General Characteristics
The Series 4400 control system is made up of two major
subsystems: a crosshead drive and control system, that
applies tensile or compressive loading to a specimen;
and a highly sensitive load weighing system, that meas-
ures the loading of a specimen. Figure 1-1 is a functional
block diagram showing the interfacing of these two sys-
tems, and the signal flow within the overall instrument.
During a test, results occur as tracked (instantaneous)
values of load, extension and strain or, after a test, as
stored break and peak values of these parameters. Total
energy and load and energy values at preset points are
also available as stored parameters. Several choices of
analog and digital output devices are available as op-
tions for viewing and recording test results.
The control console provides control, data acquisition
and data readout functions for the load frame. All opera-
tions are directed by a microprocessor-based central
processing unit (CPU). The crosshead control network
allows programmable crosshead speeds and provides
digital control of the crosshead position. The operating
mode of the console data entry and readout functions
can be in English, metric or SI units, as selected by a
switch. A status indicator on the main panel shows the
system of units selected.
The action of the moving crosshead during a test - stop,
return, or cycle - can be controlled manually by pushbut-
ton switches, or automatically by the functions provided
by the Limits feature. These functions may be based on
the applied load, extension or strain, or to a detected
specimen break.
General Characteristics M10-94400-1
1-4
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