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Operation 150821/A4 Page 25 of 110

Equivalent Circuit: The configuration of the device under test. Is it a series or parallel

equivalent circuit?

IMPEDANCE ADMITTANCE

InductiveCapacitive InductiveCapacitive

or or

DUT

Series Parallel

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: 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.

Impedance: The AC resistance of the DUT. Impedance (Z) is a vector

summation of resistance R and reactance X.

For capacitors reactance is defined as XC = 1/jωC

For inductors reactance is defined as XL = jωL

For resistors resistance is defined as R

Impedance is defined as Z = √(X2 + R2)

Inductor: Abbreviated L (as in LCR). An inductor is a coil of wire. It is used

to create electromagnetic induction in a circuit.

Inductance: The property of a coil to oppose any change in current through it.

If the turns (coils) of the wire are stretched out, the field intensity

will be less and the inductance will be less. Unit of measure is the

Henry (H).

Inductive Reactance: A measure of how much the counter electro-magnetic force (emf)

of the coil will oppose current variation through the coil. The

amount of reactance is directly proportional to the current

variation: X

= 2πfL.

QuadTech 1730T User Manual

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