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 Are
there any basic tips for using the Function Wizard to build
custom analyses and reports?
Many of ReliaSoft’s standard software tools offer the
ability to use built-in spreadsheets for custom analysis
and reporting. When you use the Function Wizard to build
functions in these spreadsheet reports, here are a few basic
tips to keep in mind. (Note: Although the pictures shown
are from Weibull++,
similar functionality is available in
ALTA and
RGA.)
- If your regional settings use a comma as the decimal
separator, the software will use a semicolon to separate
function arguments. For example:
- =RELIABILITY(Default;250;;0,95)
returns the 95% 1-sided confidence bound on the
reliability at 250, based on the default data sheet.
- If you want the function results to vary depending
on what has been entered into another cell in the spreadsheet,
you can enter a spreadsheet cell reference as the function
input. For example:
Note that you can click the icon at the right side of
the input box to automatically enter the reference for
the cell that is currently selected in the spreadsheet.
If you press CTRL when you click the icon, the
reference will be absolute (e.g., $B$1).
- Although spreadsheet cells are referenced
by a letter for the column and a number for the row,
if the function requires you to specify a cell in the
data source, you must use numbers to identify
both the row and the column, and these coordinates are
entered as separate inputs. For example:
- =DATAENTRY(Default,2,1)
returns the value that was entered into row 2
of column 1 (a.k.a. cell “A2”) in the standard
folio that is the data source for this function.
- If the required input is text, it must be enclosed
in quotation marks. This includes the name of a specific
data sheet when the function is not using the default
data source. It also includes dates/times when they’re
entered in a text format rather than a serial number.
For the data source, the software will apply the quotes
when you insert the function into the spreadsheet. For
other inputs, you must include the quotation marks in
the text that you type into the Function Wizard input
field. For example:
How
can I apply a derating standard to one of my reliability
prediction analyses in Lambda Predict?
In Lambda Predict
3 predictions you can select a derating standard
at the System level that applies to all components and blocks
within that system. To select a derating standard, click
the system in the System Hierarchy panel and then choose
Tools > Apply Derating Standard.
In the Available Standards field, select any published
or user-defined derating standard, and then click OK.
In the System Hierarchy panel, the status of each component
in the system with regards to derating is indicated by the
component’s icon:
- A green icon indicates that the component meets
the derating requirements defined in the standard (i.e.,
the stress level and temperature fall within the nominal
case curve).
- A light blue icon indicates that the component does
not meet the derating requirements, but it is not overstressed
(i.e., the stress level and temperature fall outside
the nominal case curve, but within the worst case curve).
- A red icon indicates that the component is overstressed
according to the derating standard (i.e., the stress
level and temperature fall outside the worst case curve).
- A dark blue icon indicates that the component is
not included in the derating standard and therefore
derating has not been applied to the component.
To view detailed derating information for a component,
select it and choose Tools > View Component Derating
Information.
All of the information on the Derating tab applies to
the stress that is selected in the Stress field.
The values used to create the nominal case curve and
the worst case curve are displayed on the left. The plot
area on the right translates these points into the derating
curves. By default, the nominal case curve is displayed
in green and the worst case curve is displayed in red. The
blue dot on the plot shows where the component stands with
respect to the requirements of the derating standard. You
can point to elements in the plot to view their description
and, in the case of points, their coordinates.
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