Materials Testing Machine
Appendix:
12
012-13762C
•
In the “Properties” window, click the check box for
“Change Sign”
.
•
Click “OK” to close the “Properties” window. Click the
“Hardware Setup” icon in the Tools palette to close the
“Hardware Setup” window.
Calibration Procedure
Reason
The reason for the calibration procedure using the calibration
rod and nut is that the calibration rod will not change shape
significantly under tension or compression. This means that
any displacement measured when the calibration rod is used
is due to the flexing of the Materials Testing Machine itself.
This “flexing” displacement can become part of the calibra-
tion information for the Machine that can be stored in the
Machine.
Mounting the Calibration Rod
To mount the calibration rod for tension, screw the
short-threaded end of the rod into the top of the load cell.
Lower the load bar until the threaded part at the top of the
calibration rod goes through the hole in the load bar. Screw
the load bar round nut onto the top of the calibration rod.
To mount the calibration rod for compression, screw the
short-threaded end of the rod into the top of the load cell.
Screw the calibration nut onto the top threaded part of the
calibration rod until the nut is at the bottom of the threaded
section. Lower the load bar until the bottom of the load bar
rests on the top of the calibration nut.
Load Bar
Round
Nut
Load Bar
(crosshead)
Calibration
Rod
Crank
Handle
Load
Cell
Figure: Mount Calibration Rod for Tension
Calibration
Nut
Figure: Mount Calibration Rod and Nut for Compression
Load
Cell
Load Bar
(crosshead)