GVDA Pen Type Digital Multimeter User Manual

1. Introduction

This instrument is a true RMS digital multi-meter with intelligent test function. It is designed for a wide range of electrical measurements, including AC/DC voltage, resistance, capacitance, frequency, continuity, diode testing, live wire detection, and phase sequence detection. Its compact pen-type design makes it suitable for mobile phone repair, home repair, smart home repair, personal DIY repair, and other precision motherboard repairs.

2. Safety Instructions

Please read this manual carefully and pay special attention to safety warning information before using the meter. Operate the meter according to the manual, otherwise the protection function provided by the instrument may be damaged or weakened.

▲ Caution:

Operation that may cause damage to the meter.

▲ Warning:

Operation that may cause danger to users.

The meter conforms to IEC61010-1 CAT.III600V overvoltage safety standard and pollution level 2.

To avoid possible electric shock or personal injury, please observe the following specifications:

• Please read this manual carefully and pay special attention to safety warning information before using the meter.
• Operate the meter according to the manual, otherwise the protection function provided by the instrument may be damaged or weakened.
• Take special care when measuring values that exceed 60VDC, 30VAC RMS, or 42V. This kind of voltage has the danger of electric shock.
• Do not measure voltage higher than the rated value between terminals or between terminals and ground.
• Measure the known voltage to check whether the meter works normally. If it is not normal or damaged, please do not use it again.
• Before using the meter, please check whether there are cracks or damaged plastic parts in the instrument shell. If so, please do not use it again.
• Before using the meter, please check whether the probe is cracked or damaged. If so, please replace the probe with the same model and the same electrical specification.
• Please use the meter according to the measurement category, voltage or current rating specified in the meter or manual.
• Please observe local and national safety regulations. Wear personal protective equipment (such as approved rubber gloves, masks and flame retardant clothing, etc.) to prevent injury caused by electric shock and electric arc when dangerous live conductors are exposed.
• When the "a" symbol is displayed on the meter, please replace the battery in time to prevent measurement error.
• Do not use the meter in the environment with explosive gas or steam or humid environment.
• When using the probe, please hold your fingers behind the probe finger guard.
• When measuring, please connect the null or ground wire first, then the live wire; when disconnected, please disconnect the live wire first, and then the null or ground wire.
• Remove the probe from the meter before opening the case or battery cover. Do not use the meter when the meter is disassembled or the battery cover is opened.
• The meter can only be used together with the probe provided to meet the requirements of the safety standard. If the probe is damaged and needs to be replaced, the probe of the same model and electrical specification must be replaced.

3. Product Overview

Components and Controls

The GVDA GD107 Pen Type Digital Multimeter features a compact design with an HD display and intuitive controls.

• Input Terminal: For connecting the red test probe.
• Signal Intensity Indicator: Visual indication of signal strength.
• Display LCD: High-definition screen for displaying measurement results.
• Function Key (FUNC): Used for selecting different measurement gears.
• Input COM Terminal: For connecting the black test probe.
• Power On/Off Button: To turn the device on or off.
• Data Hold/Flashlight Button: To hold displayed data or activate the flashlight.
• Range Switching: (Integrated with FUNC key for auto-ranging)
• Indicator Light: Provides visual feedback during certain tests (e.g., live wire detection).
• Flashlight: Integrated light for illuminating work areas.

4. Setup

Battery Installation

The GVDA GD107 requires 2 x 1.5V AAA batteries (not included) for operation.

1. Turn off the meter power and remove the probes.
2. Remove the screw fixing the battery cover and remove the battery cover.
3. Remove the old battery (if any) and replace it with a new one of the same specification. Please pay attention to the battery polarity.
4. Install the battery cover back to its original position, and fix and lock the battery cover with screws.

▲ Warning:

• To avoid electric shock or personal injury caused by wrong reading, please replace the battery immediately when the battery is low. Do not discharge the battery by shorting it or reversing its polarity.
• To operate and maintain the meter safely, please take out the battery when it is not used for a long time to prevent battery leakage from damaging the product.

5. Operating Instructions

General Operation

• Power On/Off: Press and hold the power button (⏻) for about 2 seconds to turn the meter on or off.
• Gear Selection: Press the Function button (FUNC) to cycle through different measurement modes. Press and hold the FUNC key for about 2 seconds to return to the intelligent (AUTO) measurement mode. The meter defaults to intelligent measurement mode upon power-on.
• Data Hold: Press the data hold button (H) to freeze the current reading on the display. Press again to release.
• Flashlight: Press and hold the flashlight button (💡) for about 2 seconds to turn the flashlight on or off.
• Auto Power Off: The meter will automatically shut down after about 15 minutes of inactivity to save battery life. The "a" symbol indicates this feature is active.

▲ Warning:

• Do not measure voltage higher than 600V, otherwise the meter may be damaged.
• Pay special attention to safety when measuring high voltage to avoid electric shock or personal injury.
• Before use, test the known voltage with the meter to confirm that the meter is in good condition.

