{"title":"Bench Power Supplies","description":"\u003cp\u003ePower electronics projects, repair benches and lab experiments with adjustable DC bench supplies. Compare channel count, output voltage, current per channel and total power before choosing.\u003c\/p\u003e\u003ch2\u003eManual or programmable?\u003c\/h2\u003e\u003cp\u003eManual linear supplies suit direct front-panel control. Programmable models add remote-control interfaces where specified. Check whether channels operate independently or support series and parallel modes; combined output limits vary by model.\u003c\/p\u003e\u003cp\u003eBrowse \u003ca href=\"\/collections\/test-measurement\"\u003etest and measurement equipment\u003c\/a\u003e and \u003ca href=\"\/collections\/uni-t\"\u003eUNI-T instruments\u003c\/a\u003e. Stock and lead-time information appear on each product page.\u003c\/p\u003e","products":[{"product_id":"udp3303c-3ch-195w-30v-3a-programmable-linear-dc-power-supply","title":"UNI-T UDP3303C Programmable DC Power Supply — 3 Channels, 195W","description":"\u003cp\u003e\u003cstrong\u003eAvailability notice:\u003c\/strong\u003e This model is currently out of stock with our distributor. Restock timing is unconfirmed. Please contact us to confirm availability before ordering.\u003c\/p\u003e\u003cp\u003eThe UNI-T UDP3303C is a three-channel linear bench power supply for electronics development and automated testing. Two adjustable channels deliver up to 30V and 3A each; USB-Device and RS-232 provide SCPI control.\u003c\/p\u003e\u003cp\u003eBrowse \u003ca href=\"\/collections\/uni-t\"\u003eUNI-T instruments\u003c\/a\u003e and \u003ca href=\"\/collections\/test-measurement\"\u003etest and measurement equipment\u003c\/a\u003e. Check the selected variant's availability before ordering.\u003c\/p\u003e\u003cstyle\u003e\n.ut-cat{color:#333;font-family:Arial,Helvetica,sans-serif;line-height:1.5;}\n.ut-cat h4{color:#1a1a1a;font-size:1.15em;margin:1.5em 0 .5em;padding-bottom:.25em;border-bottom:2px solid #ccc;}\n.ut-cat h2{color:#1a1a1a;font-size:1.25em;margin:1.2em 0 .4em;}\n.ut-cat h3{color:#222;font-size:1.05em;margin:1em 0 .3em;}\n.ut-cat p{margin:.6em 0;}\n.ut-cat ul{margin:.5em 0;padding-left:1.4em;}.ut-cat li{margin:.25em 0;}\n.ut-cat img{max-width:100%;height:auto;}\n.ut-cat table{border-collapse:collapse;width:100%;margin:.5em 0;}\n.ut-cat th,.ut-cat td{border:1px solid #ddd;padding:6px 10px;text-align:left;vertical-align:top;}\n.ut-cat td strong{color:#222;}\n\u003c\/style\u003e\n\u003cdiv class=\"ut-cat\"\u003e\n\n\u003ch4\u003eOverview\u003c\/h4\u003e\n\u003cdiv class=\"product-container\"\u003e\n\u003cp\u003eThe UDP3303C is the SCPI-programmable counterpart to the UDP3303A — 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.\u003c\/p\u003e\n  \u003cp\u003eProgramming 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"product-key-features\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree Channels, 195W Total — SCPI Programmable\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB-Device + RS-232 with SCPI\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgramming Accuracy ≤0.1% + 30 mV\u003c\/strong\u003e — Voltage programming accuracy ≤0.1% + 30 mV; current programming accuracy ≤0.5% + 2 mA. Set value matches output value across the full range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCH3 Logic-Rail Selector\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinear Topology, ≤1 mVrms Ripple\u003c\/strong\u003e — Clean DC output for low-noise analog work. Load regulation ≤0.01% + 3 mV in CV mode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 mV \/ 1 mA Resolution\u003c\/strong\u003e — Four-digit voltage and current display per channel on EBTN LCD.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries, Parallel, and Tracking Modes\u003c\/strong\u003e — Combine CH1+CH2 for up to 60V series or 6A parallel from the front panel. SCPI exposes the same modes for automated test integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOVP \/ OCP \/ OTP Protection\u003c\/strong\u003e — Configurable per-channel thresholds, plus over-temperature shutdown and keypad lock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFive Preset Storage Groups\u003c\/strong\u003e — M1–M5 store full instrument states for fast bench setup. Shutdown memory restores last settings on power-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront-Panel 5V\/2A USB Charging Port (CH4)\u003c\/strong\u003e — Independent 5V\/2A USB-A charging output. Charging output only — the data interfaces are USB-Device and RS-232 on the back panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware Output Disable via Digital I\/O\u003c\/strong\u003e — Two-pin Digital I\/O terminal