1. Introduction
This manual provides detailed instructions for the safe and efficient operation of your Jesverty SPS-12003 DC Power Supply. This adjustable switching DC regulated bench power supply offers a variable output from 0-120V and 0-3A, making it suitable for a wide range of applications including electronic testing, laboratory use, product development, and DIY projects. It features a high-precision 4-digit LED display for real-time voltage, current, and power readings, along with a convenient 5V/2A USB port.
Figure 1: Front view of the Jesverty SPS-12003 DC Power Supply.
2. Safety Instructions
Please read and understand all safety warnings and operating instructions before using this device. Failure to do so may result in electric shock, fire, or serious injury.
- Grounding: Always ensure the power supply is properly grounded using a three-prong power cord. Do not defeat the grounding plug.
- Ventilation: Ensure adequate ventilation around the unit. Do not block ventilation openings. The internal fan requires clear airflow to prevent overheating.
- Environment: Use the power supply in a dry, well-ventilated area, away from direct sunlight, heat sources, and moisture. Avoid operating in environments with flammable gases or vapors.
- Output Connections: Connect output leads only after the power supply is turned off and the desired voltage/current limits are set. Ensure correct polarity.
- Load Compatibility: Do not exceed the maximum voltage or current ratings of the power supply or the connected load.
- Test Leads: The included test leads are for basic use. For long-term use of high current, prepare test leads with sufficient current capacity.
- Internal Components: Do not open the casing of the power supply. There are no user-serviceable parts inside. Refer all servicing to qualified personnel.
- Emergency Shutdown: In case of abnormal operation, smoke, or unusual odors, immediately disconnect the power supply from the main power outlet.
3. Product Overview
Familiarize yourself with the various components and controls of your Jesverty SPS-12003 power supply.
Figure 2: Component Names and Layout.
- Voltage Display: Shows the output voltage in Volts (V).
- Current Display: Shows the output current in Amperes (A).
- Power Display: Shows the output power in Watts (W).
- C.V. Mode Indicator: Illuminates when the unit is operating in Constant Voltage mode.
- C.C. Mode Indicator: Illuminates when the unit is operating in Constant Current mode.
- Voltage Knob (Coarse): For large adjustments of the output voltage.
- Current Knob (Coarse): For large adjustments of the output current.
- Voltage Knob (Fine): For precise, small adjustments of the output voltage.
- Current Knob (Fine): For precise, small adjustments of the output current.
- USB Charging Port (5V/2A): Provides a stable 5V, 2A output for charging compatible USB devices.
- Output Terminal + (Red): Positive output terminal.
- Grounding Terminal (Green): Ground connection terminal.
- Output Terminal - (Black): Negative output terminal.
- Power Switch: Turns the unit ON/OFF.
- Cooling Fan: Automatically activates to dissipate heat during operation.
- AC Power Inlet: Connects to the main AC power source.
- Fuse Box: Contains the main fuse (spare fuse inside).
4. Setup
- Unpacking: Carefully remove the power supply and all accessories from the packaging. Inspect for any signs of damage.
- Placement: Place the unit on a stable, level surface with sufficient space for ventilation, especially around the rear cooling fan.
- Power Connection: Ensure the power switch is in the OFF position. Connect the provided power cord to the AC Power Inlet (16) on the rear of the unit, then plug the other end into a grounded AC power outlet.
- Initial Check: Before connecting any load, turn the power switch (14) to the ON position. The LED display should illuminate, showing default voltage and current readings.
5. Operating Instructions
5.1. Setting Voltage and Current
The Jesverty SPS-12003 allows for precise adjustment of both voltage and current limits.
- Adjusting Voltage: Use the V-COARSE (6) knob for large voltage changes and the V-FINE (8) knob for precise adjustments. Turn clockwise to increase, counter-clockwise to decrease.
- Adjusting Current: Use the A-COARSE (7) knob for large current changes and the A-FINE (9) knob for precise adjustments. Turn clockwise to increase, counter-clockwise to decrease.
