The UDP6731 is a 360W programmable DC switching power supply with a 80 V × 15 A wide-range output, RS-232 with full SCPI control, 600-group memory, list mode and OVP/OCP/OTP protection.

High-voltage 360W class. The 80V × 15A envelope covers 48V automotive/telecom, 60V/72V battery packs, GaN/SiC pre-drivers, and any rail above the 60V ceiling of UDP6720/UDP6721.

It's built for a workbench that runs the same supply across product design, board debug, and deployed test fixtures — affordability where the spec sheet doesn't punish it, precision where the load demands it, and an interface direct enough that the next person sitting down doesn't need a manual.

Across the Design. Debug. Deploy.™ Lifecycle

The UDP6700 series fits the workflow we call Design. Debug. Deploy. — the three-act cycle most engineering teams actually run a power supply through.

In Design, list mode and 600 memory groups let a planned voltage profile execute repeatably while the rest of the bench attends to capture and analysis.

In Debug, OVP/OCP/OTP protections, remote sense compensation, and a 4-digit dual LED display make it safe to push a marginal load and see exactly what's happening at the terminals.

In Deploy, RS-232 with full SCPI command coverage means the same supply that ran on the design bench can drop into a production rack and be controlled by the same scripts. One instrument, three phases, no relearning.

• 360 W rated power, 80 V × 15 A wide envelope — Up to 80 V at 4.5 A or 24 V at 15 A — same 360 W envelope, no second instrument
• Wide-range output with power ratio 3.0 — one supply covers V/I combinations that would otherwise require two
• Programmable list mode: 9 steps per list, 1 ms to 9999 s per step, repeat 1–9999 cycles
• Trigger delayer: 9 trigger groups, 1 ms to 9999 s per trigger
• 600 memory groups (M1: 100 / M2: 100 / M3: 400) for stored output configurations
• Over-voltage, over-current, and over-temperature protection with set ranges 0–110% of rated
• Remote sense compensation for accurate output at the load terminals over long leads
• RS-232 with full SCPI command coverage; a software-only PC controller is included
• Smart fan: load- and temperature-controlled for low audible noise at light load
• 4-digit dual LED display with simultaneous V and I readout
• OVP/OCP thresholds set with a long-press on the V or I key — no menu dive
• Knob and direct numeric entry on the front panel; both work the same way
• Software calibration retains traceability without an internal trim-pot pass

Wide-Range Output (Power Ratio 3.0)

Power ratio 3.0 means the rated output envelope can be redistributed between voltage and current as the load demands. Where a fixed-rectangle supply would force a tradeoff — buy enough volts or enough amps — the UDP6700 lets you trade one for the other along a constant-power curve. Most general-purpose bench work sits inside that envelope, so one supply does the work of two.

The exact V × I corners depend on rated power; the spec table below shows the maximum voltage at rated current and the maximum current at rated voltage for this SKU.

Remote Sense Compensation

Long leads drop volts. At 5 A through 1 m of 18-AWG wire, the lead drop is around 100 mV — enough to sour a 3.3 V regulator test or starve a battery cycler. Remote sense routes the regulation feedback past the leads to the load terminals themselves, holding the programmed voltage where it actually matters.

The remote sense terminals are wired separately from the output terminals on the rear panel; the supply auto-detects sense connection and falls back to local sensing if the wires are removed.

OVP / OCP / OTP Protection

Three independent protections cover the most common ways a load fails: a short or low-impedance fault drives current up (OCP), a misconfigured DUT pulls voltage out of spec (OVP), or a sustained over-load heats the supply itself (OTP). All three trip the output off and display a fault state on the front panel.

OVP and OCP thresholds are set with a long-press on the V or I key — set the threshold once, run the load. No menu dive, no nested submenu. OTP is internal and not user-configurable.

List Mode and Trigger Delayer

List mode runs a 9-step voltage and current sequence with each step held from 1 ms to 9999 s and the whole list repeated 1 to 9999 cycles. Useful for battery cycling, automotive cold-crank profiles, and any scripted sequence that needs to run unattended.

Trigger delayer fires 9 trigger groups with delays between 1 ms and 9999 s. Useful when an output transition needs to wait for an external event — DUT settling, fixture motion, an oven step — before moving to the next setting.

600 Memory Groups (M1 / M2 / M3)

Three memory banks store 100, 100, and 400 output configurations. M1 and M2 are typically used for active recipes (the configuration in the front-panel knob workflow); M3 holds 400 long-term recall configurations for products and DUTs the bench works on regularly.

Each memory entry stores voltage setting, current setting, OVP and OCP thresholds, and the slope/list state. Recall is a single front-panel keypress.

