SonoSite S-Cath - Acoustic Measurement Precision and Uncertainty

Chapter 6: Safety 121
Safety
Acoustic measurement precision and uncertainty
Alltableentrieshavebeenobtainedatthesameoperatingconditionsthatgiverisetothe
maximumindexvalueinthefirstcolumnofthetable.Measurementprecisionanduncertainty
forpower,pressure,intensity,andotherquantitiesthatareusedtoderivethevaluesinthe
acousticoutputtableareshown
inthetablebelow.Inaccordance withSection 6.4oftheOutput
DisplayStandard,thefollowingmeasurementprecisionanduncertaintyvaluesare
determinedbymakingrepeatmeasurementsandstatingthestandarddeviationasa
percentage.
Table 38: Acoustic Measurement Precision and Uncertainty
Quantity
Precision
(% of standard deviation)
Uncertainty
(95% confidence)
Pr
1.9% +11.2%
Pr
.3
1.9% +
12.2%
Wo
3.4% +10%
fc
0.1% +4.7%
PII
3.2% +12.5 to -16.8%
PII
.3
3.2% +13.47 to -17.5%