Instrument Reference 3
Agilent Nano Indenter G200 User’s Guide 3-8
Simple contact points are added to the end of the torsion-bar cantilever
and the loading element, so that upon contact between the torsion bar
and the loading element a circuit is completed. Once the contact
between the torsion bar and the loading elements is recognized, load is
applied by applying torsion to the bar. Unloading is accomplished by
releasing the torque on the torsion bar. When the contact-recognition
circuit is broken, the cantilever is moved away from the loading
elements.
Refer to Appendix C, "High Load" for more information.
Indenter
The most common geometry for the diamond tip used with the
indentation head is the Berkovich indenter. Shown in
Figure 3- 10, the
Berkovich indenter is a three-sided pyramid with the same aspect ratio
as the Vickers indenter. Any diamond indenter geometry that is desired
can be used with the indenter head, provided that the diamond mount is
configured to fit into the indenter shaft.
Figure3- 10Diamond indenter with Berkovich geometry
Available tip geometries include conical, Knoop, Vickers, and wedge.
Contact Agilent for more information about alternative diamond-tip
geometries. Also, see
Changing the Indenter in Chapter 6, "Commonly
Used Procedures".
Isolation Cabinet
The G200 isolation cabinet (Figure 3- 11 on page 3-9) features a
laminate exterior and a foam interior. The isolation cabinet is used to
retard environmental temperature changes and dampen acoustic
disturbances. The closed (and sealed) cabinet provides a stable air mass
in which sudden temperature changes are minimized. The foam lining
on the interior of the cabinet absorbs acoustic energy and decreases the
transmission of such excitation to the instrument. The fixed cable ports
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