Crystal Instruments Spider - MODAL DATA ACQUISITION Introduction; Creating an MDA Test

Spider DSA User’s Manual
204
Modal Data Acquisition
Introduction
The Modal Data Acquisition (MDA) function for the Spider allows the user to
conveniently acquire modal data. It provides an interactive user interface for
testing, which allows the user the flexibility to assign geometric coordinates and
signal names to data files even in the middle of testing. Data files can then be
transferred to the PC and exported to the UFF or Binary UFF format with only a
few mouse clicks. After the data files are generated, the modal analysis software
provided by other parties, such as ME’scope from Vibrant Technologies, can be
used for modal analysis.
This chapter describes a step-by-step process of Spider MDA function and use the
ME’scope as an example for modal analysis.
Creating an MDA Test
Spider MDA function is an option of Spider FFT function. When creating a new
FFT test, simply check the Enable MDA function. Then press Next to
continue.
FRF signal type is automatically checked to conduct the MDA test.