Overview

The UDP6933B is a 200W programmable DC switching supply at the 150V class — for SiC and GaN gate-drive supply emulation, 100V-class DC bus work, and the higher-voltage power-electronics workloads where 60V supplies in the family run short. Auto-range gives flexible V/I combinations within the rated 200W envelope.

Full programmable interface set: USB Device, USB Host, RS-232, RS-485, LAN with web control, and external analog I/O — with SCPI, Multi-SCPI, and Modbus RTU command support. Built-in 4½-digit DVM monitors a second voltage point on the DUT without an external instrument. Slope control configures rise/fall rates independently in voltage-slope (VSR) and current-slope (ISR) modes for soft start/stop. Remote sense (S+/S−) compensates for IR drop on the test leads. List mode and delayer functions program up to 512 voltage/current/time groups, stored to internal Flash or USB.

A 4.3-inch true color LCD shows set voltage and current alongside actual output values, with output power computed and displayed in real time. The numeric keypad sets values directly without menu diving; the rotary encoder fine-tunes when a small adjustment is faster than typing. Soft-keys map to the function actually in use — list mode, slope, OVP/OCP, or DVM — instead of burying them in nested menus. Output enable is a dedicated hardware button, always visible, never one click away from a keystroke mistake.

Long test leads drop voltage. At higher currents, the drop is no longer a rounding error — a 10 A draw across a meter of 16 AWG returns roughly 50 mV less to the load than the supply set. The UDP6900 series corrects for this with four-wire remote sense: connect the output's + and − terminals to the load through the current-carrying leads, then run a separate pair from S+ and S− directly to the device under test. The supply servo's regulation point shifts from its own terminals to the load's terminals — and the 1 V SENSE compensation headroom keeps the rail accurate where it actually matters.

Independent over-voltage and over-current thresholds, both set from the front panel. When either limit trips, the supply latches output off and posts the trigger on the LCD — the kind of unambiguous fault state that matters when a DUT failure during overnight characterization could otherwise damage hardware or lose a test run. Thresholds persist across power cycles and survive front-panel lock for unattended operation.

List mode programs up to 512 voltage/current/time groups, executed in sequence — essential for high-voltage stress profiles (gradual ramp to 150 V dielectric withstand levels), PV emulation sequences (irradiance-dependent V/I curves over the day), or any time-varying high-voltage characterization. The delay function programs output on/off sequencing for HiPot test cycling. Files save to Flash or USB in .lst.csv and .dly.csv formats — Excel-editable.

Three configurable slope modes — Normal, Voltage Slope (VSR), and Current Slope (ISR) — that matter most at 150 V where uncontrolled rail ramps into capacitive loads (PV inverter input caps, dielectric test fixtures, gate-driver bias networks) can saturate inrush limiters or trigger DUT protection. VSR ramps voltage at a configurable rate per second; ISR ramps current. Soft-start at a known rate, every time.

150 V at 1.33 A or 5 A at 40 V — both within the 200 W envelope, both from a single front panel, both reconfigured on demand without changing instruments. For high-voltage prototyping where the DUT's operating point sweeps across the V/I plane (PV emulation, high-voltage gate driver supply, dielectric stress), the UDP6933B replaces a fixed-range high-voltage supply plus a low-voltage characterization supply with one instrument.

A built-in 4½-digit voltmeter measures DC voltage on a separate rear-panel pair, displayed alongside the supply's own readbacks on the LCD. For a two-rail bench scenario — measuring the load's regulated DC at the same time the supply is sourcing it — the DVM eliminates a second instrument. Range is 0.001–65.000 V on the 60 V models, up to 160 V on the UDP6933B and UDP6953B.

The main menu structure is shallow by design. Five top-level sections — Monitor, System Settings, User Group, Output Settings, Language — each one or two presses from the front panel. Monitor displays live V/I/P/DVM with per-channel alarms when set conditions deviate. Output Settings configure operating mode, power-up output, and slope. System Settings hold backlight, sound, RS-232/network, and a factory-default restore. The menu hierarchy never exceeds two levels — depth defeats front-panel work, and the UDP6900 doesn't ask the operator to memorize trees.

The UDP6900 series ships with free PC control software — UNI-T's UDP9000 host application, common across the programmable PSU line. Set voltage and current remotely, log readbacks to disk, sequence list and delay programs, and automate complete characterization runs without writing a SCPI parser. For scripted environments, the supply speaks SCPI, Multi-SCPI, and Modbus RTU natively over USB-Device, RS-232, RS-485, or LAN — pick the bus that fits the test station.

RS-485 networking links multiple UDP6900 supplies to a single host. Master/slave configurations enable series-stack for higher voltage or parallel-stack for higher current — useful for multi-rail bench setups or when a single test station needs more total power than one chassis provides. One SCPI session, many supplies, synchronized output.