Reliability HotWire: eMagazine for the Reliability Professional
Reliability HotWire

Issue 49, March 2005

Tool Tips

* Can I use Lambda Predicts parts libraries without having the Library panel open?

Lambda Predicts Library Manager allows you to load libraries in the background so that the parts are available to you but the Library panel is not taking up your workspace. Select Load Background Libraries from the Library menu. The Library Manager will appear, as shown next.

Click Add to open a new row. You can type the path (location and file name) of the library directly into the cell in the Path column or you can click the Browse icon:

to open a window that allows you to browse for the library that you want to add.

Once you have added all the libraries you want to open, make sure the Include checkbox is checked for each one, then click Load Selected Libraries. Once the selected libraries have been loaded, the window will remain open, allowing you to load additional libraries.

The libraries you loaded are now available for consideration in the part number search feature in the Data panel and in the Import Wizard.

* Is there an easy way to change the operating conditions for multiple components in Lambda Predict?

If your reliability prediction is based on the MIL-217 standard, you can use the MIL-217 Global Edit window to simultaneously change the operating conditions for all blocks and components within a given block or system, or even all MIL-217 systems within a project. To do this, select the block or system you want to modify in the System panel and select Global Edit from the Edit menu. The MIL-217 Global Edit window will appear, as shown next.

MIL-STD 217 Global Edit window

You can modify stress, temperature, environment or a combination of these by selecting the desired option(s) from the first row. As each option is selected, the corresponding section of the window becomes active.

To modify stresses, select one or more of the types of stress (voltage, current, or power). The input box and sliding scale for each selected stress will become active. Valid inputs are between 0 and 1.

To modify the ambient temperature, you can select either Absolute replacement, which will replace all current values of ambient temperature with the value you enter in the input box, or Incremental addition, which will add the value you enter in the input box to each current ambient temperature value. For example, in a project you might have a component in one MIL-217 system operating at an ambient temperature of 30C and a component in another MIL-217 system operating at 65C. If you choose to modify the ambient temperature of all MIL-217 systems in the project via incremental addition and enter a value of 5, the first component will now be operating at 35C and the second component at 70C.

To modify the operating environment, simply select one of the options in the Environment area of the window.

To determine the scope of the changes, choose the appropriate option from the Apply to section of the window. These options will vary depending on whether you selected a block or a system when you opened the window.


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