Svantek SV 971A, Руководство пользователя

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SV 971A User Manual
– Appendixes
243
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
Basic accuracy <

0.2
dB (for the temperature T=+23°C

5°C for sinusoidal
signal 120 dB
RMS
in the band 5
Hz ÷ 20 kHz with filter
Z )
Measurement error in the full temperature range
<

0.1 dB (when the temperature is from -
10°C to +50°C for the
sinusoidal signal 120 dB
RMS
in the band 5
Hz ÷ 20 kHz with
filter Z )
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 40

C re Reference conditions).
Effect of magnetic field < 15 dB (A) or < 25 dB (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
).
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 Normal
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).