GVDA GD106B Digital Multimeter Instruction Manual

1. Introduction

This manual provides detailed instructions for the safe and effective use of the GVDA GD106B Digital Multimeter. The GD106B is a True RMS, high-performance digital multimeter designed for professional electricians, enthusiasts, and general household use. It features a clear display and intuitive function layout for an enhanced user experience.

For a comprehensive guide, you may also refer to the official user manual PDF: User manual (PDF).

2. Safety Information

Please read this manual carefully before using the instrument and pay special attention to all safety warnings. Failure to follow these instructions may result in damage to the instrument, personal injury, or casualties.

2.1. Safety Statement

In accordance with international copyright law, the contents of this manual may not be copied without permission. The manual is subject to change without prior notice.

A "Caution" mark indicates conditions or operations that may cause damage to the instrument or equipment. Proceed with caution. A "Warning" mark indicates conditions or operations that may cause danger to users, potentially resulting in personal injury or casualties. Do not proceed if conditions are not met or fully understood.

2.2. Safety Instructions

The instrument is designed according to international electrical safety standard IEC61010-1, meeting CAT.III 600V overvoltage safety standards and pollution level 2.

• Always read the manual carefully and observe all safety warnings.
• Strictly follow the operation instructions. Improper use may damage or weaken the instrument's protection functions.
• Exercise caution when measuring voltages exceeding 30V AC true RMS, 42V AC peak, or 60V DC, as there is a risk of electric shock.
• Before use, check the meter's functionality by measuring a known voltage. If it's not working normally or is damaged, do not use it.
• Inspect the instrument for cracks or plastic damage before use. If found, do not use it.
• Check probes for cracks or damage. Replace with the same type and electrical specifications if necessary.
• Use the instrument according to the specified measurement category, voltage, or current rating.
• Comply with local and national safety codes. Wear personal protective equipment (e.g., rubber gloves, masks, flame-retardant clothing) to prevent electric shock or arc flash when working with hazardous live conductors.
• Replace batteries promptly when the low battery indicator appears to avoid measurement errors.
• Do not use the instrument in explosive gas, steam, or wet environments.
• When using probes, keep fingers behind the finger protector.
• When measuring, connect the zero or ground line first, then the live wire. When disconnecting, disconnect the live wire first, then the zero/ground line.
• Before opening the outer cabinet or battery cover, remove the probes from the instrument. Do not use the instrument if the case or battery cover is open.
• Only use the supplied probe or a replacement probe with the same model number and electrical specifications.

2.3. Safety Symbols

Symbol	Description
⚡	High voltage warning
∼	AC (Alternating current)
⏐	DC (Direct current)
≈	AC or DC
⚠	Warning, important safety signs
⏚	Ground
⏻	Fuse
⏹	Double insulation/reinforced insulation
🔋	Low battery voltage
CE	Product complies with all relevant European laws
	Do not discard this electrical/electronic product into household garbage.
CAT. III	Measurement suitable for testing and measuring circuits connected to the distribution part of low voltage power supply devices in buildings.
CAT. IV	Measurement suitable for testing and measuring circuits connected to the power supply of low voltage power installations in buildings.

3. Product Overview

The GVDA GD106B is a versatile digital multimeter with 4000 counts, True RMS capability, and auto-ranging. It is designed for accurate and reliable electrical measurements.

3.1. Key Features

• Input polarity indication: Automatically displays “-”
• Maximum display: 4000 Counts
• MAX. Voltage between terminals and earth ground: 600V
• Sampling Rate: Approximately 3 times per second
• Over range display: The highest position shows "OL"
• Low voltage display: Low battery indication
• Working environment: 0-40°C, relative humidity ＜80%
• Bracket design for convenient use
• Live wire test and NCV measurement capabilities
• Battery test for 1.5V/9V batteries
• Diode and Continuity tests
• Maximum measurement and Data hold functions
• True RMS for accurate AC measurements
• Backlight and Flashlight for use in dark conditions
• Auto-ranging and Auto Power Off for energy saving

3.2. Instrument Panel Description

1. NCV probe
2. Flashlight
3. Red / green light
4. LCD display
5. Function keys (FUNC, HOLD, MAX, Backlight/Flashlight)
6. Function knob
7. COM Input socket
8. Other measurement input socket
9. 10A current Input socket

4. Setup and Initial Use

4.1. Battery Installation

The multimeter requires 2 x 1.5V AAA batteries (not included).

