Crystal Instruments Spider - Page 5

Spider DSA User’s Manual
5
Event Action Rules Setup .................................................................................................... 164
Reports ..................................................................................................................................... 164
Black Box Mode ....................................................................................................................... 169
Run the Test with Front Panel ............................................................................................. 174
Using Socket Messages to Communicate with Other Applications ......................................... 175
Database Backup and Restore ................................................................................................. 176
Accessing an SQL Server Remotely ......................................................................................... 178
REAL-TIME FFT ANALYSIS 184
Dynamic Signal Analyzer Basics .............................................................................................. 184
Power Spectrum ................................................................................................................... 184
Cross Spectrum .................................................................................................................... 185
Frequency Response Function ............................................................................................. 185
Shock Response Spectrum ................................................................................................... 186
Test Parameters ....................................................................................................................... 189
Run Schedule ........................................................................................................................... 191
Measured Signals in FFT ......................................................................................................... 191
Output Setup ............................................................................................................................ 193
Control Panel ........................................................................................................................... 194
Curve Fit................................................................................................................................... 198
Curve Fit Setup .................................................................................................................... 199
Calculate Curve Fit ............................................................................................................... 199
Curve Fit Table .................................................................................................................... 200
Define A Custom Synthesis Table ....................................................................................... 202
MODAL DATA ACQUISITION 204
Introduction ............................................................................................................................ 204
Creating an MDA Test............................................................................................................. 204
STRAIN MEASUREMENT AND ANALYSIS 206
Hardware ................................................................................................................................ 206
Spider-80SG ....................................................................................................................... 206
Input Channel Adapter ....................................................................................................... 207
Spider-80SG LEMO input pin-out ..................................................................................... 207
Anatomy of a Strain Gage ................................................................................................... 208
Strain Gage Processing ....................................................................................................... 209
Spider-80SG Wheatstone Bridge Hardware ....................................................................... 210
Connecting Strain Gages ...................................................................................................... 211
Quarter Bridge Connections ................................................................................................ 212
Half Bridge Connections ...................................................................................................... 214