AC/DC Hipot Tester

1. Unboxing and Basic Familiarization with the Equipment

1.1 Key Technical Specifications

Model/Specifications	Test Voltage Range	Breakdown Current Range	Voltage Transformer Capacity	Test Duration	Accuracy
WB2671A	0–5 kV (AC/DC)	AC: 0–20 mA; DC: 0–20 mA	100VA	1–99 seconds	±5%
WB2671B		AC: 0–100 mA; DC: 0–20 mA	500 VA

1.2 Unboxing and Checking the Contents

1.2.1 Unpacking and Visual Inspection

When unpacking the device, handle it gently to avoid scratching the outer casing with sharp objects. After unboxing, first inspect the exterior of the device to ensure there is no visible deformation or dents, and that the buttons are not damaged or loose. If you notice any abnormalities with the device or its accessories, do not turn it on. Please contact us immediately.

1.2.2 Main Unit and Accessories

Host: 1 WB2671 host.

The main components are as follows:

Number	Note
①	High-voltage rod, including high-voltage rod connecting cable and remote control cable; the handheld end of the high-voltage rod includes control buttons
②	Grounding Clamp
③	Power Cord

Figure 1

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2 Safety Precautions

2.1 Electrical Safety

2.1.1 Power Supply Requirements

Use a single-phase AC 220 V ±10%, 50/60 Hz three-prong outlet; the ground prong must be connected to ground.

2.1.2 Grounding Requirements

The instrument ground wire is reliably connected to the protective ground wire, and the protective ground resistance is ≤4 Ω;

Do not short-circuit the output terminals to the AC power source to prevent the housing from becoming energized.

2.2 Environmental Safety

2.2.1 Temperature and Humidity Requirements

Avoid using the device in environments where humidity exceeds 70% (without condensation) or where temperatures fall outside the range of 0–35°C. The optimal operating temperature is 25±2°C.

2.2.2 Environmental Contraindications

Environments with strong magnetic fields and strong electric fields;

Environments containing corrosive gases or liquids;

Areas with flammable and explosive dust, and areas containing hazardous materials;

Environments with heavy dust, high temperatures and humidity, and direct sunlight.

2.3 Operational Safety

During testing, the housing of the test object is electrified; do not touch it with your bare hands under any circumstances;

The test specimen must be placed on a rubber insulating mat;

Operators must wear rubber insulated gloves;

Never short-circuit the high-voltage output terminal (high-voltage probe) directly to the ground terminal (ground clamp), as this may cause the internal Voltage Transformer to burn out;

Operators must have dry hands and must not wear any metal jewelry; they must not eat or drink during the test to prevent accidents caused by electric shock;

Before replacing the test object, you must first stop the test and verify that the device’s output voltage is 0;

When multiple people are involved, clearly define roles and responsibilities, and confirm them with each other before starting the test to avoid errors.

2.4 Other

For matters not covered in this manual, please proceed with caution or contact us.

3. Equipment Overview

3.1 Front Panel

Number	Note
①	Power Switch
②	The high-voltage output connector in DC test mode is negative; take care when connecting the leads when testing polarized devices.
③	High-voltage output connector in AC test mode, connected to the live parts of the device under test
④	Remote-controlled outlet; remote control cable connected to the high-voltage rod
⑤	Connect the grounding clamp; use the banana plug end to connect to the instrument, and the clamp end to connect to the device under test.
⑥	Test Duration Settings: Test duration can be set from 1 to 99 seconds for use with a timer switch.
⑦	Test time display, in seconds. Note: Available only when the timer switch is enabled.
⑧	Leakage current display window: Displays the alarm threshold in standby mode and the real-time leakage current in test mode, in mA.
⑨	Output voltage display window, showing the current high-voltage output value in kV
⑩	Test Status Indicator: TE: Testing; NG: Leakage current exceeds threshold + buzzer sounds
⑪	Current adjustment knob: Sets the alarm current threshold; used in conjunction with the alarm selection button
⑫	Preset/Test Switch: Press to enter preset mode; push up to enter test mode.
⑬	Timer Switch: Press to enable the timer; release to disable the timer.
⑭	Residual current range selection button: Press to select the 20 mA range; release to select the 2 mA range. The WB2671B includes a 100 mA (AC) range. The ranges are interlocked; only one range can be selected at a time.
⑮	AC/DC Test Mode Switch: Press to select DC test mode; release to select AC test mode.
⑯	Output voltage adjustment knob: Turn clockwise to increase the output voltage; turn counterclockwise to decrease it.
⑰	Press the Start button to begin the test; the test light will turn on.
⑱	Reset button: cuts off the output voltage, stops the test, and clears the alarm

Figure 2

Note: Once the remote control cable is connected, the power and reset buttons on the device’s front panel will not function.