- Setting Limits Before Connecting Load: It is recommended to set the desired voltage and current limits before connecting your device. Turn the current knob fully clockwise to set the maximum current limit. Adjust the voltage to your desired level. Then, connect your load. If you need to limit the current, slowly turn the current knob counter-clockwise until the desired current limit is reached. The C.C. indicator will light up when the current limit is active.
Figure 3: Voltage and Current Setting Method.
5.2. Constant Voltage (C.V.) and Constant Current (C.C.) Modes
The power supply automatically switches between C.V. and C.C. modes depending on the load conditions.
- Constant Voltage (C.V.) Mode: When the load resistance is high, the output voltage remains constant at the set value, and the output current varies according to the load. The C.V. indicator (4) will be lit.
- Constant Current (C.C.) Mode: When the load resistance is low, the output current remains constant at the set value, and the output voltage varies according to the load. The C.C. indicator (5) will be lit. This mode protects the connected device from excessive current.
Figure 4: Automatic C.V. and C.C. Mode Switching.
5.3. USB Charging Function
The 5V/2A USB port (10) can be used to charge various USB-powered devices.
Figure 5: USB Charging Function.
5.4. Power Calculation Display
The power supply automatically calculates and displays the output power (W) based on the measured voltage and current. This feature provides real-time power consumption information for your connected devices.
Figure 6: Automatic Power Calculation Display.
5.5. Applications
The Jesverty SPS-12003 is versatile and can be used in various settings:
- Laboratories and Schools: Ideal for educational and research purposes.
- Electronic Repair: Suitable for repairing circuit boards, chips, and other electronic components.
- DIY Projects: Powers various home and hobbyist electronic creations.
- Battery Charging: Can be used for charging certain types of batteries (ensure compatibility and proper charging protocols).
Figure 7: Diverse Applications of the Power Supply.
6. Maintenance
Proper maintenance ensures the longevity and reliable operation of your power supply.
- Cleaning: Regularly wipe the exterior of the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Ventilation: Keep the cooling fan (15) and ventilation openings clear of dust and debris. A temperature-regulated fan ensures efficient cooling.
- Fuse Replacement: If the unit does not power on, check the fuse located in the Fuse Box (17) at the rear. Replace with a fuse of the same type and rating if blown. A spare fuse is typically located inside the fuse box holder.
Large Cooling Fan
Spare Fuse Location
7. Troubleshooting
If you encounter issues with your power supply, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power/Display off | Power cord not connected; Power switch off; Blown fuse; Internal fault. | Check power cord connection; Turn power switch ON; Replace fuse (see Maintenance); Contact customer service. |
| No output voltage/current | Output terminals not connected; Voltage/current set to zero; Overload protection active; Short circuit. | Connect leads correctly; Adjust voltage/current knobs; Reduce load; Check for short circuit in load. |
| Unit overheats | Blocked ventilation; Excessive load. | Ensure clear airflow around fan; Reduce load or operating time. |
| Inaccurate readings | Faulty test leads; Calibration needed. | Try different test leads; Contact customer service for calibration. |
7.1. Reliability Test Video
Video 1: Jesverty Reliability Test. This video demonstrates the power supply's performance under various conditions, highlighting its stability and low ripple noise, which are crucial for protecting sensitive electronic components.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | SPS (Red LED) 120V 3A |
| Output Voltage | 0-120V DC |
| Output Current | 0-3A |
| Display | 4-Digit LED (V, A, W) |
| USB Port | 5V/2A |
| Product Dimensions | 7.09 x 3.35 x 6.1 inches |
| Item Weight | 2.5 pounds |
| Material | Aluminum, Plastic |
| Manufacturer | Jesverty |
| Country of Origin | China |
9. Warranty and Customer Support
Jesverty is committed to providing high-quality products and professional technical support. Your SPS-12003 unit comes with an instruction manual that includes contact information for customer service.
Should you have any problems or questions about your order or the product's operation, please feel free to contact Jesverty Customer Service via Amazon or email. We are dedicated to assisting you with any technical inquiries or support needs.
9.1. Product Overview Video
Video 2: Jesverty DC Power Supply. This video provides a comprehensive overview of the power supply's features, design, and benefits, offering a visual guide to its capabilities.
