Importing Data into an ALT Data Set
You can use the Import Wizard to import data into the ALT Data Points table for an ALT data set. Exporting data is not supported from any table in the ALT module.
For general information about using the Import Wizard, see Import and Export Wizard How-Tos. When more than one module is in use, to import data into an ALT data set, you must select ALT on the Select Product Module page. After you identify the data source file and all necessary format information, the Import Wizard displays the Select Import Type page.
1. Indicate whether you want to import the data points in the source file into a new or existing ALT data set and click Next.
Depending on you selection, either the New Data Set Parameters page or Choose Data Set page appears.
◦ If the New Data Set Parameters page appears, go to step 2.
◦ If the Choose Data Set page appears, go to step 3.
2. If the New Data Set Parameters page appears, do the following:
a. Specify the parameter values to use for the new data set, referring to the following table for option descriptions.
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Parameter
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Description
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Data set name
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The unique name to assign to the data set. By default, the name is New Data Set. If a data set with this name already exists, the name assigned is New Data Set (X), where (X) is the next available numeric value. You can specify any unique name that you want to use.
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Data type
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The type of data in the data set. The choices are Exact Times and Interval. The default is Exact Times.
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Suspensions
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Indicates whether the data to import contains only failures or both failures and suspensions. When this checkbox is cleared (default), only failures are present. When this checkbox is selected, both failures and suspensions are present.
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Grouped
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Indicates whether the data to imported is grouped. When this checkbox is cleared (default), the data is not grouped. When this checkbox is selected, the data is grouped.
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Stress type
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Indicates the type of stress applied to accelerate component aging. Choices are Constant and Time Varying (CEM). The default is Constant. When stresses vary over time, you use stress profiles. For more information, see Stress Profiles.
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Stress model
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The model to use to extrapolate the data in the ALT data set to predict reliability of the product at normal stress levels. Choices are Arrhenius, Eyring, Inverse Power Law, Temperature-Humidity, Temperature-NonThermal, Generalized Eyring, Proportional Hazards, and General Log-Linear. The default is Arrhenius. Only the Arrhenius, Eyring, and Inverse Power Law models support time-varying stresses. When any other model is selected, the stress is constant. For more information, see Life Stress Models.
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Distribution
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The distribution to use to model failure times. Choices are Weibull, Lognormal, and Exponential. The default is Weibull. For distribution descriptions, see Failure and Repair Distributions.
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b. Click Next. The Import Wizard displays the Select Field Assignments page. Go to step 4.
3. If the Choose Data Set page appears, do the following:
a. Click the drop-down control for Data set. A selection window opens, showing all ALT data sets.
b. Click the data set in which to import data. The window closes and your selection for Data set is shown.
c. Click Next. The Import Wizard displays the Select Field Assignments page.
4. Complete the Select Field Assignments page and all subsequent pages in the same manner as any other import. For more information, see Completing the Import.
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The column names shown on Select Field Assignments page are always the default column names, regardless as to whether you have specified custom column names as described in Changing the Names of Data Point Columns.
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