Library

Dave Formenti's Q&A Column - Articles on various topics. Published in Sound & Vibration Magazine

Transducer Signal Conditioning Overload Effects(42KB) - Jan99
The Exponential Window(106KB) - Feb99
Microphone Selection(21KB) - Mar99
The Relationship Between % of Critical and Actual Damping in a Structure(74KB) - Apr99
Dynamic Range(43KB) - May99
Accelerometer Dynamic Range(22KB) - Jun99
How to Check Condenser Microphones for Damage(17KB) - Jul99
Checking Piezoelectric Accelerometers for Damage(23KB) - Aug99
How Do We Define 'Overall' and 'Broadband'(77KB) - Sep99
Do Mode Shapes Determined from Two Different Impact Testing Techniques Contain the Same Information(41KB) - Oct99
Is it Important to Hit the Same Point in the Same Direction When Making Impact FRF Measurements(51KB) - Nov99
What is the Coherence Function and How Can It Be Used to Find Measurement and Test Setup Problems(38KB) - Dec99
What are the Sources of Variation in Frequency Response Function Measurements(112KB) - Jan00
Differences in Measurement and Studio Microphones(106KB) - Feb00
Excitation Direction in Modal Testing - Is It Important?(19KB) - Mar00
Measurement of Leq Using an Integrating SLM(43KB) - May00
Choosing a Spectral Measurement for Data Analysis(96KB) - Jul00

Tools

dB Math (46 kB) - An Excel spreadsheet for adding and subtracting dB.
Signal Analysis Demos (156 kB) - An Excel spreadsheet used in our Signal Analysis Seminars to demonstrate summation of waveforms, Fourier transform, Real/Imaginary Formats, etc.