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The UNI-T UDP3305S is a high-performance, 4-channel programmable linear DC power supply from UNI-T's Performance-Series. Designed for engineers, researchers, educators, and technicians, this instrument delivers clean, stable, and precise power for a wide range of applications, from circuit debugging and device testing to educational labs and industrial R&D .
Built on a linear regulator architecture, the UDP3305S provides ultra-low output ripple and noise, making it an ideal choice for powering sensitive analog circuits, RF components, and precision electronics where switching power supplies would introduce unacceptable interference . Its 4.3-inch high-definition LCD screen provides a clear and intuitive interface, allowing you to monitor real-time voltage, current, and power for multiple channels simultaneously .
4-Channel Independent Output: Offers flexible powering options with two main channels (0-30V / 0-5A), one auxiliary channel (0-6V / 0-3A), and a fixed 5V/2A USB-style output .
High Total Power: Delivers a maximum total output power of 328W, capable of handling a wide variety of loads from low-power ICs to more demanding circuits .
Ultra-High Resolution: Features a programming resolution of 1mV and 1mA, allowing for exceptionally fine control of output parameters .
One-Key Series/Parallel Mode: Simplify high-voltage or high-current applications by internally connecting the two main channels (CH1 and CH2) in series or parallel without any external wiring .
List and Delayer Functions: Create complex test sequences by programming up to 2048 sets of voltage and current steps, with up to 99,999 cycles—ideal for automated testing, cycling, and aging tests .
Rich Connectivity & Remote Control: Includes RS232, LAN (Ethernet), USB Host/Device, and Digital I/O interfaces for seamless integration into automated test systems and remote control via PC software .
Comprehensive Protections: Safeguards your device under test and the power supply itself with Over Voltage Protection (OVP), Over Current Protection (OCP), and Over Temperature Protection (OTP) .
Waveform Display Function: Visually track output voltage, current, and power in real-time with the built-in waveform display, making it easier to observe trends and stability .
Intelligent Fan Control: Minimizes distracting noise by dynamically adjusting the cooling fan speed based on operating temperature and load .
The UDP3305S's four channels provide exceptional versatility for powering a wide range of devices:
CH1 & CH2: The primary variable outputs (0-30V/5A) for powering your main circuits .
CH3: A lower-voltage, variable output (0-6V/3A) ideal for powering logic circuits or low-voltage sections of a design .
CH4: A fixed 5V/2A output, often used to power USB devices or as a dedicated supply for microcontroller boards .
Simplify high-power applications by internally connecting CH1 and CH2:
Series Mode: Doubles the output voltage to 60V while maintaining a 5A current limit .
Parallel Mode: Doubles the output current to 10A while maintaining a 30V voltage limit .
Create complex test sequences with the built-in list and delayer functions :
Configure up to 2048 sets of voltage/current steps and timing intervals.
Run the sequence for up to 99,999 cycles.
Use pre-defined waveform templates (sine, pulse, ramp, stair, exponential) for quick setup .
Go beyond just numbers. The UDP3305S can display the output voltage, current, and power waveforms of up to three channels simultaneously on its 4.3-inch screen, allowing you to visualize trends and stability in real-time .
Integrate the UDP3305S into your automated test system via its host of interfaces:
LAN & RS232: Ideal for connecting to a PC for remote control and monitoring .
USB Device: Enables direct control via the included USB cable and PC software.
Digital I/O: Provides external trigger input for synchronizing with other instruments in a test setup .
SCPI Support: The instrument supports Standard Commands for Programmable Instruments (SCPI), allowing for flexible programming .
The UDP3305S automatically switches between CV and CC mode based on the load, providing a stable supply in all conditions. An indicator on the front panel clearly shows the active mode .
Protect your valuable circuits from damage. The UDP3305S features OVP (Over Voltage Protection), OCP (Over Current Protection), and OTP (Over Temperature Protection). These protections will immediately cut off the output when a set threshold is exceeded, ensuring safety .
Save time by storing frequently used output configurations. The UDP3305S supports 10 groups of internal presets, and also allows for reading and writing settings to an external USB flash drive .
Visually track output voltage, current, and power in real-time with the built-in waveform display, making it easier to observe trends and stability .
The UNI-T UDP3305S is an ideal all-in-one tool for:
Powering and characterizing prototypes
Testing power management ICs (PMICs) and battery charging circuits
Characterizing device performance under various load conditions
Providing clean, adjustable power for student electronics projects
Teaching power supply design and measurement techniques
Safe and versatile power source for a wide range of experiments
Automated testing of electronic sub-assemblies
Burn-in and reliability testing using the List/Delayer function
Powering devices during calibration and quality assurance
Diagnosing faulty circuits by providing precise power to specific sections
Testing and troubleshooting power supplies, amplifiers, and motherboards
A versatile and reliable tool for any electronics repair bench
While the UDP3305S is the standard model, UNI-T also offers a variant, the UDP3305S-E. The key difference lies in the specifications of the main outputs (CH1/CH2) :
| Model | CH1 / CH2 Output Range | Total Power |
|---|---|---|
| UDP3305S | 0-32V / 0-5A (max) | 348W |
| UDP3305S-E | 0-30V / 0-5A (max) | 328W |
The standard UDP3305S offers a slightly higher maximum voltage (32V vs. 30V) and total power. Ensure you select the model that best fits your voltage requirements .
Proper Grounding: To avoid electric shock, always use the supplied power cord and ensure the instrument is properly grounded before use .
Operating Environment: Use in a clean, dry environment with temperatures between 0°C and 40°C. Avoid dusty and high-humidity areas .
Ventilation: Ensure adequate airflow around the instrument to prevent overheating.
Cleaning: Clean the exterior with a soft, dry cloth. Avoid solvents or abrasive materials.
Output Connections: When connecting the load, always turn the output off first to prevent accidental short circuits.
Fuse Replacement: For safety, always replace the fuse with one of the specified type and rating if it fails.
Service: Only qualified service personnel should perform internal adjustments or repairs.
The UNI-T UDP3305S is highly regarded for its exceptional performance and versatility in the professional electronics community. Its combination of 4-channel outputs, high resolution, linear regulation, and advanced programming features makes it a standout choice in its price range.
Four Channels in One: The ability to power an entire circuit board with positive, negative, and logic voltages from a single unit is a huge space-saver and efficiency booster.
Clean Output: Users praise the ultra-low noise linear supply, noting it's ideal for sensitive audio and RF projects where switching supplies cause problems.
Build Quality: The unit feels solid and well-built, with a sturdy chassis that instills confidence for long-term bench use.
Ease of Use: The 4.3-inch LCD and intuitive interface make it easy to set and monitor all four channels simultaneously.
Value: The UDP3305S offers features and performance comparable to more expensive competing brands at a significantly lower cost.
Weight: At approximately 19 lbs (8.6 kg), it is a heavy bench instrument, but this weight is indicative of its robust linear transformer design .
Learning Curve: While the interface is intuitive, the advanced list/delayer functions may require a brief period to master.
Fan Noise: The intelligent fan is generally quiet, but it will ramp up under heavy loads, which is expected for a linear power supply of this class
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