Overview

The UNI-T UDP4303S is a 4-channel, 297W precision programmable linear DC power supply with fully isolated outputs: two 0–32V/3A channels, one 0–15V/3A channel, and one 0–6V/10A channel. The linear topology delivers exceptionally clean output with ripple under 350 µVrms — critical for sensitive analog circuits, precision sensor development, and any application where switching noise is unacceptable.

With 8 kSa/s output sampling across all four channels, 1 µA current resolution, 1 ms programming time resolution, and a built-in waveform display, the UDP4303S provides real-time visibility into transient load behavior that competing supplies simply cannot match. Series/parallel/tracking modes, a controllable bleeder circuit, and comprehensive OVP/OCP/OTP protection round out a professional-grade instrument backed by a 5-year warranty.

• Four Independent Channels (CH1 & CH2: 32V/3A, CH3: 15V/3A, CH4: 6V/10A)
  Power multi-rail embedded designs from a single instrument — digital core, analog front-end, I/O, and sensor power simultaneously. No external wiring needed for series/parallel combinations.
• 1 µA Resolution Across All Channels
  The low-current measurement mode samples down to 20 mA with 1 µA resolution on all four channels — measure sleep-mode current draw, standby leakage, and IoT sensor consumption directly from the power supply.
• 8 kSa/s Waveform Capture
  See exactly what your load is doing in real time. The built-in waveform display captures voltage, current, and power transients across all channels simultaneously — no external oscilloscope needed for power behavior analysis.

The UDP4303S puts a built-in waveform analyzer on every channel. At 8 kSa/s across all four channels, you can observe voltage, current, and power behavior in real time — capturing inrush currents, transient load steps, and power-up sequences without connecting a separate oscilloscope. The waveform view displays min/max/offset values and supports adjustable time/div and amplitude/div scaling for detailed analysis.

Program up to 512 voltage/current/time groups with 1 ms dwell time resolution — 100× finer than previous-generation supplies. Built-in waveform templates (sine, ramp, triangle, pulse, and more) let you create complex output profiles in seconds. Every channel, including series and parallel modes, supports list output for automated test sequences, battery charge simulation, and device stress testing.

The UDP4303S provides adjustable over-current protection with the fastest response time under 3 ms — fast enough to protect sensitive components from damage. The configurable OCP delay (0–10 seconds) prevents false triggers during power-on inrush. "Setting Change" mode detects overcurrent events only after the programmed delay, while "Anyway" mode monitors continuously. Combined with OVP and OTP, every channel is fully protected.

The 4.3-inch color LCD offers six distinct display layouts — from a four-channel overview showing voltage, current, and power simultaneously, to a single-channel focused view with large digits for across-the-room readability. Choose the view that matches your workflow and switch between them instantly.

Combine CH1 and CH2 through the front-panel menu — no external wiring needed. Series mode delivers up to 64V, parallel mode provides up to 6A, all with the same regulation performance and protection features as independent operation. Channel tracking keeps CH1 and CH2 synchronized automatically when you need matched outputs.

When you turn off a channel output, the controllable bleeder circuit rapidly discharges the output to zero — preventing residual voltage from reaching sensitive DUTs. For battery testing, turn the bleeder off to prevent the supply from draining the battery when the output is disabled. This flexibility makes the UDP4303S equally suited for both powered-circuit development and battery characterization.

All four channels support 4-wire remote sensing through rear-panel terminals, compensating for voltage drop in test leads to ensure the DUT sees exactly the programmed voltage. Unlike competing supplies, the UDP4303S includes sense line protection on all channels — guarding against reverse connection and overvoltage on the sense terminals.

The built-in recorder captures voltage, current, and power data from all channels (including series and parallel modes) to a USB flash drive. Store up to 10 status files, 10 list files, and 10 delayer files locally, plus 5 quick-access presets for your most common configurations. Export everything via USB for analysis on your PC.

All four channels are fully electrically isolated from each other and from the communication interfaces. This means zero crosstalk between channels, freedom to connect outputs in any ground configuration, and safe series/parallel combinations without worrying about ground loops or interference.

The rear panel provides output terminals and remote sense connections for all four channels, plus RS-232, USB Device, LAN, and a 4-line Digital I/O port for trigger input/output. The built-in web server lets you monitor and control the UDP4303S from any browser on your network — no dedicated software required. SCPI command support ensures compatibility with existing automated test frameworks.