Electrostatic discharge (ESD) can destroy or damage many electronic components, including integrated circuits (ICs) and discrete semiconductor devices. Since certain devices are more susceptible to ESD damage than others, warning symbols, shown in figure 3-1, are now used to identify ESD-sensitive (ESDS) items. The widespread use of integrated circuits led to the development of special training courses in miniature/micro miniature (2M) circuit repair.

Certified 2M technicians are trained in procedures for reducing the causes of ESD damage. The procedures are similar for all levels of maintenance. If you are certified in 2M repair, you should follow the protective measures in table 3-6 to help prevent ESD damage. Remember, although many sources of electrostatic charge are of little consequence during most daily activities, they become extremely important when you work with ESD material. If you are not certified in 2M repair, do not attempt to repair any of these circuits.

For further information on handling ESD materials, refer to Introduction to Microelectronics, Navy Electricity and Electronic Training Series (NEETS), Module 14, NAVEDTRA 172-14-00-84.

Q3. What is the FIRST step in taking voltage measurements below 300 volts?

Q4.     What is the major difference between using a test probe to measure a voltage above 300 volts and using it to measure a voltage of 300 volts or less?

Q5.     What dangerous effect to electronic components are EDS precautions designed to reduce or eliminate?

ELECTROMAGNETIC RADIATION HAZARDS

The electromagnetic spectrum encompasses everyday uses from commercial power to medical

Table 3-5.-Safety Precautions For Measuring Voltages Above 300 Volts

Figure 3-1.-ESD warning symbols.

x-rays as shown in figure 3-2. You will be concerned primarily with radio frequency (RF) and laser hazards.