Relyence User Guide
Reliability Prediction Properties

Reliability Prediction Properties

Relyence Reliability Prediction properties enable you to control the parts library searching features, activate early life data calculations, set the upper confidence level to use for Telcordia-based calculations, and set default parameters for NPRD/EPRD data.

To access the Relyence Reliability Prediction Properties, click Properties in the Sidebar when Reliability Prediction is active. The Reliability Prediction Properties dialog appears.

Parts Library Searching

If enabled, the Relyence Parts Library and your own Parts Library (if you have one set up) are automatically searched for matching parts during data entry and during importing. During data entry, as you type into the Part Number field in the Parts Table, the list of Part Numbers is filtered as you go. If a Part Number found in the Parts Library is entered in the Parts Table, the data parameters for that Part are filled in for you.

When performing library searches, Relyence searches your own Parts Library first and searches the Relyence Parts Library second.

Note that you can enable and disable the searching feature at any time. It will take effect from that point forward. For example, if you have entered 5 Parts into your Analysis with the searching turned off, and you then enable the search, Relyence will not go back and re-search data for the 5 already added Parts.

The Relyence Intelligent Part Mapping feature will parse the Description to extract as much part data as possible and enter that information for you. Intelligent Part Mapping can optionally be enabled to operate only when importing, or for during both data entry and importing.

Search My Parts Library

If you have added Parts to your own Parts Library, this Library can be searched for matching Part Numbers. You can optionally turn this Library search on and off by selecting or clearing the Search My Parts Library checkbox.

Search Relyence Parts Library

If you want, you can turn off Part Number searching of the Relyence Parts Library. Select or clear the Search Relyence Parts Library checkbox to enable or disable searching. 

Intelligent Part Mapping

Relyence's Intelligent Part Mapping feature makes component data entry into Relyence Reliability Prediction faster and more efficient. Intelligent Part Mapping will parse the text of the Description field to extract as much part data as possible. The part data discovered will be entered automatically for you.

Select from the list of options for Intelligent Part Mapping: Always to enable Intelligent Part Mapping during data entry and importing, Never to disable Intelligent Part Mapping, or Import Only to operate only during Parts importing.

Some examples of Descriptions that Intelligent Part Mapping can interpret include:

CAP CER 10uF 50V

IC Logic

RES Thick Film

CAP 50 nF






CERM 0.2 pF

There are many more combinations that Relyence's Intelligent Part Mapping will recognize, these are just a few samples.

Calculation Properties

Early life data

If you have early life data and want to enter it during your analysis to assess early life factors, select the I have Early Life data checkbox. When selected, the early life data fields will appear on the reliability prediction forms.

Telcordia upper confidence level

You can set the upper confidence level to use for failure rate calculations employing the Telcordia methodology. By default, the value is set to 90. You can enter a value between 1 and 99.

The base device failure rates used in Telcordia are mean estimates and do not account for the uncertainty in the data used in their determination. You can adjust the certainty of the failure rate calculations by setting the upper confidence level (UCL). This is useful if you want a more conservative or less conservative failure rate estimation. For example, if you set the UCL to 60, it means that there is a 40% chance (100-60) that the predicted failure rate underestimates the actual failure rate. The higher the UCL, the more conservative the estimate, and, therefore, you are less likely to underestimate the true failure rate.

Cycles per Hour and Miles per Hour default values

If you are using failure rate data from NPRD or EPRD, in some cases the failure rate information is specified in cycles/hour or miles/hour units. To complete failure rate calculations, these units need to be converted to failure rate units. You can specify the cycles/hour and miles/hour default values to be used for calculations. You can also specify the cycles/hour and miles/hour setting for each part individually on the part data entry forms. If specified on the part form, that value will override these default settings. 

When you have completed setting your properties, click Save to save your changes.