1. Úvod a konecview
The LONGWEI K3010D is a professional-grade variable DC power supply designed for precision applications in laboratories, schools, home electronics repair, DIY projects, and aging tests. It features a high-resolution 4-digit LED display for accurate voltage and current readings, visible even in low-light conditions. This power supply offers adjustable output from 0-30V and 0-10A, making it versatile for various electrical and electronic tasks.

Obrázek 1.1: Přední strana view of the LONGWEI K3010D DC Power Supply with test leads.

Figure 1.2: The power supply integrated into a laboratory setup, demonstrating its application in electronic testing.
2. Bezpečnostní pokyny
Safety is paramount when operating any electrical equipment. This power supply incorporates essential safety features including limited flow protection, overpower protection, over-temperature protection, and voltage overload protection. Always adhere to the following guidelines:
- Ensure the grounding wire is properly connected before operation.
- Nepřekračujte maximální jmenovitý objemtage (30V) or current (10A) of the device.
- Avoid blocking the ventilation openings to ensure proper heat dissipation.
- Operate the device in a dry, well-ventilated area, away from flammable materials.
- In case of abnormal operation, immediately disconnect power and consult the troubleshooting section or contact support.

Figure 2.1: Internal components of the power supply, highlighting robust design for protection.
3. Vlastnosti produktu
The K3010D power supply is engineered with several key features to enhance performance and user experience:
- High Precision 4-Digit LED Display: Provides accurate readings of voltage (0.01V resolution) and current (0.01A resolution), ensuring precise control over your experiments and repairs.
- Nastavitelný výstup: Easily tune voltage from 0-30V and current from 0-10A.
- Vynikající odvod tepla: Equipped with an intelligent temperature-controlled fan and multiple heat radiation grooves. The fan activates automatically when the internal temperature reaches a certain threshold, reducing noise and prolonging product lifespan.
- Kompaktní design: Weighing less than 2kg and measuring approximately 2.7 x 8.6 x 6.3 inches, it is highly portable and space-efficient for various work environments.

Figure 3.1: Front panel features including the digital display, voltage and current adjustment knobs, and output terminals.
4. Obsah balení
Po vybalení se prosím ujistěte, že jsou v balení všechny následující položky:
- 1 x LONGWEI K3010D DC Power Supply
- 1 x Output Power Cord (with alligator clips)
- 1 x Input Power Cord
- 1 x testovací sondy
- 1 x Uživatelská příručka

Obrázek 4.1: Všechny položky obsažené v balení produktu.
5. Nastavení
Pro nastavení stejnosměrného napájení postupujte takto:
- Umístění: Place the power supply on a stable, flat surface with adequate ventilation around the unit. Ensure the rear fan is not obstructed.
- Připojení napájení: Connect the provided input power cord to the power input socket on the rear of the unit and then to a suitable AC power outlet.
- Základy: Connect the grounding terminal (GND, typically yellow) on the front panel to a reliable ground source using the appropriate cable.
- Výstupní připojení: Connect the red output power cord to the positive (+) terminal and the black output power cord to the negative (-) terminal. Attach the alligator clips or test probes to the other end of these cords, ready for connection to your load.

Figure 5.1: Labeled components on the front and rear panels for proper connection.
6. Návod k obsluze
Operating the LONGWEI K3010D is straightforward:
- Zapnutí: Press the 'On/Off' button on the front panel to power on the unit. The LED display will illuminate.
- Upravit svtage: Použijte tlačítko „Svazek“tage' knob to set the desired output voltage. The 4-digit display will show the precise voltage.
- Nastavení proudu: Use the 'Current' knob to set the desired current limit. This acts as a safety feature, preventing excessive current draw by the connected device.
- Připojení zátěže: Jednou svtage and current are set, connect your device or circuit to the output terminals using the test leads.
- Výstup monitoru: Displej zobrazí objem v reálném časetage and current being supplied to your load. The 'C.V' (Constant Voltage) and 'C.C' (Constant Current) indicators will show the operating mode.
Video 6.1: Demonstration of setting voltage and current, and connecting an LED strip as a load.
Poznámka: When setting the current limit, it is often recommended to short the output leads (briefly and safely) and adjust the current knob to the desired maximum current. Then, remove the short and connect your load. The unit will then limit the current to this preset value if the load attempts to draw more.

