East Tester Programmable DC Electronic Load User Manual

1. Introduction

The East Tester ET54XXA+ series programmable DC electronic load provides high resolution and precision for various testing applications. These units are designed for use in testing chargers, switching power supplies, linear power supplies, batteries, and other production line components, as well as for research and development in institutional settings.

Key features include a user-friendly design with a 2.8-inch TFT LCD screen, multiple high-performance load modes, and comprehensive safety protections.

2. Safety Information

Always ensure stable and safe operation by connecting the load and the source to be tested according to red (positive) and black (negative) polarity before powering on. Turn on the source output first, then the load.

2.1 Multiple Safety Protection

The device is equipped with multiple protection functions to ensure safety and prevent damage. These include:

• Overcurrent Protection (OC)
• Overvoltage Protection (OV)
• Overpower Protection (OP)
• Overtemperature Protection (OT)
• Input Polarity Reverse Connection Prompt (RV)

Overvoltage and overcurrent parameters can be flexibly set to protect the load effectively. The intelligent fan speed control function reduces noise during operation.

When the load is in a protection state, other button functions are invalid until the protection state is exited by pressing the [ENT] button.

3. Product Overview

3.1 Front Panel Layout

The front panel features a 2.8-inch TFT LCD screen for rich display content, along with various buttons and a knob for operation.

3.2 Rear Panel Layout

The rear panel includes heat emission holes, power supply port, fuse block, externally triggered input, and a USB interface.

3.3 Standard Accessories

• Main machine: 1 unit
• Power cable: 1
• Certificate of Qualification: 1 copy
• Paper manual: 1 copy
• Fuse: 2

4. Setup

4.1 Initial Connection

1. Ensure the electronic load is powered off.
2. Connect the load and the source to be tested. Always connect the positive terminal of the source to the red (positive) input terminal of the electronic load, and the negative terminal of the source to the black (negative) input terminal of the electronic load.
3. Connect the power cable to the power supply port on the rear panel and plug it into a suitable power outlet (100Vac~240Vac, 50/60Hz).
4. If using external communication, connect the USB cable to the USB interface on the rear panel.

4.2 Power On/Off

1. Turn on the source output first.
2. Press the red "POWER" button on the front panel to turn on the electronic load.
3. To turn off, press the "POWER" button again.

5. Operating Instructions

5.1 LCD Front Panel and Button Overview

The 2.8-inch TFT LCD screen displays measurement values, settings, and various identifiers. Operation is primarily done via the rotary knob, 9 regular function buttons, and 4 common shortcut buttons.

5.2 Basic Mode Operations

The electronic load supports six basic measurement modes: Constant Current (CC), Constant Voltage (CV), Constant Resistance (CR), Constant Power (CP), Constant Current-Constant Voltage (CC+CV), and Constant Resistance-Constant Voltage (CR+CV).

To select a mode, press the [MODE] button, use arrow buttons to navigate, and [ENT] to confirm. Shortcut buttons [CC], [CV], [I_R], [V_R] are available for quick selection and range switching.

5.2.1 Constant Current (CC) Mode

In CC mode, the load draws a constant current regardless of input voltage changes. To set parameters:

1. Press [CC] button to enter CC mode measurement interface.
2. Use [I_R] [V_R] buttons to quickly switch current/voltage ranges.
3. Select operation item with arrow buttons, press [ENT] to edit.
4. Adjust values using arrow buttons and the knob. Press [ENT] or [ESC] to confirm/exit.
5. Press [ON] to start/stop the selected channel.

5.2.2 Constant Voltage (CV) Mode

In CV mode, the load draws current to maintain the input voltage at a set value. Follow similar steps as CC mode, using [CV] button to enter CV mode.

5.2.3 Constant Resistance (CR) Mode

In CR mode, the load acts as a constant resistance, drawing current that changes with input voltage. Use [MODE] to select CR mode.

