LS User Manual 29
8.0 PERFORMING A TEST
8.1 PERFORMING A TEST
The LS machines can be used to perform tests in two modes, as a stand-alone machine or under
computer control with NEXYGENPlus™ software.
If the machine is to be used with a computer and NEXYGENPlus™ software, then the NEXYGEN-
Plus™ Software User Manual supplied with the software, should be read in conjunction with this
manual. The machine should be connected to the computer with the USB lead supplied. When the
machine is on and ready, the computer connected with the lead supplied, and NEXYGENPlus™ run-
ning, connection between the machine and computer is automatic.
If the LS machine is being used in “stand alone” mode, proceed as follows. The following information
will also be needed for “setting up” the machine with grips, samples etc.
8.2 TEST PARAMETERS
SAMPLE PREPARATION The Jog Keys are used to prepare for a test. The accessories
being used will be dependent on the type of test being conducted.
LOAD CELLS The correct load cell should be tted in the machine for the
application being undertaken. Great care should be taken with
these as they are precision measurement devices and can be
damaged if used incorrectly. Please make sure that you have read
Section 4.3 carefully before proceeding further.
GRIPS/ADAPTORS It is important that grips are tted along the central straining axis of
the machine and that no side loads are applied to the load cell as
this will affect the accuracy of the load readings. The grips should
be connected to the load cell and the bottom anchor pin or xture
using only the pins and parts provided. Care should be taken not
to exceed the load rating of the grips. It is important to ensure that
the grips used are suitable for the material under test. Any slippage
of the material in the grips will affect both load and extension
readings.
EXTENSOMETERS It is important to understand that the extension that the crosshead
moves does not give a true reading of the strain in the samples. If
we consider a dumbbell sample for instance, the strain will be
different at different positions along the sample and no account is
being taken of the take up of slack or bedding in of the grips. For
accurate strain readings we would strongly recommend the use of a
LLOYD INSTRUMENTS extensometer, which is suited for the
material under test.
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