1. Introducció
This manual provides detailed instructions for the safe and efficient operation of your Jesverty SPS-12003M DC Stabilized Power Supply. This device is designed for various applications requiring a stable and adjustable DC power source, including research, manufacturing testing, maintenance, battery charging, electrolysis, and DIY electronics projects. Please read this manual thoroughly before use and keep it for future reference.
2. Instruccions de seguretat
- Ensure the power supply is connected to an AC 100V, 50/60Hz power source, as this product is specifically designed for Japanese AC 100V input.
- No utilitzeu el dispositiu en mullat o damp condicions.
- No obriu la c.asing of the power supply. Refer all servicing to qualified personnel.
- Ensure proper ventilation around the unit to prevent overheating. The built-in temperature-controlled cooling fan requires clear airflow.
- Always connect the load before turning on the output.
- Verifiqueu el voltage and current settings before applying power to your circuit or device.
- Utilize the Over Current Protection (OCP) feature to safeguard your connected devices.
3. Producte acabatview
The Jesverty SPS-12003M features an intuitive interface with a 4-digit LED display and encoder knobs for precise control. It also includes convenient USB-A and USB-C fast charging ports.

Figura 3.1: Components del panell frontal i posterior
Components del panell frontal:
- Voltage Visualització: Mostra el volum de sortidatage.
- Vol. Constanttage (CV) Mode Indicator: Lights up when the power supply is operating in constant voltagmode e.
- Visualització actual: Mostra el corrent de sortida.
- Constant Current (CC) Mode Indicator: Lights up when the power supply is operating in constant current mode.
- Pantalla de potència: Shows the output power in Watts.
- Output Status LED: Indicates if the output is active.
- Més del voltage Protection (OVP) Status LED: Lights up when OVP is triggered.
- Over Current Protection (OCP) Status LED: Lights up when OCP is triggered.
- OPN Indicator: Indicates if the OPN (Output ON immediately after power switch) function is active.
- Voltage Botó d'ajust: Botó codificador per ajustar el volum de sortidatage.
- Botó d'ajust de corrent: Botó codificador per ajustar el corrent de sortida.
- USB-A Fast Charging Port: Provides 20W fast charging.
- USB-C Fast Charging Port: Provides 20W fast charging.
- Interruptor d'alimentació: Encén/apaga la unitat.
- Botó de configuració de l'OCP: Used to set the Over Current Protection limit.
- Botó de control de sortida: Toggles the main DC output on or off.
- Output Terminal (+): Terminal vermell per a sortida positiva.
- Terminal de terra (GND): Green terminal for ground connection.
- Output Terminal (-): Terminal negre per a sortida negativa.
Components del panell posterior:
- Ventilador de refrigeració: Temperature-controlled fan for heat dissipation.
- Entrada Voltage Interruptor selector: (Note: This product is designed for AC100V. Do not change this setting unless instructed by support.)
- Entrada d'alimentació CA: Per connectar el cable d'alimentació.
- Caixa de fusibles: Contains a replaceable fuse (spare fuse included).
4. Configuració
- Desembalatge: Carefully remove the power supply and all accessories from the packaging. Verify that all items listed in the "Package Contents" section are present.
- Col·locació: Col·loqueu la unitat sobre una superfície estable i plana amb una ventilació adequada. Assegureu-vos que el ventilador de refrigeració de la part posterior no estigui obstruït.
- Connexió d'alimentació: Connect the provided power cord to the AC Power Inlet (22) on the rear panel and then to a standard AC 100V, 50/60Hz wall outlet.
- Connexió de càrrega: Connect your load to the output terminals (17, 18, 19) using the provided load cables. Ensure correct polarity (red for positive, black for negative, green for ground).
5. Instruccions de funcionament
5.1 Engegada/apagada
- To power on the unit, press the Power Switch (14). The LED display will illuminate.
- To power off, press the Power Switch (14) again.
5.2 voltage i Ajust de corrent
The SPS-12003M features high-precision encoder knobs for setting voltage and current with a resolution of 0.01V and 0.001A respectively.

Figura 5.1: Voltage and Current Adjustment Method
- Select Digit: Premeu el botó Voltage Adjustment Knob (10) or Current Adjustment Knob (11) to select the digit you wish to adjust. The selected digit will blink.
- Ajusta el valor: Rotate the knob clockwise to increase the value or counter-clockwise to decrease it. You can adjust each digit from 0 to 9.
- Repeat steps 1 and 2 until the desired voltage and current limits are set.
5.3 Control de sortida ON/OFF
The dedicated Output Control Button (16) allows you to enable or disable the main DC output without turning off the entire unit or disconnecting the load.
- Després d'ajustar el volum desitjattage and current, press the Output Control Button (16) to enable the output. The Output Status LED (6) will light up.
- Press the button again to disable the output. The Output Status LED (6) will turn off.
5.4 USB Fast Charging
The unit includes 20W USB Type-A (12) and Type-C (13) fast charging ports for convenience.

