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 HIGH
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
See Chapter C.3 for the A, C and Z filters characteristics.
“Human Vibration” frequency weighting filter (including Band Limiting filter).
See part C.4 for the frequency response characteristics.
• Wh from 0.8 Hz to 4000 Hz
Integrating filters (see part C.4 for the frequency response characteristics)
• Vel1 from 0.2 Hz to 4100 Hz
• Vel3 from 0.2 Hz to 4100 Hz
• Vel10 from 0.2 Hz to 4100 Hz
• Dil1 from 0.1 Hz to 260 Hz
• Dil3 from 0.2 Hz to 510 Hz
• Dil10 from 1 Hz to 2050 Hz
Special filter
Filter for the evaluation of the state of machines:
• VelMF from 0.2 Hz to 4100 Hz; conforms to the ISO 10816 standard (see part C.5 for the frequency
response characteristics).
Internal noise level for Sound Measurements
Noise voltage measured both in Sound Meter mode (with SV17 preamplifier, equivalent impedance - adapter
type of ST02 and 50 Ω input impedance) and Direct Sound mode (with 50 Ω input impedance).
Range Low
• ”A” weighting < 2,2 µV
RMS
(with digital noise compensation),
• ”C” weighting < 2,2 µV
RMS
. “”,
• ”Z” weighting < 2,2 µV
RMS
. “”,
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