Electronics > Beginners
Choosing a PSU, what should I look for
Mr. Scram:
--- Quote from: james_s on February 24, 2019, 05:00:30 am ---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.
--- End quote ---
YMMV. One isn't exactly a large sample group.
Mr. Scram:
--- Quote from: tautech on February 24, 2019, 05:16:34 am ---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.
--- End quote ---
The lesson is that you're trying to peddle your kit. ;D Siglent had rust issues other manufacturers don't have, but recent units seem better. It's probably an example of budget conscious manufacturers learning where to cut corners and where not to do so.
tautech:
--- Quote from: Mr. Scram on February 24, 2019, 05:24:47 am ---
--- Quote from: tautech on February 24, 2019, 05:16:34 am ---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.
--- End quote ---
The lesson is that you're trying to peddle your kit. ;D Siglent had rust issues other manufacturers don't have, but recent units seem better. It's probably an example of budget conscious manufacturers learning where to cut corners and where not to do so.
--- End quote ---
::)
You too are not well read.
The original problem arose from a faulty batch of panel steel supplied to the company that made chassis for Siglent.
This has been discussed at length on at least a couple of occasions here over the years.
It is NOT as terminal for an instrument as crook PSU's or FRAM issues that some manufacturers have.
Mr. Scram:
--- Quote from: tautech on February 24, 2019, 05:33:10 am --- ::)
You too are not well read.
The original problem arose from a faulty batch of panel steel supplied to the company that made chassis for Siglent.
This has been discussed at length on at least a couple of occasions here over the years.
It is NOT as terminal for an instrument as crook PSU's or FRAM issues that some manufacturers have.
--- End quote ---
Belittling people who don't buy into the excuses isn't the smartest of moves. Even if there was "a faulty batch" Siglent is solely responsible for the quality of the products it puts out. That's what internal quality control is for. Besides, the problems seem a bit too widespread for it to be a single batch.
Admitting a mistake and showing improvements have been made is fine. Blaming others and downplaying the issue is exactly what people expect from chancy Chinese manufacturers and exactly what they don't need if they want to move up in the world. Own your mistakes and people will respect you for it, like the manufacturer with FRAM issues is doing.
Calvin:
Hi,
as you said ... no manufacturer is perfect.
You can find countless threads and vids about bugs, dodgyness, plain failure, ill design and construction of devices.
And You can tag any name plate on those threads, not just chinese.
Also there is no doubt that modern devices are way not manufactured as solid as old ones.
I assume nobody expects actual Tektronix/KS/Fluke/R&S/etc. devices to last 40years+ ... especially not their´budget lines´
Siglent has certainly done a great job with their X-series devices ... very capable devices, of course built to a price ad yes with some bugs at the beginning .... but then, why buy a A-Brand device with an hefty premium if its not proportionally better, or longer living, less buggy, or gives more reliable measurements?
As several threads hint Siglent seems ´listening´ to what users critizise about and the bugfix and improvement update rate is above average.
I regard this as confidence generating behaviour .... they care about their products.
regards
Calvin
ps. to not give food to the impression of A-Brand bashing, here´s a 3-channel power supply where I find the layout of the front face simply excellent.
With 33 buttons 2 knobs, a power button and similar face area it almost equals the Rigol DP832A .... but whoaaah what a difference!!
btw. Welectron offers those ´on sale´ at the time for ~10% less.
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