Single Measurement Per Cycle
Application
a) Measurement systems in which the part is not changed by the measurement process; i.e., measurement systems that are nondestructive and will be used with parts (specimens) with:
Static properties, or
Dynamic (changing) properties which have been stabilized.
b) The shelf life of the characteristic (property) is known and extends beyond the expected duration of the study; i.e., the measured characteristic does not change over the expected period of use.
Assumptions
The measurement system is known (documented) to have a linear response over the expected range of the characteristic (property).
Parts (specimens) cover the expected range of the process variation of the characteristic.
Analyze using X & mR charts:
Determine measurement system stability:
Compare the plotted points to the control limits
Look for trends (x chart only)
Compare * (total measurement error) with the repeatability estimate E from a variability study .
Determine the bias if reference value is known:
source of Stability Studies : Analysis of measurement systems
