The UNI-T UDP5040-40 is a single-channel 400W programmable DC switching power supply delivering 0–40V and 0–40A with auto-ranging across the rated power envelope.
It pairs a wide output range with the regulation accuracy, source-emulation and remote control expected of a professional programmable supply.
Voltage accuracy is ±(0.05% of set + 0.05% of rated) and current accuracy ±(0.5% of set + 0.1% of rated); ripple is held to 50mV p-p with a 100 ppm/°C temperature coefficient. A 2.4-inch TFT-LCD shows voltage, current and power together, and full SCPI control over USB and LAN drops the UDP5040-40 straight into LabVIEW, Python-VISA or any ATE framework.
Choosing Your Model: UDP5000 Series
The UDP5000 name spans 20 models built on one platform: five voltage classes (40 V / 80 V / 160 V / 250 V / 800 V) across four power classes (400 W / 800 W / 1200 W / 2000 W). They differ only in output range and chassis size — control, accuracy, protection and interface are otherwise identical. Compare the full series before selecting:
| Rated Power |
40 V |
80 V |
160 V |
250 V |
800 V |
| 400W |
UDP5040-40
0–40A |
UDP5080-20
0–20A |
UDP5160-8
0–8A |
UDP5250-6
0–6A |
UDP5800-2
0–2A |
| 800W |
UDP5040-80
0–80A |
UDP5080-40
0–40A |
UDP5160-16
0–16A |
UDP5250-12
0–12A |
UDP5800-4
0–4A |
| 1200W |
UDP5040-120
0–120A |
UDP5080-60
0–60A |
UDP5160-24
0–24A |
UDP5250-18
0–18A |
UDP5800-6
0–6A |
| 2000W |
UDP5040-200
0–200A |
UDP5080-100
0–100A |
UDP5160-40
0–40A |
UDP5250-30
0–30A |
UDP5800-10
0–10A |
Every model shares the same chassis architecture, control system, regulation accuracy, protection suite, and interface set. The 800 V UDP5800 tier does not support series connection; all other tiers support series and parallel combining. Choose by the voltage class that covers your rail and the power class that covers your load — output range and chassis height scale with power, the instrument does not change.
- 400W / 0–40V / 0–40A — auto-ranging across the rated power envelope
- Voltage accuracy ±(0.05% of set + 0.05% of rated); current accuracy ±(0.5% of set + 0.1% of rated)
- Low ripple — 50mV p-p voltage, 80mA rms current (20 MHz BW)
- CC/CV priority slope modes — choose voltage-first or current-first turn-on for DUT safety
- Adjustable internal resistance to 1.000Ω — emulate batteries, fuel cells and solar sources
- List Mode — 128 programmable V/I/dwell steps, 1 to 9,999, infinite cycles, stand-alone
- Front and rear output terminals (front limited to 10 A)
- Multi-unit series/parallel — up to 4 parallel / 4 series
- USB + LAN with full SCPI 1999.0 / IEEE-488.2; 2.4-inch TFT-LCD
- Discharge-load control for rapid output bleed-down
CC/CV Priority: Protect the Device, Not Just the Supply
Most bench supplies treat the CC/CV crossover as a fixed hardware behaviour. The UDP5000 lets you choose which parameter takes priority at turn-on and during mode transitions. CV-priority establishes the target voltage first — the right choice for microcontrollers, FPGAs and analog rails. CC-priority brings current up under control — the safer choice for LEDs, laser diodes and battery charging where inrush must be bounded.
Adjustable Slew Rate: Control How Fast Power Arrives
Internal Resistance: Simulate Real Power Sources
The internal variable-resistance function (set in CV mode, up to 1.000Ω in 1 mΩ steps) makes the terminal voltage droop with load current exactly as a battery, fuel cell or solar panel would — no physical resistor, no thermal risk, value changeable instantly from the panel or over SCPI.
Front & Rear Outputs: Bench-Ready and Rack-Ready
Output terminals are provided on both panels. Front terminals are there for quick prototype hookup; rear terminals keep permanent rack wiring clean. Both are the same single output — front-panel draw is limited to 10 A, so high-current loads belong on the rear.
List Mode & Discharge Control: Automate Output Sequences
List Mode runs up to 128 programmed V/I/dwell steps for 1 to 9,999, infinite cycles or continuously, stored locally or exported, executing with no PC attached — built for overnight burn-in, charge-profile runs and production routines. The internal discharge load bleeds output capacitance down rapidly when output is switched off.Voltage and current slew rates are independently settable. A slower ramp prevents inrush into capacitive loads, reduces mechanical stress on motor windings at start-up and gives sensitive analog circuits time to settle; the high-speed default mode is there when fast settling is what the test needs.
Multi-Unit Operation: Scale When You Need More
Up to 4 identical units parallel for more current, or up to 4 series for more voltage, coordinated over the rear CAN / LS_BUS interface from the master unit or a single SCPI connection; unit-to-unit balance stays within ~5% of rated.
Display and Control
A 2.4-inch TFT-LCD presents voltage, current and power simultaneously with a concise multifunction keypad; external analog control (0–10 V setpoint plus digital ON/OFF) is available on the rear analog interface for closed-loop and HIL setups.
Applications
Battery and Energy-Storage Test
The wide 0–40 V range covers 12 V to 36 V lithium-ion and LFP packs used in e-bike, power-tool and light-EV work. Internal-resistance emulation and List Mode let you reproduce charge profiles and varying pack states without cycling real cells.
New-Energy and Automotive Electronics
DC/DC converter input stages, inverter front ends and sub-40 V automotive ECUs benefit from the tight regulation, low ripple and CC/CV priority control.
Automated Test and Production
SCPI over USB or LAN plus stored List Mode sequences make the UDP5000 a clean fit for unattended characterisation, burn-in and end-of-line test.
