Svantek Shawcity SVAN 977C, Руководство пользователя

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204
SVAN 977C User Manual - Appendixes
Word
number
Name Comment
3
reserved
4 Zoom
zoom flag
5..6 CentralFreq
central frequency in [mHz] (in case of Zoom = 1)
7..8 FreqResM
frequency resolution (integer mantissa)
9 FreqResExp2
frequency resolution (binary exponent)
note: frequency resolution is calculated from the formula:
∆F[Hz] = FreqResM * 2
FreqResExp2
10 N
number of FFT spectrum lines
11 T
number of TOTAL values
12 Band
band of the FFT analysis (values in hertz are approximate):
0
– 40 kHz,
1
– 20 kHz,
2
– 10 kHz,
3
– 5 kHz,
4
– 2.5 kHz,
5
– 1.25 kHz,
6
– 625 Hz,
7
– 312 Hz,
8
– 156 Hz,
9
– 78 Hz
13 Screen
screen function:
0
– HANNING,
1
– RECTANGLE,
2
– FLAT TOP,
3
– KAISER–BESSEL
14 ScreenFactor
screen correction factor (in 0.01dB)
15 Averaging
type of averaging:
0
– LINEAR
1
– EXPONENTIAL
16 TimeConst
time constant in [ms] (in case of Averaging = 1)
17 Filter
filter:
0
– HP,
1
– Z,
2
– A,
3
– C,
5
– B
18 InstFreq
instantaneous FFT spectrum frequency in [Hz]
… … …
Table B.1.20 RT60 parameters
Word
number
Name Comment
0
0xnn1A
[ 1A
= id, nn = block’s length]
1 RT60SaveMode
type of results in block 1B:
1 - results,
2 - averaged results
2 RT60Method_p
calculation method:
1 - DECAY ,
2 - IMPULSE