for emergency cutoff and external interlock circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eDetailed Features\u003c\/h2\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003ch3\u003eCH3 Logic-Rail Selector — One Button, Four Voltages\u003c\/h3\u003e\n\u003cp\u003eMost 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000-buttons.jpg\" alt=\"UNI-T UDP3303C — ch3 logic-rail selector\" class=\"product-image-thumb\"\u003e\n\n\u003cfigcaption class=\"product-figcaption\"\u003eUNI-T UDP3303C — ch3 logic-rail selector\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000-buttons.jpg\" alt=\"UNI-T UDP3303C — ch3 logic-rail selector\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eUNI-T UDP3303C — ch3 logic-rail selector\u003c\/span\u003e\n\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000_save_recall.jpg\" alt=\"UNI-T UDP3303C — scpi programmable for repeatable bench work\" class=\"product-image-thumb\"\u003e\n\n\u003cfigcaption class=\"product-figcaption\"\u003eUNI-T UDP3303C — scpi programmable for repeatable bench work\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003ch3\u003eSCPI Programmable for Repeatable Bench Work\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000_save_recall.jpg\" alt=\"UNI-T UDP3303C — scpi programmable for repeatable bench work\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eUNI-T UDP3303C — scpi programmable for repeatable bench work\u003c\/span\u003e\n\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cdiv class=\"product-app-grid\"\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eR\u0026amp;D Bench \u0026amp; Prototyping\u003c\/h3\u003e\n\u003cp\u003eThree 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eAutomated Test Lab Integration\u003c\/h3\u003e\n\u003cp\u003eSCPI 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eTeaching Labs \u0026amp; Automated Lab Exercises\u003c\/h3\u003e\n\u003cp\u003eFor 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eMixed-Signal Development\u003c\/h3\u003e\n\u003cp\u003eCH1 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat's the difference between the UDP3303A and the UDP3303C?\u003c\/p\u003e\n\u003cp\u003eThe UDP3303C adds SCPI programmability over USB-Device and RS-232. Hardware (channels, voltage, current, power, CH3 logic-rail selector, protection, display, dimensions) is otherwise identical. Choose the UDP3303A if your bench is knob-only; choose the UDP3303C if you need automated test integration. For 5A per adjustable channel instead of 3A, step up to the UDP3305C.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eDoes the UDP3303C have LAN?\u003c\/p\u003e\n\u003cp\u003eNo. The UDP3303C's data interfaces are USB-Device (back-panel SCPI port for PC connection) and RS-232. If your workflow needs LAN with LXI\/web interface, the UDP3000S series adds it on the same linear-PSU platform. The Digital I\/O pin pair on the back panel handles hardware ON\/OFF — useful for external interlocks but not for data communication.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat is the front-panel USB port for?\u003c\/p\u003e\n\u003cp\u003eIt's a 5V\/2A USB-A charging output (CH4) — for charging a phone or powering a USB-powered demo board. It is explicitly not a data interface. The SCPI data ports are on the back panel: USB-Device and RS-232.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eCan the UDP3303C run automated voltage\/current sweeps?\u003c\/p\u003e\n\u003cp\u003eYes — SCPI control over USB-Device or RS-232 supports remote voltage and current setpoint commands plus readbacks, and the five preset storage groups (M1–M5) keep frequently used configurations available for fast recall. For complex programmable waveform output (list\/delayer functions), the UDP3000S series adds those capabilities on the same linear platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhy a linear supply instead of switching for SCPI work?\u003c\/p\u003e\n\u003cp\u003eLinear topology produces fundamentally cleaner output — no switching frequency, no harmonic spurs, ripple under 1 mVrms. SCPI control gives you automation; linear regulation keeps the output clean enough for the precision measurements that automated test usually exists to take in the first place. The trade-off is lower efficiency and more heat, which at 195W bench-supply scale is not a meaningful constraint.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat's included with the UDP3303C?