GVDA Smart Clamp Meter User Manual

1. Safety Statement

Please read this manual carefully before using the instrument and pay special attention to safety warning information. Strictly observe the operation of this manual and use this instrument. Otherwise, the protection function of the instrument may be damaged or weakened.

Warnings

• High Voltage Warning: Be careful if the measurement exceeds 30V AC true RMS, 42V AC peak, or 60V DC. There may be danger of electric shock at this kind of voltage.
• Voltage applied between terminals or between each terminal and grounding point shall not exceed the rated value.
• Do not use the instrument around explosive gas, steam, or in a wet environment.
• When using the probe, please put your fingers behind the finger protector of the probe.
• When measuring, connect the neutral wire or the ground wire first, then connect the live wire. When disconnecting, disconnect the live wire first, then disconnect the neutral wire and ground wire.
• Before opening the outer cabinet or battery cover, please remove the probe from the instrument. Do not use the instrument if it is taken apart or the battery cover is opened.
• The instrument only meets safety standards when used with the supplied probe. If the probe is damaged and needs replacement, a probe with the same model number and electrical specifications must be used.
• Do not measure the current when the probe is inserted into the input jack.
• Do not work alone when performing electrical measurements.
• Comply with local and national safety codes. Wear personal protective equipment (such as approved rubber gloves, masks, and flame retardant clothes) to prevent electric shock and electric arc due to exposed hazardous live conductors.
• If the low battery indicator is shown, replace the battery immediately to avoid incorrect readings.

Safety Symbols

Symbol	Description
	High voltage warning
~	AC (Alternating current)
---	DC (Direct current)
~---	AC or DC
!	Warning, important safety signs
⏚	Ground
⎔	Equipment with double insulation/reinforced insulation protection
⎕	Low battery
CE	Product complies with all relevant European laws
INRUSH	Inrush current measurement
	Do not discard this electrical/electronic product into household garbage.

2. Product Overview

The GVDA Smart Clamp Meter is a new generation of true RMS high-performance intelligent digital clamp meters designed to make electrical work easier, more efficient, and safer. It combines a wide range of functions including AC/DC voltage, AC/DC current, inrush current, frequency, duty cycle, resistance, capacitance, temperature, diode, continuity, NCV, and live wire detection.

Key Features:

• HD Color LCD Display with 6000 Counts
• Non-contact AC voltage measurement (NCV)
• AC Inrush current measurement
• MAX/MIN value measurement
• Live wire detection
• Auto power off
• Low voltage display (low battery indication)
• Over range indication ("OL")
• DCA zero (only GD166B GD168B)
• Flashlight for dark conditions
• Test lead storage design

Product Components (GD166A / GD166B)

Product Components (GD168B)

Package Contents:

• 1pc Multimeter
• 1pair Pen cables (Test Leads)
• 1pc Cloth bag
• 1pc Thermocouple probe
• 1pc Box
• 1pc Manual

3. Setup

Battery Installation or Replacement

The meter uses three AAA 1.5V batteries (not included). Please install or replace the batteries according to the following steps:

1. Turn off the power of the instrument and remove the test probes.
2. Use a screwdriver to unscrew the screw that fixes the battery cover and remove the cover.
3. Remove the old batteries (if any) and install new AAA 1.5V batteries according to the polarity marked in the battery box.
4. After installing the new batteries, cover the battery cover and lock the screw.

Test Lead Placement Design

The clamp meter features a convenient design for storing test leads. There is a pen rack in the clamp where you can place one of the probes when only using a single probe for measurement.

4. Operating Instructions

Power On/Off

1. Press and hold the Power button () for about 2 seconds to turn on the meter.
2. The meter automatically performs a self-test and displays "CAL". Do not press the trigger to open the clamp during this time.
3. Wait until the buzzer beeps "beep, beep, beep" to indicate the completion of the self-test. The meter is then ready for measurement.
4. To turn off, press and hold the Power button for about 2 seconds.

Smart (AUTO) Measurement Mode

The meter enters Smart Mode by default. In this intelligent measurement mode, you don't need to manually select the measurement function. The meter automatically identifies and measures AC/DC voltage, AC/DC current, resistance, and continuity. Current is measured with the clamp, and other measurements are taken from the test lead input.

