Reliability HotWire

Issue 103, September 2009

Tool Tips

* How can my organization disseminate tips and instructions to Xfmea/RCM++ users about how to complete the FMEA worksheet?

If your organization has specific instructions for entering data in the FMEA worksheet, you can configure the Worksheet View in Xfmea and RCM++ to display tooltips when the user hovers over the column headers. The text that will be displayed in these tooltips is stored in the FMEASheet_Tooltips.txt file that is located in the application directory (e.g. C:\Program Files\ReliaSoft\Xfmea4 or C:\Program Files\ReliaSoft\RCM4).

To customize the tooltips to meet your organizations specific needs, open the file in Notepad or another text editor and change the default text to a version specific to your needs. Note that as the file includes text for all available data fields, the order given may not match how your worksheet is set up. You can disregard the tips for columns that will not be enabled for your organizations analyses.

Once the file is ready, distribute it to the users and tell them to save the file in the specified location on their computers. Then tell them to select the Show tooltips for worksheet columns check box on the Settings(2) page of the User Setup (File > User Setup).

* How can I define custom connection types for a MIL-HDBK-217F system in Lambda Predict?

The MIL-HDBK-217F guidelines for standards based reliability predictions can take into account the failure rate associated with the connection type used for certain types of components (e.g. capacitors and resistors). Lambda Predict 3 includes default connection types for most components. (For more information about the connection types available for each component, refer to Appendix A of the Lambda Predict 3 User's Guide.) If the default connection types do not fit your application, you can create your own connection types. You do so by using the Custom Connection window. To open it, choose Tools > Custom Connections.

You can create up to 10 custom connections. The connections that you define in this window will be available for selection in the "Connection Type" application parameter for applicable MIL-HDBK-217F components and blocks. Two custom connection types are provided with Lambda Predict; however, you can change them at any time.
 
For each component in a block, the connection type failure rate is multiplied by the value in the Number of Pins field in the component's physical properties. The resulting value is factored into the parent block's failure rate along with the component's failure rate.

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