  Dielectric spectroscopy is one of the most commonly used techniques for the
investigation of the dynamic response of glass-forming materials. The
tremendous slow-down of the particle motions when approaching the glass
transition and especially the fast processes in glass-forming materials, which
have come into the focus of scientific interest recently, make the
investigation in a wide frequency range highly desirable. Recently, results
from broadband dielectric spectroscopy on glass-forming materials in their
liquid and supercooled-liquid state, covering more than 18 decades of frequency
have been reported by our group. In the present paper, we give an overview of
the various experimental setups and techniques used to collect these spectra.
As an example, spectra of the prototypical glass former glycerol are presented.
