ILAC G8 · Decision Rule Visualiser
Simple acceptance & guard-band rules — normalised measurement axis
How to use this tool:
1. Select decision rule.
2. Adjust uncertainty and tolerance values
3. Use the measured value (Ym) slider to move the value
4. Read the instrument status statement (Pass, Fail, Pass*, Fail*)
5. Read the associated percentages for tolerance status
Ym
3.20
±T
4.00
um
0.800
Um (k=2)
1.600
TUR (T / Um)
2.50
Guard band w
0.000
Accept limit A = T − w
4.000
✓ PASS
Pass: |Y| ≤ A
Pass*: A < |Y| ≤ T
Fail*: T < |Y|, |Y|−w ≤ T
Fail: |Y|−w > T
PDF g(η)
Pass zone (≤A)
Pass* zone (A–T)
Fail* zone (T–T+w)
Fail zone (>T+w)
Statement: Instrument In Tolerance
Correct
—
False Accept (PFA)
—
Statement: Instrument Out Of Tolerance
False Reject (PFR)
—
Correct
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