The electrostatic actuator is used for remote system check of the instrument, which enables checking
the acoustical measurement input of the instrument.
The System Check procedure consists of a sequence of measurements of background noise and a level
generated by the electrostatic actuator (94dB). The measurement of background noise is carried out
before and after the measurement of a signal level from the actuator. It is assumed that a one-second
RMS(C) of the background noise measured for 3 consecutive seconds must be at least 20 dB lower
than the nominal level generated by the electrostatic actuator (94dB). If this condition is not met, system
check is unsuccessful. If the background condition is met, the station switches on the actuator and waits
for stable one-second RMS(C) values with an accuracy of ±0.1dB. The stabilized RMS(C) value of the
signal from the actuator cannot deviate from the nominal value (94dB) more than ±1dB. The system
check result (OK or Failed) together with the measured levels the background noise and the signal from
the actuator is recorded in the calibration and system check history file. The duration of the system
check sequence is typically <15s and can be extended up to <25s in the case of longer stabilization
period of the RMS(C) generated by the actuator. In the case of the automatic system check function,
when the test result is negative, it is repeated 4 times more every 1 minute to obtain a positive test
result. If the result is still negative, subsequent attempts are abandoned to the next planned system
check.
The measurements are paused for the duration of the system check procedure (active pause).
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