11.0
DISTANCE
COMPENSATION
11.1 GENERAL
The "Distance Compensation" is a specialized feature that is required when distance
accuracy is important. Please note that there will always be movement in the load cell
during a test because it is a physical transducer and movement is necessary to measure the
applied forces. There will also be movement in the force tester frame when it is loaded to full
capacity.
The "normal" distance measurement is suitable for most tests but may give errors when very
small distances are being measured at high forces, e.g. compression tests on rigid materials
(ceramics etc.)
The "Distance Compensation" feature significantly reduces the distance errors
during small
movements at high forces. The combined load cell and frame movement under load is
measured and compensated by performing a special” Test” with either a VERY STIFF
tension sample fitted into tensile grips or no sample fitted between compression plates.
Note that the "Distance Compensation" feature is available for all types of test.
The "TEST SETTINGS" screen has a "Distance Compensation" option shown on the left
hand side and this option defaults to "NONE". Press on the "Distance Compensation" drop
down to display the "Distance Compensation" names.
The force tester has storage for up to 10 named compensation factors. These are all initially
undefined and are named “Empty 0”, “Empty 1” etc as shown below. If a “Distance
Compensation” has been previously created, it will be displayed in the list and can be
selected by pressing on the required name.
11.2 CREATING
A
NEW DISTANCE
COMPENSATION
A "Distance Compensation" test is named, created and performed using a series of
steps as shown below:-
1 Display the "TEST SETTINGS" screen for the required type of test.
98 CS User Manual
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