IEEE 1101.1:1998 pdf free download

IEEE 1101.1:1998 pdf free download.IEEE Standard for Mechanical Core Specifications for Microcomputers Using IEC 60603-2 Connectors.
12. Environmental specifications
12.1 Introduction
It is the purpose of this standard to ensure a minimum level of physical integrity and environmental performance in mechanical subracks, plug- in units, and backplanes, while taking into account the need for different levels of performance in different applications.
To provide a consistent and repeatable method for ensuring a minimum level of integrity and environmental performance during storage, handling, and transport, this clause details a standard test sequence that all sub-racks, plug in units, and backplanes specified in this standard shall be capable of passing.
In order to provide maximum compatibility with existing IEC standards, this standard refers to the IEC 60068, Environmental Testing Procedures series of documents. Where differences exist between this standard and the IEC 60068 publications, this standard shall take precedence.
It is the system designer’s resposibility to evaluate the correspondence between the system’s plug in units and subracks, and the system s environment.
12.2 Climatic tests
These tests are to be undertaken under non-operating conditions.
12.2.1 Steady cold
This test is in accordance with IEC 60068-2-1 (990-05); – 40。C for 72 hours.
12.2.2 Steady dry heat
This test is in accordance with IEC 60068-2-2 (1974-01); +70 °C for 96 hours.
12.2.3 Cyclic damp heat
This test should be run varying from +25。C to +40。C at 95% relative humidity for 21 days.
12.2.4 Salt mist
This test is in accordance with IEC 60068-2-11 (1981-01); 5% for 96 hours (crevice corrosion testing).
12.3 Mechanical load
Test condition.
12.3.1 Load per 1 HP (84 HP available)
See Table 10.
NOTE- Filler panels and plug in unit front panels shall be bolted onto the subrack.