UNI-T UDP6721 180W 60V/8A Basic DC Switching Power Supply
Overview
The UDP6721 is a 180W single-channel programmable DC switching power supply delivering 0–60V at 0–8A in a compact desktop chassis. Fully digital control, RS-232 with SCPI command support, list and delayer programming, remote sense compensation, and OVP/OCP/OTP protection — the core feature set a service bench, maintenance shop, or production-test station needs from a programmable switching supply at this power class.
The UDP6700 series uses a wide-range output topology (3.0 power ratio) — voltage and current can combine flexibly within the rated 180W envelope, letting one supply replace several smaller fixed-range units. A 2.8-inch full-color LCD displays voltage, current, and power simultaneously; a numeric keypad with a rotary encoder lets you set values directly without scrolling. Standard alligator-clip test leads ship in the box.
Affordability meets precision: a programmable industrial DC supply, 1U-rack-mount form, 100-240 V universal input, RS-232 SCPI, and the UNI-T 3+2 warranty — at the price an industrial maintenance line actually buys at.
Key Features
- 180W Programmable Switching Output (0–60V, 0–8A) — Fully digital control with 10 mV / 1 mA setting resolution and CV/CC operation.
- Wide-Range Output (Power Ratio 3.0) — Voltage and current combine flexibly within the rated 180W envelope. One supply replaces several smaller fixed-range units.
- RS-232 with SCPI — Programmable over the rear-panel RS-232 interface with full SCPI command support. Free PC software included for setup, control, and data logging.
- List Mode & Delayer Function — Edit up to 48 voltage/current/time points for automated test profiles. Delayer function supports power-on/off sequencing for reliability test and automation workflows.
- 600 Memory Groups (3 × 200 in M1/M2/M3) — Three named memory banks of 200 presets each. Save complete output configurations for one-button recall — generous storage for benches that test many different DUTs.
- Remote Sense Compensation — S+/S− terminals connect directly to the load to compensate for voltage drop in long lead wires. The displayed voltage is the load voltage, not the terminal voltage.
- OVP / OCP / OTP Protection — Over-voltage and over-current thresholds set via long-press on the V/A keys. Over-temperature shutdown protects the supply at high ambient or extended full-load operation.
- 2.8-inch Full-Color LCD — Voltage, current, and power displayed simultaneously. Customizable display layout and brightness.
- Software Calibration + Intelligent Fan Control — Field-calibrate the supply via the included software. Fan speed scales with internal temperature for quieter operation at light loads.
Built for Maintenance Benches and Production Stations
The UDP6700 series exists for the bench where the supply is part of the workflow, not the focus of it. Service shop techs replacing controller boards on industrial drives, maintenance benches qualifying repaired modules, production stations running automated test sequences against a known-good rail — these are the workloads the UDP6721 is sized and priced for.
RS-232 is the industrial-bench data interface that's been ubiquitous for forty years and refuses to die for good reasons: it works on every controller, every PLC programming interface, every test fixture's auxiliary port, and every legacy software stack you might be inheriting. SCPI over RS-232 means the supply slots into existing test fixtures without a USB-driver-update-and-reboot cycle. The 600 preset memory groups (3 × 200 named banks) handle the diversity of test setups a service bench accumulates over the years.
Applications
Industrial Maintenance & Service
Programmable switching supply for board-level service work, equipment troubleshooting, and module replacement testing. SCPI over RS-232 integrates into existing maintenance shop test fixtures and PLC-controlled test rigs. Wide-range output (power ratio 3.0) replaces several smaller bench supplies.
Production Test
List mode runs programmed voltage/current sequences without operator intervention. The 600-group preset memory holds setups for diverse DUTs across product lines. Remote sense ensures repeatable voltage at the load regardless of test-fixture lead variation.
R&D Bench & Component Evaluation
Direct numeric entry for fast voltage/current setting; fully digital control with 10 mV / 1 mA resolution. CV/CC operation handles unknown loads safely; OVP/OCP/OTP protect prototypes during fault investigation.