Measurement Modes

5.1. Smart (AUTO) Measurement

This is the default mode upon power-on. The meter automatically identifies and measures DC voltage, AC voltage, resistance, and continuity.

1. Press the power button to turn on the meter. "Auto" will display, indicating intelligent measurement mode.
2. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
3. Contact the probes with both ends of the measured subject. The meter will automatically recognize the signal.
4. Read the results from the display.

Note: The minimum measurable voltage in this mode is about 0.8V. When measuring resistance, if the value is < 50 Ω, the buzzer will sound.

5.2. Frequency Measurement

1. Press the power button to turn on the meter.
2. Press the "FUNC" key to select the "Hz" gear.
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Contact the probes with both ends of the measured subject.
5. Read the results from the display.

5.3. Capacitance Measurement

1. Press the power button to turn on the meter.
2. Press the "FUNC" key to select the "Cap" gear.
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Contact the probes with both ends of the measured capacitor.
5. Read the results from the display.

5.4. Diode Measurement

1. Press the power button to turn on the meter.
2. Press the "FUNC" key to select the "Diode" gear.
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Connect the red probe to the anode of the diode and the black probe to the cathode of the diode.
5. Read the forward bias value on the display screen.

Note: If the test wire is inversely connected, the display will show "OL", which can be used to distinguish the anode and cathode of the diode.

5.5. Live Wire Detecting

1. Press the power button to turn on the meter.
2. Press the "FUNC" key to select the "LIVE" gear.
3. Insert the red probe into the "INPUT" jack and remove the black probe.
4. Use the red probe to contact the conductor.

• When a weak electric field signal is detected, it will display "---L"; the buzzer will sound slowly and the green light will turn on.
• When a strong electric field signal is detected, it will display "---H"; the buzzer will sound quickly and the red light will turn on.

5.6. Phase Sequence Detection

1. Press the power button to turn on the meter.
2. Press the "FUNC" key to select the "Phase" gear to enter the phase sequence detection state.
3. First Phase: Display the "PA" symbol with the "A" letter flashing and plug the sensing probe into the first phase line socket, waiting for a beep.
4. Second Phase: Display the "PAB" symbol with the "B" letter flashing and plug the sensing probe into the second phase line socket and wait for a beep.
5. Third Phase: Display the "PABC" symbol with the "C" letter flashing and plug the sensing probe into the third phase line socket and wait for a long beep.
6. At the end of the test, the display will show the measurement results:

• "P --- L" symbol indicates left-handed phase sequence.
• "P --- R" symbol indicates right-handed phase sequence.

Note: Please complete the test on the three wires within 1 minute, otherwise a detection timeout error will occur. The prompt is that the PABC symbol appears and the P letter flashes. In case of timeout error, please return to phase sequence detection function for retest.

Product Demonstration Video

A video demonstrating the various functions and usage of the GVDA Pen Type Digital Multimeter.

6. Specifications

7. Maintenance

Cleaning

To ensure the longevity and proper functioning of your multimeter, regular cleaning is recommended:

1. Turn off the meter power and remove the probes.
2. Wipe the case with a damp cloth or mild detergent. Do not use abrasives or solvents.
3. Wipe the contacts in each input socket with a clean swab soaked in alcohol.

▲ Warning:

Always keep the inside of the meter clean and dry to prevent electric shock or damage to the meter.

Battery Replacement

Refer to the Battery Installation section for detailed instructions on replacing the batteries.

8. Troubleshooting

• Slow Response in Auto Mode: If the meter appears slow to respond in auto-ranging modes, ensure the probes have good contact with the circuit. For very precise or rapidly changing measurements, manual range selection (if available for the specific function) might offer quicker results.
• Inaccurate Phase Sequence Detection: Ensure all three phase lines are contacted within the 1-minute timeout period. Verify proper connection of the sensing probe to each phase. Environmental factors or interference can sometimes affect non-contact measurements.
• No Display/Power: Check battery installation and ensure batteries are not depleted. Replace with fresh AAA batteries if necessary.
• "OL" Indication: This indicates an over-range condition (measurement exceeds the meter's maximum capacity for the selected range) or an open circuit (e.g., a broken wire during continuity test).

9. User Tips

• For critical measurements, especially when using auto-ranging features, allow a moment for the device to stabilize and provide the most accurate reading.
• While the auto-mode is convenient, understanding manual range selection (if applicable for specific functions) can sometimes provide faster or more controlled measurements.
• Always double-check your connections and ensure the correct measurement mode is selected before taking readings to prevent potential damage to the device or inaccurate results.

10. Warranty and Support

The GVDA GD107 Pen Type Digital Multimeter comes with a 24-month Manufacturer's Limited Warranty for defective items, excluding items damaged and/or misused after receipt. Accessories are covered by a 3-month warranty.

For more detailed information regarding the product, including comprehensive technical diagrams and additional operational details, please refer to the official User Manual (PDF).