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. 

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. Auto-range gives flexible V/I combinations within the rated 200W envelope. 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.

Across the Design. Debug. Deploy.™ Lifecycle

Design. Sourcing the bench supply for high-voltage DC bus characterization is the first commit. 200 W and 150 V at 1 mV / 0.1 mA resolution covers the operating envelope where high-voltage power electronics actually live, with the four-wire sense and slope-controlled startup that DUT-protective work requires from the first turn-on. Programmable from the front panel or remotely — list mode, slope control, OVP/OCP, and DVM are first-class controls, not buried menu options.

Debug. At validation, the 4½-digit DVM and 512-group list mode replace a second DMM and an external sequencer. Capture power-up profiles, automate sweeps, and record DUT-side voltage drift while sourcing — without leaving the supply's front panel or rebuilding the test harness.

Deploy. Production go/no-go testing runs over LAN with SCPI, Multi-SCPI, or Modbus RTU. The web server gives a shared bench remote access without a host-software install. RS-485 multi-machine networking scales the station as the throughput requirement does. From first prototype to production verification — design, debug, deploy.

• 200W Auto-Range Output (0–150V, 0–5A) — Flexible V/I combinations within rated power. One supply handles multiple test configurations.
• High Accuracy & Low Ripple — 1 mV/0.1 mA resolution with low ripple and noise for sensitive DUT testing.
• OVP/OCP Protection — Independent over-voltage and over-current protection with configurable thresholds protects devices under test.
• List Mode & Delay Function — Program voltage/current sequences with configurable timing for automated test profiles and battery charge simulation.
• Slope Control — Configurable rise/fall rates for soft start/stop, preventing inrush damage to sensitive loads.
• Remote Sense — Four-wire sensing compensates for voltage drop in test leads, ensuring accurate voltage at the load terminals.
• Built-In DVM — Independent digital voltmeter for monitoring a second voltage point without additional equipment.
• Web Remote Control & Multi-Machine — Browser-based control via LAN. Master/slave communication for series/parallel multi-unit configurations.

Front-Panel Interface

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.

Remote Sense

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.

Over-Voltage/Over-Current Protection (OVP/OCP)

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 Output and Delay Function

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.

Slope Mode Options

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.

Auto Range Functionality

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.

Built-in Digital Voltmeter (DVM)

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.

Multiple Main Menu Options

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.

Computer Software and Remote Control

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.

Multi-Machine Communication

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.

Web Control

LAN connection brings up an embedded web server — open the supply's IP in any browser to set parameters, run list and delay programs, and configure system settings. No vendor application install on the host machine, no driver headache when the bench runs Linux or a tablet workstation. For shared lab benches and remote-monitored automation, the browser interface is often the cleanest path.

Applications

Higher-Voltage Power Electronics R&D

150 V output suits SiC and GaN gate-drive supply emulation, 100V-class DC bus characterization, MOSFET/IGBT bias-supply testing, and the higher-voltage power-electronics workloads where 60V models run short. Slope control gives controlled rise/fall for sensitive HV gate-drive circuits.

Built-In DVM for HV Measurement

The integrated 4½-digit voltmeter measures up to 160V DC through the rear inputs — a second monitoring point on the DUT without an external instrument. Useful for HV bus voltage tracking during converter or inverter development.

Test Lab & Industrial Automation

Full SCPI over USB, RS-232, RS-485, and LAN integrates into VISA-based and PLC-controlled test rigs. Web control via browser. External analog interface accepts 0–10V control input for multi-supply coordination.

Component Stress Testing

List mode runs HV bias-stress profiles for capacitor, transformer, and isolation testing. OVP/OCP set independently for tight protection envelopes when sourcing close to a DUT's voltage limit. Auto-range gives flexible V/I combinations within the 200W envelope.

Specifications

Options & Accessories

Included in box:

• Power Cord
• English download guide
• multi-language safety manual
• calibration report (COC)

FAQ's

What does the built-in DVM measure on this model?

On the UDP6933B, the built-in 4½-digit voltmeter measures DC voltages up to 160V through rear-panel terminal inputs (vs 65V on the lower-voltage UDP6900B models). Useful for monitoring a second voltage point on the DUT — e.g., HV bus voltage during converter dev — without an external instrument.

What does auto-range mean?

Auto-range means the supply delivers any voltage/current combination within the rated 200W envelope. The UDP6933B can output 150V at reduced current or 5A at reduced voltage — the power limit is the constraint, not fixed V/I maximums independently.

What's the difference between the UDP6700 and UDP6900B series?

This family (UDP6900B) sits above the UDP6700, adding auto-range output, slope control, built-in DVM, web control over LAN, RS-485 for multi-machine networking, USB Device, Modbus RTU, and external analog control. UDP6700 provides the core CV/CC + list-mode + remote-compensation feature set with RS-232 SCPI at a lower price.

Can I connect multiple UDP6900B units for higher power?

Yes. Multi-machine communication via RS-485 enables master/slave configurations — connect units in series for higher voltage or parallel for higher current, controlled from a single master or via SCPI commands.

What's included with the UDP6933B?

The UDP6933B ships with the instrument, power cable Test leads and sense leads available separately.