Chapter Q: Q: QAD QWERTY

QAD: Quarter amplitude damping. A method espoused by Ziegler and Nichols for tuning PID loop response to a step change.
QC teams: "Quality Control teams." A management technique of Statistical Quality Control (SQC) in which employees implement SQC.
QED: Quod erat demonstrandum. A Latin expression meaning "that is what has been demonstrated."
Q factor: 1. The ratio of the energy stored in a resonant circuit to the energy dissipated per radian. 2. A rating factor for electronic components such as coils, capacitors, and resonant circuits that equals reactance divided by resistance. 3. In a periodically repeating mechanical, electrical, or electromagnetic process, the ratio of energy stored to energy dissipated per cycle.
QFD: "Quality function deployment." A discipline for synchronizing and optimizing fabrication and assembly techniques.
Q meter: A direct-reading instrument that measures the "Q" (quality factor) of an electric circuit at radio frequencies by determining the ratio of inductance to resistance. Also known as "quality-factor meter."
Q-switch: An optical device that changes the "Q" (quality factor) of a laser cavity. This is typically done by raising it from a value below the laser's threshold to one well above that threshold. This technique produces a short, intense pulse, known as a "Q-switched pulse." Q-switches can be based on acousto-optic or electro-optic devices, rotating mirrors, frustrated internal reflection, or saturation of absorption in a dye.
quadrant detectors: Detectors that are divided up into four angularly symmetric sectors or quadrants. The amounts of radiation that are incident on each quadrant can be...

< Previous Excerpt Next Excerpt >

Purchase This Book

The Automation, Systems, and Instrumentation Dictionary, Fourth Edition

TABLE OF CONTENTS

Chapter Q: Q: QAD QWERTY

Contact Preferences

This is embarrasing...

Customize Your GlobalSpec Experience

Select Your Free Newsletters

Industry Newsletters

Select Your Free Product Alerts

This is embarrasing...