MTS TW Elite - Manual (Page 77)

Settings that Affect Polarity
Description Item
Upper and lower workspace selection. These buttons are only available on test
systems equipped with dual workspaces. These buttons allow operators to easily 1
switch between different test zones without manipulating the test resources or using
a different test that has unique polarity settings for different workspaces.
For example, consider a scenario in which you have designed and validated a test
that you expect will be run in the lower workspace and the Polarity of all float signals
used by the test are set to Normal. To run the same test in the upper workspace,
the operator would need to change the polarity setting of all float signals in the test
that measure values relative to the bottom of the frame from Normal to Inverted in
order to achieve the appropriate test results. By doing this, the operator would be
changing the test and a future operator may not be aware of these changes.
In contrast, using the workspace selection buttons only requires the operator to
select the upper workspace in order to achieve the same result when changing
workspaces. When the operator selects the appropriate workspace, he or she
achieves the desired test results without having to modify the test. As a result, this
allows the operator to run a single test using either the upper or lower workspace.
Polarity selection. Use this setting to change the polarity of a float signal. Changing
this setting affects the Effect of Increasing Extension setting. Available settings
are Normal and Inverted. 2
Effect of Increasing Extension selection. This setting defines the relationship
between the crosshead/displacement channel and each float signal. 3
• Select Increases Value when an increase in the crosshead or actuator extension
will increase the value of the signal.
• Select Decreases Value when an increase in the crosshead or actuator extension
will decrease the value of the signal.
• Select Indefinite for signals (such as time) where there is no direct relationship
to the crosshead or actuator extension.
MTS TestSuite | 77
Design Guidelines