Oregon State University in Corvallis, OR recently purchased a 64-channel Spider-80SGi data acquisition system. Dr. Armin W. Stuedlein, professor of geotechnical engineering said the Spider DAQ will be used for studies on in-situ liquefaction and cyclic softening studies, performance of ground improvements, and testing of full-scale foundations.
Read MoreTotal Harmonic Distortion (THD) is a critical specification for signal analyzers and electronic components. This application note will provide a description of harmonics and harmonic distortion that is both brief and comprehensive.
Read MoreTrade shows are back and Crystal Instruments is enthusiastically attending. At each show Crystal Instruments highlighted the advantages of working with an innovative manufacturer like ourselves. Contact our team to discuss your project.
Read MoreWhy can’t I run a modal test with one big shaker and just “crank up the signal”?
That isn’t a good idea - Let’s discuss this.
OK – so we need to talk about a few things here. Many times people who get involved in modal testing sometimes come from the “vibration qualification world” and have a completely different mentality compared to the “modal world”.
Read MoreIt is our pleasure to announce that Crystal Instruments is expanding our business with a new office location:
Crystal Instruments Corporation
2090 Duane Avenue
Santa Clara, CA 95054
Come see our vibration controllers and dynamic signal analyzers in person and learn the benefits of Crystal Instruments test technology aimed at the most challenging testing requirements.
Read MoreSpectral flatness is a way to quantify the deviation of a passband from being perfectly flat across the frequency spectrum. Like most specifications, the behavior of signals measured in the passband is not ideal and we want to quantify the deviation from the ideal case.
Read MoreExecuting the modal analysis of a structure is crucial in order to analyze the modal parameters of a test object. The natural frequencies, damping and mode shapes of the unit under test provides help to adjust the mechanical properties of a structure by optimizing the design and improving the structural behavior of the test unit. Consequently, modal analysis is a critical part of product development.
Read MoreWatch the new Spider-80Ti video produced by Aakash Umesh Mange, Application Engineer at Crystal Instruments. Narration is provided by Walter Kemphaus, Application Engineer at Crystal Instruments.
The Spider-80Ti is a front-end from the Spider-80Xi hardware platform that enables temperature measurement. Spider-80Ti supports temperature measurements from Thermocouples and RTD (Resistance Temperature Detector) sensors.
Read MoreCan the test setup have an effect on the measured modal data?
Do the setup boundary conditions and accelerometers have an effect?
Most definitely!!!!! Let's discuss this.
Read MoreA manufacturer of laptop fans was suffering from the results of slow production testing. The testing capacity was limited by testing products with manually operating instruments in a quiet room. Crystal Instruments provided the easy-to-use Spider hardware and EDM software package as a solution to significantly improve their production testing.
Read MoreA typical vibration test often requires running the test up to 2000 Hz or beyond. This is a tremendous challenge because the resonant and anti-resonant frequencies are often only a few hundred Hz. This article analyzes the obstacles to running a sine test over a high frequency range, including the dynamic characteristics of the Unit Under Test (UUT) and fixtures, the control dynamic range of the vibration controllers, and the sensor mounting locations. Several strategies and recommendations are then discussed with results.
Read MoreThe common-mode rejection ratio (CMRR) specification defines how well a differential amplifier rejects common-mode signals. A common-mode signal is the same (common) to both conductors in a typical two conductor connection (signal conductor and ground conductor).
Read MoreIf we perform a roving impact hammer test and impact many points, is there any possibility of missing a mode? Well… you need to be careful where you place the accelerometer.
Read MoreStructural measurements on infrastructure are growing in demand given the aging buildings, bridges, and dams that populate countries around the world. Structural measurements are not the only measurements needed for aging infrastructure, but they do play a role. In the structural measurement category, Crystal Instruments offers products to measure and analyze data for large structure measurements like the measurements done on the Vieux Emosson Gravity Dam.
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