The UTP3303 is a 207W three-channel linear bench supply for the kind of bench work where the supply itself shouldn't need its own learning curve.

Two adjustable channels deliver 0–32V at 0–3A; a third channel provides a fixed 5V at 3A for logic-level power. Knobs, banana jacks, OVP/OCP via current-limit protection, and the kind of front panel a first-year student gets back to default settings in under 30 seconds.

Linear regulation keeps output ripple under 1mVrms — no switching artifacts, no EMI signature competing with the circuit you're actually trying to characterize. CH1 and CH2 combine in series (up to 64V) or parallel (up to 6A), and a master-slave tracking mode keeps CH1 and CH2 synchronized when matched rails are needed for dual-supply analog work.

• Three Channels, 207W Total — CH1 and CH2: 0–32V / 0–3A adjustable. CH3: fixed 5V / 3A for logic-level power.
• Linear Topology, ≤1 mVrms Ripple — Clean DC output with no switching frequency, no harmonic spurs, and load regulation of CV ≤1×10⁻⁴ + 3 mV.
• Auto CV/CC Crossover with Current Limit Protection — The supply transitions automatically between constant-voltage and constant-current operation when the load steps, protecting both the DUT and the supply.
• Series and Parallel Modes — Combine CH1+CH2 for up to 64V series or 6A parallel — front-panel selectable, no external wiring.
• CH1/CH2 Master-Slave Tracking — Tracking mode synchronizes CH1 and CH2 for matched-rail testing (op-amp ±supplies, balanced analog stages, dual-supply mixed-signal designs).
• 3-Bit Voltage and Current Dual Display — Independent voltage and current readouts per channel. No menus, no hidden settings — what you see is what the channel is doing.
• Output ON/OFF Control — Front-panel master output button keeps you in command of when current actually leaves the supply.
• Knob-and-Button Operation — No firmware to update, no PC software to install, no LAN port to configure. Front-panel only — designed to behave the same way on day one and year five.

Bench Power That Stays Out of the Way

The UTP3303 is the supply you put on a bench when the day's work is upstream of the power supply — circuit prototyping, board-level service, instructional labs where the lesson is signals or amplifiers, not procurement of a programmable instrument. There's no SCPI command set to learn, no firmware path to get wrong before a class starts, and no LAN configuration page to ask IT about. There's a knob, a display, and CV/CC auto-crossover protection that doesn't need a settings menu.

For teaching labs and trade-school programs running 10–30 stations, this is the operational pitch: every student gets the same instrument with the same workflow, every shift. For service shops and small-team R&D benches, it's the supply you reach for when you don't want to think about the supply.

Applications

Teaching Labs & Trade Schools

Per-station cost that lets a 20-bench classroom stay inside budget. Knob-and-button operation matches the curriculum-relevant skill: students learn measurement, not menu navigation.

Analog Bench Development

Dual 0–32V adjustable channels with master-slave tracking power op-amp ±supplies, audio circuits, and balanced analog front-ends from one instrument. Ripple under 1 mVrms keeps supply noise out of the measurement.

Service & Repair

Reliable everyday bench supply for board-level service work. CV/CC auto crossover handles unknown loads safely, and the fixed 5V CH3 covers logic-level powering on legacy boards.

Maker & Hobbyist Workshops

Three-channel linear bench supply at a price that makes sense for a workshop that isn't doing automated production test. Clean output, predictable behavior, no software stack to maintain.

Specifications

Options & Accessories

Included in box:

• Power cord
• English download guide
• multi-language safety manual

FAQ's

Does the UTP3303 have USB or SCPI?

No. The UTP3303 is a fully analog, knob-and-button bench supply — no USB data interface, no LAN, no SCPI command set, no PC software. If your workflow needs SCPI control, the programmable counterparts in the UNI-T linear PSU family are the UDP3303C and UDP3305C (USB + RS-232) and the UDP3000S series (USB + LAN + LXI with web interface).

What's the difference between the UTP3303 and the UTP3305?

Output current. UTP3303 delivers 0–3A on CH1 and CH2 (207W total). UTP3305 delivers 0–5A on CH1 and CH2 (335W total). Voltage range, ripple, regulation, display, and feature set are otherwise identical between the two. Choose UTP3305 if you need to source above 3A on a single rail.

Why a linear supply instead of switching?

Linear topology produces fundamentally cleaner output — no switching frequency, no harmonic spurs, ripple under 1 mVrms. For analog bench work, audio circuits, low-noise sensor development, and any precision measurement where supply noise shows up in the result, the difference is measurable. The trade-off is lower efficiency and more heat, which at this power level on a bench is not a meaningful constraint.

What's included with the UTP3303?

The UTP3303 ships with the instrument, power cord, output cables, English user manual Ships from authorized US dealer.