Difference between revisions of "Common symbols around you"

From Helpful
Jump to: navigation, search
m (Certifications)
m (Certifications)
Line 74: Line 74:
 
<br style="clear:both">[[File:Bunch on european certifications.png|thumb|right|Bunch on european certifications]]  
 
<br style="clear:both">[[File:Bunch on european certifications.png|thumb|right|Bunch on european certifications]]  
 
You'll note that some of them are country-specific. There are many more country-specific testing centers.
 
You'll note that some of them are country-specific. There are many more country-specific testing centers.
 +
and may deal with additional health and/or safety and/or environmental concerns.
 
You're probably used to the ones applying to your part of the world.
 
You're probably used to the ones applying to your part of the world.
  
Line 80: Line 81:
  
  
For things like power supplies it's not uncommon to see a bunch more certifications,
+
For things like power supplies it's not uncommon to see ''many'' certification marks,
e.g. when a large company that has locked down the design so that they can mass produce
+
for practical reasons: e.g. when a large company that has locked down the design so that they can mass produce it,
it for worldwide sale without a lot of new certification.
+
for worldwide sale, without a lot of new certification (certifcation is slow and sort of expensive).
  
  
<br style="clear:both">[[File:CE and CE.png|thumb|69px|right|CE Mark and Chinese Export]] There are also a bunch of fake symbols, like the "chinese export", the latter being a nickname of chinese producers stamping CE (european) mark.
+
<br style="clear:both">[[File:CE and CE.png|thumb|69px|right|CE Mark and Chinese Export]] There are also a bunch of fake symbols.
Often with different, tighter spacing (though some real CE products sometimes do this too for spacing reasons).
+
Best known among them is the "chinese export", a nickname of chinese producers stamping the european CE mark.
 +
Often with different, tighter spacing {{comment|(though some real CE products sometimes do this too for spacing reasons)}}.
  
 
<br style="clear:both">
 
<br style="clear:both">

Revision as of 15:03, 9 November 2019


Uses, safety




Power supply


basic DC adapter specs

The top symbol is for DC barrel plugs, specifying whether the inside or outside is positie.

The middle line is input, where the squiggly tilde ~ indicates AC.

The third line (output)'s solid and dotted line indicates DC.





Transformer (general)

isolating, safety isolating; non-short-circuit proof, short-circuit proof

separating transformer, output >1kV, variable, constant voltage, perturbation attenuating

Double circle, like a vertical venn diagram, are transformers, with a handful of properties marked. There are more combinations of all the parts this image shows, and further ones (e.g. construction site).



Certifications

Some of the more commonly seen logos / certification bodies include:


Bunch on european certifications

You'll note that some of them are country-specific. There are many more country-specific testing centers. and may deal with additional health and/or safety and/or environmental concerns. You're probably used to the ones applying to your part of the world.

In most places these are not required for sale, but for both safety and insurance reasons they are a good idea for both you and retailers.


For things like power supplies it's not uncommon to see many certification marks, for practical reasons: e.g. when a large company that has locked down the design so that they can mass produce it, for worldwide sale, without a lot of new certification (certifcation is slow and sort of expensive).



CE Mark and Chinese Export
There are also a bunch of fake symbols.

Best known among them is the "chinese export", a nickname of chinese producers stamping the european CE mark. Often with different, tighter spacing (though some real CE products sometimes do this too for spacing reasons).


Related

A bunch of the above are settled in ISO 7000 / IEC 60417, which also have a lot of markings used around mechanisms, indicatons, and buttons, around cars, audio, production lines.

See https://www.iso.org/obp/ui#iso:pub:PUB400008:en


IP ratings for water and object safety


clothing / washing labels

Unsorted

https://hackaday.com/2018/02/02/what-are-those-hieroglyphics-on-your-laptop-charger/


Single use, keep dry, don't use if package damaged

Consumables