Siglent SDL1020X-E
A programmable load with every interface built in, for labs that automate power-supply and battery tests.
Amazon $574$574
The Siglent SDL1020X-E is the better bench power supply overall, rated 4.0 to 3.8. The Siglent SDL1020X-E leads on output quality and PC control. The Rigol DL3021 costs $25 less ($549 vs $574).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Rigol DL3021
A well-supported programmable load for testing power supplies and batteries in an electronics lab.
Amazon $549$549
Which should you buy?
- Choose the Siglent SDL1020X-E for output quality (25 kHz dynamic mode vs 15 kHz dynamic mode) and PC control (USB, RS232, LAN with SCPI vs USB, RS232 with SCPI).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every electronic loads bench power supply; a clear win is highlighted. How we rank explains each one.
| Factor weight | Siglent SDL1020X-E | Rigol DL3021 |
|---|---|---|
| Overall rating | 4.0/5 | 3.8/5 |
| Value 25% | 16 $2.87 per watt ($574, 200 W rated) | 17 $2.75 per watt ($549, 200 W rated) |
| Output quality 20% | 95 25 kHz dynamic mode | 80 15 kHz dynamic mode |
| Resolution 15% | 75 1 mV / 1 mA setting resolution | 75 1 mV / 1 mA setting resolution |
| PC control 15% | 100 USB, RS232, LAN with SCPI | 80 USB, RS232 with SCPI |
| Protection & features 10% | 80 over-voltage protection, over-current protection, remote sense | 80 over-voltage protection, over-current protection, remote sense |
| Warranty 15% | 100 3-year warranty | 100 3-year warranty |
Specifications
| Siglent SDL1020X-E | Rigol DL3021 | |
|---|---|---|
| Output | ||
| Type | Electronic load | Electronic load |
| Channels | 1 | 1 |
| Channel ratings | 150 V/30 A, 200 W | 150 V/40 A, 200 W |
| Max voltage | 150 V | 150 V |
| Max current | 30 A | 40 A |
| Rated power | 200 W | 200 W |
| Dynamic mode | 25 kHz | 15 kHz |
| Load modes | CC, CV, CR, CP | CC, CV, CR, CP |
| Precision | ||
| Setting resolution | 1 mV / 1 mA | 1 mV / 1 mA |
| Readback resolution | 1 mV / 1 mA | 1 mV / 1 mA |
| Remote sense | Yes | Yes |
| Control | ||
| PC interfaces | USB, RS232, LAN, analog remote | USB, RS232 |
| SCPI | Yes | Yes |
| Over-voltage protection | Yes | Yes |
| Over-current protection | Yes | Yes |
| Build | ||
| Weight | 12.8 lb | 16.7 lb |
| Warranty | 3 years | 3 years |