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How to Design Effective Computer-driven Measurement Systems
ATI's Applied Measurements Engineering course
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Summary:
How do you know your test measurements are valid?
Since NIST traceability actually guarantees little about
your test data, how do you know? Could you prove
validity to your customer? What is the right
measurements solution for your testing requirements? Is it
really as simple as the vendors say? What is your real cost
of invalid, ambiguous data causing retest or, worst of all,
hardware redesign?
This course is for engineers, scientists, and managers
who must use systems to understand experimental test
measurements on a daily basis. Learn how to design, buy
and operate effective automated measurement systems
providing demonstrably valid test data, the first time.
Fundamental & underlying engineering principles
governing the design and operation of effective automated
systems are demonstrated experimentally.
The result? Skilled people running more effective
testing programs generating unambiguous data, lowered
design verification risk and cost, and delighted customers.
Attendees receive a workbook and the instructor's book,
Applied Measurements Engineering.
Instructor:
Charles P. Wright (Chuck), founder of TRW Space
and Technology Division's Measurements Engineering
Department, has three decades of direct experience in the
design and operation of advanced multichannel, computer-driven
measurement systems. He developed the
knowledge-based measurement system concept as the
highest expression of systems design and operational
performance. He has published 60+ technical papers on
measurement system design, operation, and test process
improvement. As a contributing editor of Personal
Engineering and Instrumentation News, he has written 40+
bimonthly expert columns on Data Acquisition
since 1991. His book Applied Measurements
Engineering -- How to Design Effective
Mechanical Measurement Systems was
published in 1995 by Prentice Hall.
Education: BSME/MS Measurements
Engineering, Arizona State University; MS
Management, University of Southern
California.
What you will learn:
- How to guarantee your data.
- How to set the crucial system transfer functions to assure
valid data.
- How to follow the rules for waveshape and spectral
reproduction of data.
- The twelve things you have to control before you can
sample properly.
- How to absolutely eliminate deadly aliasing.
- How to identify and prevent 40% errors in 0.1%
systems!
- Foolproof automated methods for noise level
identification and control.
- How to operate successfully in the PC-based data
acquisition system market.
Course Outline:
- Basic Measurement Concepts. Fourteen real measurement horror stories and
why they happened. Measurements or instrumentation? Data validity or data
accuracy? Why you want less than 1/16th of the information from your system.
- Measurement System Transfer Functions and Linearity. Frequency and
phase responses -- more complicated than most think. First, second and higher
order systems. Single degree-of-freedom systems and damping. Output/input
linearity.
- Frequency Content or Wave Shape Reproduction? Rules for the
reproduction of frequency content. Rules for the reproduction of wave shape.
What price do you pay when you violate the rules? How can you recover?
- Non-Self Generating Transducers. Load cells, strain gages, resistance
temperature transducers, piezoresistive and servo transducers, etc. The basic
transducer model. Proper techniques for system set-up and operation.
- Wheatstone Bridge. The bridge as a computer. Bridge equations. Valid shunt
calibration techniques and calculation. The three wire circuit. Up to ten wire
circuits!
- Self Generating Transducers. Piezoelectric transducers. "Charge" amplifiers
and why they work. Thermoelectricity and thermocouples. The gradient
approach to thermocouple temperature measurements.
- The General Transducer Model and Noise. How all transducers and
components really work. Bulletproof noise level hunting and documentation
procedures. Differential systems and common mode performance.
Noise/Identification/Reduction Methods.
- Information Conversion. Carrier systems and why they work. Sinusoidal
excitation. Pulse train excitation--zero based and zero centered. Real examples.
- Frequency Analysis. Fourier spectra. Power or auto spectral density. Octave
and one-third octave analyses. Shock response spectra--what do they really tell
you?
- Sampled Measurement Systems. The twelve things you must know before
you sample. Nonsimultaneous or simultaneous sample and hold? Aliasing and
undersampling errors and how to prevent them. What antialiasing filters should
you use and why?
- Data Validation Methodologies. How do you know your data is valid? How
to use your software to answer the question.
- Knowledge-Based System Design Principles. The highest level of system
design. Operating effective measurement systems. World-class examples from
the spacecraft dynamics, thermal, and quasi-static structural test worlds.
- The Subject of Software. Commercial software. Commercial vs. in-house
developed software. Where's the risk?
- The Crucial Stuff They Didn't Teach You in College. The subjects of craft,
skill, responsibility, and professionalism as they relate to test measurements.
Tuition:
Tuition for this three-day course is $1490 per person at one of our scheduled public courses. Onsite pricing is available. Please call us at 410-956-8805 or send an email to ati@ATIcourses.com.
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