Set Crosshead Speed
The testing (crosshead) speed you select depends upon
the type of material being tested. Some examples of typi-
cal speeds are given in Appendix A, Introduction to Test-
ing. Usually, a testing rate is specified as one of the
following:
• Specimen strain rate in inches per inch per minute
(or mm/mm/min).
• Percentage of specimen extension or compression
per minute.
• As crosshead speed in inches (or mm) per minute.
When selecting a crosshead speed, you should consider the
following:
• Characteristics of the specimen material.
• Total elongation or compression of specimen during
the test.
• Maximum speed of recorder response.
To maintain speed accuracy in a Series 4400 system, do
not exceed the maximum speed at the crosshead loading
shown in the specification for the load frame.
Note
If a crosshead speed is entered beyond the
specified maximum range of the Series 4400
system, it is not accepted. The maximum
speed for the system is automatically set.
Set crosshead speed as follows:
(a) Press the SPEED key. A number appears on the Main
Panel Display (either the default value or a pre-
viously set speed appears).
System
Operation
Set Crosshead Speed
5-35
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