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System Self-test (CIC)
Stand-alone, remote-controlled measurement stations are usually employed for long-term level monitoring. Over time, in reality, damage to the monitoring microphone, such as from vandalism, storm damage or animal attacks, can occur.
Thanks to the System Self-test (Charge Injection Check – CIC) in the new M2340 microphone, the proper functioning of the system can now be periodically remotely verified and documented.
Visualisation of the System Self-test (CIC)
An internal precision generator in the MA230 – this is the microphone preamplifier in the M2340 – produces two square-wave signals with the fundamental frequencies 46.9 Hz and 375 Hz. Including the harmonics of these square-wave signals, the test signal covers the entire spectrum up to 20 kHz. The generator is controlled via the ASD (Automatic Sensor Detection) data link to the microphone.
The test signal is capacitively coupled to the input of the MA230 preamplifier and attenuated by the capacitance of the microphone capsule. Before starting the measurement series, the reference spectral levels are recorded so that later measurements can be compared with this reference. If a capsule is damaged, its capacitance changes, which consequently leads to a change in the microphone signal level. This signal now passes through the preamplifier, the connecting cable and the input stage of the measurement instrument, where it is digitized and evaluated.
With the Remote Measurement interface, the XL2 makes available all commands to control the M2340 and to query the measured values, while the monitoring system – e.g. NoiseScout – takes care of the recording of the reference spectrum, the regular verification and the alarming in case of a significant level change or error.
Low-noise circuitry has a low impedance and therefore consumes more power. Therefore, a good compromise between power consumption and low noise is always sought, and this has been achieved very well in the new M2340: compared to the M2230, the current consumption has been reduced by 66% to 0.8 mA. The noise floor increases by only 1 dB, while the maximum processable sound pressure level has been increased by 1 dB. This makes the M2340 most suitable for power-saving applications such as long-term measurement stations.
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