YOKOGAWA ScopeCorder DL750, Руководство пользователя

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App-28
IM 701210-06E
SHARP Band-pass Filter Order Pass-band Width 15%
Center frequency 10% 11% 12% 13% 14% 15% 16% 17%
Order 155 110 89 73 62 52 49 41
Center frequency 18% 19% 20% 21% 22% 23% 24% 25%
Order 38 36 34 32 27 26 25 24
Center frequency 26% 27% 28% 29% 30%
Order 23 22 21 21 21
SHARP Band-pass Filter Order Pass-band Width 20%
Center frequency 12% 13% 14% 15% 16% 17% 18% 19%
Order 191 129 98 78 67 58 49 46
Center frequency 20% 21% 22% 23% 24% 25% 26% 27%
Order 40 38 36 31 29 28 27 26
Center frequency 28% 29% 30%
Order 25 24 20
Computation Delay
The group delay can be derived from the following equation. It is constant and depends
on the filter order.
Group delay = (Filter order – 1)/2
Unit: s/T
s
(where T
s
is the sampling frequency [s])
The computation delay can be derived from the following equation.
Computation delay = {4 + (filter order – 1)/2}
×
sampling period
However, if the sampling frequency exceeds 100 kHz, it is fixed to 100 kHz (10
µ
s).
It is also fixed to 100 kHz (10
µ
s) when in envelope mode.
Characteristics Examples
• SHARP Low-pass
-80
-60
-40
-20
0
0 f 0.1 f 0.2 f 0.3 f 0.4 f 0.5 f
5%
10%
20%
SHARP Low-pass Frequency Characteristics
dB
(f: sampling frequency [Hz])
Appendix 6 DSP Channel Computation (Optional)