Select the required "Auto Return at End" action using the control on the right hand side of
the screen. The force tester will stop at the end of the test unless "Auto Return at End" has
been selected when the crosshead will return to its home position. Note that the home
position is the position where the crosshead was when the force tester was last zeroed so is
usually the start of test position.
Note that the use of Automatic Return may cause damage to the load cell and/or the grips at
the end of a Tension test if the crosshead returns after breaking a stiff sample, e.g. a rigid
plastic or metal sample. This is because the sample will generally have increased in length
during the test so a compressive force will be applied to the load cell and grips as the
crosshead returns at maximum speed to its home position.
8.5
TEST LIMITS
SCREEN
After the basic settings have been set, press on the "NEXT" button at the bottom of the
screen to display the "LIMITS" screen.
Define the required "Test Speed". Press on the "TEST SPEED" entry area to display a
numerical keypad, enter the required value then press on the ENTER button. To change the
unit (which will be initially set to the "Default" Force unit), press the button to the right of the
Test Speed entry area to cycle through the available units.
If the “Ramping” check box is checked the machine will slow down at the end of a test when
a distance limit is specified to minimize the overshoot of the distance target. If this
“Ramping” check box is not checked and a distance limit is specified the machine may
overshoot the distance target, but will report the exact load and distance at the specified
distance target.
If a load limit is selected and the “Ramping” check box is checked the machine will not slow
down at the end of the test and the load and distance that will be reported may be slightly
greater than the target load specified in the test set up. If a load limit is selected and the
“Ramping” check box is not checked the machine will not slow down at the end of the test
and the load and distance that will be reported will be at the exact load value specified in the
test set up.
Decide how the test is to end. There are 2 methods provided to stop a test and these can be
used together.
1 Stop at a "Limit", which can either be a force or a distance
CS User Manual
53
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