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Automatic Calibration of a Computer Controlled System

IP.com Disclosure Number: IPCOM000073395D
Original Publication Date: 1970-Dec-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Merrill, JF: AUTHOR [+2]

Abstract

Automatic calibration is performed on a system, such as a test system, which applies stimuli to some controlled process or product and makes measurements characterizing the process or product. The stimuli and measurement equipment of the system are subject to inaccuracies and errors due to component tolerance, deterioration and environmental fluctuations. The calibration is performed by programming several stimulus units to specific conditions, then measuring one or more output conditions and following this with more stimulus setups and more measurements. The set of measurements of each tested unit determines its classification.

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Automatic Calibration of a Computer Controlled System

Automatic calibration is performed on a system, such as a test system, which applies stimuli to some controlled process or product and makes measurements characterizing the process or product. The stimuli and measurement equipment of the system are subject to inaccuracies and errors due to component tolerance, deterioration and environmental fluctuations. The calibration is performed by programming several stimulus units to specific conditions, then measuring one or more output conditions and following this with more stimulus setups and more measurements. The set of measurements of each tested unit determines its classification.

To calibrate the system, a table of measurement compensation factors (MCF's) is generated by establishing known standard conditions at the input of each measurement unit. The standard conditions are measured and the MCF's are computed based on the difference between the known inputs to the measuring units and the readings made by them. The MCF's are verified against the tolerance table and excessively large MCF's are identified. The MCF's are retained in a table and each time a measurement is made the appropriate MCF is applied to adjust the reading.

In the next step of the calibrating method, a calibrated stimulus program is generated. Each stimulus to be applied to the controlled process or product is described by a set of controllable parameters. The specified nominal values of these parameters are the values which produce the desired stimulus if the stimulus hardware is perfect. To achieve the calibrated stimulus, the stimulus specified by a nominal set of controllable parameters is applied to the system.

The stimulus is characteriz...