Ring Wave Generator

1. Unboxing and Basic Familiarization with the Equipment

1.1 Key Technical Specifications

LISUN Model	RWG61000-12	RWG61000-12T	RWG61000-12A	RWG61000-12AT
Output Voltage	0–4 kV		0–6 kV (special order)
Voltage/Current Waveforms	Turn-on voltage rise time: 0.5 μs; short-circuit current rise time: ≤ 1 μs; oscillation frequency: 100 kHz ± 10%
Surge Polarity	Positive, Negative, and Alternating Positive and Negative
Phase Angle	Asynchronous, synchronous 0°–360° or specific angles
Output Impedance	12 Ω, 30 Ω
Coupling and Decoupling Network	Includes a 16A single-phase CDN	Includes 20A 3-phase/5-wire CDN	Includes a 16A single-phase CDN	Includes 20A 3-phase/5-wire CDN
Power Supply	AC 220 V (110 V optional) ±10%, 50/60 Hz
Dimensions (D x W x H)	44 × 45 × 35 cm	44 × 45 × 20 cm, 44 × 45 × 35 cm (CDN)	44 × 45 × 30 cm, 44 × 45 × 20 cm (CDN)	44 × 45 × 30 cm, 44 × 45 × 35 cm (CDN)
Gross Weight	About 28 kg	About 46 kg	About 45 kg	About 48 kg

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 casing with sharp objects. After unpacking, 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

Equipment: RWG61000-12 Ring Wave Generator; ITEU series Isolation Transformers, used to power samples via the Ring Wave Generator.

Note 1: The Ring Wave Generator must be used in conjunction with an Isolation Transformer to protect the power grid; this manual uses the ITEU series of Isolation Transformers as an example.

Standard Accessories:

Number	Note
①	Power Cord for a Ring Wave Generator
②③	Use the built-in CDN power input cable to connect either the output of the Isolation Transformer or the built-in CDN power input of the Ring Wave Generator—choose one of the two.
④⑤	Built-in CDN output cable for connecting to the EUT; choose one of the following
⑥	Ground wire, used to connect to the PGND protective ground terminal
⑦	Coaxial cable, used to connect an external oscilloscope for waveform monitoring
⑧	Discharge tube: used to check whether the device is producing an output in the event of a malfunction.

Figure 1

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1.3 Description of Equipment Structure

1.3.1 Front View of the Device

Number	Note
①	EUT Power Indicator Light
②	High-Voltage Indicator Light
③⑤	Built-in CDN output; simply choose one to connect to the EUT.
④	Source output, used to connect to an external CDN
⑥	Touchscreen
⑦	Oscilloscope Interface: To view the device’s output waveforms, connect it to an oscilloscope using a coaxial cable.
⑧	USB port, for connecting a USB mouse
⑨	Power Switch

Figure 2

1.3.2 Back of the Device

Number	Note
①	Power Cord Connector
②	Remote port; unless otherwise specified, this port has no function.
③	If you have purchased an external CDN, you can connect to it.
④	Built-in CDN Input Power Supply Switch
⑤	The built-in CDN input power supply is used to supply power to the EUT and must be connected to an Isolation Transformer; failure to do so may cause the laboratory circuit breaker to trip.
⑥	For a secure connection, please keep the U-shaped plug inserted; no adjustments are necessary.
⑦	PGND: Protective Ground Terminal. Please ensure proper grounding.

Figure 3

2. Safety Precautions

2.1 Placement Guidelines

Ensure the ambient temperature is between 15°C and 35°C, relative humidity between 10% and 60% (no condensation), and atmospheric pressure between 86 kPa and 106 kPa to prevent high-voltage short circuits or damage to the equipment caused by moisture;

The premises must be free of strong electromagnetic interference, corrosive gases, flammable or explosive materials, and dust, and must be well-ventilated to prevent sparks from causing hazards;

Place it on a stable workbench; avoid tilting or inverting it, and keep it away from sources of vibration;

Isolation Transformer: Keep it at least 0.5 meters away from the main unit to prevent electromagnetic coupling interference;

The equipment must be placed at least 1 meter away from walls and surrounding structures (such as other testing equipment and shelving) to facilitate maintenance; at least 2 meters of space must be left in front of the equipment to ensure smooth operation, and there must be no obstructions in the surrounding area.

