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Siglent SPD4306X Quality

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aarons:
I recently got a siglent SPD4306x to replace a SPD3303 which started randomly turning it's outputs off. I also needed the higher current outputs.

I've been quite happy with it, and it definitely seemed higher quality than the 3303. Earlier today I noticed a bothersome tone in my lab which I traced to the fan on the supply. I figured I'd replace the fan with a noctua fan to solve that problem (fan is ordered, should be an easy job.)

However the first thing I noticed upon opening this supply I thought would be interest to the eevblog community.


Everything else looks pretty good. There isn't even any Siglent Rust, but the fact that someone screwed this down and thought this looked fine to ship does make me worry. I slid 2 small washers in there to reduce that bend. I think that standoff might just be a tiny bit shorter than the others, but I haven't completely disassembled the unit to verify that.

tautech:
 :o
Will report incorrect standoff has been used.

Welcome to the forum.

You can hear the fan at full load in a very recent Defpom vid in the SPD4000X thread:
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5734885/#msg5734885

Expecting a Defpom teardown soon....

Martin72:
Ouch,
Especially with SMD assemblies, such mechanical tension is very unwelcome.
Hopefully just a “Monday device”.

aarons:
The noise I was noticing wasn't normal fan noise. It was more like some sort of resonance that ended up sounding like a slight tone in the 1000-1200Hz range, and it was happening at the idle/no-load fan speed. Not a big deal, and overall this 4306X is a huge upgrade over the 3303 in every way.

tautech:

--- Quote from: aarons on December 03, 2024, 08:46:40 pm ---I recently got a siglent SPD4306x to replace a SPD3303 which started randomly turning it's outputs off.

--- End quote ---
Which exact model ?
C, X-E or X ?

The restart issue is a known failure of a 2A bridge on the Control PCB and a fairly simple fix.
You can find several posts about various solutions.

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