When performing very long tests, it is recommended that the data rate is reduced to use less
memory and a suitable data rate is 10Hz. When performing very short tests, the data
rate
can
be increased up to 1000Hz, if required, noting that more memory will be used during the
test because more data is being stored.
Select the required "Auto Zero" action using the controls on the right hand side of the
screen. When Auto Zero is selected, the force tester distance and force will be set to Zero
before every test.
However, please note that this feature can cause incorrect force readings especially if wedge
grips are being used. When a wedge grip is tightened, a compressive force may be applied to
the sample and if this is zeroed out by the Auto Zero function, a force offset is produced and
any measured force values will be incorrect.
It is therefore recommended that the force tester is Zeroed before a BATCH of tests is
started and NOT zeroed between each test.
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.
7.2
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.
46 CS User Manual
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