Page 28 of 85 Operation
Dielectric Absorption: The physical phenomenon in which insulation appears to absorb
and retain an electrical charge slowly over time. Apply a voltage
to a capacitor for an extended period of time. Then quickly
discharge it to zero voltage. Leave the capacitor open circuited
for a period of time then connect a voltmeter to it and measure the
residual voltage. The residual voltage is caused by the dielectric
absorption of the capacitor.
Dielectric Strength: The ratio between the voltage at which breakdown of the insulating
material occurs and the distance between the two points subject to
the applied voltage.
Dielectric Withstand Test: This is the most common electrical safety test performed. A high
voltage (either AC or DC) is applied to determine if a breakdown
will occur in the insulation of the DUT. Dielectric Withstand is
also referred to as a hipot (high potential) test.
Discharge: The act of draining off an electrical charge to ground. Devices that
retain charge should be discharged after an IR test or DC hipot test.
DUT: Device Under Test. (i.e. the product being tested).
Frequency: The rate at which current or voltage reverses polarity and then
back again completing a full cycle, measured in Hertz (Hz) or
cycles/second. AC Line Frequency = 50/60 Hz.
Ground:
Ground: The base reference from which voltages are measured, nominally
the same potential as the earth. Ground is also the side of a circuit
that is at the same potential as the base reference.
Ground Bond Test: Test to verify that all conductive parts of a product that are
exposed to user contact are connected to the power line ground.
The ground bond test verifies the integrity of the ground
connection using a high current AC signal with current level as
high as 30Amps. Ground bond provides a better simulation of how
a product will perform under an actual fault condition.
Ground Continuity: Test to verify that all conductive parts of a product that are
exposed to user contact are connected to the power line ground.
GC Test normally performed with a low current DC signal that
checks to ensure the ground connection has a resistance of <1Ω.
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