BS ISO 9022-23:2016 pdf free
BS ISO 9022-23:2016 pdf free.Optics and photonics一Environmental test methods
Prior to commencement of testing, all specimens shall be inspected for interior moisture caused by excessive humidity during assembly. The specimens shall be cooled at a test chamber temperature of -10 °C, long enough for all parts of the specimen to reach a temperature within at least 3 K of the test chamber temperature. The specimens shall then be heated immediately in a preheated test chamber at approximately 40 °C. The specimens shall be closely observed during heating, and any in which a coating of moisture appears, even briefly, shall be excluded from the test.
In order to establish the warm-up time of the internal air during the cycling, sensing devices shall be mounted in a representative number of separate internal air spaces of the specimens. The time period to be measured is that required for the heating of the internal air in the changeover from step 2 to step 1 to a temperature within 3 K of the prescribed test chamber temperature in step 1. This time period shall be considered as the exposure time in step 1. If several sensing devices are used, the mean of the individual measurements shall be considered as the exposure time.
The specimen shall be subjected to condition 2 immediately after condition 1. Transfer to condition 3 shall also be performed immediately. The specimen shall be constantly observed during the warm-up period in condition 3 (intermediate test). This is to establish whether, to what extent and over what time period, a coating of moisture occurs on the internal optical surfaces.
The preliminary test as described in 5.4.2 shall be carried out. The specimen shall be evacuated after reaching the test temperature in condition 1. After the prescribed exposure time, the specimen shall be sealed and stored under the same climatic conditions for the duration of the exposure time as that prescribed for condition 2. BS ISO 9022-23 pdf download.
