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	See current price →	$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!

Disclaimer: Rigol® is a registered trademark of RIGOL Technologies, Inc. UNI-T® is a registered trademark of Uni-Trend Technology (China) Co., Ltd. The comparison provided is based on publicly available information and is intended for informational purposes only. This comparison is not endorsed by, affiliated with, or sponsored by RIGOL Technologies. All trademarks, product names, and company names mentioned herein are the property of their respective owners.