MTS Axial Extensometers - Manual (Page 36)

Configuration 36
The following procedure describes a typical gage length extender
installation. Actual installation may vary, see the installation drawing
accompanying the gage length extender for specific details.
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. Remove the existing knife edge hold-down or quick attachment
adapter from the upper arm of the extensometer. Take care not to
loosen the spring attachment hooks and knife edges.
Note A knife edge hold-down and spring attachment hook for small
diameter specimens is already attached to the gage length
extender.
3. Attach the gage length extender to the upper arm of the
extensometer using the socket head cap screws provided in the kit.
4. Install the knife edge hold-down to the top of the extender.
• If you are using metal extension springs or elastic bands, the
knife edge hold-down has a spring attachment hook mounted
to it.
• If you are using quick attachment springs, the knife edge hold-
down may be part of the quick attachment adapter.
5. Follow the appropriate procedure to recalibrate the extensometer.