2.2 High-Voltage Safety Standards

2.2.1 Security Check

Verify that the equipment’s power supply voltage matches the mains voltage (AC 220 V ±10%, 50/60 Hz), and ensure that the power supply is properly grounded and that the grounding wire is free of damage or looseness;

Grounding Requirements: The host unit’s protective grounding terminal (PGND) must be connected to ground, with a grounding resistance of ≤4Ω, to ensure safe discharge of high voltage;

Operators must have dry hands and must not wear any metal jewelry.

2.2.2 Safety Requirements for Operational Procedures

Operators must undergo professional training and be familiar with this manual and the relevant standards. Non-professionals are prohibited from operating or disassembling the equipment. The equipment contains high-voltage circuits; opening the cover may pose an electric shock hazard. Contact the manufacturer’s technical staff for repairs.

The equipment generates high-voltage, high-current ringing waves during operation. Do not touch the pulse output interface, EUT terminals, or CDN port under any circumstances.

During testing, unauthorized personnel are prohibited from remaining within 1 meter of the EUT to prevent accidental electric shock or interference from electrical discharges.

Before switching connections or replacing the EUT, you must first ensure that the high-voltage output is turned off (the HV indicator light is off) and wait at least 5 minutes to ensure that the internal high-voltage capacitors are completely discharged.

Do not eat or drink during the test to prevent accidents caused by electric shock.

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

2.3 Emergency Response Measures

In the event of an electric shock: Immediately shut off the main power supply to the equipment, move the operator to a safe area, administer first aid if necessary, and contact medical personnel.

Equipment Malfunction (Smoke, Unusual Noises, Unusual Odors): Immediately shut down the equipment and disconnect the power supply; disconnect all wiring; do not turn the equipment back on; contact the manufacturer for repairs.

Abnormal surge output: Pause the test, contact the manufacturer for troubleshooting, and do not touch the test port directly with your hands.

2.4 Other

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

3. Equipment Wiring

3.1 Basic Wiring (Built-in CDN, Default Standard Mode)

Wiring on the back of the device.

Number	Note
①	Power cord: Connect to the appropriate power source according to the markings.
②	The CDN has a built-in power input terminal; connect it to an appropriate Isolation Transformer based on the EUT parameters.
③	PGND: Protective ground wire, connected to earth

Figure 8

Wiring on the front of the device.

Number	Note
①	At the input end of the Isolation Transformer, connect the Isolation Transformer to an appropriate power source based on the EUT parameters.
②	Connect the output of the Isolation Transformer to the input of the built-in CDN power supply for the ringing wave.
③	Built-in CDN output port connected to the EUT

Figure 9

EUT Connection:

Figure 10

Note 1: The EUT must be placed on the left side of the device to prevent the EUT’s connection cables from passing in front of the touchscreen.

Note 2: The EUT must be kept at a safe distance (≥30 cm) from the equipment.

3.2 External CDN Configuration (When an External CDN Is Selected)

Connecting the Ring Wave Generator to an External CDN:

Figure 11

Figure 12

Note: When using an external CDN, all input and output cables for the built-in CDN and all wiring for the EUT must be transferred to the external CDN, and control must be performed using the switches on the external CDN.

4. Introduction to the Touchscreen Program

4.1 Program Startup Screen

Number	Note
①	General Usage Guidelines (This feature is still under development; please do not attempt to use it at this time)
②	System Information Screen
③	Switch Between Chinese and English
④	Program Interface
⑤	Ring Tone Test Interface

Figure 4

4.2 System Information Screen

Click to view historical test logs.