1. Ensure the instrument is switched off and remove the test probes.
2. Use a screwdriver to unscrew the screws fixing the battery cover on the back of the device.
3. Remove any old batteries. Insert new 1.5V AAA batteries, paying close attention to the positive (+) and negative (-) polarity markings inside the battery compartment.
4. Replace the battery cover and secure it with the screws.

Battery compartment for 2x 1.5V AAA batteries.

⚠ WARNING: To prevent electric shock or personal injury, replace batteries promptly when the low battery indicator appears. Do not short-circuit batteries or insert them with reverse polarity.

4.2. Test Probe Connection

Connect the red test probe to the appropriate input socket for the desired measurement (e.g., "+mAµA" for current, "VΩ" for voltage/resistance/diode/capacitance). Connect the black test probe to the "COM" (common) input socket.

5. Measurement Operation

The GVDA GD106B features a function knob to select the measurement type and function keys (FUNC, HOLD, MAX, Backlight/Flashlight) for additional controls.

5.1. Function Knob and Keys

• Function Knob: Rotate to select the desired measurement mode (e.g., DC Voltage, AC Voltage, Resistance, etc.).
• FUNC Key: Used to switch between multiple measurement functions available on a single knob position (e.g., AC/DC current, Diode/Continuity).
• HOLD Key: Press to enter/exit data hold mode, freezing the current reading on the display.
• MAX Key: Press to enter/exit maximum measurement mode, displaying the highest value recorded.
• Backlight/Flashlight Key:
  • Short press: Toggles backlight on/off. Backlight automatically turns off after about 10 seconds.
  • Long press (more than 2 seconds): Toggles flashlight on/off.

5.2. Auto Power Off

The instrument will automatically turn off after 15 minutes of inactivity to save battery energy. Press any key to restore the working state. If the "FUNC" button is pressed while turning on the meter, the auto-shutdown function will be canceled. To re-enable it, turn off the meter and then turn it back on normally.

5.3. DC Voltage Measurement

1. Turn the function knob to the "V⏐" position.
2. Insert the red probe into the "+mAµA" socket and the black probe into the "COM" socket.
3. Contact the probes to the measured circuit in parallel.
4. Read the measurement result on the LCD display.

⚠ WARNING: Do not measure voltages above 600V to prevent instrument damage. Pay special attention to safety when measuring high voltage to avoid electric shock or personal injury. Always test with a known voltage first to confirm proper function.

5.4. AC Voltage Measurement

1. Turn the function knob to the "V∼" position.
2. Insert the red probe into the "+mAµA" socket and the black probe into the "COM" socket.
3. Contact the probes to the measured circuit in parallel.
4. Read the measurement result on the LCD display.

⚠ WARNING: Do not measure voltages above 600V to prevent instrument damage. Pay special attention to safety when measuring high voltage to avoid electric shock or personal injury.

5.5. DC/AC Current Measurement

1. Turn the function knob to the "µA", "mA", or "A" position. Use the "FUNC" key to switch between AC and DC current measurement if needed.
2. For µA/mA measurements, insert the red probe into the "+mAµA" socket. For 10A measurements, insert the red probe into the "10A" socket. Always insert the black probe into the "COM" socket.
3. Disconnect power to the circuit under test. Connect the multimeter in series with the circuit, then reapply power.
4. Read the measurement result.

⚠ WARNING: When measuring large current, continuous measurement should not exceed 15 seconds to prevent damage to the instrument. Always ensure the circuit is de-energized before connecting the multimeter in series.

5.6. Resistance Measurement

1. Turn the function knob to the "Ω" position.
2. Insert the red probe into the "+mAµA" socket and the black probe into the "COM" socket.
3. Contact the probes to the component or circuit to measure resistance.
4. Read the measurement result.

⚠ WARNING: When measuring resistance on a circuit, disconnect the power supply and discharge all high-voltage capacitors. Otherwise, the instrument may be damaged or you may be struck by electric shocks.

