LS SERIES SERVICE MANUAL
ISSUE 4.0 CALIBRATION PROCEDURE 1
9. CALIBRATION PROCEDURE
9.1 General
The following procedures should be carried out annually to maintain the machine at optimum
accuracy and also to comply with local load verification standards, if required.
9.2 Checking the Extension Measurement
The crosshead extension cannot be adjusted, but the accuracy may be checked by using an
engineers rule.
1 Remove any grips then set the lower limit pointer to its lowest position.
2 Move the crosshead down until it is almost at the bottom of its travel. Press the ZERO key
and check that the extension display shows zero.
3 Measure 400mm (Standard height machines) or 700mm (Extended height machines) from
the top of the actuator bar on the moving crosshead and mark this position with a soft
pencil etc. on the side of the vertical column.
4 Move the crosshead up until the top of the actuator bar is in line with the mark.
5 Check that the extension reading on the console is 400mm or 700mm +/- 1mm.
6 Press the RETURN key and check that the crosshead returns to the original position and
that the display shows zero.
9.3 Checking the Crosshead Speed
The crosshead speed cannot be adjusted, but the accuracy may be checked by using a stop
watch.
1 Remove any grips then set the upper and lower limit pointers to the top and bottom of the
scale.
2 Move the crosshead down until it is almost at the bottom of its travel. Press the ZERO key
and check that the extension display shows zero.
3 Measure 250 mm from the top of the crosshead and mark this position with a soft pencil etc.
on the side of the caseware.
4 Select 250 mm/min test speed.
5 Start the machine and check the time taken for the crosshead to reach the upper mark. This
should be 60 seconds + / - 1 second.
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