UNI-T UDP4303S vs Keysight E36313A

More Power, More Precision, Nearly Half the Price

Get 86% more power, an extra channel, 8 kSa/s waveform sampling, 1 µA current resolution, a controllable bleeder circuit, and a 5-year warranty — all at 48% less than the Keysight E36313A.

The UNI-T UDP4303S is a 4-channel, 297W precision linear DC power supply that delivers significantly more power, more channels, and more measurement capability than the Keysight E36313A — at nearly half the price. For engineers who need clean linear output without paying the Keysight premium, the UDP4303S provides equivalent or better specifications on virtually every metric that matters.

Where the UDP4303S Outperforms

Why Choose UNI-T UDP4303S Over Keysight E36313A?

86% More Power, 4 Channels vs 3

The UDP4303S delivers 297W across four fully isolated channels, while the E36313A provides just 160W across three. That's 86% more total power. The UDP4303S's channel configuration (32V/3A, 32V/3A, 15V/3A, 6V/10A) gives you two high-voltage channels, a mid-voltage channel for 12V/5V rails, and a high-current low-voltage channel — all from a single instrument. The E36313A's 25V/2A main channels limit you to 2A maximum on the higher-voltage outputs.

8 kSa/s Waveform Display — Something Keysight Doesn't Offer

The UDP4303S includes a built-in waveform display sampling at 8 kSa/s across all four channels. You can observe voltage, current, and power transients in real time — inrush currents, load steps, and power-up sequences — directly on the instrument's 4.3-inch LCD. The E36313A does not offer waveform sampling or display at any level. For power behavior analysis, the UDP4303S eliminates the need for a separate oscilloscope in many scenarios.

10× Faster Programming Resolution

The UDP4303S achieves 1 ms programming time resolution with 512-group list output and built-in waveform templates. The E36313A's LIST mode operates at 10 ms resolution — 10× slower. For applications requiring precise arbitrary waveform generation, battery charge profile simulation, or fast automated test sequences, this is a significant performance advantage.

1 µA vs 2 µA Low-Current Resolution

The UDP4303S resolves current down to 1 µA in low-current mode across all four channels. The E36313A reaches 2 µA. For IoT device characterization, battery drain analysis, and sensor sleep-mode testing, the UDP4303S provides finer measurement granularity on every channel.

Lower Ripple on Voltage Output

The UDP4303S specifies output ripple at <350 µVrms / 2 mVpp, while the E36313A specifies <1 mVrms / 5 mVpp on its higher-current channel. The UDP4303S delivers nearly 3× lower voltage ripple — a measurable advantage for noise-sensitive analog and mixed-signal circuits.

Controllable Bleeder Circuit

The UDP4303S features a controllable bleeder circuit not available on the E36313A. With the bleeder on, output voltage drops to zero rapidly when a channel is disabled. Turn it off for battery testing to prevent the supply from draining the battery. This dual-mode flexibility supports both powered-circuit development and battery characterization workflows.

Monitor & Delayer Functions — Exclusive to UDP4303S

The UDP4303S includes a monitor function (configurable voltage/current/power condition monitoring with auto-shutdown and alerts) and a delayer function (programmable channel on/off sequencing with up to 512 steps). Neither function is available on the E36313A.

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 E36313A does not include sense protection.

5-Year Warranty vs 1-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 Keysight E36313A includes a standard 1-year warranty. Extended coverage from Keysight (KeysightCare) is available but adds to the already-premium price.

Where Keysight Has the Edge

The E36313A does offer some advantages worth noting. Keysight's current programming accuracy is tighter at ±(0.04% + 3 mA) vs the UDP4303S's ±(0.15% + 5 mA). The E36313A supports an optional GPIB interface for legacy test system integration. Keysight also offers BenchVue software for PC-based visualization across multiple instruments in the Keysight ecosystem. For labs already invested in Keysight infrastructure with existing GPIB systems, these factors may be relevant — but at nearly double the price.

Full Specification Comparison

Specification	UNI-T UDP4303S	Keysight E36313A
Channels	4 fully isolated	3 fully isolated
Output Voltage	32V, 32V, 15V, 6V	6V, 25V, 25V
Output Current	3A, 3A, 3A, 10A	10A, 2A, 2A
Total Power	297W	160W
Load Regulation (V)	≤0.01% + 2 mV	≤0.01% + 4 mV
Load Regulation (I)	≤0.01% + 250 µA	≤0.01% + 500 µA
Ripple & Noise (V)	<350 µVrms / 2 mVpp	<350 µVrms–1 mVrms / 2–5 mVpp
Programming Accuracy (V)	±(0.03% + 8 mV)	±(0.03% + 5 mV)
Programming Accuracy (I)	±(0.15% + 5 mA)	±(0.04% + 3 mA)
Readback Accuracy (V)	±(0.03% + 8 mV)	±(0.03% + 5 mV)
Readback Accuracy (I)	±(0.15% + 5 mA)	±(0.04% + 3 mA)
Readback Resolution (I)	0.1 mA (1 µA low-current)	160 µA (2 µA low-current)
Current Sampling Rate	8 kSa/s	N/A
Waveform Display	Yes (V, I, W on all channels)	No
Programming Time Resolution	1 ms	10 ms
List Mode	Yes (512 groups)	Yes
Command Processing	<10 ms	<10 ms
Transient Response	<50 µs	<50 µs
Series Mode	Up to 64V	Up to 50V
Parallel Mode	Up to 6A	Up to 4A
Bleeder Circuit	Yes (controllable)	No
Sense Protection	Yes (all channels)	No
OCP Protection Time	0–10s (<3 ms fastest)	0–3600s
Delayer Function	Yes (512 steps)	No (sequencing only)
Monitor Function	Yes	No
Data Logging	Recorder (USB export)	Yes (built-in)
Display	4.3-inch LCD	4.3-inch LCD
Interfaces	RS-232, USB Host/Device, LAN, Digital I/O, Sense	USB, LAN, GPIB (optional), Digital I/O, Sense
Web Control	Yes	Yes
GPIB	No	Optional
Dimensions (W×H×D)	225 × 160 × 445 mm	216 × 145 × 367 mm
Weight	10.5 kg	9.8 kg
Warranty	5 years (3+2 with registration)	1 year standard
Price	$1,399	$2,680

Frequently Asked Questions

Is Keysight's current accuracy really better?

Yes — the E36313A's current programming and readback accuracy (±0.04% + 3 mA) is tighter than the UDP4303S's (±0.15% + 5 mA). If your application requires the tightest possible current accuracy on the source side, this is worth noting. However, the UDP4303S's 1 µA readback resolution provides finer measurement granularity than the E36313A's 2 µA, which matters more for measuring what the load is actually drawing.

I use GPIB in my test system — is that a dealbreaker?

The UDP4303S does not support GPIB. If your existing automated test system requires GPIB connectivity and cannot be adapted to use USB, LAN, or RS-232, the E36313A (with the optional GPIB module) is the better fit. However, most modern test systems have moved to LAN/USB, and the UDP4303S's SCPI implementation is fully compatible with standard test frameworks over these interfaces.

Does the UDP4303S work with Keysight BenchVue?

No — BenchVue is a Keysight-proprietary software ecosystem. The UDP4303S uses standard SCPI commands over USB, LAN, and RS-232, and includes a built-in web server for browser-based control. For multi-instrument control, the UDP4303S integrates with any SCPI-compatible test automation software.

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 Save Over $1,200 on Your Next Bench Supply?

The UNI-T UDP4303S delivers more power, more channels, and more measurement capability than the Keysight E36313A — at 48% less cost.

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!