5.7. Continuity Test

1. Turn the function knob to the "Ω" position and use the "FUNC" key to switch to continuity mode (indicated by a buzzer symbol).
2. Insert the red probe into the "+mAµA" socket and the black probe into the "COM" socket.
3. Contact the probes to the circuit or component.
4. If resistance is less than 30Ω, the buzzer will sound, and a green indicator light will illuminate. If resistance is between 30Ω and 60Ω, the buzzer will not sound, but a red indicator light will illuminate. The screen will display the measured resistance.

⚠ WARNING: When measuring continuity on a circuit, disconnect the power supply and discharge all high-voltage capacitors. Otherwise, the instrument may be damaged or you may be struck by electric shocks.

5.8. Diode Measurement

1. Turn the function knob to the diode symbol position and use the "FUNC" key to switch to diode measurement mode.
2. Insert the red probe into the "+mAµA" socket and the black probe into the "COM" socket.
3. Touch the diode anode with the red probe and the cathode with the black probe.
4. Read the measurement result, which will display the approximate forward voltage value of the diode.

⚠ WARNING: When measuring diodes on a circuit, disconnect the power supply and discharge all high-voltage capacitors. Otherwise, the instrument may be damaged or you may be struck by electric shocks.

5.9. Capacitance Measurement

1. Turn the function knob to the capacitance symbol position.
2. Insert the red probe into the "+mAµA" socket and the black probe into the "COM" socket.
3. Contact the probes to the component to measure capacitance.
4. Read the measurement result.

⚠ WARNING: When measuring capacitance on a circuit, disconnect the power supply and discharge all high-voltage capacitors. Otherwise, the instrument may be damaged or you may be struck by electric shocks.

5.10. NCV (Non-Contact Voltage) Test

1. Turn the function knob to the "NCV Live" position.
2. Gradually approach the NCV probe (top of the multimeter) to the detected point.
3. If weak AC signals are sensed, a green indicator light will illuminate, and slow beeps will sound.
4. If strong AC signals are sensed, a red indicator light will illuminate, and fast beeps will sound.

NCV measurement in progress.

⚠ WARNING: Follow all safety regulations to avoid electric shock or personal injury during NCV tests.

5.11. Live Wire Detecting

1. Turn the function knob to the "NCV Live" position and use the "FUNC" key to switch to Live test mode (meter will display "LIVE").
2. Insert the red probe into the "+mAµA" socket.
3. Contact the red probe to the test point (e.g., a live wire).
4. If weak AC signals are sensed, a green indicator light will illuminate, and slow beeps will sound.
5. If strong AC signals are sensed, a red indicator light will illuminate, and fast beeps will sound.

Live wire detection in progress.

⚠ WARNING: Follow all safety regulations to avoid electric shock or personal injury during live wire tests.

5.12. Battery Test

1. Turn the function knob to the battery test position (1.5V or 9V).
2. Insert the red probe into the "+mAµA" socket and the black probe into the "COM" socket.
3. Touch the positive terminal of the battery with the red probe and the negative terminal with the black probe.
4. Read the measurement result.

Note: 1.5V range Load resistance: 30Ω | 9V range Load resistance: 300Ω

6. Maintenance

⚠ WARNING: Always keep the inside of the instrument clean and dry to avoid electric shock or instrument damage.

6.1. Cleaning

If there is dust or moisture on the terminals, it may cause measurement errors. Follow these steps to clean the instrument:

1. Switch off the power supply of the instrument and remove the test probes.
2. Turn over the instrument and gently shake out any dust accumulated in the input sockets.
3. Wipe the outer cabinet with a damp cloth and mild detergent. Do not use abrasive cleaners or solvents.
4. Wipe contacts in each input socket with a clean cotton swab soaked in alcohol.

6.2. Replacing Batteries

Replace batteries when the low battery indicator appears to avoid measurement errors.

1. Turn off the instrument and remove the probes.
2. Use a screwdriver to unscrew the battery cover on the back.
3. Remove old batteries and replace them with new ones of the same specifications (2 x 1.5V AAA). Ensure correct polarity.
4. Install the battery cover and secure it with screws.

⚠ WARNING: Do not short-circuit batteries or insert them with reverse polarity. If the instrument will not be used for an extended period, remove the batteries to prevent leakage and potential damage.

