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Power  Supply  Setup  (fig.  8-17).
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TM-9-254 Gearcase Transfer M548 M548A1 (
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ESD Handling, Labeling and Packaging
TM 9-254 Section IV.  ELECTROSTATIC DISCHARGE (ESD) AWARENESS 8-9. General Information. a. Scope.    It  is  essential  to  understand  the  nature  of  electrostatic  discharge  (ESD),  what  causes  it,  and  the problems it can cause.  This section contains information on the areas of major concern. b. Basic Definitions. (1) Electrostatic Discharge (ESD).  A sudden and rapid transfer of electrons or charge between two objects. An example of ESD is the shock received after walking across a carpet and touching a metallic object, like a door knob. (2) Electrostatic  Discharge  Sensitive  (ESDS)  Items.    All  noninstalled  electronic  components,  circuit  cards and assemblies with sensitive labels.  Items that fall within the Federal Supply Class (FSC) 5905, 5960, 5961, or 5962 should be treated as sensitive unless known to be otherwise. (3) ESD Protective Material.  Conductive, antistatic, and static dissipative are all types of materials that are used to protect against ESD.  Static dissipative materials are preferred because the charge dissipates across the surface at a controlled rate. c. Typical Prime Charge Sources.  Means of generating electrostatic charges (voltage) and their relationship to relative humidity are shown in table 8-7. Table 8-7.  Means of Static Charge Generation and the Associated Voltages MEANS OF STATIC GENERATION ELECTROSTATIC VOLTAGES WITH AND 10 - 20 % 65 - 90 % PERCENTAGE OF RELATIVE HUMIDITY RELATIVE RELATIVE HUMIDITY HUMIDITY WALKING ACROSS CARPET 35,000 1,500 WALKING ON VINYL FLOOR 12,000 250 WORKER AT WORKBENCH 6,000 100 Change 3  8-26

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