\u003c\/p\u003e\n\u003cp\u003eThe UDP3303C ships with the instrument, power cord, USB communication cable (UT-D14), RS-232 communication line, alligator clip test leads, English user manual Ships from authorized US dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUDP3303C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 programmable (CH1, CH2 adjustable; CH3 selectable) + CH4 USB charging output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCH1, CH2 Output Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–30V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCH1, CH2 Output Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–3A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCH3 Output Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.8V \/ 2.5V \/ 3.3V \/ 5V (±3%, fine-tunable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCH3 Output Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTotal Output Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e195W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCH4 USB Charging Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V \/ 2A (front-panel USB charging output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Regulation (CV)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤0.01% + 3 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Regulation (CC)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤0.2% + 3 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProgramming Accuracy (Voltage)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤0.1% + 30 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProgramming Accuracy (Current)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤0.5% + 2 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRipple \u0026amp; Noise (Voltage)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤1 mVrms (20Hz–20MHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRipple \u0026amp; Noise (Current)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤3 mArms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Coefficient\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤300 ppm\/°C (V\/I)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries Mode (CH1+CH2)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 60V (CH1+CH2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParallel Mode (CH1+CH2)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 6A (CH1+CH2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEBTN LCD, 4-digit voltage + current per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProgrammable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes — SCPI over USB-Device or RS-232\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterfaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB-Device, RS-232, Digital I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMemory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 preset storage groups (M1–M5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOVP, OCP (per-channel, configurable), OTP, keypad lock, shutdown memory\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAC Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 \/ 120 \/ 220 \/ 230V ±10%, 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (W × H × D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e240 × 168 × 347 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8.8 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch4\u003eDocumentation\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/instruments.uni-trend.com\/download?cate=34\"\u003eUDP3303C Datasheet, User Manual, and Software\/Firmware Downloads\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eOptions \u0026amp; Accessories\u003c\/h4\u003e\n\n\u003cp\u003eIncluded in box:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePower cord\u003c\/li\u003e\n  \u003cli\u003eEnglish download guide\u003c\/li\u003e\n  \u003cli\u003emulti-language safety manual\u003c\/li\u003e\n  \u003cli\u003ecalibration report (COC)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"UNI-T","offers":[{"title":"181730080304X","offer_id":60716910641438,"sku":"181730080304X","price":364.99,"currency_code":"USD","in_stock":true},{"title":"181400100640X","offer_id":60716910674206,"sku":"181400100640X","price":364.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1101\/2148\/4574\/files\/UDP3303C_Cables.jpg?v=1793221529"},{"product_id":"utp3303-3ch-207w-32v-3a-linear-dc-power-supply","title":"UNI-T UTP3303 Linear DC Power Supply — 3 Channels, 207W","description":"\u003cp\u003e\u003cstrong\u003eImage note:\u003c\/strong\u003e Supplier-provided photos show the related UTP3305 as a series illustration. This listing is for the UTP3303, rated at 3A per adjustable channel.\u003c\/p\u003e\u003cp\u003eThe UNI-T UTP3303 is a manually controlled, three-channel linear bench power supply. Two channels provide 0–32V at 0–3A, with a fixed 5V\/3A third output. It does not offer USB data, LAN or SCPI control. This is a discontinued model with remaining distributor stock.