. Maintenance

4.1. Fuse Replacement

The ANENG SZ12 Multimeter is equipped with built-in double fuse tubes (F3A/250V and F20A/250V) to effectively prevent short circuit burning and ensure safer operation. If a fuse is damaged due to current overload:

1. Ensure the multimeter is powered off and test leads are disconnected.
2. Unscrew the screws on the back cover and carefully remove it.
3. Locate the damaged fuse(s) on the circuit board.
4. Gently remove the damaged fuse(s) using tweezers.
5. Replace with new fuses of the corresponding model (F3A/250V or F20A/250V).
6. Reattach the back cover and secure the screws.

4.2. General Care

• Keep the multimeter clean and dry. Use a soft, damp cloth for cleaning; do not use abrasives or solvents.
• Store the multimeter in a cool, dry place away from direct sunlight and extreme temperatures.
• If the multimeter will not be used for an extended period, remove the batteries to prevent leakage.

5. Troubleshooting

• Device freezes or crashes: If the multimeter experiences a 'card' or crash during use, please restart the device by turning the function dial to 'OFF' and then back to the desired measurement mode.
• No display or dim display: Check battery levels. Replace batteries if low. Ensure the backlight is activated in dim conditions.
• Incorrect readings: Verify test lead connections are secure and in the correct input jacks for the selected function. Ensure the correct measurement mode is selected.
• No continuity beep: Check if the continuity function is active. Ensure the circuit or component being tested is de-energized and isolated.

6. Specifications

7. User Tips

• Always ensure the correct function and range are selected before making a measurement to prevent damage to the multimeter or the circuit.
• For current measurements, always connect the multimeter in series with the load and ensure the circuit is de-energized before connecting.
• When measuring capacitance, always discharge the capacitor first.
• Utilize the backlight and flashlight features in low-light conditions for improved visibility and safety.
• The magnetic back and hanging hole are very useful for hands-free operation, especially when working in tight spaces or on vertical surfaces.

8. Warranty and Support

For any questions, technical support, or warranty claims regarding your ANENG SZ12 Digital Multimeter, please contact the manufacturer or your point of purchase. Keep your purchase receipt as proof of purchase.