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1.2. Safety Symbols
1.2.1. Product Marking Symbols
Product will be marked with this symbol when it is necessary to refer to the
operation and service manual in order to prevent injury or equipment
damage.
Product will be marked with this symbol when hazardous voltages may be
present.
Product will be marked with this symbol at connections that require earth
grounding.
1.2.2. Caution and Warning Symbols
Calls attention to a procedure, practice, or condition that could
possibly cause bodily injury or death.
Calls attention to a procedure, practice, or condition that could
possibly cause damage to equipment or permanent loss of data.
1.3. Glossary of Terms
(As used in this manual)
Alternating Current, AC: Current that reverses direction on a regular basis. Utility power is
usually generated in the form of a sinusoid at a frequency of 60 times per second in the United States
and 50 times per second in other countries.
Arc: A partial momentary breakdown due to the force of a strong electric field on closely spaced
conductors, sometimes evidenced by corona or a luminous flashover.
Breakdown: The failure of insulation to effectively prevent the flow of current. If the test voltage is
gradually raised, breakdown will begin suddenly at a certain voltage level and current flow will not be
directly proportional to voltage. Once a breakdown occurs, especially for a period of time, the next
gradual application of voltage will often cause a breakdown to begin at a lower voltage.
Conductor: A solid or liquid material which permits the flow of electrons. A material which has a
volume resistivity of no more than 10
3
Ω-cm.
Current: The movement of electrons through a conductor. Current is measured in amperes (A),
milliamperes (mA), microamperes (uA). Symbol = I
Dielectric: An insulating material that is positioned between two conductive materials in such a way
that a charge or voltage may appear across the two conductive materials.
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