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Parameter
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Description
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Demonstration type
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The parameter for which the value is known. Choices are Reliability, MTBF, and LX. This last type is the age at which X percent of the population is expected to fail. The selection for this parameter determines the parameters that appear immediately beneath it.
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Reliability, MTBF, or X-value (%)
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The known value to use to compute accumulated test time. The defaults for each possible demonstration type are:
• Reliability = 0.9
• MTBF = 100
• X-value (%) = 10
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Confidence level (%)
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The percentage value to use to calculate the confidence bounds. The default is 90. For more information about confidence types and bounds, see Confidence Types.
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Allowable failures
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The number of allowable failures. The default is 1.
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Time OR LX
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If Reliability is the demonstration type, Time is shown so that you can enter the amount of time it takes to test each item. The default is 100. If MTBF is the demonstration type, no parameter is shown in this same area. If LX is the demonstration type, LX is shown so that you can enter the age at which X percent of the population is expected to fail. The value for the X-Value (%) parameter specifies the percentage of the population expected to fail. The default is 100. Examples of entering LX values follow:
• L[X] = The age at which X percent of the population is expected to fail.
• L1 = The age at which 1 percent of the population is expected to fail.
• L10 = The age at which 10 percent of the population is expected to fail.
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Test time / item
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Indicates whether to divide the accumulated test time that is calculated by the number of items entered in the field provided. When this checkbox is cleared (default), no division is performed. When it is selected, the result is divided by the integer entered in the field. The default is 1.
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