\u003c\/p\u003e\u003cp\u003eBrowse \u003ca href=\"\/collections\/uni-t\"\u003eUNI-T instruments\u003c\/a\u003e and \u003ca href=\"\/collections\/test-measurement\"\u003etest and measurement equipment\u003c\/a\u003e.\u003c\/p\u003e\u003cstyle\u003e\n.ut-cat{color:#333;font-family:Arial,Helvetica,sans-serif;line-height:1.5;}\n.ut-cat h4{color:#1a1a1a;font-size:1.15em;margin:1.5em 0 .5em;padding-bottom:.25em;border-bottom:2px solid #ccc;}\n.ut-cat h2{color:#1a1a1a;font-size:1.25em;margin:1.2em 0 .4em;}\n.ut-cat h3{color:#222;font-size:1.05em;margin:1em 0 .3em;}\n.ut-cat p{margin:.6em 0;}\n.ut-cat ul{margin:.5em 0;padding-left:1.4em;}.ut-cat li{margin:.25em 0;}\n.ut-cat img{max-width:100%;height:auto;}\n.ut-cat table{border-collapse:collapse;width:100%;margin:.5em 0;}\n.ut-cat th,.ut-cat td{border:1px solid #ddd;padding:6px 10px;text-align:left;vertical-align:top;}\n.ut-cat td strong{color:#222;}\n\u003c\/style\u003e\n\u003cdiv class=\"ut-cat\"\u003e\n\n\u003ch4\u003eOverview\u003c\/h4\u003e\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eLinear 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"product-key-features\"\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree Channels, 207W Total\u003c\/strong\u003e — CH1 and CH2: 0–32V \/ 0–3A adjustable. CH3: fixed 5V \/ 3A for logic-level power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinear Topology, ≤1 mVrms Ripple\u003c\/strong\u003e — Clean DC output with no switching frequency, no harmonic spurs, and load regulation of CV ≤1×10⁻⁴ + 3 mV.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto CV\/CC Crossover with Current Limit Protection\u003c\/strong\u003e — The supply transitions automatically between constant-voltage and constant-current operation when the load steps, protecting both the DUT and the supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries and Parallel Modes\u003c\/strong\u003e — Combine CH1+CH2 for up to 64V series or 6A parallel — front-panel selectable, no external wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCH1\/CH2 Master-Slave Tracking\u003c\/strong\u003e — Tracking mode synchronizes CH1 and CH2 for matched-rail testing (op-amp ±supplies, balanced analog stages, dual-supply mixed-signal designs).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Bit Voltage and Current Dual Display\u003c\/strong\u003e — Independent voltage and current readouts per channel. No menus, no hidden settings — what you see is what the channel is doing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput ON\/OFF Control\u003c\/strong\u003e — Front-panel master output button keeps you in command of when current actually leaves the supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnob-and-Button Operation\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eBench Power That Stays Out of the Way\u003c\/h2\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eFor 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\u0026amp;D benches, it's the supply you reach for when you don't want to think about the supply.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cdiv class=\"product-app-grid\"\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eTeaching Labs \u0026amp; Trade Schools\u003c\/h3\u003e\n\u003cp\u003ePer-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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eAnalog Bench Development\u003c\/h3\u003e\n\u003cp\u003eDual 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eService \u0026amp; Repair\u003c\/h3\u003e\n\u003cp\u003eReliable 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eMaker \u0026amp; Hobbyist Workshops\u003c\/h3\u003e\n\u003cp\u003eThree-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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eDoes the UTP3303 have USB or SCPI?\u003c\/p\u003e\n\u003cp\u003eNo. 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).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat's the difference between the UTP3303 and the UTP3305?\u003c\/p\u003e\n\u003cp\u003eOutput 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhy a linear supply instead of switching?\u003c\/p\u003e\n\u003cp\u003eLinear 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat's included with the UTP3303?