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Siemens AG
Entry type: FAQ Entry ID: 19781904, Entry date: 10/28/2004

What should be done in a situation where high noise (electrical and acoustic disturbance) is seen?

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QUESTION:  What should be done in a situation where high noise (electrical and acoustic disturbance) is seen?

ANSWER:  High noise levels result in the return echo, effectively being drowned and subsequently offering a low signal to noise ratio and thus an undefined echo. Therefore there is a high importance in keeping the noise value as low as possible. In parameter P807 the value of the noise can be displayed. (e.g. 5:10 (average:peak)) As a general rule: Always try to have a noise value that is less than 10dB for the average and lower than 20dB of the Peak. If we have higher values, the following points should be checked in order to improve the situation.

1. The transducer cable can pick noise when connected to a distribution terminal block in the cabinet. The solution to this is to connect the transducer cable/ extension directly to the Multiranger.

2. When the transducer cable is running in the same cable rack as power cables we often pick up high noise levels, this should be avoided. High frequency drives are often the cause of noise which can be reduced by rerouting the cable or moving the location of the Multiranger if necessary.

3. Avoid running Transducer cables in the same rack unless the transceivers may be synchronised.

4. Confirm that the transducer has been connected correctly using the recommended cable.

5. Check that the Transducer is hand tight only. One can pick up ringing, especially when connected to stainless steel fittings. If the noise value due to ringing does not reduce by loosening, a plastic isolation coupling may me used.

Make sure the Transceiver is grounded correctly and that the power supply has no floating grounds.

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