Figure 5

4.3 Program Interface

The testing process can be programmed according to specific requirements, and different test parameters can be set for each step. When the program runs, it automatically adjusts the parameters based on the settings to perform the tests.

Figure 6

4.4 Ring Tone Test Interface

Number	Note
①	Set the Test Voltage and Polarity
②	Set the interval between the two ring tones
③	Set the number of tests
④	Equipment Coupling Direction
⑤	Set the coupling phase angle
⑥	Select Output Impedance
⑦	You can select a pre-built program for testing.
⑧	Display the EUT’s current voltage and current
⑨	Click to turn the EUT’s power on or off
⑩	Return to the Home Screen
⑪	Click to start or stop the test

Figure 7

Note: If you select “Program Test,” the other parameters set on this screen will be invalid.

5. Ring Tone Test

5.1 Confirmation of Test Parameters

5.1.1 Severity Level

Severity Level	Line-to-Line (Differential)	Line-to-Ground (Common Mode)	Use Cases
Level 1	0.5 kV	1 kV	Low-interference environments, such as controlled laboratories
Level 2	1 kV	2 kV	General Industrial Environments
Level 3	2 kV	4 kV	Harsh Industrial Environments
Level 4	4 kV	8 kV	Extreme electromagnetic environments, such as outdoor equipment
Access Level	Special values for voltages higher than 4 kV or lower than 0.5 kV	Special values greater than 8 kV or less than 1 kV	Special Provisions in Product Standards
Output Impedance	12 Ω (AC/DC power cables, shielded interconnects); 30 Ω (unshielded interconnects)

5.1.2 Test Procedure

Parameters	Technical Requirements	Source of the Provisions
Number of applications	5 positive-polarity tests and 5 negative-polarity tests at each test point, for a total of 10 tests	Chapter 8 of the Standard: Test Procedures
Acceleration Rate	Once per minute (every 60 seconds)
Apply Phase	The AC power port should be energized once at the zero-crossing point, once at the peak, and once at a phase angle of 45°.	Ensure coverage under the most severe operating conditions
Coupling Methods	Power ports are coupled via a Coupling and Decoupling Network (CDN); signal/control ports are coupled via a CDN or direct capacitive coupling.	Section 6.2 of the Standard: Coupling and Decoupling Network

5.2 Testing Process (Using a Built-in CDN as an Example)

Adjust the Isolation Transformer’s output voltage according to the EUT’s requirements and supply the power;

Turn on the built-in CDN input power supply switch on the back of the Ring Wave Generator;

On the touchscreen program interface, after setting the test parameters, click “EUT POWER” to turn on the EUT power supply. At this point, the EUT power indicator light on the front panel of the Ring Wave Generator will illuminate;

Set the EUT to its normal operating state in accordance with the EUT product specifications;

Click “START” to begin the ringing wave test.

5.3 Evaluation of Test Results

Level	Evaluation Criteria	Passed or Failed	Typical Symptoms
Grade A (Criterion A)	Performance is completely normal within the specified limits, with no abnormalities whatsoever.	Usually deemed to have passed	No downtime, resets, display glitches, or data loss; key parameters are within acceptable limits.
Grade B (Criterion B)	Temporary loss or reduction in function or performance, but recovery occurs automatically once the disturbance ceases, without requiring operator intervention	Must be arranged in advance; generally acceptable	Automatically resumes after a brief communication interruption; returns to normal after the screen flickers; returns to normal after a brief deviation from specifications
Class C (Criterion C)	Temporary loss or reduction in function or performance that requires manual intervention to restore (e.g., restart, reset)	Must be arranged in advance; acceptable in certain situations	If the equipment freezes, it must be manually restarted; if the program crashes, it must be reloaded; if parameters are abnormal, they must be manually adjusted.
Grade D (Criterion D)	Irreversible loss of functionality or reduced performance due to hardware/software damage or data loss	Determined to be a failure	Components burned out, circuit boards damaged, stored data permanently lost, core functions unable to be restored

6. Post-Test Procedures

6.1 Test Termination

If the EUT is visibly damaged during the test, immediately tap “Stop Test” on the touchscreen and tap “EUT Power” to turn off the EUT’s power.

