8.6.2 Method of measurement
The EUT shall be placed in a chamber at normal room temperature and relative humidity. The temperature shall then be reduced to and maintained at- 15 ℃ ± 3 ℃ for protected equipment and -25 ℃ ± 3 ℃ for exposed equipment, for a period of 10 h to 16 h. Any climatic control device provided in the EUT may be switched on at the conclusion of this period.
The EUT shall be switched on 30 min later, or after such period as agreed by the manufacturer, and shall be kept operational for at least 2 h during which period the EUT shall be subjected to the performance check in subclause 7.2.7
The temperature of the chamber shall be maintained at -15 ℃ ± 3 ℃ for protected equipment and -25 ℃ ± 3 ℃ for exposed equipment, during the whole test period.
At the end of the test, the EUT shall be returned to normal environmental conditions or to those required at the start of the next test.
8.6.3 Result required
The equipment shall meet the requirements of the performance check.
8.7 Corrosion
According to IEC 60945 8.12
8.7.1 Waiver
The test shall be waived where the manufacturer is able to produce evidence that the components, material and finishes employed in the equipment satisfy the requirements of this test.
8.7.2 Objective
To demonstrate that the EUT may be exposed to a salt laden atmosphere without physical degradation.
8.7.3 Method of measurement
The EUT shall be place in a chamber and sprayed with a salt solution for 2 h at normal temperature. The salt solution shall be prepared by dissolving 5 ± 1 parts by weight of sodium chloride (NaCl) in 95 parts by weight of distilled or demineralised water.
At the end of the spraying period the EUT shall be placed in a chamber which shall be maintained at a temperature of + 40 ℃ ± 2 ℃ and a relative humidity between 90 % and 95 % for a period of 7 days.
The EUT shall be subjected to a test comprising 4 spraying periods, each of a duration of 2 h, with a storage period of 7 days after each spraying.
At the conclusion of the test, the EUT shall be inspected with the naked eye without magnification. The EUT shall then be subjected to the performance check.
8.7.4 Result required
There shall be no undue deterioration or corrosion of metal parts.
The EUT shall meet the requirements of the performance check.
8.8 Acoustic noise and signals
According to IEC 60945 11.1
