TA Instruments AR 2000, Operator'S Manual

Page: 99 / 144

AR 2000 Operator’s Manual 99
9. At a gap of about 20 mm between the shoulder on the
rotor assembly and the underside of the upper magnet
assembly the magnets in the upper assembly will
engage with those in the rotor assembly as shown in
Figure 8.19. (A small noise will be heard when this
happens and a change of a few Newtons will be seen
in the normal force reading.). Immediately stop mov-
ing the rotor assembly down and remove the small
magnet.
10. Lower the instrument head to the geometry gap
(default 3500 µm). Do not zero the gap.
Figure 8.19
Magnets Engaging