UNI-T UDP4303S vs Rigol DP2031

More Channels, More Power, More Precision — for $200 More

Get a 4th fully isolated channel, 75W more power, 1 µA current resolution, 8 kSa/s waveform sampling, a controllable bleeder circuit, and a 5-year warranty — all features the DP2031 doesn't offer — for just $200 more.

The UNI-T UDP4303S is a 4-channel, 297W precision linear DC power supply that delivers more capability than the Rigol DP2031 at a comparable price point. For engineers who need an extra channel, higher power, and precision current measurement across all channels, the UDP4303S provides measurably more instrument for just $200 more — and includes a 5-year warranty (vs Rigol's 3-year).

Where the UDP4303S Pulls Ahead

Why Choose UNI-T UDP4303S Over Rigol DP2031?

A 4th Fully Isolated Channel

The UDP4303S provides four fully isolated channels (32V/3A, 32V/3A, 15V/3A, 6V/10A) compared to the DP2031's three (32V/3A, 32V/3A, 6V/5A). That 4th channel means you can power a complete multi-rail embedded design — digital core, analog front-end, I/O rail, and sensor power — from a single instrument. With the DP2031, you'd need to reconfigure or add a second supply.

75W More Power with a Higher-Voltage 3rd Channel

The UDP4303S delivers 297W total vs the DP2031's 222W — a 34% increase. The 3rd channel runs up to 15V/3A (vs Rigol's 6V/5A), giving you the voltage range for 12V rail testing, sensor excitation circuits, and industrial I/O applications without using up your 32V main channels.

1 µA Resolution on All Four Channels

Both supplies offer 1 µA low-current resolution, but the DP2031 limits this to CH1 and CH2 only. The UDP4303S provides 1 µA measurement across all four channels — every output can measure sleep-mode current draw, standby leakage, and IoT sensor consumption without restrictions.

8 kSa/s Waveform Sampling — Standard, Not Optional

The UDP4303S includes 8 kSa/s high-speed sampling across all four channels as standard. The DP2031 offers 7.5 kSa/s as a paid optional upgrade. The UDP4303S's built-in waveform display shows voltage, current, and power transients in real time — you can observe inrush currents and load steps without connecting an oscilloscope.

Controllable Bleeder Circuit

The UDP4303S features a controllable bleeder circuit that the DP2031 lacks entirely. With the bleeder on, output voltage drops to zero rapidly when a channel is disabled — preventing residual voltage from reaching sensitive DUTs. Turn it off for battery testing so the supply doesn't drain the battery when output is disabled. This dual-mode flexibility is essential for labs doing both powered-circuit development and battery characterization.

Sense Protection on All Channels

Both supplies support 4-wire remote sensing, but the UDP4303S adds sense line protection on all four channels — guarding against reverse connection and overvoltage on the sense terminals. The DP2031 does not offer sense protection, leaving your instrument's sense inputs vulnerable to wiring errors.

Delayer & Monitor — Exclusive to UDP4303S

The UDP4303S includes both a delayer function (programmable channel on/off sequencing with up to 512 steps at 1 ms resolution) and a monitor function (configurable voltage/current/power condition monitoring with audible/visual alerts and auto-shutdown). Neither function is available on the DP2031.

Configurable OCP with <3 ms Response

The UDP4303S offers adjustable OCP protection timing directly from the front panel (0–10 seconds) with the fastest response under 3 ms. A "Setting Change" mode prevents false OCP triggers during power-on inrush. The DP2031's OCP timing is configurable only through PC software (0–1000 ms range), with no front-panel control.

5-Year Warranty vs 3-Year

The UDP4303S ships with a 3+2 warranty — 3 years standard, plus 2 additional years with free online registration at uni-trendus.com. The DP2031 includes a standard 3-year warranty with no extended option.