If no anomalies occur during the test, wait for the ringing tone test to end automatically, then click “EUT Power” to turn off the EUT.

Turn off the CDN input power supply switch built into the host.

Wait 5 minutes to ensure that the high-voltage capacitors inside the main unit have completely discharged, then replace the EUT for testing, or turn off the power to the main unit and the Isolation Transformer.

6.2 Post-Test Preparation and Cleanup

Clean up the test area and wipe it down with a dry cloth. Do not use alcohol or corrosive cleaning agents.

Ring wave testing is a destructive test; it does not automatically generate a test report, but the device automatically saves the test data. You can go to “System Information” to view and export the test log, which can be exported to a USB flash drive via the USB port. The exported file is in TXT text document format.

6.3 Equipment Storage

6.3.1 Short-Term Storage Requirements

If the equipment is used on a daily basis, no further action is required after cleaning is completed following each test.

6.3.2 Long-Term Storage Requirements

If the device will not be used for an extended period (more than one month), please disconnect all cables and cover the device with a dust cover to prevent dust buildup.

The device should be powered on once a month for just half an hour to prevent the aging of electrical components (such as capacitors and contactors).

7. Troubleshooting and Resolving Common Problems

7.1 The device won’t turn on

Symptom: After turning on the power switch, the device shows no response (the indicator light does not come on, and the fan does not spin).

Possible causes: ① The power cord is not properly connected or is damaged; ② Abnormal supply voltage; ③ A blown fuse; ④ A burned-out varistor (MOV).

Solution: Ensure the power cord is intact and securely connected. Power supply issues—such as unstable voltage, excessively high voltage, or harmonic interference—can cause the fuse or varistor to burn out. We recommend using a voltage-stabilized, pure sine wave AC power supply to power the device. Replace the fuse or varistor with one of the same type.

The figure below shows the location of the fuse:

Figure 13

The figure below shows the location of the MOV (metal-oxide varistor) inside the filtered power supply:

Figure 14

7.2 Circuit Breaker Tripping in the Laboratory

Symptom: When a ringing wave is output, the laboratory ground-fault circuit interrupter trips.

Possible cause: The Isolation Transformer is not connected.

Solution: Connect an Isolation Transformer. During ringing wave tests, large transient pulse currents are generated; if an Isolation Transformer is not connected, it may cause the laboratory’s ground-fault circuit interrupter to trip.

7.3 Automatic Device Restart

Symptom: The device automatically restarts when a surge occurs.

Possible cause: The ground wire is not properly connected.

Solution: Connect the PGND grounding terminal on the back of the host to ground, and ensure that the grounding resistance is ≤4Ω. Otherwise, high voltage may not be safely dissipated, causing the device to automatically restart.

7.4 Surge Phase Angle Test Failed

Symptom: The synchronization phase angle was set, but the ringing test did not follow the corresponding phase angle.

Possible cause: The EUT power is not turned on.

Procedure: The EUT must be powered by an AC source, and it must be turned on during testing so that the surge generator can detect the EUT’s power waveform and perform the surge test according to the set phase angle.

7.5 The waveform contains interference

Symptom: When using a CRO connected to an oscilloscope port to examine ringing and surge waveforms, some noise becomes visible upon magnifying the waveform.

Possible cause: The CRO port is designed for user convenience, allowing quick and easy access to waveform data, but it may generate a small amount of noise.

Procedure: If you need to obtain the actual output waveform of the surge generator, or if you wish to calibrate the device, use an oscilloscope and a high-voltage probe to directly inspect the waveform at the CDN output.