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Properly placed calibration unit
Open the calibration dialog in the
RetroGrabber software. Make sure
that “R
L
Calibration Standard
” is the
reference value of the calibration
unit. Change that value in the Setup
if necessary. Press Calibrate.
The calibration process takes a
couple of seconds. Accept the
calibration if the deviation does not
exceed 5 %.
Otherwise, discard it. Make sure the
measuring head is levelled correctly
and reposition the calibration unit as
described above. Repeat the
calibration.
Open the measuring window and
check R
L
. It must be within a digit or
two of the reference value.