Professional Measurement Mode

To access specific measurement functions, press the FUNC/AUTO button to cycle through modes or the SEL/INRUSH button for specific selections.

AC/DC Current Measurement

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "A".
3. Press the SEL/INRUSH button to select AC or DC current measurement.
4. Open the clamp using the trigger, clamp the conductor (only one live or neutral wire, not two combined), and slowly release the trigger until the clamp is completely closed. Ensure the conductor is in the center of the pliers to avoid errors.
5. Read the measurement results from the display screen. The frequency is also shown when measuring AC current.

AC Inrush Current Measurement

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "A".
3. Press the SEL/INRUSH button to select inrush current measurement, indicated by "INRusH" on the display.
4. Open the clamp, clamp the conductor, and slowly release the trigger.
5. Turn on the device to be tested (e.g., a motor) to trigger the surge current.
6. Read the measurement results from the display screen.

AC/DC Voltage Measurement

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "V".
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Contact the probes to the measured circuit (connect in parallel to the power supply or circuit).
5. Read the measurement result. If AC voltage is measured, the frequency will also be displayed.

Resistance Measurement

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "Ω".
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Contact the probes to the measured circuit or resistance.
5. Read the measurement result.

Continuity Test

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to the continuity symbol ().
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Contact the probes to the circuit or component. If the resistance is less than 50Ω, the buzzer sounds and the green alarm indicator light turns on.

Diode Test

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to the diode symbol ().
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Touch the diode anode with the red probe and the cathode with the black probe.
5. Read the measurement result. If the probe polarity is opposite to the diode polarity, the meter shows "OL", which can be used to distinguish the anode and cathode.

Capacitance Measurement

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to the capacitance symbol ("F").
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Contact the probes to the measured capacitor.
5. Read the measurement results from the display screen after the display is stable. Note: The stability time for large capacitance is relatively long.

Frequency/Duty Measurement

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "Hz/%".
3. Insert the red probe into the "INPUT" jack and the black probe into the "COM" jack.
4. Connect the meter in parallel to the power supply or load to be tested.
5. Read the measurement result.

Temperature Measurement

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "°C/°F".
3. Insert the K-type thermocouple into the instrument: the positive pole (red) into the "INPUT" jack, and the negative pole (black) into the "COM" input.
4. Contact the thermocouple probe with the measured object and read the results from the display screen.

Non-contact AC Voltage Detection (NCV)

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "NCV/Live".
3. Gradually approach the NCV probe to the detected point.
4. When a weak electric field signal is induced, the "--L" symbol will be displayed, the beep will emit a slow beep, and the green LED indicator will light up.
5. When a strong electric field signal is induced, the "--H" symbol will be displayed, the beep will emit a fast beep, and the red LED indicator will light up.

Single Probe Live Wire Detection (LIVE)

1. Turn on the meter.
2. Press the FUNC/AUTO button to set the pointer to "NCV/Live".
3. Press the SEL/INRUSH button to select "Live" measurement.
4. Insert the red probe into the "INPUT" jack and remove the black probe.
5. Contact the red probe with the conductor under test.
6. When a low voltage is detected, the character "---L" is displayed, the beeper emits a slow beeping tone, and the green LED lights up.
7. When a high voltage is detected, the "--H" character is displayed, the buzzer emits a fast beeping sound, and the red LED indicator lights up. Under normal circumstances, the detected line is the "LIVE" line.

Flashlight Operation

Press the Flashlight button () and hold for more than 2 seconds to turn the flashlight on or off. This is convenient for use in dark conditions.

Data Hold

Press the Data Hold button () to enable or disable the data hold function, which freezes the current reading on the display.

Maximum/Minimum Value Measurement

1. Press the MAX/MIN button to switch on the maximum and minimum value measurement.
2. Press the MAX/MIN button again to cycle through the maximum and minimum values.
3. Press and hold the MAX/MIN button for more than 2 seconds to exit this measurement mode.

Note: This function is invalid in inrush current, continuity, diode, frequency/duty cycle, temperature, NCV/Live functions.

