Teledyne t320u Manual Do Utilizador

Página de 426
 
325 
 
14. 
A PRIMER ON ELECTRO-STATIC DISCHARGE 
Teledyne API considers the prevention of damage caused by the discharge of static 
electricity to be extremely important part of making sure that your analyzer continues to 
provide reliable service for a long time.  This section describes how static electricity 
occurs, why it is so dangerous to electronic components and assemblies as well as how 
to prevent that damage from occurring. 
14.1. HOW STATIC CHARGES ARE CREATED 
Modern electronic devices such as the types used in the various electronic assemblies of 
your analyzer, are very small, require very little power and operate very quickly.  
Unfortunately, the same characteristics that allow them to do these things also make 
them very susceptible to damage from the discharge of static electricity.  Controlling 
electrostatic discharge begins with understanding how electro-static charges occur in the 
first place. 
Static electricity is the result of something called triboelectric charging which happens 
whenever the atoms of the surface layers of two materials rub against each other.  As the 
atoms of the two surfaces move together and separate, some electrons from one surface 
are retained by the other.   
 
+
 
+
 
Materials 
Makes 
Contact 
P
ROTONS 
=
 
E
LECTRONS 
=
 
N
ET 
C
HARGE 
=
 
P
ROTONS 
=
 
E
LECTRONS 
=
 
N
ET 
C
HARGE 
=
 
Materials 
Separate 
+
P
ROTONS 
=
 
3
E
LECTRONS 
=
 
N
ET 
C
HARGE 
=
 
-1 
+
P
ROTONS 
=
 
3
E
LECTRONS 
=
 
N
ET 
C
HARGE 
=
 
+1 
 
Figure 14-1: 
Triboelectric Charging 
If one of the surfaces is a poor conductor or even a good conductor that is not grounded, 
the resulting positive or negative charge cannot bleed off and becomes trapped in place, 
06864B DCN6314