Svantek SVAN 971 - Page 167

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.