MTS Axial Extensometers - Manual (Page 31)

Configuration 31
To install the attachment hooks:
1. Zero the arms of the extensometer. Depending on the extensometer,
this can be accomplished using the zero pin, stop block, or a special
fixture.
2. Using a small adjustable wrench, grasp the sides of the upper arm.
3. While securely holding the extensometer with the wrench, loosen
the socket head cap screws with a hex wrench.
4. Repeat Step 2 and Step 3 to loosen the socket head cap screws on
the lower extensometer arm.
5. Remove the knife edge holddown and knife edge by removing both
socket head cap screws from each extensometer arm.
6. Slide the knife edge between the extensometer arm and the knife
edge hold-down.
• Use straight knife edges for round specimens.
• Use three-point knife edges for flat specimens. Ensure that the
single-point contact knife edge is in the upper arm and the
two-point contact knife edge is in the lower arm.
7. Place the attachment hook between the upper knife edge hold-
down of the upper extensometer arm knife edge.
Hex Wrench
Adjustable
Wrench