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Option
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Description
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Vibration Screening
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The type of vibration screening that is performed. Choices are:
• No Vibration Screening — When selected (default), no vibration screening is performed. Percent Failures from Vibration is the only option available. If any other item is selected, all options are available.
• Random Vibration — When selected random vibration screening is performed.
• Swept Sine Vibration — When selected, swept sine (sequential) vibration screening is performed.
• Fixed Sine Vibration — When selected, fixed sine vibration screening is performed.
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Vibrational Force
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The amount of force that the vibration exerts on the assembly being tested. The default is 0. The range is from 0 to 20.
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Axis Sensitivity Factor
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A percentage value that indicates the sensitivity of the assembly being tested to the vibrational effect. The default is 0. The range is 0 to 100.
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Test Duration (minutes)
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The number of minutes that the screening lasts. The default is 0. The range is from 0 to 1000.
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Percent Failures from Vibration
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The percentage of failures that occur due to vibration. The default is 20. The range is from 0 to 100. The sum of the value in this field and the value in Percent Failures from Temperature Cycling on the Infant Mortality - Temperature pane must always be equal to 100. If you change the value in this field, the value in Percent Failures from Temperature Cycling automatically changes.
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Detection Efficiency
The options under this heading provide additional information about the detection efficiency of the vibration screening.
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Testing Type
Efficiency %
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The type of testing and its screening efficiency percentage. Choices are:
• Functional — When selected (default), functional testing is performed. The default for Efficiency % is 65. The range is from 50 to 80.
• Functional and Parametric — When selected, functional and parametric testing is performed. The default for Efficiency % is 90. The range is from 80 to 100.
Although the testing type does not affect the calculation, the efficiency percentage does affect it.
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Conditions
Efficiency %
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The conditions under which testing is performed and the percentage of efficiency for these conditions. Choices are:
• Testing at Ambient — When selected (default), testing is performed at the ambient temperature. The default for Efficiency % is 40. The range is from 20 to 60.
• Testing Concurrent with Stress — When selected, the screening is performed under stress. The default for Efficiency % is 100 and cannot be changed.
Although the condition does not affect the calculation, the efficiency percentage does affect it.
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Isolation %
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The percentage that the factors attributed to detection efficiency can be isolated from the rest of the screening process. The default is 80. The range is from 80 to 100.
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