Education & Training Labs
OVP/OCP protection survives student wiring errors. Memory presets let an instructor lock in lab configurations for repeatable exercises. The compact desktop chassis fits a teaching bench layout without dominating it.
Specifications
| Model | UDP6721 |
| Channels | 1 programmable |
| Output Voltage | 0–60V |
| Output Current | 0–8A |
| Output Power | 180W |
| Setting Resolution | Voltage: 10 mV Current: 1 mA |
| Readback Resolution | Voltage: 10 mV Current: 1 mA |
| Load Regulation | Voltage: ≤0.01% + 3 mV Current: ≤0.01% + 3 mA |
| Line Regulation | Voltage: ≤0.01% + 3 mV Current: ≤0.1% + 3 mA |
| Programming Accuracy | Voltage: ≤0.05% + 10 mV Current: ≤0.2% + 2 mA |
| Readback Accuracy | Voltage: ≤0.05% + 10 mV Current: ≤0.1% + 2 mA |
| Ripple & Noise | Voltage: 2.0 mVrms Current: 5.0 mArms |
| Temperature Coefficient | Voltage: ≤100 ppm/°C Current: ≤200 ppm/°C |
| Display | 2.8-inch full-color LCD, 4-digit V/I/P simultaneous |
| Programmable | Yes — SCPI over RS-232 |
| Interfaces | RS-232; Remote sense (S+/S−) |
| List/Delayer | 48 editable points each |
| Memory | 600 groups (3 × 200 in M1/M2/M3) |
| Protection | OVP, OCP, OTP, intelligent fan |
| AC Input | 110V (±10%) / 220V (±10%), 50/60 Hz |
| Operating Temperature | 0–45°C |
| Dimensions (W×H×D) | 87 × 174 × 255 mm |
| Weight | 2.5 kg |
| Certifications | CE |
| Warranty | 3 years standard + 2 years with free registration (5 years total) |
Frequently Asked Questions
Does the UDP6721 have USB?
No. The UDP6721's data interface is RS-232 only. SCPI command support is provided over the RS-232 port; free PC software is included that handles the host-side connection. If your workflow specifically needs USB or LAN, the UDP6900B series adds USB, RS-485, LAN with web control, plus all the UDP6700 features.
What's the difference between the UDP6720 and the UDP6721?
Output current. UDP6720 delivers 0–5A (100W). UDP6721 delivers 0–8A (180W). Voltage range, interface, feature set, and chassis are otherwise identical. Choose UDP6720 if 5A is enough for the lighter loads on your bench; choose UDP6721 when bench work routinely needs above 5A but stays at or below 60V.
What is "wide-range output" / "power ratio 3.0"?
The supply's voltage and current can combine flexibly within the rated 180W envelope. The 3.0 ratio means the maximum voltage × maximum current is 3× the rated power, giving you flexibility to handle many DUTs from a single supply instead of needing several with fixed V/I ranges.
What's the difference between the UDP6700 and UDP6900B series?
The UDP6900B series is the next tier up. It adds auto-range output, slope control (controlled rise/fall), built-in DVM (digital voltmeter for a second measurement point), web remote control over LAN, RS-485 for multi-machine networking, USB Device, Modbus RTU support, and external analog control. The UDP6700 series provides the core CV/CC + list-mode + remote-compensation feature set with RS-232 SCPI at a lower price.
What's included with the UDP6721?
The UDP6721 ships with the instrument, power cord conforming to the destination country, alligator-clip test leads, and UNI-T's 3+2 warranty (3 years standard plus 2 additional years with free registration — 5 years total). Ships from authorized US dealer.
Warranty
This instrument is backed by UNI-T's 3+2 Year Warranty — 3 years of standard coverage, plus 2 additional years free when you register your product. That's 5 years of total protection at no extra cost.
The warranty covers manufacturing defects and component failures under normal use conditions. UNI-T instruments are built for professional daily use, and our warranty reflects that commitment to long-term reliability.
Data Sheets and Manuals
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