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 instruments. 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 40C 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.
The instrument produces greatest radio-frequency emission when an extension cable is connected. The cable
placed as a solenoid may produce unexpected emission depending on its physical dimensions. Any
configuration w/o extension cable reduces emission below 30 dBuV/m.
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 -10C to + 50C)
Operating temperature from -10C to + 50C
Storage temperature from -20C to + 60C
Microphone
ACO 7152 1/2" prepolarised free-field microphone
Typical sensitivity 32 mV/Pa (corresponding to -30 dBV/Pa re 1 V/Pa)
Capacitance 18 pF
Reference point geometric centre of the microphone diaphragm
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