GVDA GD136A Smart Digital Multimeter User Manual

1. Introduction

Thank you for choosing the GVDA GD136A Smart Digital Multimeter. This device is an intelligent, true RMS digital multimeter designed for accurate and reliable electrical measurements. This manual provides essential information for safe operation, setup, maintenance, and specifications of your multimeter. Please read this manual thoroughly before use and keep it for future reference.

Key Features:

• 4000 Counts Display
• Smart (AUTO) Measurement Mode
• AC/DC Voltage Measurement
• Resistance Measurement
• Continuity Test
• Frequency Measurement
• Non-contact AC Voltage Detection (NCV)
• Live Wire Detecting
• True RMS
• Auto Range
• HD Backlight

2. Safety Information

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

• 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.
• Do not measure voltage higher than the rated value between terminals or between terminals and ground.
• Take special care when measuring values that exceed 60VDC, 30VAC RMS, or 42V. This kind of voltage has the danger of electric shock.
• 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, check for cracks or damaged plastic parts in the instrument shell. If so, do not use it.
• Before using the meter, check whether the probe is cracked or damaged. If so, replace the probe with the same model and electrical specification.
• Use the meter according to the measurement category, voltage, or current rating specified.
• Observe local and national safety regulations. Wear personal protective equipment (such as approved rubber gloves, masks, and flame retardant clothing) to prevent injury caused by electric shock and electric arc when dangerous live conductors are exposed.
• When the 'battery' symbol is displayed, replace the battery promptly to prevent measurement error.
• Do not use the meter in environments with explosive gas, steam, or high humidity.
• When using the probe, hold your fingers behind the probe finger guard.
• When measuring, connect the null or ground wire first, then the live wire. When disconnecting, disconnect the live wire first, 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 it is disassembled or the battery cover is open.
• The meter can only be used with the provided probe to meet safety requirements. If the probe is damaged and needs replacement, use a probe of the same model and electrical specification.

3. Product Overview

The GVDA GD136A is a compact and versatile smart digital multimeter. Below is an overview of its components and dimensions.

Figure 1: GVDA GD136A Multimeter with dimensions, test leads, user manual, and gift box. Dimensions: Length approx. 12.6cm (4.96in), Width approx. 6.5cm (2.56in), Thickness approx. 1.9cm (0.75in).

Components:

• Display: Digital display for measurement readings, icons, and indicators.
• Power Button (red): Press and hold for ~2 seconds to turn on/off.
• Backlight/Flashlight Button (light bulb icon): Short press for backlight, long press for flashlight.
• Hold Button (H): Short press to hold current reading.
• Function Button (FUNC): Press to cycle through manual measurement modes. Long press to return to Smart (AUTO) mode.
• Input Jacks:
  • COM Jack (black): Common terminal for all measurements.
  • INPUT Jack (red): Input terminal for voltage, resistance, continuity, frequency, NCV, and live wire detection.
• NCV Sensor Area: Top part of the meter used for non-contact AC voltage detection.

Figure 2: Multimeter display highlighting key features: 4000 Counts, Smart measurement, AC/DC voltage, Resistance, Continuity, Frequency, NCV, Live wire detecting.

4. Setup

4.1. Battery Installation

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

1. Ensure the meter is powered off and remove the test leads.
2. Locate the battery cover on the back of the meter.
3. Unscrew the screw fixing the battery cover and remove the cover.
4. Insert two 1.5V AAA batteries, observing the correct polarity (+/-).
5. Replace the battery cover and secure it with the screw.

WARNING: Replace the battery immediately when the low battery indicator appears on the display to avoid inaccurate readings. Do not discharge the battery by shorting it or reversing its polarity.

4.2. Power On/Off

• To Power On: Press and hold the red power button for about 2 seconds. The meter will default to Smart (AUTO) measurement mode.
• To Power Off: Press and hold the red power button for about 2 seconds.

5. Operating Instructions

5.1. General Functions

• Gear Selection: Press the FUNC key to enter manual mode. Press FUNC repeatedly to select the desired measurement function. Press and hold FUNC for about 2 seconds to return to Smart (AUTO) measurement mode.
• Data Hold: Press the H key to turn on or off data holding. (Not valid in NCV/Live mode).
• Flashlight: Press and hold the light bulb icon key for about 2 seconds to turn on or off the flashlight.
• Backlight: Press the light bulb icon key to turn on or off the backlight. (Note: VA display without this function).
• Auto Power Off (APO): After power on, APO is on by default (symbol displayed). Without any key operation for about 15 minutes, the meter will automatically shut down to save battery energy. To cancel APO, press and hold FUNC key to turn on the meter. The symbol will not be displayed.

5.2. Measurement Operations

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 it is in good condition.

5.2.1. Smart (AUTO) Measurement

This is the default mode when powered on. The meter automatically identifies and measures DC voltage, AC voltage, resistance, and continuity.

