Establish Gauge Length
Gauge length is the distance between the contact points
of the upper and lower grips on the specimen at the start
of a test, and establishes the initial length of the speci-
men. The choice of a suitable gauge length depends
upon the material under test (see Appendix A, Introduc-
tion to Testing). To ensure a uniformity in specimen
length, this spacing must be the same for all similar
tests. This requires that the moving crosshead return and
stop at a preset limit, or gauge length, at the conclusion
of each test.
On Series 4400 systems, gauge length, the current spac-
ing between grips or fixtures, is entered into memory
whenever the G.L. RESET key is pressed. This feature
provides a very accurate gauge length setting.
To set a specific gauge length:
(a) Drive the crosshead up or down, as required, using
the JOG keys on the Frame Control Panel. Use a
ruler to determine the exact spacing between contact
faces of upper and lower grips, or anvil and compres-
sion plate.
(b) Press the G.L. RESET key to enter the gauge length
into system memory.
An alternate method to set gauge length is as follows:
(a) Carefully bring the grip faces (or anvil and compres-
sion plate) together until they just touch, using the
JOG keys.
Establish Gauge Length M10-94400-1
5-28
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