1. Unboxing and Basic Familiarization with the Equipment

1.1 Key Technical Specifications

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 tools. 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 Host and Accessories

Host: 1 LS9955/LS9956 host.

The main components are as follows:

Figure 1

Download links for the electronic user manual, software, warranty card, and other materials have been sent via email. Please download them promptly. If you missed the email, you may 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 220V ±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.

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 casing of the test object is electrically charged; 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;

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 disconnect the test object from the input power supply;

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. Safety Testing Procedures

3.1 Standard Test Parameters (Reference: GB/T 7000.1-2023)

Note: This manual uses GB/T 7000.1-2023 as an example only. If you are referring to other standards, please consult the corresponding standard for the correct test parameters.

3.2 Equipment Wiring

3.2.1 Introduction to the Back Panel and Wiring

Figure 2

3.2.2 Connecting the Test Object

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.

Figure 3

After all connections have been made and verified, turn on the circuit breaker on the back of the device.

3.3 Front Panel Operation

Turn on the device.

Figure 4

Note 1: For leakage current testing, the test voltage must be set to 234 V (using a 220 V test object as an example), i.e., it must match the leakage current test voltage of the connected device.

Note 2: For the LS9956 power test, the test voltage must be set to 220 V (using a 220 V device under test as an example), i.e., it must match the rated power supply of the connected device under test.

3.4 Common Equipment Alarms

3.4.1 NG

Figure 5

Failed the test.

3.4.2 OVER

Figure 6

If the insulation resistance test value exceeds the equipment’s upper measurement limit (2000 MΩ), the test is considered passed.

3.4.3 Adjust

Figure 7

The leakage current test voltage input does not match the leakage current test voltage setting. Refer to sections 4.2.1 and 4.3 for adjustments.

3.4.4 Exceed current break

Figure 8

The current exceeds the equipment’s limit. Please check for a short circuit between the live wire, neutral wire, and ground wire of the device under test.

3.4.5 Open

Figure 9

During the ground resistance test, an open-circuit error is displayed. Refer to Section 4.2.2 for adjustments.

3.5 End of Testing

3.5.1 Shutdown Procedure

Wait for the test to finish or press STOP to stop the test → Turn off the circuit breaker on the back panel → Shut down the unit.

3.5.2 Replacing the Test Object

Wait for the test to finish or press STOP to stop the test → Turn off the circuit breaker on the back panel → Replace the test object → Turn on the circuit breaker on the back panel → Set the parameters and run the test.

4. Using the Software

4.1 Hardware Wiring Adjustments

4.1.1 Connecting the Communication Cables

See 1.2.2.

4.1.2 Connecting the Test Power Supply

If you have purchased a LISUN power supply and your device model is LS9956.

Figure 10

4.1.3 Connecting the Communication Cables

If you have a LISUN power supply, connect the LS9955/LS9956 communication cable and the LISUN power supply communication cable to the RS232 communication box, and then connect the communication box to your computer.

If you do not have a LISUN power supply, connect the LS9955/LS9956 communication cable to the RS232-to-USB adapter and then connect it to your computer.

Note: If your computer has enough RS232 ports, you do not need to use a communication box or a USB adapter cable.

4.2 Software and Driver Installation

Figure 11

Installing the RS232 Communication Box Driver.

Figure 12

RS232-USB adapter cable driver—please double-click to install.

Figure 13

4.3 Software Settings

4.3.1 Communication Port Settings

Click to open the port settings screen.

Figure 14

Figure 15

4.3.2 Test Parameter Settings

Go to the test parameter settings screen.

Figure 16

No password is required; just click “OK” to proceed.

Figure 17

Figure 18

Take the model numbers and limit value groups included with the software as an example.

Figure 19

4.4 Startup Test

4.4.1 Software Readiness

Figure 20

The test items and parameters for this test model in the software are automatically synchronized to the device.

Figure 21

4.4.2 Hardware Execution Testing

After verifying that all connections are correct, turn on the circuit breaker on the back of the device. Then press the Start button on the front panel to begin the test.

You can repeat the test on the device, and the software will automatically record all test data.

4.5 Test Record Management

4.5.1 Real-Time Software Test Data

Figure 22

4.5.2 View Historical Test Data

Figure 23

5. Daily Maintenance and Care of Equipment

5.1 Routine Maintenance

Before turning on the equipment, check that the exterior 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, and contact us to replace parts if necessary; after testing is complete, disconnect the power and wipe the equipment surface and the test area with a dry cloth.

5.2 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; power on the device for 30 minutes each month to prevent the internal electronic components from deteriorating.

6. Troubleshooting and Resolving Common Problems