Maximum input voltage SVAN 958A meets the requirements IEC 348 for the 2
nd
class
device. The input voltage shall not exceed the limits between 0 V
and 28 V.
RMS detector
Digital “True RMS“ with PEAK detection
Resolution 0.1 dB
Range 213.7 dB
Crest Factor >100 dB (for signals in the 20 kHz band)
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 LIN filter)
Measurement deviation < 0.3 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 LIN
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
).
Antialiasing filter
Built-in antialiasing filter ensuring correct sampling of the measured signal.
Pass band (-1 dB) 22.4 kHz
Stop band 27.1 kHz
Attenuation in the stop band > 70 dB.
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