Teledyne 703E 用户手册

  I didn’t feel a shock so there was no electro-static discharge: The human nervous system is not able 

to feel a static discharge of less than 3500 volts.  Most devices are damaged by discharge levels much 
lower than that. 

  I didn’t touch it so there was no electro-static discharge:  Electro Static charges are fields whose 

lines of force can extend several inches or sometimes even feet away from the surface bearing the 
charge. 

  It still works so there was no damage: Sometimes the damaged caused by electro-static discharge can 

completely sever a circuit trace causing the device to fail immediately.  More likely, the trace will be only 
partially occluded by the damage causing degraded performance of the device or worse, weakening the 
trace.  This weakened circuit may seem to function fine for a short time, but even the very low voltage 
and current levels of the device’s normal operating levels will eat away at the defect over time causing 
the device to fail well before its designed lifetime is reached.   
These latent failures are often the most costly since the failure of the equipment in which the damaged 
device is installed causes down time, lost data, lost productivity, as well as possible failure and damage 
to other pieces of equipment or property. 

  Static Charges can’t build up on a conductive surface:  There are two errors in this statement.   

Conductive devices can build static charges if they are not grounded.  The charge will be equalized 
across the entire device, but without access to earth ground, they are still trapped and can still build to 
high enough levels to cause damage when discharged. 

A charge can be induced onto the conductive surface and/or discharge triggered in the presence of a 
charged field such as a large static charge clinging to the surface of a nylon jacket of someone walking 
up to a workbench. 

  As long as my analyzer is properly installed, it is safe from damage caused by static discharges:  

It is true that when properly installed the chassis ground of your analyzer is tied to earth ground and its 
electronic components are prevented from building static electric charges themselves.  This does not 
prevent discharges from static fields built up on other things, like you and your clothing, from discharging 
through the instrument and damaging it.   

   

It is impossible to stop the creation of instantaneous static electric charges.  It is not, however difficult to prevent 
those charges from building to dangerous levels or prevent damage due to electro-static discharge from 
occurring. 

Only handle or work on all electronic assemblies at a properly set up ESD station.  Setting up an ESD safe 
workstation need not be complicated.  A protective mat properly tied to ground and a wrist strap are all that is 
needed to create a basic anti-ESD workstation.   

 

Wrist Stra

Protective Mat

Ground Point