Electronics > Beginners
Choosing a PSU, what should I look for
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james_s:
I've used fancy programmable power supplies before and found most of them to be lacking in one way or another. I also have no need for computer control, given a choice I'll take old fashioned analog knobs and meters any day.
rdl:
In my mind both Siglent and Rigol have too many drawbacks to work around. I could never have anything from Siglent on my bench knowing it was probably rusting away on the inside. And Rigol with their toy-like, cluttered up front panels just look stupid. I'll stick with my used HP, Agilent, and Tektronix stuff. If I lived in Europe I'd probably be looking for a used TTi or R&S power supply.
Mr. Scram:

--- Quote from: rdl on February 23, 2019, 10:54:41 pm ---In my mind both Siglent and Rigol have too many drawbacks to work around. I could never have anything from Siglent on my bench knowing it was probably rusting away on the inside. And Rigol with their toy-like, cluttered up front panels just look stupid. I'll stick with my used HP, Agilent, and Tektronix stuff. If I lived in Europe I'd probably be looking for a used TTi or R&S power supply.

--- End quote ---
People who buy Siglent or Rigol typically do so because buying HP, Agilent or Tektronix isn't viable. Buying old kit could be doable, but that has its own drawbacks.
james_s:
I've almost exclusively bought used gear and it has worked out very well. The one time I remember I did buy a new Chinese bench DMM I pretty quickly found I hated it, sold it after a few months and bought a used Fluke 45.
tautech:

--- Quote from: rdl on February 23, 2019, 10:54:41 pm ---I could never have anything from Siglent on my bench knowing it was probably rusting away on the inside.

--- End quote ---
That statement implies you're not well read or well educated.

1. Any Siglent panel rust issues have been addressed some years ago and better zinc plated panel steel sourced.
2. Galvanized steel:
 If the zinc coating is scratched or otherwise locally damaged and steel is exposed, the surrounding areas of zinc coating form a galvanic cell with the exposed steel and protect it from corrosion. This is a form of localized cathodic protection - the zinc acts as a sacrificial anode.
https://en.wikipedia.org/wiki/Cathodic_protection
3. If you think Siglent are the only instruments you will find rust in, think again as you're in some dream world.
4. I have a Tek TDS2012B with rusty chassis work but only on the cut edges, this is entirely normal.
5. The galv sheet that forms an instrument chassis is guillotined and punched, these processes shear the zinc plating and expose the parent steel which then starts to rust to a point where a process called Cathodic protection takes over and gives protection of the parent steel.To prove this process works for the non-believer, grind the zinc from a portion of galv steel and leave it in the weather....in will not rust unduly !


Todays educational lesson over.


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