3.5 Acquiring Measurements
To further increase accuracy and repeatability, software averaging filters are implemented in the
Garnet. During the measuring process, these filters will take a few seconds to process the data and
therefore the display should only be read once the parameters have stabilised.
3.6 Twist Measurement
The Garnet has the ability to calculate Twist. This is achieved by
comparing the current Cross-levelvalue with the Cross-level value
previously stored by the operator.
The Twist base is undefined and is dependent on the distance separating the two Cross-level
measurements.
The Twist is displayed by pressing the
button when ‘Cross-level is displayed.
Pressing
again will store the current Cross-level value as the new Twist base reference and return
the Garnet to ’Cross-level’ measuring mode.
The first time the Twist screen is entered after a power-up will result in an invalid Twist
measurement being displayed as no base reference has yet been taken!
3.7 Cross-level Rezeroing Calibration
To maintain integrity of Cross-level and Twist measurements, the Garnet should regularly undergo a
Cross-level rezeroing calibration, as described in Chapter 4.2 of this manual. This should be
routinely performed on a daily basis
and
in the following circumstances:-
If the Garnet has had a severe knock
During sudden changes in temperature
If the temperature differs by more than 10
°
C since the last re-zeroing, the garnet will
automatically force the user to start a Cross-level Rezero.
Twist
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