AC Withstand Voltage Tester

1. Basic Understanding of Equipment

1.1 Key Technical Specifications

Model/Specifications	Test Voltage Range	Breakdown Current Range	Voltage Transformer Capacity	Test Duration	Accuracy
WB2672A	0–10 kV (AC)	AC: 0–20 mA	200 VA	1–999 seconds	±5%

1.2 Equipment Configuration Verification

1.2.1 Unpacking

When unpacking the device, handle it gently to avoid scratching the outer casing with sharp tools. After unpacking, first inspect the exterior of the device to ensure there are no obvious deformations 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 WB2672A host.

The main components are as follows:

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

1.2.3 Downloading Electronic Documents

We have already sent the download links for the digital user manual, warranty card, and other documents via email at the time of shipment. Please download them as soon as possible. If you missed the email, you can contact us to request the download links again.

2. Safety Precautions

2.1 Electrical Safety

2.1.1 Power Requirements

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

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 terminal 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 the temperature is 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 live; 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 (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; eating or drinking is prohibited during testing 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.

Equipment Overview

3.1 Introduction to the Equipment Front Panel

Number	Note
①	Power Switch
②	High-voltage output connector, for connecting to the live parts of the device under test
③	Remote-controlled outlet; remote control cable connected to the high-voltage rod
④	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.
⑤	Test time display window; can be set from 1 to 999 seconds
⑥	Leakage current display window: Displays the alarm threshold in standby mode and the real-time leakage current in test mode, in mA.
⑦	Output voltage display window, showing the current high-voltage output value in kV
⑧	Test Status Indicator: TE: Testing; NG: Leakage current exceeds threshold + buzzer sounds
⑨	Settings button
⑩	Arrow keys: Use to adjust the number of digits displayed when setting parameters
⑪	Decimal point
⑫	Value adjustment keys: Use these to adjust the numerical values when setting parameters.
⑬	Confirm button
⑭	Output voltage adjustment knob: Turn clockwise to increase the output voltage; turn counterclockwise to decrease it.
⑮	Press the Start button to begin the test; the test light will turn on.
⑯	Reset button: cuts off the output voltage, stops the test, and clears the alarm

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

3.2 Introduction to the Equipment 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.

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, and the leakage current and voltage displays will show 0. If there are no abnormal audible or visual alarms, this indicates 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 clamps unplugged.

Instructions	Note
①	Press the Set button; the numbers in the test time display window will flash. Set the test duration using the arrow keys and the value adjustment keys. If you need to manually control the test duration, set it to 0. Once set, press the Set button again to proceed to the next parameter. If you do not need to set any other parameters, press the Confirm button to exit.
②	Continue to set the next parameter. The number in the leakage current window will flash. Set the upper limit for the leakage current using the arrow keys, the decimal point key, and the value adjustment keys. Once set, press the “Set” key to proceed to the next parameter. If no other parameters need to be set, press the “Confirm” key to exit.
③	Continue to the next parameter to set the lower limit for leakage current. The factory default is 0, and this setting generally does not need to be adjusted. Press the “Set” button to proceed to the next parameter. If you do not need to set any other parameters, press the “Confirm” button to exit.
④	Continue to set the next parameter. The leakage current range automatically switches based on the upper limit value set for leakage current, with two ranges available: 2 mA and 20 mA. Press the “Set” button to proceed to the next parameter. If no other parameters need to be set, press the “Confirm” button to exit.
⑤	Continue to set the next parameter: buzzer alarm. “ON” enables it and “OFF” disables it; use the adjustment keys to toggle between settings. Once set, press the “Set” key to proceed to the next parameter. If you do not need to set any other parameters, press the “Confirm” key to exit.
⑥	Continue to configure the next parameter. The communication address and baud rate are communication-related parameters; since this device does not have communication capabilities, these do not need to be set. Screen brightness ranges from 1 (dimmest) to 5 (brightest). After configuring these settings, press the “Set” button to proceed to the next parameter. If no other parameters need to be set, press the “Confirm” button to exit.
⑦	Output Voltage Setting: Press the Start button and observe the value displayed in the output voltage display window. Use the output voltage adjustment knob to set it to the required standard value. 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	Insert the banana plug end of the grounding clamp into the instrument’s connector, and verify that the ground terminal or metal casing of the device under test is securely connected to the clamp’s grounding terminal.
②	Plug the remote control cable for the remote-controlled high-voltage rod securely into the remote control jack on the main unit.
③	Securely connect the high-voltage probe cable to the AC high-voltage output port on the main unit; keep the high-voltage probe’s output end away from the test object for the time being.

5.3 Withstand Voltage Test

5.3.1 Startup Test

The output end of the high-voltage probe should make close contact with the charged parts of the test object (such as the power cord input or the winding leads). Then press the output control button on the high-voltage probe to perform the test.

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 Acceptance

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, or other similar phenomena.

6. Daily 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 burn marks; if present, wipe them with a specialized contact cleaner, and 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 is not in use for an extended period, store it in a dry, well-ventilated area, 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 Resolving 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 computer, the screen flickers and the keys 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	Improperly Set Alarm Current Threshold	Set the correct alarm current threshold

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

Standard Number	Types of Electronic Products Covered	Dielectric Withstand Voltage Test Requirements	Breakdown Current / Leakage Current Limits	Test Duration	Other Testing Requirements
GB 7000.1-2023/IEC 60598-1:2024	All types of lighting fixtures (including semi-fixtures) with a supply voltage of ≤1000 V	1. Basic insulation: 2U + 1000 V (where U is the operating voltage, with a minimum of 1500 V AC); 2. Supplementary insulation: 2U + 1750 V (minimum 2250 V AC);3. Reinforced insulation/double insulation: 2U + 2500 V (minimum 3000 V AC; 3750 V AC is commonly used for Class II luminaires)	Leakage current ≤ 10 mA; no breakdown or flashover	Type testing: 1 minute (50 Hz/60 Hz); routine production testing: can be reduced to 1 second (within the limits permitted by the standard)	The voltage waveform is a basic sine wave (total harmonic distortion < 3%); the voltage rises smoothly from zero to the specified value.
GB 9706.1-2020/IEC 60601-1:2020	Various Types of Medical Electrical Equipment (ME Equipment)	1. Basic insulation (1MOPP): 1500 V AC when the operating voltage is ≤250 V, and 500 V AC when the peak voltage is <71 V; 2. Reinforced insulation (2MOPP): Typically 4000 V AC for patient protection; 1000 V AC when the operating voltage is <71 V peak; specific values may be determined according to Table 6 of the standard based on the operating voltage and insulation type.	Leakage current ≤ 10 mA; an uncontrolled, rapid increase in current is considered a breakdown; corona discharge or a single transient flashover is not considered a breakdown.	Standard Test: 1 minute (50 Hz/60 Hz)	Voltage Ramp-Up Procedure: First, apply a voltage not exceeding half of the specified value; gradually increase it to the specified value within 10 seconds; then, within 10 seconds after the test, reduce it to below half of the specified value.