Mts Multipurpose Elite Manual do Utilizador descarregar pdf (Página 213)

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DescriptionItemNumber

Note:

The variable parameters between the parentheses are

not the identities of the variables. They indicate the type

of variable that must be placed in the syntax.

For More Information

Concept

Calculation Unit Conversion Issues (p. 213)

Notation for Referencing Variables (p. 214)

Task

Calculation Unit Conversion Issues

Important:

To avoid unit-conversion issues, create a variable to hold any constant value (that has a dimension

and units associated with it) used in a calculation. You can assign any units that you want to the

variable and the application converts them to the base units when the calculation is performed.

Base units

Although MTS TestSuite applications allow the user to specify variable units, all calculations convert

variable values and constants to a constant set of base units. This can be problematic if you add a constant

to an equation and assume that it will use the same user-assigned units as the other variables in the

calculation.

Note:

When using the Calculation Editor, you can move the mouse over any variable in the calculation to

display a tool tip that specifies the base units used when that calculation is performed.

Example

For example, the following calculation would yield incorrect results because the test designer has entered

a constant that they assumed would match the user-assigned units.

y = x +(1)

where: the variable (x) has user-assigned units of feet and the constant (1) is assumed to also have the

same units of feet.

If the value of x=3 feet the assumption is that:

y = 3 ft. + 1 ft. = 4 ft. where: y is a variable with a dimension = “length” and units = feet

But, because the constant (1) is converted to the application’s base units for length (meters in this example),

the equation returns the following:

y = 0.9144 + 1 = 1.9144 so that: the displayed value of y = 6.281 ft. (not 4 ft.)

For More Information

MTS TestSuite | 213

Working with Variables

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