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11.5.4
CALIBRATION
TYPE
Menu Item
The choices for this menu item are:
•
“
TYPE= 2 POINT CAL
” means 2-Point Known Displacement Calibration. You are
prompted to apply the displacements to the transducer that were entered in the
“
KNOWN POINT 1/2
” and “
KNOWN POINT 2/2
” registers. This technique assumes that the
transducer is linear throughout the entire stroke, so the usual displacements used
are zero scale and full scale.
•
“
TYPE= 3 POINT CAL
” means 3-Point Known Displacement Calibration. You are
prompted to apply the displacements to the transducer that were entered in the
“
KNOWN POINT 1/3
” and “
KNOWN POINT 2/3
” and “
KNOWN POINT 3/3
” registers. This tech-
nique can be used to compensate for the different sensitivities that an LVDT may
have on each side of its electrical null. The usual displacements used are zero
scale, half scale and full scale, but you are not restricted to these displacements.
•
“
TYPE= 5 POINT CAL
” means 5-Point Known Displacement Calibration. You are
prompted to apply the displacements to the transducer that were entered in the
“
KNOWN POINT 1/5
”, “
KNOWN POINT 2/5
”, “
KNOWN POINT 3/5
”, “
KNOWN POINT 4/5
” and “
KNOWN
POINT 5/5
” registers. This technique can be used to compensate for the non-linear-
ity in the transducer as well as the different sensitivities on each side of its electri-
cal null. The usual displacements used are zero scale, one-quarter scale, half
scale, three-quarters scale and full scale, but you are not restricted to these dis-
placements.
The selection of the calibration type affects what menu items appear in the
CALIBRATION
DATA
sub-menu.
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