Full Specification Comparison

Specification	UNI-T UDP4303S	Rigol DP2031
Channels	4 fully isolated	3 fully isolated
Output Voltage	32V, 32V, 15V, 6V	32V, 32V, 6V
Output Current	3A, 3A, 3A, 10A	3A, 3A, 5A (opt: 2A, 2A, 10A)
Total Power	297W	222W
Load Regulation (V)	≤0.01% + 2 mV	≤0.01% + 2 mV
Load Regulation (I)	≤0.01% + 250 µA	≤0.01% + 250 µA
Ripple & Noise	<350 µVrms / 2 mVpp	<350 µVrms / 2 mVpp
Programming Accuracy (V)	±(0.03% + 8 mV)	±(0.03% + 8 mV)
Programming Accuracy (I)	±(0.15% + 5 mA)	±(0.15% + 5 mA)
Readback Accuracy (V)	±(0.03% + 8 mV)	±(0.05% + 8 mV)
Readback Resolution (V)	1 mV	1 mV (device), 0.1 mV (PC)
Readback Resolution (I)	0.1 mA (1 µA low-current, all CH)	0.1 mA (1 µA low-current, CH1-CH2 only)
Current Sampling Rate	8 kSa/s (standard)	7.5 kSa/s (optional upgrade)
Programming Time Resolution	1 ms	1 ms
Command Processing	<10 ms	<10 ms
Transient Response	<50 µs	<50 µs
Series Mode	Up to 64V (CH1+CH2)	Up to 64V (CH1+CH2)
Parallel Mode	Up to 6A (CH1+CH2)	Up to 6A (CH1+CH2)
Bleeder Circuit	Yes (controllable)	No
Sense Protection	Yes (all channels)	No
OCP Protection Time	0–10s (front panel, <3 ms fastest)	0–1000 ms (PC software only)
Delayer Function	Yes (512 steps)	No
Monitor Function	Yes	No
Waveform Display	Yes	Yes
List Mode	Yes (512 groups)	Yes (512 groups)
Display	4.3-inch LCD	4.3-inch touch LCD
Interfaces	RS-232, USB Host, USB Device, LAN, Digital I/O, Sense	RS-232, USB Host, USB Device, LAN, Digital I/O, Sense
Web Control	Yes	Yes
Dimensions (W×H×D)	225 × 160 × 445 mm	239 × 157 × 419 mm
Weight	10.5 kg	9.95 kg
Warranty	5 years (3+2 with registration)	3 years
Price	$1,399	$1,199

Frequently Asked Questions

Is the $200 price difference worth it?

For $200 more, you get: a 4th fully isolated channel, 75W more total power, a 15V/3A channel (vs 6V), 1 µA current resolution on all channels (vs only 2), standard 8 kSa/s sampling (vs optional on Rigol), a controllable bleeder circuit, sense protection, delayer and monitor functions, and 2 extra years of warranty. Any one of these features would justify $200; together, they represent a significant upgrade.

I mostly need 32V channels — does the extra 15V channel matter?

The 15V/3A channel is more versatile than you might expect. It covers 12V rail testing, 5V-to-15V sensor excitation, gate driver supplies, and industrial I/O applications — all without using one of your 32V main channels. With the DP2031, you'd use a 32V channel for these lower-voltage tasks, leaving you with fewer channels for your primary work.

The DP2031 has a touchscreen — does the UDP4303S?

The UDP4303S uses a 4.3-inch color LCD with physical buttons, numeric keypad, and rotary encoder. It does not have a touchscreen. For bench power supplies where you're often wearing gloves or working with both hands, many engineers prefer physical controls. The UDP4303S's 6 display styles and soft-key menu navigation provide fast, precise control.

What's included with the UDP4303S?

The UDP4303S ships with the instrument, power cord, USB data cable, 5-pin plug (3.81mm), two 8-pin plugs (5.08mm), and factory calibration report. Register online at uni-trendus.com to extend the 3-year standard warranty to a full 5 years at no additional cost.

Explore UNI-T Power Supplies

Looking for different specifications? Check out our complete range of DC power supplies:

• UDP3305S: 4Ch 328W Performance-Series — higher power with 30V/5A channels
• UDP3305S-E: 4Ch 328W Advanced-Series — affordable 4-channel linear
• UDP3305C: 3Ch 315W Advanced-Series — 3-channel alternative

Visit our DC Power Supplies collection to see all available models, including switching supplies up to 600W.

Ready to Upgrade Your Bench Power?

The UNI-T UDP4303S delivers more channels, more power, and more precision than the Rigol DP2031 — for just $200 more.

Includes 3+2 Year Warranty & Free Technical Support

Register at uni-trendus.com/pages/uni-trend-product-registration to extend your 3-year standard warranty to a full 5 years at no extra cost!