Figure 5.2: USB Fast Charging Capability
- Connect your smartphone, Arduino UNO, Raspberry Pi, or other electronic modules to the USB-A or USB-C ports for fast charging or power input.
- These ports provide up to 20W of power.
5.5 Característiques de protecció
The power supply incorporates several protection mechanisms to ensure safety and device longevity.

Figura 5.3: Sistema de protecció i refrigeració intern
- Protecció contra sobrecorrent (OCP): This feature can be set by the user. Press the OCP Setting Button (15) to adjust the maximum current limit. If the output current exceeds this limit, the OCP will trigger, and the OCP Status LED (8) will light up, protecting your load.
- Més del voltage Protecció (OVP): This is a fixed protection feature. If the output voltage exceeds a safe limit, OVP will trigger, and the OVP Status LED (7) will light up.
- Temperature-Controlled Cooling Fan: The built-in fan (20) automatically adjusts its speed based on the internal temperature to maintain optimal operating conditions and extend product life.
- Funció OPN: If the OPN (Output ON immediately after power switch) function is enabled, the power supply will output voltage and current immediately after the main power switch (14) is turned on, without needing to press the Output Control Button (16). The OPN Indicator (9) will be lit.
5.6 Ajust de la brillantor de la pantalla
You can adjust the brightness of the LED display for comfortable viewen diferents condicions d'il·luminació.

Figure 5.4: Adjusting Display Brightness
- To increase brightness, simultaneously rotate both the Voltage Adjustment Knob (10) and Current Adjustment Knob (11) clockwise.
- To decrease brightness, simultaneously rotate both knobs counter-clockwise.
6. Manteniment
- Neteja: Regularly wipe the exterior of the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Ventilació: Ensure the cooling fan and ventilation openings remain free of dust and debris. Periodically clean them with compressed air if necessary.
- Substitució de fusibles: If the unit fails to power on, check the fuse in the fuse box (23) on the rear panel. Replace it with a fuse of the same type and rating if blown. A spare fuse is included.
- Emmagatzematge: Quan no la feu servir durant períodes prolongats, guardeu la font d'alimentació en un lloc fresc i sec, allunyat de la llum solar directa i de temperatures extremes.
7. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| La unitat no s'encén. | No power from outlet, power cord loose, blown fuse. | Check wall outlet, ensure power cord is securely connected, replace fuse if necessary. |
| Sense sortida voltage / actual. | Output is off, OCP/OVP triggered, load not connected correctly. | Press Output Control Button (16) to enable output. Check OCP/OVP status LEDs. Verify load connections and polarity. |
| OCP/OVP LED is lit. | Over current or over voltage condició detectada. | Reduce load current or voltage. Check for short circuits in the load. Reset the output. |
| Fan is noisy or unit overheats. | Obstructed ventilation, excessive load. | Ensure clear airflow around the fan. Reduce the load if operating continuously at high power. |
| USB charging ports not working. | Device not compatible, cable issue. | Ensure your device supports 20W fast charging. Try a different USB cable. |
8. Especificacions
| Característica | Especificació |
|---|---|
| Model | SPS-12003M |
| Marca | Jesverty |
| Entrada Voltage | AC 100V, 50/60Hz (Japan specific) |
| Vol. De sortidatage | 0-120V CC (ajustable) |
| Corrent de sortida | 0-3A (Ajustable) |
| Potència màxima | 360W |
| Voltage Resolució de la pantalla | 0.01 V |
| Resolució de pantalla actual | 0.001A |
| Sortida USB-A | Càrrega ràpida de 20 W |
| Sortida USB-C | Càrrega ràpida de 20 W |
| Característiques de protecció | OCP (Adjustable), OVP (Fixed), Over Temperature Protection, Short Circuit Protection |
| Refrigeració | Ventilador amb control de temperatura |
| Dimensions (L x A x A) | Aprox. 180 x 85 x 155 mm (7.1 x 3.35 x 6.1 polzades) |
| Pes | Aprox. 1.1 kg |
| Certificacions | FCC, RoHS |
| Material | Plàstic |
| Factor de forma | Sobre de banc |
9. Contingut del paquet
- Jesverty SPS-M Unit x 1
- Power Cord (Japanese 2-Pin + Ground Clip) x 1
- Load Cables (Test Leads) x 1 set
- Manual d'instruccions x 1
10. Garantia i Suport
Jesverty products come with a 1-year product warranty from the date of purchase. Additionally, for non-human-caused failures occurring within one month of purchase, returns or new product exchanges are possible.
If you encounter any issues or have questions regarding the use of your product, please contact Jesverty customer service via Amazon message or email. Our customer service is available in Japanese.