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 40C 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
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