27
5.1.13
Reference SPL
reference level range,
Reference orientation, reference
position of microphone.
9.2.5 a),
9.3 a), b),
c)
94.0 dB
Wide range
Fig. 1 Reference
incidence direction
and reference point
position
5.1.14
Operating of the hold facility and
the means for clearing a display
that is held.
Measurement:
Maximum time-
weighted sound
level
L
ma x
, C
weighted peak
sound level
5.1.15
Dummy microphone: Design
goal and tolerance
9.3 g)
C a p a c it a n c e of
dummy microphone:
19 pF
Tolerance: ±3 pF
5.1.16
Highest SPL and Peak-Peak
input voltage without causing
damage.
9.3 i)
150 dB
28 Vp-p
5.1.17
Characteristics of each indepen-
dent channel to be described
N/A
5.1.18
Initial time interval after switch-
ing on power
9.2.5 e)
Less than 30 sec-
onds.
5.2
Adjustment to indicated levels
5.2.1
Model of sound calibrator(s)
9.2.4 a)
NC-74
NC-72A
5.2.3
Procedure for calibration & ad-
justment with sound calibrator
9.2.4 c)
C a l i b r a t i o n :
Acoustic cali-
b r a t io n w it h
Sound Calibrator
93.9 dB (NC-74),
114.0 dB (NC-
72A)
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