IET Labs DE-5000 - Introduction to Measuring Principles; What Is Impedance

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To accommodate various test requirements, the DE-5000 offers
selectable test frequencies: 100 Hz / 120 Hz / 1 kHz / 10 kHz /
100 kHz.
The unit is powered by a standard 9V battery. For additional
convenience, it may also use an optional ac adapter
(DE-5000-AC).
To transfer data to a PC, the unit comes with a built-in IR
interface. IET offers an optional Data Transfer Kit
(DE-5000-DTK). This kit includes: IR-USB interface adapter,
a USB cable, and a CD with software for the PC.
1.2. Introduction to measuring principles
1.2.1. What is impedance
Impedance (
Z
) consists of resistance (real part) and reactance
(imaginary part). Series impedance (
Zs
) can be defined as a
combination of series resistance (
Rs
) and series reactance (
Xs
). It
can be represented mathematically as magnitude |
Z
|=√(
Rs
2
+
Xs
2
)
at a phase angle
Θ
.