Automatic Shut-down (Auto Power Off)

If there is no operation within 15 minutes after starting up, the meter will automatically shut down to save battery energy.

Cancel Auto Power Off

1. Press and hold the FUNC/AUTO key, then press the Power button to turn on the instrument. Release the FUNC/AUTO key. The display will not show the auto power off symbol, and the automatic switch-off function will be cancelled.
2. Restart the machine to restore the automatic shutdown function.

Video Demonstration

5. Maintenance

General Maintenance

• Maintenance and service of this instrument must be carried out by professional qualified maintenance personnel or a dedicated maintenance department.
• Use a wet cloth or mild detergent regularly to clean the shell. Do not use abrasives or solvents. Wipe the contacts in the socket with a clean cotton swab soaked in alcohol.

Battery Care

• Always use the same type of batteries (AAA 1.5V). Do not use substandard batteries.
• To ensure safe operation and prevent damage from battery leakage, remove the batteries when the instrument is not in use for a long time.

6. Troubleshooting

• Incorrect Readings: If the meter displays the low battery indicator, replace the batteries immediately to ensure accurate measurements.
• No Power: Ensure batteries are correctly installed and charged. If the meter does not turn on, check for physical damage to the instrument or probes.
• Inaccurate NCV/Live Detection: Remove the test leads (stylus) when using the NCV function, as leaving them inserted can affect detection accuracy.
• "OL" Display: This indicates an over-range condition. The measured value exceeds the meter's maximum range for the selected function.

7. Specifications

General Technical Specifications

• Environment Condition: CAT.III 600V, Pollution level: 2
• Altitude: < 2000m
• Operating Temperature: 0℃~40℃ (<80% RH, <10℃ non-condensing)
• Storage Temperature: -10℃~60℃ (<70% RH, remove the battery)
• Temperature Coefficient: 0.1x accuracy/℃ (<18℃ or >28℃)
• Max. Voltage between terminals and earth ground: 600V
• Display: 6000 counts, automatically displays unit symbols.
• Input Polarity Indication: Automatically displays "-".
• Power: 3 x 1.5V AAA batteries
• Dimensions: 199*81*32mm
• Weight: 0.45KG
• Certifications: CE, FCC

Function Comparison Table

Accuracy Specifications

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

DC Voltage

Input impedance: 10MΩ. Maximum input voltage: 600V.

AC Voltage

Input impedance: 10MΩ. Maximum input voltage: 600V. Frequency Response: 40Hz ~ 1kHz (TRMS).

DC Current

Maximum input current: 600A. (Note: GD166A is an AC Clamp Meter and does not have DC current function).

AC Current

Maximum input current: 600A. Frequency Response: 40Hz ~ 400Hz (TRMS).

Resistance

Capacitance

Overload protection: 250V. The above accuracy does not include the error caused by the pen capacitance.

Frequency

Overload protection: 250V.

Duty Cycle

Temperature

Note: The above accuracy does not include the error of the thermocouple probe.

8. User Tips

• Leverage Smart Mode: For general measurements of voltage, current, resistance, and continuity, rely on the Smart (AUTO) measurement mode for quick and automatic detection.
• Accurate Current Measurement: When using the clamp for AC current, always ensure you clamp only one conductor (either the live or neutral wire), never two lines combined, to get an accurate reading.
• NCV Safety: Utilize the Non-Contact AC Voltage (NCV) detection feature to quickly and safely check for the presence of AC voltage without direct contact. Remember to remove test leads for optimal NCV accuracy.
• Live Wire Identification: Use the dedicated Live wire detection function with a single probe to identify live conductors, indicated by "--H" and a fast beep for high voltage.
• Dark Environments: Don't forget to use the built-in flashlight for better visibility when working in dimly lit areas.

9. Warranty and Support

For detailed warranty information, please refer to the terms and conditions provided by your seller or retailer at the time of purchase. This manual provides operational guidelines and specifications.

A digital version of this user manual is available for download:

• User Manual (PDF)

For further assistance or technical support, please contact the GVDA Tools Store directly or your point of purchase.