East Tester ET54A+ Series Programmable DC Electronic Load

1. Introduction

The East Tester ET54A+ series programmable DC electronic load offers high resolution (1mV/1mA) and precision for various testing applications. These devices are equipped with a 2.8-inch TFT LCD screen, providing rich display content and an intuitive interface for ease of use. They support 12 common modes and comprehensive test functions, making them suitable for testing chargers, switching power supplies, linear power supplies, batteries, and other production line and research applications.

The ET54A+ series includes single-channel models like ET5410A+ and ET5411A+, and a dual-channel model, ET5420A+.

Figure 1: East Tester ET54A+ Series Electronic Loads

2. Safety Precautions

To ensure stable and safe operation, always connect the load and the source to be tested according to the correct polarity (red for positive, black for negative) before powering on. Turn on the source output first, then the electronic load.

Multiple Safety Protection Features:

• Overcurrent Protection (OC): Input current exceeds the set limit value.
• Overvoltage Protection (OV): Input voltage exceeds the set limit value.
• Overpower Protection (OP): Input power exceeds the set limit value.
• Overtemperature Protection (OT): Radiator temperature exceeds 85°C.
• Input Polarity Reverse Prompt (RV): Alerts if input polarity is incorrect.

When the load is in a protection state, most button functions are disabled. Press the [ENT] button to exit the protection state.

3. Product Overview

3.1 Dimensions

Figure 2: Product Dimensions (approx. 90mm W x 190mm H x 300mm D)

The device features a retractable handle for portability.

3.2 Front Panel Controls

Figure 3: ET5410A+ Single Channel Front Panel

Figure 4: ET5420A+ Dual Channel Front Panel

The front panel includes:

• LCD Screen: 2.8-inch TFT display for measurement values and settings.
• Adjustment Knob: For adjusting numerical values.
• Power Button: To turn the device on/off.
• Cooling Port: For heat dissipation.
• Positive/Negative Terminal Interfaces: For connecting the load.
• Mode Keys (CC, CV, I_R, V_R): Shortcut buttons for Constant Current, Constant Voltage, Current Range, and Voltage Range.
• Navigation Keys (Arrow keys): For menu navigation and digit selection.
• ESC Key: Return to previous interface or quickly return to measurement interface.
• ENT Key: Enter selection, confirm input, or switch button lock/unlock.
• MODE Key: Enter mode selection interface.
• MENU Key: Enter system menu interface.
• SET Key: Enter mode setting interface.
• CH Key: Switch channel (for dual-channel models).
• TRIG Key: Trigger function.
• ON/OFF Key: Start or close the mode of the selected channel.

3.3 Rear Panel Interfaces

Figure 5: Rear Panel

The rear panel includes:

• Power Outlet: For connecting the power cord.
• Fuse Box: Contains the power fuses.
• Cooling Port: Additional ventilation.
• USB Host Interface: For remote operation and data transfer.
• Optional RS232/485 Interface: For advanced remote communication.
• External Trigger Input (DB9 interface): For external trigger signals.

4. Specifications

Figure 6: Model Comparison Table

Figure 7: Detailed Technical Specifications

General Technical Specifications:

• Power Supply Voltage: 100Vac±10%~240Vac±10%, 50/60Hz
• Display: 2.8-inch TFT LCD screen with resolution of 320×240
• Operating Temperature: 0°C to 40°C
• Storage Temperature: -10°C to 70°C
• Relative Humidity: < 80%
• Interface: Standard USB, optional RS232 (or 485)
• Size (W × H × D): 90mm × 190mm × 300mm

Standard Accessories:

• Power cord × 1
• Power fuse × 2
• User manual × 1

5. Initial Setup

5.1 Connecting the Load

1. Ensure the electronic load is powered off.
2. Connect the source to be tested to the input terminals: red for positive (+), black for negative (-).
3. Connect the power cord to the power outlet on the rear panel and then to a suitable AC power source.
4. Turn on the source output first, then power on the electronic load using the front panel Power button.

5.2 System Settings

Press the [MENU] button to enter the system menu. Use the arrow buttons (▲▼◀►) to navigate and [ENT] to select. Key system settings include:

• Load Set: Configure load range, limit values, off delay, and voltage compensation.
• System Set: Set default values, language (Chinese/English), button tone, warning tone, and factory reset options.
• Communication Set: Configure local address and baud rate for communication.
• Qualified Set: Define conditions for qualified tests (voltage, current, power limits).
• System Information: View product model, serial number, hardware, and software versions.
• Remote Compensation: Measure and compensate for voltage drop on connection lines.