Obrázek 6.1: Přamples of common applications for the power supply.
7. Údržba
To ensure the longevity and optimal performance of your LONGWEI K3010D DC Power Supply, follow these maintenance guidelines:
- Čištění: Regularly wipe the exterior of the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure no liquids enter the device.
- Větrání: Periodically check that the cooling fan and ventilation openings are free from dust and debris. Use compressed air to clear any blockages if necessary.
- Skladování: Pokud se napájecí zdroj delší dobu nepoužívá, skladujte jej na chladném a suchém místě, mimo dosah přímého slunečního záření a extrémních teplot.
- Kontrola kabelů: Inspect power cords and test leads regularly for any signs of damage, fraying, or exposed wires. Replace damaged cables immediately.
8. Řešení problémů
Pokud narazíte na problémy se zdrojem napájení, postupujte podle následujících běžných kroků pro řešení problémů:
| Problém | Možná příčina | Řešení |
|---|---|---|
| Není napájení/Vypnutý displej | Power cord disconnected, power switch off, blown fuse. | Check power cord connection. Ensure 'On/Off' switch is pressed. Check and replace fuse if necessary (refer to specifications for fuse type). |
| Žádný výstupní objemtage/aktuální | Výstupní svorky nejsou připojeny, objemtagKnoflíky elektrického proudu nastaveny na nulu, ochrana aktivována. | Ensure test leads are securely connected. Adjust voltage/current knobs to desired values. Check for OVP/OCP indicators on display; disconnect load and reset if protection is active. |
| Ventilátor neběží | Normal operation (temperature below threshold), fan malfunction. | The fan is temperature-controlled and only runs when needed. If the unit is hot and the fan is not running, contact support. |
| Nepřesné údaje | Loose connections, faulty test leads, external interference. | Check all connections. Try different test leads. Ensure the unit is not near strong electromagnetic fields. |
If the problem persists after attempting these solutions, please contact LONGWEI customer support.
9. Specifikace
Detailed technical specifications for the LONGWEI K3010D DC Power Supply:
- Číslo modelu: K3010D
- Značka: LONGWEI
- Vstupní objemtage: 2.4E+2 Volts (AC) (Typically 110V/220V switchable, check rear panel)
- Výstupní objemtage: 0-30V DC (Adjustable)
- Výstupní proud: 0-10A (nastavitelný)
- Zobrazit: 4místný LED displej (hlasitosttage, Current)
- svtage Resolution: 0.01V
- Current Resolution: 0.01A
- Rozměry produktu: 8.66 x 2.76 x 6.3 palce
- Hmotnost: 3.95 libry (přibližně 1.8 kg)
- Výrobce: LongWei Ltd.
- První dostupné datum: 1. ledna 2019
- Typ konektoru: Barrel Connector (for output leads)
- Bezpečnostní ochrany: Limited Flow Protection, Overpower Protection, Over Temperature Protection, Voltage Ochrana proti přetížení

Figure 9.1: Product dimensions and cable specifications.
10. Záruka a podpora
LONGWEI is committed to providing high-quality products and excellent customer service. Your K3010D DC Power Supply comes with:
- 12-Month After-Sale Service: Komplexní podpora po dobu jednoho roku od data zakoupení.
- Doživotní technická podpora: Assistance with any technical queries or operational issues throughout the product's lifespan.
- 30 Days Free of Return: Risk-free return policy within 30 days of purchase.
For any concerns or technical assistance, please feel free to contact LONGWEI Instruments Co.,LTD. We aim to reply and resolve your problem within 24 hours.




