The UDP6953B is UNI-T's 600W programmable DC switching supply at the 150V class — the spec for SiC half-bridge characterization, fast EV charger DC-link emulation and high-power solar inverter input stress testing.

Auto-range output delivers up to 150V at reduced current, 10A at reduced voltage, or any combination within the 600W envelope from a single instrument.

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.

Across the Design. Debug. Deploy.™ Lifecycle

Design. Sourcing the bench supply for a SiC half-bridge characterization or EV charger DC-link emulator is the first commit. 600 W and 150 V at 1 mV / 0.1 mA resolution covers the operating envelope where wide-bandgap power electronics actually live, with the four-wire sense and slope-controlled startup that DUT-protective work requires from the first turn-on. Affordability meets precision: the UDP6953B replaces a far more expensive programmable supply for the same V/I/W envelope and resolution.

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 efficiency 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.

• 600W Auto-Range Output (0–150V, 0–10A) — 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.

Auto Range Functionality

Across the full 600 W envelope, the UDP6953B reconfigures from 150 V at 4 A — for high-voltage stress testing of SiC gate drivers and PV inverter input stages — down to 10 A at 60 V for low-voltage SiC half-bridge characterization, all from one instrument. Auto-range output is controlled by the rated power envelope, not by hardware range switching, which means a single supply replaces what most labs run as two: a high-voltage low-current rail and a lower-voltage higher-current rail.

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

SiC/GaN Power Electronics Development

150V at 10A in a 600W envelope is the spec for SiC half-bridge characterization, GaN device-level bench work below the 100V class, and the rising tier of wide-bandgap power electronics R&D. Slope control provides clean rise/fall for sensitive HV gate-drive supplies.

EV Charging & High-Voltage DC Bus

Fast-charger DC-link voltage emulation for AC/DC and DC/DC stage qualification, 100V-class EV traction inverter front-end testing, and high-voltage power converter bench work. Auto-range gives flexible V/I combinations within the 600W envelope.

Solar Inverter & Renewable Energy Bench

150V output suits solar inverter input-stage testing, MPPT algorithm validation under controlled source conditions, and string-inverter front-end development. List mode runs realistic PV-curve profiles for repeatable testing.

Industrial HV Test Lab

Full SCPI over USB, RS-232, RS-485, and LAN. The built-in 4½-digit DVM (up to 160V DC) monitors a second voltage point during HV testing without an external instrument. Web control via browser; multi-machine RS-485 for scaled configurations.

Specifications

FAQ's

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

On the UDP6953B, 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.

Is the UDP6953B suitable for SiC and GaN device characterization?

For SiC and GaN device-level work below the 100V class, yes — the 150V output covers gate-drive supply rails, accessory-circuit power, and 100V-class DC bus emulation. For higher-voltage SiC work specifically (650V or 1200V class), this supply provides the auxiliary low/medium-voltage rails; the high-voltage DUT rails come from a higher-class HV supply outside the UDP6900B family.

What does auto-range mean?

Auto-range means the supply delivers any voltage/current combination within the rated 600W envelope. The UDP6953B can output 150V at reduced current or 10A 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 UDP6953B?

The UDP6953B ships with the instrument, power cable Test leads and sense leads available separately.

How does the UDP6953B compare to the UDP6933B for high-voltage SiC work?

Both reach 150 V; the UDP6953B doubles the current capacity (10 A vs 5 A) and triples the power envelope (600 W vs 200 W). For SiC half-bridge characterization where the device under test draws meaningful current at full bus voltage — bus-cap charging, shoot-through fault testing, switching loss measurement under continuous load — the UDP6953B handles the working point the UDP6933B can only momentarily touch. For lower-current work like dielectric stress and gate-leakage measurement, the UDP6933B is the value-tier match.