XY-KZ25/KZ35 Constant Current Electronic Load User Manual

1. Introduction

The INTNIUB XY-KZ25 and XY-KZ35 are constant current electronic loads designed for precise battery testing, discharge capacity measurement, and power aging tests. These devices feature intelligent temperature control, multiple fast charging trigger protocols, and comprehensive protection mechanisms, making them suitable for various electronic testing applications.

The KZ25 model supports up to 25W discharge power and 4.00A current, while the KZ35 supports up to 35W discharge power and 5.00A current.

2. Safety Information

• Ensure the device is used within its specified voltage and current limits to prevent damage.
• Do not expose the device to moisture or extreme temperatures.
• Always connect the load correctly to avoid reverse polarity issues. The device includes reverse connection protection, but caution is advised.
• Keep out of reach of children.
• The device can generate heat during operation; ensure adequate ventilation.

3. Package Contents

• 1x XY-KZ25/KZ35 Constant Current Electronic Load Tester

4. Specifications

The following table details the specifications for both the XY-KZ25 and XY-KZ35 models:

Image: Comparison table detailing specifications for both KZ25 and KZ35 models, including rated operational voltage, max discharging power, rated operational current, fan speed, quick charge trigger modes, constant current accuracy, voltage accuracy, heat dissipation method, working temperature, expansion port, and various protection settings (OVP, OCP, OPP, LVP, OTP).

Image: Diagram illustrating the dimensions (100mm length, 46mm height, 26mm depth) and weight (65g) of the electronic load.

5. Setup

5.1 Component Identification

Image: Detailed labeled diagram of the electronic load's components, including USB Public Header Interface, Type-C interface, MicroUSB interface, External wiring terminals, LCD display, Coded potentiometer key, ON/OFF button, Trigger button (TRG), and All-aluminium black radiator.

• USB Public Header Interface: Standard USB-A port for connecting devices to be tested (Max current 5A).
• Type-C Interface: USB Type-C port for connecting devices (Max current 5A).
• MicroUSB Interface: MicroUSB port for connecting devices (Max current 2A, does not support decoy).
• External Wiring Terminals: For general load use, allowing connection to external power sources or loads. Rated voltage DC4.0-25.0V.
• LCD: Displays current, voltage, power, capacity, and discharge time.
• Coded Potentiometer Key: Rotary encoder for adjusting current and navigating settings. Press to confirm.
• ON/OFF Button: Powers the device on or off.
• Trigger Button (TRG): Used for fast charging protocol triggering.
• All-aluminium Black Radiator: Ensures good heat dissipation.

5.2 Initial Connection

1. Connect the power source or device to be tested to one of the input interfaces (USB-A, Type-C, MicroUSB, or external wiring terminals).
2. Ensure the input voltage is within the rated working voltage of DC 4.0-25.0V.
3. Press the ON/OFF button to power on the electronic load. The LCD will illuminate and display current readings.

6. Operation

6.1 Basic Display and Current Adjustment

• The LCD continuously displays real-time current (A), voltage (V), power (W), accumulated discharge capacity (Ah), and discharge time.
• To adjust the constant current, rotate the Coded Potentiometer Key. The current can be precisely adjusted to an accurate 0.01A.
• Press the Coded Potentiometer Key briefly to lock the current setting, preventing accidental changes during testing. Press again to unlock.

6.2 Fast Charging Trigger Function

The device supports mainstream fast charging protocols for testing chargers and power banks.

Image: Diagram titled "Intelligent upgrade, decoy trigger" showing the LCD displaying real-time voltage and triggered protocol. It explains how to use the TRG button for protocol selection and the rotary encoder for triggering.

Image: Diagram titled "Deception Support Mainstream Fast Charging Protocol" illustrating various fast charging modes (QC2.0, QC3.0, AFC, FCP) as displayed on the LCD, including voltage gears for QC2.0 and QC3.0.

1. Short press the TRG button: This enters the trigger protocol selection interface.
2. Rotate the Coded Potentiometer Key: Select the desired fast charging protocol (QC2.0, QC3.0, AFC, FCP). The LCD will dynamically display the selected protocol.
3. Short press the Coded Potentiometer Key: This triggers the selected protocol. The LCD will display "--" briefly as it attempts to negotiate the fast charge.
4. Long press the TRG button: This allows you to test which fast charging modes a connected charger supports. The device will cycle through supported protocols.

6.3 Protection and Advanced Settings

The device offers various protection settings and advanced functions to ensure safe and automated testing. To enter the setting interface, long press the Coded Potentiometer Key.

Image: Diagram titled "Long Press Encoder Potentiometer Entering Setting Interface" showing LCD screens for configuring various protection and operational settings: Overvoltage Protection (OVP), Overcurrent Protection (OCP), Overpower Protection (OPP), Undervoltage Protection (LVP), Maximum Capacity (OAH), Maximum Discharge Time (OHP), Data Group (DAT), Manual/Automatic Resume (REC), and Automatic Fast Charging Trigger (AUTO).

Once in the setting interface, rotate the potentiometer to select a setting and press it to enter adjustment mode. Rotate again to change the value, and press to confirm.

• OVP (Overvoltage Protection): Set the maximum allowable input voltage. Default: 25.2V.
• OCP (Overcurrent Protection): Set the maximum allowable discharge current. Default: KZ25 (4.10A), KZ35 (5.10A).
• OPP (Overpower Protection): Set the maximum allowable discharge power. Default: KZ25 (25.5W), KZ35 (35.5W).
• LVP (Undervoltage Protection): Set the minimum allowable input voltage. If the voltage drops below this, discharge stops. Default: 4.0V.
• OAH (Maximum Discharge Capacity): Set the maximum accumulated discharge capacity (in Ah). Once reached, discharge stops. Useful for unattended power aging tests. Default: 0.000Ah (disabled).
• OHP (Maximum Discharge Time): Set the maximum discharge duration (in hours). Once reached, discharge stops. Useful for unattended power aging tests. Default: 00:00h (disabled).
• DAT (Data Group Function): Choose whether to accumulate capacity and running time from previous stages. Default: 0 (disabled).
• REC (Manual/Automatic Resume): Configures how the load resumes operation after a protection mechanism is triggered. Options include manual resume or automatic resume. Default: OFF.
• AUTO (Automatic Fast Charging Trigger): Set whether the device automatically triggers the fast charging function upon power-on. Default: ON.

6.4 Intelligent Temperature Control Fan

• The integrated fan automatically activates when the discharge power exceeds 10W or the internal temperature rises above 40℃ to ensure efficient heat dissipation and stable operation.

7. User Tips

• For long-duration tests or power aging, utilize the OAH (Maximum Discharge Capacity) and OHP (Maximum Discharge Time) settings to automate the process and prevent over-discharge.
• Always lock the current setting using a short press of the potentiometer key after adjustment to avoid accidental changes during critical tests.
• When testing fast chargers, use the 'long press TRG' function to quickly identify all supported protocols of the charger.
• Ensure good airflow around the device, especially during high-power discharge, to aid the intelligent fan in heat dissipation.

8. Maintenance

• Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents. Ensure no liquids enter the device.
• Storage: Store the electronic load in a cool, dry place away from direct sunlight and moisture when not in use.
• Inspection: Periodically check for any visible damage to the casing or connectors.

9. Troubleshooting

10. Warranty and Support

This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. For warranty claims, technical support, or service inquiries, please contact your original point of purchase or the manufacturer directly. Please retain your proof of purchase for warranty validation.