Chapter 5: Safety 53
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.
Labeling Symbols
The following symbols are found on the products, packaging, and containers.
Table 5: Acoustic Measurement Precision and Uncertainty
Quantity
Precision
(% of standard deviation)
Uncertainty
(95% confidence)
Pr 2.2% +
13%
Pr
.3
5.4% +15%
Wo 6.2% +
19%
fc < 1% +
4.5%
PII 3.2% +19% to -23%
PII
.3
3.2% +21% to -24%
Symbol Definition
Do not get wet
Type BF patient applied part
(B = body, F = floating applied part)
Indoor use only
Storage temperature conditions
Direct Current (DC)
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