In This Topic
For calculations for long-term statistics, go to Calculations for the gap distribution (long-term statistics) for Allocate Gap Pools.
μGap,ST
Short-term gap mean after allocation
σGap,ST
Short-term gap standard deviation after allocation
Z.LSL(ST)
- If only lower specification in the assembly gap is given
- Z.LSL(ST) = (T – LSL) / σGap,ST
- If only upper specification in the assembly gap is given
- Z.LSL(ST) = '*'
- If neither lower nor upper specification in the assembly gap
- Z.LSL(ST) = T / σGap,ST
Z.USL(ST)
- If only upper specification in the assembly gap is given
- Z.USL(ST) = (USL – T) / σGap,ST
- Otherwise
- Z.USL(ST) = '*'
Z.BenchGap,ST
- If neither lower nor upper specification in the assembly gap
- Z.BenchGap,ST = Φ−1(Φ(Z.USL(ST)) – Φ(–Z.LSL(ST)))
- If only upper specification in the assembly gap is given
- Z.BenchGap,ST = Z.USL(ST)
- Otherwise
- Z.BenchGap,ST = Z.LSL(ST)