\u003c\/p\u003e\n\u003cp\u003eThe UTP3303 ships with the instrument, power cord, output cables, English user manual Ships from authorized US dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUTP3303\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 (CH1, CH2 adjustable; CH3 fixed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCH1, CH2: 0–32V\u003cbr\u003eCH3: 5V (fixed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCH1, CH2: 0–3A\u003cbr\u003eCH3: 3A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTotal Output Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e207W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Regulation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCV ≤1×10⁻⁴ + 3 mV\u003cbr\u003eCC ≤2×10⁻⁴ + 3 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRipple \u0026amp; Noise\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVoltage: ≤1 mVrms\u003cbr\u003eCurrent: ≤3 mArms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Regulation Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCV: 100 mV (typical)\u003cbr\u003eCC: 10 mA (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTracking Bias (CH1\/CH2)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5×10⁻³ + 10 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-bit voltage and current dual display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndependent, Series, Parallel, CH1\/CH2 Master-Slave Tracking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCurrent limit protection with auto CV\/CC crossover, output ON\/OFF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReliability\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMTBF ≥ 2,000 hrs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAC Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e115V \/ 230V AC, 47–63 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (W×D×H)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e260 × 170 × 315 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8.7 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch4\u003eDocumentation\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/instruments.uni-trend.com\/download?cate=43\"\u003eUTP3303 Datasheet, User Manual, and Software\/Firmware Downloads\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eOptions \u0026amp; Accessories\u003c\/h4\u003e\n\n\u003cp\u003eIncluded in box:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePower cord\u003c\/li\u003e\n  \u003cli\u003eEnglish download guide\u003c\/li\u003e\n  \u003cli\u003emulti-language safety manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"UNI-T","offers":[{"title":"Default Title","offer_id":60716916375838,"sku":"181730090200X","price":209.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1101\/2148\/4574\/files\/UTP3305-1.png?v=1793221757"},{"product_id":"utp3305-3ch-335w-32v-5a-linear-dc-power-supply","title":"UNI-T UTP3305 335W 3-Channel Linear DC Power Supply","description":"\u003cp\u003eThe UNI-T UTP3305 is a 335W linear DC bench power supply for circuit development, repair and electronics teaching. Two adjustable channels supply 0–32V at 0–5A; a third provides fixed 5V at up to 3A.\u003c\/p\u003e\u003ch2\u003eOutput and controls\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eIndependent, series, parallel and master-slave tracking modes.\u003c\/li\u003e\n\u003cli\u003eConstant-voltage and constant-current operation with current limiting.\u003c\/li\u003e\n\u003cli\u003eSpecified ripple and noise: up to 1mVrms in CV mode and 3mArms in CC mode.\u003c\/li\u003e\n\u003cli\u003eTypical adjustment resolution: 100mV voltage and 10mA current.\u003c\/li\u003e\n\u003cli\u003eFront-panel voltage and current readouts with physical controls.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhich model should I choose?\u003c\/h2\u003e\u003cp\u003eChoose the UTP3305 when you need up to 5A on either adjustable channel. The UTP3303 provides up to 3A. This model is not the UTP3305-II and has no USB, LAN or SCPI remote-control interface.\u003c\/p\u003e\u003ch2\u003eSetup and included items\u003c\/h2\u003e\u003cp\u003eThe distributor lists a power cord, English download guide and multilingual safety manual. Its package descriptions differ on output cables, so confirm application-specific leads before ordering. Check the instrument’s input-voltage selector, local supply and supplied safety instructions before connection. Input specification: 115V\/230V AC, 47–63Hz.\u003c\/p\u003e\u003cp\u003eExplore \u003ca href=\"\/collections\/test-measurement\"\u003etest and measurement equipment\u003c\/a\u003e and \u003ca href=\"\/collections\/uni-t\"\u003eUNI-T instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"UNI-T","offers":[{"title":"Default Title","offer_id":60718739423518,"sku":"181730090193X","price":223.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1101\/2148\/4574\/files\/UTP3305-1_e7973a27-081f-40ed-96a1-9a8518a516a7.png?v=1793238442"}],"url":"https:\/\/apextechnica.com\/collections\/bench-power-supplies.oembed","provider":"Apex Technica","version":"1.0","type":"link"}