6. Operation

The ET54A+ series supports various measurement and test modes. Navigation is primarily done using the arrow keys, [ENT] for selection, and [ESC] to go back.

Figure 8: Multiple Measurement Modes

6.1 Basic Measurement Modes

The electronic load can operate in Constant Current (CC), Constant Voltage (CV), Constant Resistance (CR), Constant Power (CP), and combined modes (CC+CV, CR+CV).

To select a mode, press the [MODE] button, navigate with arrow keys, and press [ENT].

• Constant Current (CC) Mode: Maintains a constant current regardless of input voltage changes. Press [CC] shortcut button to enter.
• Constant Voltage (CV) Mode: Consumes current to maintain a set input voltage. Press [CV] shortcut button to enter.
• Constant Resistance (CR) Mode: Acts as a constant resistance, current changes with input voltage.
• Constant Power (CP) Mode: Consumes constant power, current adjusts with input voltage.
• CC+CV Mode: Switches from CC to CV if the source cannot output the set current, preventing overcurrent discharge.
• CR+CV Mode: Switches from CR to CV if the source cannot output enough current to maintain set resistance.

General Operation for Setting Parameters:

1. Press [MODE] (or shortcut key like [CC]/[CV]) to enter the desired measurement mode interface.
2. Use [I_R] and [V_R] buttons to quickly switch current and voltage ranges.
3. Select the parameter to edit using arrow buttons (▲▼◀►).
4. Press [ENT] to enter edit mode.
5. Use arrow buttons (◀►) to select digits and (▲▼) to adjust values.
6. Press [ENT] or [ESC] to confirm/exit editing.
7. Press [ON/OFF] to start or stop the selected mode.

6.2 Dynamic Test Operation

This mode tests the dynamic characteristics of a source by repeatedly switching between two load values (A and B). It supports Continuous, Pulse, and Trigger modes.

• Continuous Mode: Continuously switches between value A and value B after starting the test.
• Pulse Mode: Switches from A to B upon receiving a trigger signal, then back to A after a set pulse-width time.
• Trigger Mode: Switches between A and B each time a trigger signal is received, ignoring pulse-width settings.

6.3 List Test Operation

The list test function allows for automatic testing under various load conditions by presetting a sequence of test steps and parameters. This is useful for production line testing.

6.4 Scan Test Operation

Scan test detects continuous operation within a range, capturing critical parameters like protection current and break-over voltage. It can scan by constant current, voltage, or power, with configurable stepping amount and delay.

6.5 Battery Test Operation

This function detects battery discharge performance in constant current (CC) or constant resistance (CR) modes. Cut-off conditions can be set based on voltage, time, energy, or capacity. The device automatically measures discharge capacity and energy.

6.6 LED Test Operation

The CR-LED test simulates real LED lamp characteristics, starting when the input voltage exceeds the turn-on voltage of the diodes. Parameters like stable working voltage, output current, and voltage proportion on RD can be configured.

6.7 Short Circuit Test Operation

This mode simulates a short circuit at the input, with the actual current consumed depending on the source's maximum output.

7. Maintenance

• Cleaning: Keep the device clean and free from dust. Use a soft, dry cloth for cleaning. Do not use liquid cleaners.
• Cooling: Ensure the cooling ports on the front and rear panels are unobstructed to allow for proper airflow. The intelligent fan speed control function helps reduce noise during operation.
• Data Storage: The device maintains data storage in case of power failure.
• Fuse Replacement: If the device does not power on, check and replace the power fuses located in the fuse box on the rear panel if necessary. Always use fuses of the correct rating.

8. Troubleshooting

8.1 Protection Functions

The device includes several protection mechanisms. If a protection event occurs, a prompt will be displayed on the screen. Press [ENT] to clear the protection state.

9. User Tips

• Always refer to the detailed instructions in this manual for specific test modes and parameter settings to ensure accurate and safe operation.
• Utilize the key lock function to prevent accidental changes during long tests.
• For remote control, ensure correct communication port settings (RS232/485) and USB connection.

10. Warranty and Support

For technical support, service, or warranty inquiries, please contact the manufacturer:

Please retain your purchase receipt for warranty purposes.