Measurement Computing eZ-PostView rev.2.0 - Manual (Page 143)

eZ-Analyst 957397 Glossary G-5
Transfer Type Functions
Functions that are calculated by dividing the cross spectrum of the channel pair by the auto
spectrum of the reference (force) channel. The following are transfer type functions:
Inertance (acceleration/force), Mobility (velocity/force), and Receptance or Compliance
(displacement/force). Reciprocal functions can be derived by taking the inverse of the
magnitude, and multiplying the phase angle by “-1.” Apparent Mass (force/acceleration),
Impedance (force/velocity), and Dynamic Stiffness (force/displacement) are reciprocal
functions of Inertance, Mobility, and Receptance, respectively.
Note: Transfer function displays assume that the reference channel is a force channel.
You MUST define the response channels to be the correct type of data
(acceleration, velocity, or displacement) that you are acquiring. These are
defined in the data type column of the Calibration window. This allows the data
to be integrated or differentiated correctly to derive the desired transfer function.
Trigger
An event to start a scan or mark an instant during an acquisition. A trigger can be a TTL
signal, a specified signal level, a button manually or mechanically engaged, or a software
command.
Unaveraged Spectrum
A display function of the magnitude of instantaneous unaveraged spectrum.
Windowed Time
Time data which determined by the FFT Response window; specified in the Miscellaneous Tab
(of the Configuration window).