gage r&r.ppt

文档介绍：Philips LCD Cells&Modules
Quality department
Ton Lonij
Date: 9 February 1998
H
Gage R&R
How accurate can we measure ?
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
True distribution of the length of product A
Length product A
Date: 9 February 1998
Measured with an infinitely accurate gauge
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
Measuring parts
Measurement
system
The environment
Date: 9 February 1998
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
Definition of a measurement system
Instrument
Operator
Date: 9 February 1998
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
Measurement variance
The difference between the
true value and the
measured value on the
measurement system
Date: 9 February 1998
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
Causes of measurement variance
The measurement system
Influence from the environment
Date: 9 February 1998
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
Environmental factors
Meas. systeem
Temperature
Humidity
Vibrations
Solution keep the environment stable
Date: 9 February 1998
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Philips LCD Cells&Modules
Quality department
Ton Lonij
H
Causes of measurement variance
related to the measurement system
Systematic offset : BIAS
Variance in offset over the measurement range : LINEARITY
Drift : STABILITY
Machine variance when measuring parts several
times : REPEATABILITY
Variance between operators: REPRODUCABILITY
Date: 9 February 1998
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
Causes of measurement variance
related to the measurement system
Systematic offset : BIAS
Variance in offset over the measurement range: LINEARITY
Drift : STABILITY
Solution Calibration and/or adjustment
Date: 9 February 1998
Philips LCD Cells&Modules
Quality department
Ton Lonij
H
The effect of measurement variance
Date: 9 February 1998