1. Power on the meter. It will display 'Auto'.
2. Insert the red probe into 'INPUT' jack and the black probe into 'COM' jack.
3. Contact the probes with both ends of the measured power supply or resistance. The meter will automatically recognize the signal.
4. Read the results from the display.

Note: The minimum measurable voltage in this mode is 0.8V.

5.2.2. AC/DC Voltage Measurement

1. Power on the meter.
2. Press FUNC to select 'V' (voltage) gear.
3. Insert the red probe into 'INPUT' jack and the black probe into 'COM' jack.
4. Contact the probes with both ends of the power supply (parallel).
5. Read the results from the display.

5.2.3. Resistance Measurement

1. Power on the meter.
2. Press FUNC to select 'Ω' (resistance) gear.
3. Insert the red probe into 'INPUT' jack and the black probe into 'COM' jack.
4. Contact the probes with both ends of the measured resistance (parallel).
5. Read the results from the display.

5.2.4. Continuity Test

1. Power on the meter.
2. Press FUNC to select 'continuity' gear (speaker icon).
3. Insert the red probe into 'INPUT' jack and the black probe into 'COM' jack.
4. Contact the probes with both ends of the measured resistance or circuit.
5. If the resistance value is less than approximately 50Ω, the buzzer will sound and the alarm indicator will be on.
6. Read the results from the display.

5.2.5. Frequency Measurement

1. Power on the meter.
2. Press FUNC to select 'Hz' (frequency) gear.
3. Insert the red probe into 'INPUT' jack and the black probe into 'COM' jack.
4. Contact the probes with both ends of the measured power supply.
5. Read the results from the display.

5.2.6. Non-contact AC Voltage Detection (NCV)

1. Power on the meter.
2. Press FUNC to select 'NCV' gear.
3. Gradually move the NCV sensor area (top of the meter) close to the conductor.
4. When a weak electric field signal is detected, it will display '-L', the buzzer will sound slowly, and the green light will turn on.
5. When a strong electric field signal is detected, it will display '-H', the buzzer will sound quickly, and the red light will turn on.

5.2.7. Live Wire Detecting

1. Power on the meter.
2. Press FUNC to select 'Live' gear.
3. Insert the red probe into 'INPUT' jack and remove the black probe.
4. Use the red probe to contact the conductor.
5. When a weak electric field signal is detected, it will display '-L', the buzzer will sound slowly, and the green light will turn on.
6. When a strong electric field signal is detected, it will display '-H', the buzzer will sound quickly, and the red light will turn on.

Figure 3: GVDA GD136A performing live wire detection on an electrical panel.

6. Maintenance

6.1. Cleaning

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.

6.2. Battery Replacement

Refer to Section 4.1. Battery Installation for detailed instructions.

7. Troubleshooting

If the multimeter does not function as expected, please check the following:

• No display or dim display: Check battery level and replace if necessary. Ensure batteries are inserted with correct polarity.
• Inaccurate readings: Check battery level. Ensure test leads are properly connected and not damaged. Verify the correct measurement function is selected.
• No continuity beep: Ensure the circuit is de-energized. Check if the resistance is below the threshold (approx. 50Ω).
• Meter does not turn on: Ensure batteries are fresh and correctly installed.

If problems persist, contact customer support for assistance.

8. Specifications

8.1. General Technical Specifications

• Environment Condition: CAT III 600V, Pollution level 2, Altitude <2000m
• Working Temperature and Humidity: 0-40°C (<80% RH, <10°C non-condensing)
• Storage Temperature and Humidity: -10-60°C (<70% RH, remove battery)
• Temperature Coefficient: 0.1 x accuracy/°C (<18°C or >28°C)
• MAX. Voltage between terminals and earth ground: 600V
• Sampling Rate: approx. 3 times/second
• Display: 4000 counts
• Over Range Indication: 'OL'
• Low Battery Indication: 'battery' symbol
• Input Polarity Indication: '-' display
• Power Requirement: 2 x 1.5V AAA batteries
• Product Weight: 104g
• Product Size: 126*19*65mm

8.2. Accuracy Specifications

Accuracy applies within one year after calibration. Reference condition: environment temperature 18°C to 28°C, relative humidity no more than 80%. Accuracy: ±(% reading + digits).

Input Impedance: Approx. 10MΩ. Overload protection: 600V.

Input Impedance: Approx. 10MΩ. Frequency Response: 40Hz-1kHz (True RMS). Overload protection: 600V.

Overload protection: 250V.

Overload protection: 250V.

8.3. Continuity

Buzzer will sound and the indicator light will be on if resistance is < approx. 50Ω. Overload protection: 250V.

9. Warranty and Support

GVDA products are manufactured under strict quality standards. For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or contact your local dealer/distributor. Please retain your proof of purchase for warranty claims.