Expected Failures

Description: Returns the expected number of failures for the specified period of time for one unit. If the data source contains failure times for non-repairable systems, the result is accurate when the start time is close to 0 and the end time is less than the MTTF value. If the data source contains the times to the first failure of a repairable system, the result is valid for any start and end time values.

Field Format: [EFAILURES(Source Number)(Start Time; End Time)]

Source Number is the associated data source number.
Start Time and End Time are the start age and additional operating time duration, respectively, of the period for which the number of failures are calculated.

Remarks:

The Source Number must be either 1, 2, 3 or 4.

The Start Time and End Time values must be greater than 0.

Example:

[EFAILURES(1)(500,200)]

Returns:

0.2920

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