Svantek SVAN 979 - Page 240

240
SVAN 979 User Manual - Appendixes
Word
number
Name
Comment
7
T
number of total results; total results, depending on the measurement
mode, are calculated with the following filters:
in vibration measurement mode:
Total[1] – measurement with HP filter
Total[2] – measurement with a filter from the second profile
Total[3] – measurement with a filter from the third profile
in sound measurement mode:
Total[1] – measurement with A filter
Total[2] – measurement with C filter
Total[3] – measurement with Z filter
8
Filter
spectrum measurement filter:
0 – HP
1 – Z
2 – A
3 – C
5 – B
9
Detectors
type of RMS detectors for spectra:
0 – linear detector (Linear)
1 – exponential detector Fast
2 – exponential detector Slow
10
Band
frequency range:
0 – full band (Full)
1 – audible band (Audio)
…
reserved
Table B.1.20. Parameters of 1/1 and 1/3 octave spectra histograms
Word
number
Name
Comment
0
0nn13h
13h = block identifier
0nnh = block length in words
1
N
number of histograms (spectra bands and total results)
2
NofClasses
number of statistical histogram classes
3
BottomClass
first class histogram level in 0.01 dB format
4
ClassWidth
histogram classes width in 0.01 dB format
…
reserved
Table B.1.21. Parameters of FFT analysis
Word
number
Name
Comment
0
0051h
51h = block identifier
1
BlockLength
block length in words
2..6
reserved
7..8
M
frequency resolution (total value of the mantissa)
9
E
frequency resolution (binary exponent); exact resolution of the
frequency in Hertz is given by the following formula:
∆F = M · 2
E