This tool implements the MIL-HDBK-217F, Notice 2 (Reliability Prediction of Electronic Equipment), parts count reliability prediction procedure (ref. 1). Application notes are as follows:
1. The part quantity column (last column) defaults to 1 if nothing is entered into this field.
2. Selecting defaults for part quality and/or environmental factors will override all entries in the larger input matrix for these factors. Selecting the "industrial" default for part quality will default the microcircuit quality levels to a value of 3 and will select one level better than worse case for all other part types. See references 3 and 4 for other industry standard approaches.
3. The part quality factor selected (third input column) must be consistent with the part type selected in the second column.
4. If anything is entered into the user defined column (e.g., a part number), then this column will appear in the output, otherwise it is omitted.
5. The first row is used for column labels initially; however, this row is available for use by deleting/overriding the labels.
6. The tool simplifies the microcircuit portion of the MIL-HDBK-217 parts count method by defaulting the learning factor to 1.0 and not providing the quality factor calculations for custom part screening regimes, as both of these are rarely used in practice. If needed, export to Excel to perform these custom calculations.
7. Most browsers remember user input settings when the back button is used allowing easy modification of inputs; however, this may not be true with some versions of Internet Explorer.
8. The "omit part type reference numbers" checkbox eliminates the prefix numbers (1-208) shown in the second column from the output results.
9. See references 3 - 4 for ANSI/VITA recommendations on more favorable part quality factors, essentially 0.1 for chip resistors and capacitors, and a value of 1.0 for most other part types. Export to Excel to make these adjustments.
10. MIL-HDBK-217F, Notice 2, Environmental Descriptions and Assumed Default Operating Temperatures
11. Reliability Adjustment Factors for Electronic Equipment