RS-232 with Full SCPI Command Coverage

RS-232 with full SCPI command set. Voltage and current setpoint, OVP/OCP threshold, list configuration, memory recall, output enable, and readback all accessible from a host script. The included Windows PC software exposes the same commands through a GUI for users who don't want to write code.

RS-232 is honest about what it is: one supply per host port, no LAN, no USBTMC. For multi-instrument benches with more than one programmable supply or for remote/automated environments, the UDP6900B series adds USB, LAN with web control, RS-485 with Modbus, and multi-machine daisy-chain.

Thermal Derating

The UDP6731 delivers full 360 W rated output at ambient temperatures up to about 30 °C. Above that, output power derates linearly to maintain internal junction temperatures inside the safe envelope. The derating curve below shows the exact relationship between ambient temperature and rated power for this SKU. Operating temperature range is 0–40 °C.

The smart fan adjusts speed automatically based on load and internal temperature; light-load operation is quiet, and the supply only ramps fan speed when thermal headroom requires it.

Applications

48V/60V Telecom and Industrial

The 80 V ceiling clears the 48 V telecom rail (with margin for ripple and transient testing) and the 60 V industrial rails common in solar combiners, PoE++ injectors, and industrial DC-bus front-ends. 15 A at 48 V is 720 W of effective work in a 360 W rated chassis — possible because the UDP6731 trades amps for volts on a constant-power curve.

GaN/SiC Pre-Driver and Gate-Driver Bench

Wide-bandgap converter R&D often runs gate-driver and pre-driver boards from 24 V / 48 V / 80 V auxiliary rails. UDP6731 supplies that auxiliary bus with low-enough noise to not contaminate the measurement and high-enough current to source the gate charge of the silicon under test.

Battery Pack R&D (60V class)

14S to 18S Li-ion packs, 60 V e-bike packs, 72 V industrial battery work. The 80 V ceiling covers the full charge voltage of these packs (typically 60–75 V); 15 A is sufficient for charge work and most discharge sourcing scenarios short of full-pack burn-in.

Solar Inverter Aux-Power Bench

String inverters and microinverters typically run their control electronics from a 60–80 V auxiliary rail derived from the DC bus. UDP6731 sources that aux rail directly during bench testing without needing a separate buck converter.

Specifications

Options & Accessories

Every UDP6700 ships with a power cord, a quick-start guide, the Windows PC software (download), an RS-232 cable and a calibration certificate. Test leads with alligator clips are an optional accessory and not included in the base configuration.

• Power cord (region-specific)
• RS-232 communication cable
• Quick-start guide
• PC software (free download)
• Factory calibration certificate

FAQ's

UDP6731 vs UDP6730 — high-voltage vs high-current

Both are 360 W. UDP6731 is 80 V × 15 A — the high-voltage side. UDP6730 is 40 V × 30 A — the high-current side. Choose UDP6731 when the load is 48 V or 60 V or 72 V (telecom, battery pack, GaN/SiC pre-driver, solar inverter aux); choose UDP6730 when the load is 12 V or 24 V and the bottleneck is amps. The 80 V ceiling is what UDP6731 buys you; everything else is shared.

Where does this fit relative to the UDP6900B series?

The UDP6900B series is the next step up. Same form factor, same wide-range output philosophy, but adds USB and LAN with web control, RS-485 with Modbus, multi-machine daisy-chain, slope-mode output, auto-range mode, and a built-in DVM. If a single supply on a single host port satisfies the bench, the UDP6700 is the right choice; if the bench has multiple programmable supplies, needs LAN access, or runs scripted multi-instrument tests, UDP6900B is the right step up.

Where does this fit relative to the UDP3000C series?

The UDP3000C series is multi-channel linear, not single-channel switching. If the bench needs two or three independent isolated outputs in one chassis (rail + bias + reference, for example), UDP3000C is the right tool. UDP6700 is the right tool when a single high-power output beats three medium-power outputs.

What's in the box?

Power cord, RS-232 cable, quick-start guide, factory calibration certificate. Windows PC software is a free download. Test leads with alligator clips are an optional accessory and not included in the base configuration.

Is the chassis 1U rack-mountable?

No. The chassis is 174 mm tall (about 6.85 inches), which is a desktop form factor — not 1U (44.45 mm). It will fit on a shelf in a standard 19-inch rack but will not mount in a 1U slot. UNI-T does not currently offer a rack-mount kit for the UDP6700 series.

Part of the UDP6700 programmable DC switching power supply series. See also UDP6721, UDP6730, UDP6731.