Page 24 of 110 150821/A4 Operation
Capacitance: The measure of the ratio of charge on either plate of a capacitor to
the potential difference (voltage) across the plates. Unit of measure
is the Farad (F).
Capacitive Reactance: A measurement of the actual AC resistance of a capacitor. How
effective a capacitor allows AC to flow depends upon its
capacitance and the frequency used. X
C
= 1 / 2πfC.
Compare: Procedure for sorting components by comparing the measured
value against a known standard.
Current:
AC: Alternating Current. AC is an electrical current that has one
polarity during part of the cycle and the opposing polarity during
the other part of the cycle. Residential electricity is AC.
DC: Direct Current. Non-reversing polarity. The movement of charge
is in one direction. Used to describe both current and voltage.
Batteries supply direct current (DC).
Dielectric: A material which is an electrical insulator or in which an electric
field can be sustained with a minimum dissipation of power.
Dielectric Constant: Abbreviated K, relative dielectric constant. The dielectric constant
of a material is the ratio of the capacitance of a capacitor filled
with a given dielectric to that same capacitor having only a
vacuum as a dielectric.
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).
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