SV 977D User Manual - Appendixes
Reference conditions as per IEC 61260-1:2014
• Reference temperature +23°C
• Reference relative humidity 50%
• Static pressure 101.325 kPa
Calibration (electrical)
Calibration level 0.5 V
RMS
(114 dB re 1 µV)
Basic accuracy < 0.2 dB (for the temperature T=+23°C 5°C for sinusoidal
signal 1 V
RMS
in the band 5 Hz ÷ 20 kHz with the Z filter)
Measurement deviation < 0.1 dB (when the temperature is from -10°C to +50°C for the
sinusoidal signal 1 V
RMS
in the band 5 Hz ÷ 20 kHz with the Z
filter)
Overload detector
The instrument has the built-in overload detectors. Both A/D converter and input amplifier overload conditions
are detected. The overload in the measurement channel (in its analogue part) and the overload of the
analogue / digital converter are both detected. The “overload” indication appears when the input signal
amplitude is 0.5 dB above the declared “Peak measurement range”.
Warm-up time 1 min. (for 0.1 dB accuracy).
Effect of humidity < 0.5 dB (for 30%<RH<90% at 40C re Reference conditions)
Effect of temperature < 0.5 dB (from -10C to + 50C)
Effect of magnetic field < 5 µV
RMS
(A) or < 20 µV
RMS
(Z) (for 80 A/m and 50 Hz)
Effect of Vibration < 0.1 dB (from 20 Hz to 1000 Hz at 1 m/s
2
)
Electrostatic and radio frequency criteria – see Chapter C.1.1
Sampling frequency 48 kHz or 96 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)
Antialiasing filter
Built-in antialiasing filter. Second-order analogue filter, passive Class, combined with on-chip FIR digital filter
of the analogue-to-digital converter, ensuring correct sampling of the measured signal.
Pass band (-1 dB) 22.200 kHz or 44.4 kHz
Pass band (-3 dB) 23.520 kHz or 47.0 kHz
Stop band 26.256 kHz or 52.53 kHz
Attenuation in the stop band > 80 dB
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