PROBFAIL_S

Description: Returns the probability of failure for the specified time and stress level. If you do not enter the stress, the software assumes the use stress level conditions specified in the data sheet.

Syntax: PROBFAIL_S(Data_Src, End Time, [Confidence Level], [SL_1])

Data_Src is the source data sheet from which the probability of failure is calculated.
End Time is the time at which the probability of failure is calculated.

Confidence Level is the percentage (entered as a decimal value) for the 1-sided confidence bounds.

SL_1 is the stress level, for each stress type, at which the probability of failure is calculated. The number of stress level inputs is determined by the number of stress types in the specified data sheet.

Remarks:

The Data_Src can be one of the following values:

If using a default data source, it must be either 1, 2, 3 or 4, as selected from the Data Source Index drop-down list.
It can take a data sheet name (e.g., "Folio1!Data 1").
It can take a variable name defined in via the Defined Names window (e.g., datasource).

The End Time value must be greater than 0.
Confidence Level is an optional value and, if specified, must be greater than 0 and less than 1.
SL_1 is an optional value. The default value is the use stress specified in the Use Stress Level window, but you can change the value to any desired number. If the data sheet uses the Cumulative Damage model, you can also use a stress profile for this value.

Example:

PROBFAIL_S("Folio1!Data 1",5000,0.9,356) = 0.1231

Note that this value will vary depending on the source data set.