1. Introduction
The BSIDE I84020 is a programmable DC power supply designed for laboratory and industrial applications. It offers a wide range of voltage and current outputs, dynamically adapting to various load requirements up to 300W. Key features include precise adjustment capabilities, a clear 4-digit 6-line color display, stable output with low ripple and noise, and comprehensive safety protections. It also supports remote control via USB communication.
2. Package Contents
- 1 x BSIDE I84020 Programmable DC Power Supply
- 1 x Standard Power Cable (EU plug)
- 1 x Set of Test Leads with Banana Plugs
- 1 x USB Communication Cable
- 1 x English User Manual
3. Product Overview
3.1. Wide Range Dynamic Output
The power supply features a wide dynamic output range, allowing flexible adjustment of voltage and current to meet diverse load demands without reducing the total 300W power. For example, it can provide 30V 10A or 40V 7.5A.

Image: Illustration of the wide range dynamic output capability of the BSIDE I84020 power supply.
3.2. Precise Adjustment and Display
Current and voltage settings are easily configured with precision using push buttons and an encoder knob. The unit features a colorful, clear 4-digit 6-line display with a 320*240 resolution, showing voltage, current, power, and output time. This ensures stable and accurate values.

Image: Close-up of the BSIDE I84020 front panel, highlighting the dual fine-tuning controls for precise voltage and current adjustments.

Image: The BSIDE I84020 displaying accurate 4-digit readings, with a multimeter confirming the precision of the output.
3.3. Stability and Cooling
The compact design incorporates a dual panel and highly integrated chip for stable output, reduced ripple, and lower noise. An intelligent, quiet cooling fan activates based on power usage, ensuring precise temperature control and consistent performance.
3.4. Safety Features
Equipped with an integrated fuse and quadruple protection mechanisms: Over Voltage Protection (OVP), Over Current Protection (OCP), Over Temperature Protection (OTP), and Over Power Protection (OPP). OVP and OCP values are adjustable (max. 41V 20.5A). When triggered, the output automatically shuts off to protect connected equipment. The power supply is designed to adapt to AC 220V ± 10% voltage fluctuations.

Image: Visual representation of the BSIDE I84020's robust security performance, including overvoltage, overcurrent, over temperature, and short circuit protection.
3.5. USB Fast Charging and Communication
The unit includes 5V/2A USB ports for fast charging electronic devices. It also features USB, RS232, and RS485 communication ports, allowing for remote control via custom PC software.

Image: The BSIDE I84020 demonstrating its USB fast charging capability, powering a smartphone.
4. Setup
4.1. Power Connection
Before connecting the power supply, ensure the input voltage switch on the rear of the unit is set correctly for your region (110V or 220V). Connect the provided power cable to the unit and then to a suitable AC outlet.
Video: This video demonstrates the physical overview of a similar power supply, including the rear panel where the 115V/230V voltage selector switch is located. It shows how to adjust this switch according to the local voltage.
4.2. Connecting the Load
Connect your test leads to the output terminals (red for positive, black for negative) on the front panel. Ensure proper polarity when connecting to your device or circuit. Turn on the power supply using the main power switch.
5. Operating Instructions
5.1. Voltage and Current Adjustment
Use the coarse and fine adjustment knobs for voltage and current to set the desired output levels. The 4-digit display provides precise readings. The encoder knob allows for fine-tuning individual digits.
Video: This video demonstrates the precise adjustment of voltage and current using the coarse and fine tuning knobs on a similar power supply, highlighting the accuracy of the digital display.
5.2. Memory Functions
The power supply can store up to 3 sets of commonly used voltage and current parameters. These can be quickly recalled by pressing the corresponding memory buttons (1, 2, or 3).

Image: The BSIDE I84020's display showing the memory storage feature, allowing users to save and recall up to three sets of voltage and current settings.
5.3. Over Current Protection (OCP)
The OCP function automatically interrupts the output and triggers an alarm in case of a short circuit or overcurrent condition, protecting your equipment. OCP values can be set up to 20.5A.
Video: This video demonstrates the Over Current Protection (OCP) function on a similar power supply. It shows the output being automatically cut off and an alarm sounding when a short circuit is detected.
5.4. USB Charging
Utilize the 5V/2A USB-A and USB-C ports on the front panel to quickly charge compatible electronic devices.
Video: This video demonstrates the USB fast charging capability of a similar power supply, showing a smartphone being charged via the integrated USB ports.
6. Maintenance
6.1. General Care
Keep the power supply in a clean, dry environment. Avoid exposing it to excessive dust, moisture, or extreme temperatures. Do not block the ventilation openings.
6.2. Cleaning
To clean the unit, disconnect it from the power source. Use a soft, dry cloth to wipe the exterior. Do not use abrasive cleaners or solvents. Ensure no liquids enter the device.
7. Troubleshooting
7.1. No Output
- Check if the power cable is securely connected and the main power switch is ON.
- Verify the input voltage switch on the rear is set correctly (110V/220V).
- Ensure the output is enabled (check the output indicator on the display).
- Check for OCP/OVP activation. If activated, clear the fault and reset the output.
7.2. Incorrect Readings
- Ensure test leads are properly connected and not damaged.
- Verify the multimeter used for comparison is calibrated and functioning correctly.
- Check for any loose connections in the circuit.
7.3. Unit Overheating
- Ensure ventilation openings are clear and not obstructed.
- Reduce the load if operating at maximum capacity for extended periods.
- Verify the cooling fan is operating.
8. Specifications
| Feature | Specification |
|---|---|
| Output Voltage | DC 0-40.5V (max), 10mV resolution, Accuracy: ≤0.1%+5 digits |
| Output Current | DC 0-20.1A (max), 10mA resolution, Accuracy: ≤0.1%+10 digits |
| Output Power | 0-300W |
| Voltage Ripple | ≤12mVrms |
| Current Ripple | ≤18mVrms |
| Load Regulation | ≤0.2%Vmax+5mV |
| OVP Range | DC 0-41V |
| OCP Range | DC 0-20.5A |
| Operating Voltage | AC 220V±10% 50Hz or AC 110V±10% 60Hz |
| Operating Temperature | 0℃~40℃, Humidity: ≤80%RH |
| Storage Temperature | -20℃~60℃, Humidity: ≤80%RH |
| Communication Interface | USB, RS232, RS485 |
| Dimensions | 230 x 150 x 80 mm (9.06 x 5.91 x 3.15 inches) |
| Weight | 1.46 kg (3.22 lbs) |
| Material | PC (Polycarbonate) |
9. Warranty and Support
9.1. Warranty Information
This product comes with a standard manufacturer's warranty. Please refer to the warranty card included in your package or contact the seller for specific details regarding warranty duration and coverage.
9.2. Technical Support
For technical assistance, troubleshooting, or any questions regarding the BSIDE I84020 Programmable DC Power Supply, please contact the seller or manufacturer's customer support. Contact information can typically be found on the product packaging or the seller's website.



