1. Introduction
Thank you for choosing the YIHUA 3005D Digital Program-Controlled Switching DC Power Supply. This device is designed for laboratory and professional use, offering adjustable voltage and current output with advanced features for precision and safety. Please read this manual thoroughly before operation to ensure proper usage and to maximize the lifespan of your equipment.
2. Package Contents
Upon unpacking, please verify that all items listed below are present and in good condition:
- YIHUA 3005D DC Power Supply Unit
- Power Cable (with appropriate plug for your region)
- Test Leads (red and black with alligator clips)
- Instruction Manual
- Certificate Card
Image: YIHUA 3005D DC Power Supply unit and included accessories.
3. Product Overview
Familiarize yourself with the various parts of your YIHUA 3005D power supply.
3.1 Front Panel
The front panel features a digital display for current and voltage, along with various control buttons and output terminals.
Image: Close-up of the front panel showing the display, control buttons, and output terminals.
- Digital Display: Shows real-time current (A) and voltage (V) output. Also displays protection indicators (OCP, OVP).
- Memory Buttons (1, 2, 3): Store and recall frequently used voltage/current settings.
- OCP (Over Current Protection) Button: Activates/deactivates over-current protection.
- RF (Radio Frequency) Button: Activates RF signal detection mode.
- SOUND Button: Toggles button press sound.
- LOCK Button: Locks most control buttons to prevent accidental changes.
- CURRENT Button: Selects current for adjustment.
- VOLTAGE Button: Selects voltage for adjustment.
- Setting (+/-) Buttons: Adjust selected voltage or current values.
- Constant Voltage/Current Presets (4.2V 2A, 19V 5A): Quick access to common fixed output settings.
- OUTPUT OFF/ON Button: Toggles the power output to the terminals.
- Output Terminals: Red (positive), Yellow (ground/common), Black (negative) for connecting test leads.
3.2 Rear Panel
The rear panel includes the main power input and ventilation.
Image: Rear view of the power supply, showing the power input socket and ventilation grilles.
- Power Input Socket: For connecting the provided power cable.
- Fuse Holder: Contains the main fuse for protection.
- Ventilation Grilles: Allow for passive heat dissipation.
3.3 Other Features
- Carry Handle: A convenient handle on top for portability.
- Rubber Feet: Sturdy rubber feet on the bottom provide stability and prevent slipping.
Image: Top view of the power supply, highlighting the integrated carry handle.
4. Setup
- Placement: Place the power supply on a stable, level surface with adequate ventilation. Ensure no objects block the side or rear ventilation grilles.
- Power Connection: Connect the provided power cable to the power input socket on the rear panel of the unit and then to a suitable AC power outlet (220V 50Hz or 110V 60Hz, depending on your model).
- Test Lead Connection: Connect the test leads to the output terminals on the front panel. The red lead connects to the positive (+) terminal, and the black lead connects to the negative (-) terminal. The yellow terminal is typically for ground/common.
5. Operating Instructions
5.1 Basic Operation
- Power On: Flip the main power switch located on the front panel to the 'ON' position. The digital display will illuminate.
- Adjusting Voltage:
- Press the VOLTAGE button. The voltage display will become active for adjustment.
- Use the + and - buttons under 'Setting' to increase or decrease the desired output voltage.
- Adjusting Current Limit:
- Press the CURRENT button. The current display will become active for adjustment.
- Use the + and - buttons under 'Setting' to set the maximum current limit.
- Enable Output: Once voltage and current limits are set, press the OUTPUT OFF/ON button. The button will light up green, indicating that power is being supplied to the output terminals.
- Disable Output: Press the OUTPUT OFF/ON button again to turn off the power output. The green light will extinguish.
5.2 Memory Functions
The unit allows you to store and recall up to three sets of voltage and current settings.
- To Save Settings: Set your desired voltage and current. Press and hold one of the MEMORY (1, 2, or 3) buttons until it lights up, indicating the settings have been saved.
- To Recall Settings: Briefly press one of the MEMORY (1, 2, or 3) buttons. The stored settings will be loaded onto the display.
5.3 Protection Features
- OCP (Over Current Protection): Press the OCP button to activate this feature. If the output current exceeds the set limit, the power supply will cut off output to protect the connected device. The OCP indicator on the display will light up.
- OVP (Over Voltage Protection): This unit includes Over Voltage Protection. If the output voltage exceeds a safe threshold, the unit will automatically shut down to prevent damage.
5.4 Special Functions
- RF Signal Detection: Press the RF button to activate the RF signal detection mode. This feature can be used to detect radio frequency signals, for example, from a mobile phone. The display will show a signal strength indicator.
- Sound Control: Press the SOUND button to toggle the audible feedback for button presses.
- Lock Function: Press the LOCK button to disable most control buttons, preventing accidental changes to settings during operation. The lock indicator will appear on the display. Press again to unlock.
- Constant Voltage/Current Presets: Use the 4.2V 2A Constant or 19V 5A Constant buttons for quick selection of these common fixed output settings. Note that these are fixed values and cannot be adjusted directly when selected.
Video: Demonstration of YIHUA 3005D features, including unboxing, controls, OCP, RF detection, and memory functions.
6. Specifications
| Feature | Specification |
|---|---|
| Output Power | 150W |
| Power Supply Voltage | 220V ±10% 50Hz or 110V ±10% 60Hz |
| Export Voltage | Continuously adjustable from 0 to 30V |
| Voltage Export Accuracy | ±0.02V |
| Recovery Time | 100uS |
| Constant Current Value | 0~5A |
| Constant Output Current | Continuously adjustable from 0 to 5A |
| OCP Current Value | 0-5A Accuracy: ±0.01A |
| Signal Test Frequency Range | 30~1800MHZ (including cell phone signal test) |
| Current Type | DC |
| Phase | Single Phase |
| Certification | CE |
7. Maintenance
- Cleaning: Regularly clean the exterior of the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure ventilation grilles are free from dust and debris.
- Storage: When not in use for extended periods, store the power supply in a cool, dry place, away from direct sunlight and excessive humidity.
- Fuse Replacement: If the unit fails to power on, check the fuse located on the rear panel. Replace it with a fuse of the same type and rating if necessary. Always disconnect the power cable before replacing the fuse.
8. Troubleshooting
- No Power:
- Check if the power cable is securely connected to both the unit and the power outlet.
- Verify that the power outlet is functional.
- Inspect and replace the fuse if blown.
- No Output Voltage/Current:
- Ensure the OUTPUT OFF/ON button is pressed and illuminated green.
- Check if the test leads are correctly connected to the output terminals and the load.
- Verify that the OCP function is not active and tripping due to excessive load current.
- Buttons Unresponsive:
- Check if the LOCK button is active (illuminated). Press it again to unlock the controls.
9. User Tips
No specific user tips were available from reviews or Q&A for this product at this time. However, general best practices for DC power supplies include:
- Always connect your load before enabling the output to prevent sudden current surges.
- Start with lower voltage and current settings and gradually increase them to the desired levels.
- Utilize the OCP feature to protect sensitive circuits from over-current conditions.
- Save frequently used settings to the memory slots for quick access.
10. Warranty and Support
For warranty information, please refer to the Certificate Card included in your package. If you encounter any issues or require technical assistance, please contact the seller or manufacturer directly. Keep your purchase records handy for any warranty claims.
