Philips HD11 XE - Table 2-1 Acoustic Measurement Precision; Table 2-2 Acoustic Measurement Uncertainty

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Ta b l e 2 - 1 A c o u s t i c M e a s u re m e n t P re c i s i o n
NOTE
Per Section 6.4 of the Output Display Standard, measurement precision on the
following quantities is determined by making repeated measurements and stating
the standard deviation as a percentage.
Quantity
Precision
(Percentage Standard Deviation)
Pr is the underated peak rarefactional
pressure measured in MegaPascals.
Pr: 5.4%
Wo is the ultrasonic power in
milliWatts.
6.2%
f
c
is the center frequency in MHz
(NEMA UD-2 definition).
<1%
PII.3 is the derated spatial-peak pulse
intensity integral in Joules/cm
2
.
PII.3: 3.2%
Table 2-2 Acoustic Measurement Uncertainty
Quantity
Measurement Uncertainty
(percentage, 95% confidence
value)
Pr is the underated peak rarefactional
pressure measured in MegaPascals.
Pr ± 11.3%
Wo is the ultrasonic power in
milliWatts.
± 10%
f
c
is the center frequency in MHz
(NEMA UD-2 definition).
± 4.7%
PII.3 is the derated spatial-peak pulse
intensity integral in Joules/cm
2
.
PII.3: +18% to -23%