3.2 Back Panel

Number	Note
①	Power cord jack, for connecting the device to a suitable power source
②	Protective grounding terminal: Internally short-circuited to the grounding terminal of the power cord. If the power cord already provides adequate protective grounding, this terminal does not need to be wired.

Figure 3

4. Preparations Before Testing

4.1 Powering On the Equipment

Plug the power cord into a standard three-prong outlet, press the power switch, and the instrument’s display will light up. The TE and NG indicator lights will both be off, the leakage current and voltage displays will read 0, and there will be no abnormal audible or visual alarms, indicating that the device’s power-on self-test was successful. Use the AC/DC test mode selector switch on the main unit as needed.

4.2 Preparation of the Test Specimen

The test object’s casing must be clean and free of oil; place it in the center of the insulating mat, away from the metal work surface.

5. Test Procedure

5.1 Test Parameter Presets

All parameter presets must be completed by following the steps below, with the high-voltage rod, remote control cable, and grounding clamp removed.

5.1.1 Selection of Earth Leakage Current Range

Select the appropriate leakage current range based on the standards for the test item. For example, select the 2 mA range for small electronic components and insulating materials, and the 20 mA range for household appliances, motors, Voltage Transformers, etc.

5.1.2 Setting the Leakage Current Alarm Threshold

Switch the preset/test button to the preset state.

Slowly turn the current adjustment knob while observing the leakage current display window, and adjust the value to the alarm threshold specified in the standard for the test item.

Once the settings have been configured, switch the Preset/Test button to the Test mode; the leakage current display will reset to 0, and the alarm value will be automatically saved.

5.1.3 Setting the Test Duration

Select either manual mode or timer mode according to the test standard requirements:

Manual Mode: Flip the timer switch to the “on” position; there is no need to set a time—the operator manually controls the test duration.

Timer Mode: Press the timer switch to set the test duration to the required length (1–99 seconds); the time remaining is displayed as a countdown.

5.1.4 Output Voltage Setting

Press the Start button, observe the value displayed in the output voltage display window, and adjust it to the standard required value by turning the output voltage adjustment knob. Once adjusted, press the Reset button.

Note: For tests with specified voltage rise rates, do not preset the voltage; simply turn the knob to 0. Once the test has officially begun, slowly turn the knob to adjust the output voltage to the test voltage at the rate specified in the standard.

5.2 Equipment Wiring

5.2.1 Wiring for AC Withstand Voltage Test

Instructions	Note
①	Press the AC/DC switch on the host device to set it to AC mode.
②	Insert the banana plug end of the grounding clamp into the instrument’s connector and ensure that the ground terminal or metal casing of the device under test is securely connected to the clamp’s grounding terminal.
③	Plug the remote control cable from the remote-controlled high-voltage rod securely into the remote control jack on the main unit.
④	Securely connect the high-voltage probe cable to the AC high-voltage output port on the main unit, and temporarily keep the probe’s output end away from the test object.

Figure 4

5.2.2 Wiring for DC Withstand Voltage Test

Instructions	Note
①	Press the AC/DC switch on the host unit to set it to DC mode.
②	Insert the banana plug end of the grounding clamp into the instrument’s connector, and securely connect the other end to the test object using the clamp’s grounding terminal. For polarized test objects, reverse connection is strictly prohibited.
③	Plug the remote control cable for the remote-controlled high-voltage rod securely into the remote control socket on the main unit.
④	Securely connect the high-voltage probe cable to the DC high-voltage output port on the main unit. Keep the probe tip away from the test object for now (during testing, the probe tip must make contact with the negative terminal of the test object to complete the test).

5.3 Withstand Voltage Test

5.3.1 Startup Test

In AC mode, the output end of the high-voltage probe must make close contact with the charged component of the test object (such as the power cord input or the winding input); in DC mode, the output end of the high-voltage probe must make close contact with the specified polarity terminal of the test object (such as the negative terminal of a diode or the negative terminal of a capacitor). Then, press the output control button on the high-voltage probe to begin the test.

Figure 5

5.3.2 End of Testing

In timer mode, when the countdown ends, the high voltage is automatically disconnected and the test stops; in manual mode, the test stops when you release the high-voltage probe control button.

If any of the following abnormalities occur during testing, the test must be stopped immediately: smoke, unusual noises, or sparks from the test item; unusual noises, strange odors, or a black screen on the equipment. After an emergency stop, investigate the cause of the abnormality; do not resume testing until the problem has been resolved.

5.4 Interpretation of Test Results

The test results are evaluated primarily based on whether breakdown has occurred and whether the leakage current exceeds the threshold.

5.4.1 Criteria for Determining Conformity

Throughout the entire test, the voltage remained stable at the required standard value, and the real-time leakage current remained below the set alarm threshold at all times; neither the NG indicator light nor the buzzer alarm was triggered.

5.4.2 Criteria for Determining Nonconformity

During testing, if the leakage current exceeds the alarm threshold, the “NG” indicator lights up and the buzzer sounds.