5.2.4 Constant Power (CP) Mode

In CP mode, the load consumes constant power, adjusting current as input voltage changes. Use [MODE] to select CP mode.

5.2.5 Constant Current-Constant Voltage (CC+CV) Mode

This mode prevents damage from overcurrent discharge. If the source cannot output the set current, the load switches from CC to CV mode. Use [MODE] to select CC+CV mode.

5.2.6 Constant Resistance-Constant Voltage (CR+CV) Mode

Similar to CC+CV, this mode switches from CR to CV if the source cannot maintain the set resistance. Use [MODE] to select CR+CV mode.

5.3 Advanced Test Functions

5.3.1 Dynamic Test (Tran Test)

Tests dynamic characteristics by repeatedly switching between two load values (current or voltage). Modes include Continuous, Pulse, and Trigger. Set parameters via [SET] button in dynamic test interface.

5.3.2 List Test

Simulates various loading status changes for production line testing. You can edit test steps, parameters, and set stepping mode (continuous/trigger) and cycling. Access via [MODE] then "List".

5.3.3 Scan Test

Detects continuous working state within a range, capturing critical parameters like protection current and break-over voltage. Set start/end points, stepping amount, and delay. Access via [MODE] then "Scan".

5.3.4 Battery Test

Measures battery discharge performance in CC or CR mode. Cut-off conditions can be set by voltage, time, energy, or capacity. Access via [MODE] then "Battery".

Video 5.1: Demonstration of battery test setup and operation on the ET5410A+.

5.3.5 LED Test

Simulates real LED lamp characteristics, reflecting LED driving power and load capacity. Access via [MODE] then "LED".

5.3.6 Short Circuit Test

Simulates a load short circuit at the input end. Actual current consumed depends on the source's maximum output power. Access via [MODE] then "Short".

5.4 System Settings

Press [MENU] to access system settings. Options include Load Set, System Set, Communication Set, Qualified Set, System Information, Load Effect Test, and Remote Compensation.

5.4.1 Button Lock Function

To prevent accidental operations, the device has a button lock function. Long press [ENT] for 3 seconds to toggle between locked and unlocked states. A locked icon appears on the screen when active.

5.4.2 Communication Port and External Interface

The ET54XXA+ series supports USB, RS232 (optional), and RS485 (optional) communication. External interfaces include status output and trigger input.

6. Maintenance

6.1 General Care

• Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
• Avoid exposing the device to extreme temperatures or humidity.
• Ensure proper ventilation by not blocking the heat emission holes on the side and rear panels.

6.2 Fuse Replacement

If the device does not power on or experiences power-related issues, check the fuse located in the fuse block on the rear panel. Replace with a fuse of the same rating if necessary.

7. Troubleshooting

The device includes several protection mechanisms. If a protection state is triggered, an alert will be displayed on the screen. Press [ENT] to clear the alert and exit the protection state.

7.1 Protection Types and Reasons

8. Specifications

8.1 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℃ to 40℃
• Storage temperature: -10℃ to 70℃
• Relative humidity: < 80%
• Interface: standard USB, optional RS232 (or 485)
• Size: 90mm × 190mm × 300mm (width × height × depth)
• Main Machine Net Weight: 2.9kg

9. User Tips

• For precise measurements, ensure all connections are secure and use appropriate gauge wires to minimize voltage drop.
• When performing battery tests, always monitor the battery temperature to prevent overheating.
• Utilize the key lock function during long tests or in busy environments to prevent accidental changes to settings.
• Familiarize yourself with the different test modes (CC, CV, CR, CP, Dynamic, List, Scan, Battery, LED, Short Circuit) to select the most suitable one for your specific application.
• Regularly check the heat emission holes for any obstructions to ensure efficient cooling and prolong the device's lifespan.

10. Warranty and Support

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

A PDF version of this user manual is available for download. Please refer to the official user manual (PDF) for additional details and comprehensive instructions.