For testing electronic components under existing environmental effects during their application, in-line testing systems are required. During process, the specimens pass through temperature zones consecutively on coded specimen carriers where they are heated or cooled to the required temperature. To minimize the energy input as well as the risk of icing within the cold zone the tunnel owns an entry and exit sluice which are purged with dry air. At the end of each zone, alternatively also within a sluice, the contacting and the functional check is effeceted by a computer which reflects the operating conditions. On leaving the in-line testing system, normally after passing the cold zone, a heat zone and afterwards the cooling down to room temperature, the specimens are identified as good or bad parts by selection of the specimen carrier bar code, sorted and appropriately processed. Almost 200 in-line testing systems of Weiss Umwelttechnik are in use. The required reliability and accuracy of those systems is ensured by a worldwide organised service, which can realise retrofittings which are required i.e. due to a change of the specimen. Thus, in-line testing systems are useable 10 to 15 years.
EPP EUROPE 537
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