Rigol DL3021
A well-supported programmable load for testing power supplies and batteries in an electronics lab.
Amazon $549$549
The Rigol DL3021 rates 3.8 among electronic loads bench power supplys; the GW Instek GPD-3303D rates 2.4 among multi-output ones. The Rigol DL3021 costs $170 less ($549 vs $719).
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.
GW Instek GPD-3303D
#8 in Multi-outputFull review
A triple-output linear supply from a lab brand, outclassed here on price and setting resolution.
Amazon $719$719
Scores side by side
These two sit in different type classes (electronic loads and multi-output), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | Rigol DL3021 | GW Instek GPD-3303D |
|---|---|---|
| Overall rating | 3.8/5 | 2.4/5 |
| Value 25% | 17 $2.75 per watt ($549, 200 W rated) | 9 $3.69 per watt ($719, 195 W rated) |
| Output quality 20% | 80 15 kHz dynamic mode | 71 1 mVrms ripple and noise |
| Resolution 15% | 75 1 mV / 1 mA setting resolution | 0 100 mV / 10 mA setting resolution |
| PC control 15% | 80 USB, RS232 with SCPI | 50 USB |
| Protection & features 10% | 80 over-voltage protection, over-current protection, remote sense | 20 stored setups |
| Warranty 15% | 100 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Rigol DL3021 | GW Instek GPD-3303D | |
|---|---|---|
| Output | ||
| Type | Electronic load | Power supply |
| Regulation | - | Linear |
| Channels | 1 | 3 |
| Channel ratings | 150 V/40 A, 200 W | 30 V/3 A, 30 V/3 A, 2.5/3.3/5 V/3 A |
| Max voltage | 150 V | 30 V |
| Max current | 40 A | 3 A |
| Rated power | 200 W | 195 W |
| Ripple and noise | - | 1 mVrms |
| Dynamic mode | 15 kHz | - |
| Load modes | CC, CV, CR, CP | - |
| Precision | ||
| Setting resolution | 1 mV / 1 mA | 100 mV / 10 mA |
| Readback resolution | 1 mV / 1 mA | 100 mV / 10 mA |
| Remote sense | Yes | - |
| Control | ||
| PC interfaces | USB, RS232 | USB |
| SCPI | Yes | - |
| Stored setups | - | 4 |
| Over-voltage protection | Yes | - |
| Over-current protection | Yes | - |
| Build | ||
| Weight | 16.7 lb | 15.4 lb |
| Warranty | 3 years | - |