Svantek SV 973 - Page 151

SVAN 973 User Manual – Appendixes
151
Calibration
Acoustical - with the SV 34B acoustic calibrator (or equivalent):
• Calibration level
114.0 dB (equal to the calibrator pressure level - see
calibration chart of the used calibrator)
Note: The above levels correspond to 114 dB of calibrator’s sound pressure. If the calibrator
has a different sound pressure than 114 dB, the calibration levels must be accordingly adjusted.
Maximum peak voltage 3 V Peak-Peak (Maximum peak voltage of input sinusoidal
signal, which can be applied to the SLM without
destruction the meter)
Warm-up time 1 min. (for 0.1 dB accuracy)
Typical stabilization time after change
in environmental conditions by 20C
1 hour
Time shift after completion of a
measurement, before a measurement is
shown
< 1 sec
Note: When the instrument is moved from a warm environment with high humidity,
to a colder environment, care should be taken not to produce condensation inside
the instrument. In this case, much longer stabilization periods may be necessary.
Environmental, electrostatic and radio frequency criteria
Effect of humidity < 0.5 dB (for 30%<RH<90% at 40C and 1000 Hz)
Effect of magnetic field below electrical noise level (for 80 A/m and 50 Hz)
Effect of radio frequency fields meets requirements of IEC 61672-1:2013
The greatest susceptibility (the least immunity) is achieved when the SLM is placed parallel to the radio
frequency field and Z filter and time weighting F are selected and the SPL measurements are considered.
Effect of electrostatic discharge meets requirements of IEC 61672-1:2013
During electrostatic discharge, the influence of the displayed results could be observed.
No changes in instrument operation state, configuration or stored data corruption were found out.
Effect of ambient pressure < 0.01 dB/kPa
Effect of temperature < 0.5 dB (from -10C to + 50C)
Operating temperature from -10C to + 50C
Storage temperature from -20C to + 60C
Microphone
ST 973 free-field condenser microphone MEMS (½” housing)
Nominal sensitivity 11 mV/Pa (corresponding to -39 dBV/Pa re 1 V/Pa)
Output impedance 2 x 177,5 Ohm / 30nF, differential
Note: Maximum level of sound pressure level, which can be affect the microphone without
destruction the microphone: 160 dB.