The UDP3303C is the SCPI-programmable counterpart to the UDP3303A.
It features the same 195W three-channel linear hardware, same CH3 logic-rail selector cycling 1.8V / 2.5V / 3.3V / 5V at 3.2A, same ≤1 mVrms ripple — with a back-panel USB-Device port and RS-232 added for full SCPI control. CH1 and CH2 deliver 0–30V at 0–3A; series and parallel modes extend that to 60V or 6A.
Programming accuracy holds inside ≤0.1% + 30 mV on voltage and ≤0.5% + 2 mA on current — fine enough for sleep-mode current characterization on IoT prototypes, battery-charge cut-off testing, and any automated sweep that needs the setpoint to land exactly where you asked it. Five preset storage groups (M1–M5), shutdown memory, OVP / OCP / OTP per channel, and a Digital I/O hardware ON/OFF pin pair round out a programmable supply built for benches that have to behave the same way every time. For 5A per adjustable channel, see the UDP3305C; for the knob-only manual variant, see the UDP3303A.
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Three Channels, 195W Total — SCPI Programmable — CH1 and CH2: 0–30V / 0–3A adjustable. CH3: switchable 1.8V / 2.5V / 3.3V / 5V at 3.2A. SCPI control over USB-Device or RS-232.
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USB-Device + RS-232 with SCPI — Back-panel data interfaces for PC connection. Standard accessories include both a USB cable (UT-D14) and RS-232 communication line — pick the bus your test rig already uses.
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Programming Accuracy ≤0.1% + 30 mV — Voltage programming accuracy ≤0.1% + 30 mV; current programming accuracy ≤0.5% + 2 mA. Set value matches output value across the full range.
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CH3 Logic-Rail Selector — Single front-panel button cycles CH3 through 1.8V / 2.5V / 3.3V / 5V at 3.2A. CMOS, microcontroller cores, legacy TTL, USB-class — covered without sacrificing CH1/CH2.
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Linear Topology, ≤1 mVrms Ripple — Clean DC output for low-noise analog work. Load regulation ≤0.01% + 3 mV in CV mode.
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10 mV / 1 mA Resolution — Four-digit voltage and current display per channel on EBTN LCD.
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Series, Parallel, and Tracking Modes — Combine CH1+CH2 for up to 60V series or 6A parallel from the front panel. SCPI exposes the same modes for automated test integration.
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OVP / OCP / OTP Protection — Configurable per-channel thresholds, plus over-temperature shutdown and keypad lock.
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Five Preset Storage Groups — M1–M5 store full instrument states for fast bench setup. Shutdown memory restores last settings on power-up.
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Front-Panel 5V/2A USB Charging Port (CH4) — Independent 5V/2A USB-A charging output. Charging output only — the data interfaces are USB-Device and RS-232 on the back panel.
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Hardware Output Disable via Digital I/O — Two-pin Digital I/O terminal for emergency cutoff and external interlock circuits.
Detailed Features
CH3 Logic-Rail Selector — One Button, Four Voltages
Most three-channel bench supplies give you two adjustable channels and a fixed 5V rail you'll resent the moment you need 3.3V. The UDP3303C's CH3 cycles between 1.8V, 2.5V, 3.3V, and 5V at 3.2A — covering CMOS logic, modern microcontroller cores, legacy TTL, and USB-class devices — at a single front-panel button press. CH1 and CH2 stay free for the analog work the linear topology is genuinely good at — op-amp rails, sensor bias, charge-pump references, audio circuits — while CH3 handles whatever digital subsystem the project also needs powered. One supply, two adjustable analog rails, one switchable digital rail, all labeled, all protected, all SCPI-controllable.
SCPI Programmable for Repeatable Bench Work
The UDP3303C is the programmable counterpart to the UDP3303A — same hardware, same protection, same CH3 logic-rail selector — with a back-panel USB-Device port and RS-232 added for SCPI control. Script the rails over USB or RS-232, capture readbacks, document the run, and repeat it tomorrow morning the same way. Programming accuracy holds inside ≤0.1% + 30 mV on voltage and ≤0.5% + 2 mA on current — fine enough for IoT sleep-mode current characterization, battery-charge cut-off testing, and any sweep that needs the setpoint to land where you asked it to. Five preset storage groups (M1–M5) and a Digital I/O hardware ON/OFF pin pair round out a programmable supply built for benches that have to behave the same way every time.
Applications
R&D Bench & Prototyping
Three rails (two adjustable, one switchable digital) with SCPI control script the bench setup directly from your test framework. Linear topology and ≤1 mVrms ripple keep supply noise out of measurement on op-amp characterization, ADC reference rails, and sensor-bridge excitation work.
Automated Test Lab Integration
SCPI over USB-Device or RS-232 integrates with LabVIEW, Python-VISA, and shell-driven test frameworks. Five preset storage groups keep frequently used test setups one command away. Programming accuracy ≤0.1% + 30 mV keeps automated sweeps repeatable across runs.
Teaching Labs & Automated Lab Exercises
For curricula that introduce instrument automation alongside instrument operation, the UDP3303C lets a class go from manual front-panel work to scripted SCPI control without changing the instrument.
Mixed-Signal Development
CH1 and CH2 power analog rails at low ripple; CH3 cycles through digital-side voltages without retuning. SCPI lets the test script raise or lower the digital rail while CH1/CH2 hold the analog supplies steady — useful for power-sequencing and sleep-mode characterization on mixed-signal prototypes.
