Svantek SVAN 979, Руководство пользователя

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SVAN 979 User Manual - Appendixes
Table B.1.17. Statistical analysis parameters (relevant only in Sound measurement mode)
Word
number
Name Comment
0 0nn09h
09h = block identifier
0nnh = block length in words
1 00pxxh
p = number of profiles, 0xxh = profile bit mask (bit mask informs for
which profiles parameters are available)
2.. ProfileStat[1]
Internal block with identifier 0Ah containing parameters of the first
profile (if the first profile bit mask is set)
... ...
...
... ProfileStat[p]
internal block with 0Ah containing parameters of the last profile (if the
last profile bit mask is set)
… reserved
Table B.1.18. Parameters of the profile histogram (block exists only inside the main block
– see
Table B.1.17 )
Word
number
Name Comment
0 0nn0Ah
0Ah = block identifier
0nnh = block length in words
1 N
number of statistical class histogram
2 BottomClass
first class histogram in 0.01 dB format
3 ClassWidth
class histogram width in 0.01 dB format
… reserved
Table B.1.19. Octave and partial octave spectra analysis
Word
number
Name Comment
0 004Ah
4Ah = block identifier
1 BlockLength
block length in words
2
reserved
3 SystemBase
filter database (2 or 10)
4 OctaveDivider
octave division (type of filters):
1
– octave filters
3
– 1/3 octave filters
6
– 1/6 octave filters
12
– 1/12 octave filters
5 FirstFreqIndex
index of the first filter; the exact centre filter frequency in Hertz
according to its index is given by the following formula:
f = 1000
· G
i/b
– for odd value b
f = 1000
· G
(2i+1)/(2b)
– for even value b
where:
G = 2
– for filter base 2
G = 10
0.3
– for filter base 10
i
– filter index
b
– octave division
6 N
number of octave or partial octave filters