Set the constant current limit by shorting the output terminals and adjusting the current control knob.

To use constant current on the HY3020E, turn the current knob fully counter-clockwise, then short the positive and negative output leads together. Gradually increase the voltage until the CC indicator lights up. Adjust the current knob to your desired limit, then disconnect the leads to safely apply power to your circuit.

Step-by-Step Setup for Constant Current Mode

Follow these specific steps to configure the device safely before connecting your sensitive components or loads:

1. Power On: Ensure the power supply is turned on with no external load connected to the terminals.
2. Lower Settings: Turn the voltage knob to a low setting, approximately 2.0V, and turn the current knob to the zero position.
3. Short the Terminals: Connect the positive and negative output leads directly to each other to create a temporary short circuit.
4. Activate CC: Check that the CC indicator light is illuminated, which confirms the device is operating in constant current mode.
5. Set Limit: Slowly rotate the current knob clockwise until the digital display shows your required target amperage.
6. Finalize: Disconnect the shorted leads. The unit is now programmed to prevent the current from exceeding this specific value.

Comparison of Current Configuration Methods

Operational Guidelines and Safety

Maintaining the equipment ensures long-term accuracy and safety during high-amperage testing:

• Cable Gauge: Use heavy-duty cables when setting limits near the maximum 20A capacity to prevent insulation melting.
• Heat Management: Ensure the rear ventilation fan is unobstructed to allow proper airflow during continuous high-current operations.
• Mode Transition: The power supply will stay in CV (Constant Voltage) mode until the load resistance forces the current to reach your set limit.
• Verification: Double-check the current limit every time you change your project setup to avoid damaging components.