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9.
APPENDIX
Adjustment of Weighting
The reference level of each
this level (the OdB level on the weighting curve) yields
the same measured value as the F L A T
frequency counter
to accurately set the frequency of
oscillator
for
this
adjustment.
Filter
Unit
Weighting
Control
JIS-A
V R 1
D I N NOISE
VR2
DIN AUDIO
V R 3
C C I R
VR4
C C I R / A R M
VR5
Table 1
Filter Reference Level.
filter
is adjusted so t h a t
conditon.
Use a
Oscillator
Adjust
frequency
For:
OdB
1kHz
• indicatio
OdB
1kHz
indicatio
0«
1kHz
indicati on f
. 12.2dB
6.3kHz
indication
6.6dB
6.3kHz
indication
W i t h regard to C C I R
standards for semi-peak detection of noise levels,the
f o l l o w i n g characteristics are specified.
1.
One tone burst
value to be verified
summarized below.
wave of
5kHz frequency.
the
listed in the table
Tone burst duration ( m s ) ,
Measured value(%)
A l l o w a b l e range(%)
A l l o w a b l e range(%)
1
2.
Input a tone burst signal as shown below and
a response w i t h i n the l i m i t s shown below.
burst frequency
Tone burst repetition freque rcy (Hz)
Measured value (%)
Allowable
Allowable
range (%)
range (%)
"-16™
recommendations
and DIN 45405
is to be input and the
to be w i t h i n the
l i m i t s
The tone burst
is to be sine
The duration times are
below.
1
2
5
10
20
17.0
26.6
40
48
52
22.4
34
41
44
13.5
L o w e r l i m i t
60
21.4
31.6
46
55
U p p e r l i m i t
Table 2
is 5kHz.
2
48
Lower limit (96)
43
53
Upper limit(%)
Table 3
measured
50
100
200
o o
59
68
80
100
50
58
68
68
78
92
-
v e r i f y
The tone
10
100
77
97
72
94
82
100
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