6.3. Replacing Fuses

The instrument uses F400mA/250V fuse for µA/mA ranges and F10A/250V fuse for 10A range.

1. Turn off the instrument and remove the probes.
2. Use a screwdriver to unscrew and remove the back cover.
3. Remove the burnt fuse and replace it with a new fuse of the same specifications. Ensure the new fuse is properly clamped in the safety clip.
4. Install the back cover, fix, and lock it with screws.

⚠ WARNING: To avoid electric shock, personal injury, or instrument damage, always use fuses with the exact same specifications.

7. Troubleshooting

If the multimeter is not functioning as expected, consider the following common issues:

• No display or dim display: Check battery level. Replace batteries if low.
• "OL" displayed: This indicates an over-range condition. The measured value exceeds the selected range. Select a higher range or check if the circuit is open.
• Incorrect readings:
  • Check if the correct measurement function is selected.
  • Ensure probes are correctly inserted into the appropriate sockets.
  • Verify that the probes are making good contact with the circuit.
  • For resistance/continuity/diode/capacitance measurements, ensure the circuit is de-energized and capacitors are discharged.
• No continuity beep: Check if the continuity mode is active. Ensure the circuit is de-energized.
• Instrument not turning on: Check battery installation and ensure batteries are not depleted.

If problems persist, consult the full user manual PDF or contact customer support.

8. Specifications

8.1. General Technical Specifications

• Environment Condition: CAT.III 600V, Pollution level 2, Altitude < 2000m.
• Operating Temperature & Humidity: 0~40 ℃ (<80% RH, <10 ℃ non-condensing).
• Storage Temperature & Humidity: -10~60 ℃ (<70% RH, remove the battery).
• Temperature Coefficient: 0.1 × accuracy/℃ (<18 ℃ or >28 ℃).
• MAX. Voltage between terminals and earth ground: 600V.
• Fuse Protection: F400mA/250V (for µA/mA), F10A/250V (for 10A).
• Sampling Rate: About 3 times/second.
• Display: 4000 counts, with automatic unit symbols.
• Over Range Indication: "OL".
• Low Battery Indication: Battery symbol displayed when voltage is low.
• Input Polarity Indication: Automatically displays "-".
• Power Requirement: 2 x 1.5V AAA batteries.
• Dimensions: 151mm x 75mm x 46mm.
• Product Weight: 207g.
• Certifications: CE, FCC.
• Origin: Mainland China.

8.2. Accuracy Specifications

Accuracy applies within one year after calibration, under reference conditions (temperature 18℃ to 28℃, relative humidity ≤ 80%). Accuracy is expressed as ± (% reading + number of digits).

DC Voltage

Input impedance: 10MΩ | Overload protection: 600V

AC Voltage

Input impedance: 10MΩ | Overload protection: 600V | Maximum input voltage: 600V | Frequency Response: 10Hz ~ 1kHz, TRMS

DC Current

Overload protection: µA/mA: F400mA/250V fuse; A: F10A/250V fuse | Maximum input current: µA/mA: 400mA; A: 10A. When measuring large current, continuous measurement should be no longer than 15 seconds.

AC Current

Overload protection: µA/mA: F400mA/250V fuse; A: F10A/250V fuse | Maximum input current: mA: 400mA; A: 10A. When measuring large current, continuous measurement should be no longer than 15 seconds.

Resistance

Overload protection: 250V

Capacitance

Overload protection: 250V

Diode

• Forward DC current: about 1mA
• Reverse DC voltage: about 2.5V
• Displays approximate forward voltage value.
• Overload protection: 250V

Continuity

• Open circuit voltage: about 0.5V
• Buzzer sounds if resistance < 30Ω (green indicator).
• Red indicator if resistance is between 30Ω and 60Ω (no buzz).
• Overload protection: 250V

9. User Tips

• The multimeter is manufactured in China.
• It holds both CE and FCC certifications, ensuring compliance with relevant safety and quality standards.

10. Warranty and Support

For warranty information and customer support, please refer to the seller's policies or contact the GVDA Official Store directly. Keep your purchase records for any warranty claims.

11. Product Demonstration Video

This video demonstrates the calibration and various measurement functions of the GVDA GD106B Digital Multimeter, including voltage, resistance, current, and capacitance tests.