The test specimen exhibits obvious signs of breakdown, flashover, smoke, etc.

6. Routine Maintenance and Care of Equipment

6.1 Routine Maintenance

Before powering on, inspect the equipment to ensure it is clean and free of damage, that the cables show no signs of aging or breakage, and that the connectors are secure; Check the grounding clamps for oxidation or burnout; if present, wipe them with a specialized contact cleaner. Contact us to replace parts if necessary. After testing is complete, disconnect the power and wipe down the equipment surface and the test area with an antistatic, dry cloth.

6.2 Long-Term Storage

When the device will not be used for an extended period, store it in a dry, well-ventilated environment, away from moisture and direct sunlight; disconnect all cables, store accessories separately, and cover the device with a dust-proof cloth; turn on the device for 30 minutes each month to prevent the internal electronic components from deteriorating.

7. Troubleshooting and Resolution of Common Problems

Fault Symptoms	Possible Causes	Procedure
The device won’t turn on	The power cord is not plugged in securely; the fuse has blown.	Check the power cord connections; check the fuse in the device’s power input port; if it is blown, replace it with a fuse of the same model.
After turning on the device, the display flickers and the buttons do not respond.	Unstable Power Supply Voltage	Use a multimeter to measure the supply voltage and verify that it is within the range of AC 220 V ± 10%. If the voltage is unstable, install a voltage regulator.
Unwarranted alarms during testing	Incorrect selection of the leakage current range; incorrect setting of the alarm current threshold	Please select the correct leakage current range first, then adjust the alarm current threshold.

Appendix A: Summary Table of AC and DC Withstand Voltage Test Requirements in Relevant National Standards

Standard Number	Types of Electronic Products Covered	Types of Withstand Voltage Tests	Core Test Voltage Requirements	Breakdown (Alarm) Leakage Current Requirements	Test Duration Requirements	Notes
GB 4706.1-2024 (IEC 60335-1:2023)	Household and Similar Electrical Appliances (refrigerators, air conditioners, electric irons, microwave ovens, etc., with a rated voltage of ≤250 V AC and ≤48 V DC)	AC is the primary power source, with DC as an alternative (when permitted by standards)	1. Basic insulation: 1000 V + 2 × rated voltage (minimum 1500 V);2. Supplementary insulation: 2500 V/2750 V; 3. Reinforced insulation: 3750 V (2000 V + 4 × rated voltage, minimum 3000 V); 4. Functional insulation: 1.2 × operating voltage	1. Class II devices/structures: ≤0.25 mA; 2. Class 0/Class 0I/Class III devices: ≤0.5 mA; 3. Class I portable devices: ≤0.75 mA; 4. Class I stationary electric devices: ≤3.5 mA; 5. Class I stationary electric heating devices: ≤0.75 mA or 0.75 mA/kW (whichever is greater, up to a maximum of 5 mA)	Standard Test: 1 minute (60 seconds); Production Line Rapid Test: 1–2 seconds (must be equivalent to the 1-minute test; recognized by the standard)	1. Voltage waveform distortion rate ≤ 5%, rise rate ≤ 500 V/s; 2. For appliances equipped with radio interference filters, the leakage current limit may be doubled.
GB 7000.1-2023 (IEC 60598-1:2024)	Lighting fixtures (indoor and outdoor lighting fixtures, LED lights, fluorescent lights, etc.)	Primarily AC	1. Basic insulation: 1000 V + 2× rated operating voltage; 2. Reinforced insulation/double insulation: 2× basic insulation test voltage; 3. Lamp sockets, terminal blocks: 1500 V (AC)	Generally ≤5 mA (classified by luminaire insulation type, similar to household appliances)	Standard Test: 1 minute (60 seconds)	During testing, the luminaires are in their fully assembled state; glass-enclosed luminaires must be wrapped in metal foil to simulate human contact.
GB/T 14472-2017 (IEC 60831-1:2017)	Capacitors for Electronic and Electrical Equipment (Fixed Capacitors, Film Capacitors, etc.)	AC or DC is acceptable; capacitors with high capacitance are preferred for DC.	Classification by capacitor rated voltage: 1. Rated voltage ≤ 250 V: 2 × rated voltage + 1000 V; 2. Rated voltage > 250 V: 2 × rated voltage	There are no specific numerical limits; the criteria for evaluation are the absence of breakdown, flashover, or significant sudden changes in leakage current.		Pay attention to the polarity of the capacitor during DC testing, and ensure it is fully discharged after testing.

Note: All test voltages listed above are root-mean-square (RMS) values of power-frequency AC (50/60 Hz); the DC test voltage is √2 times the peak value of the AC test voltage (e.g., 1500 V AC ≈ 2120 V DC); The WB2671 has a voltage measurement range of 0–5 kV (AC/DC) and a leakage current range of 0–20 mA/100 mA, fully meeting the test requirements of the above standards.