Siglent SPD1305X
#1 in Single outputFull review
A quiet, precise single-output linear supply for electronics benches that want PC control and remote sense. Less power per dollar than a switcher, but far cleaner output.
Amazon $328$328
The Siglent SPD1305X is the better bench power supply overall, rated 4.0 to 3.1. The Siglent SPD1305X leads on output quality, PC control and warranty. The B&K Precision 1687B wins on value and protection & features. The Siglent SPD1305X costs $80 less ($328 vs $408).
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.
B&K Precision 1687B
#7 in Single outputFull review
A durable name-brand switching supply for service benches and 24 V equipment, with a warranty the import brands do not offer.
Amazon $408$408
Which should you buy?
- Choose the Siglent SPD1305X for output quality (0.3 mVrms ripple and noise vs 5 mVrms ripple and noise), PC control (USB, LAN with SCPI vs USB) and warranty (3-year warranty vs 2-year warranty).
- Choose the B&K Precision 1687B for value ($1.13 per watt ($408, 360 W rated) vs $2.19 per watt ($328, 150 W rated)) and protection & features (over-voltage protection, stored setups vs remote sense, stored setups).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every single output bench power supply; a clear win is highlighted. How we rank explains each one.
| Factor weight | Siglent SPD1305X | B&K Precision 1687B |
|---|---|---|
| Overall rating | 4.0/5 | 3.1/5 |
| Value 25% | 24 $2.19 per watt ($328, 150 W rated) | 42 $1.13 per watt ($408, 360 W rated) |
| Output quality 20% | 96 0.3 mVrms ripple and noise | 33 5 mVrms ripple and noise |
| Resolution 15% | 75 1 mV / 1 mA setting resolution | 50 resolution not published (neutral score used) |
| PC control 15% | 100 USB, LAN with SCPI | 50 USB |
| Protection & features 10% | 40 remote sense, stored setups | 50 over-voltage protection, stored setups |
| Warranty 15% | 100 3-year warranty | 50 2-year warranty |
Specifications
| Siglent SPD1305X | B&K Precision 1687B | |
|---|---|---|
| Output | ||
| Type | Power supply | Power supply |
| Regulation | Linear | Switching |
| Channels | 1 | 1 |
| Channel ratings | 30 V/5 A | 1-36 V/10 A |
| Max voltage | 30 V | 36 V |
| Max current | 5 A | 10 A |
| Rated power | 150 W | 360 W |
| Ripple and noise | 0.3 mVrms / 3 mVp-p | 5 mVrms / 50 mVp-p |
| Precision | ||
| Setting resolution | 1 mV / 1 mA | - |
| Readback resolution | 1 mV / 1 mA | - |
| Remote sense | Yes | - |
| Control | ||
| PC interfaces | USB, LAN | USB, analog remote |
| SCPI | Yes | - |
| Stored setups | 5 | 3 |
| Over-voltage protection | - | Yes |
| Build | ||
| Weight | 12.1 lb | 5.2 lb |
| Warranty | 3 years | 2 years |