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SVAN 971 User Manual
– Appendixes
167
Antialiasing filter
Built-in antialiasing filter. Second-order analogue filter, passive Class, combined with on-chip FIR digital filter
of the analog-to-digital converter, ensuring correct sampling of the measured signal.
Pass band (-1 dB)
22.200 kHz
Pass band (-3 dB)
23.520 kHz
Stop band
26.256 kHz
Attenuation in the stop band
> 80 dB
Sampling frequency
48 kHz
(internal only)
Analogue to digital converter
1 x 24 bit
Reference range
LOW
Input attenuator accuracy
0.1 dB (for f = 1
kHz and T = +23°C)
Internal oscillator accuracy
0.01 % (for f = 1
kHz and T = +23°C).
Digital Filters
Weighting filters
•
A meeting requirements of the IEC 61672-1:2013 standard for the Class
1 “A” filter,
•
C meeting requirements of the IEC 61672-1:2013 standard for the Class
1 “C” filter,
•
Z meeting requirements of the IEC 61672-1:2013 standard for the Class
1 “Z“ filter,
•
B meeting IEC651 for the Type 1 filter
See part C.3 for the A, C, B and Z filters characteristics,
Noise voltage measured with SV18 preamplifier, equivalent impedance -adapter Class of ST02 and 50
Ω input
impedance.
Range Low
•
”A” weighting
< 2.8
µV
RMS
•
“B” weighting
< 2.8
µV
RMS
•
”C” weighting
< 2.8
µV
RMS
•
”Z” weighting
<
7 µV
RMS
.
Range High
•
”A” weighting
< 7
µV
RMS
•
“B” weighting
< 7
µV
RMS
•
”C” weighting
< 7
µV
RMS
.
•
”Z” weighting
< 17.6
µV
RMS
Low-pass
filters
8 eighth-order elliptic filters with the cut-off frequencies from 10 kHz to 78.125 Hz in the binary sequence.
Ripple in the pass band
0.1 dB.
Attenuation in the stop band
> 100 dB.
Содержание SVAN 971
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