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Strain Calibration
Strain Calibration
Overview
Strain measurement on the Series 4400 system makes
use of an optional Strain Sensor Conditioner board. This
Strain channel can accept a wide variety of strain
transducers, including strain gauge extensometers,
LVDT extensometers, Crack Opening Displacement
gauges, and several types of specialized extensometers
for specific applications.
The functions of the Strain channel are similar to the
Load Sensor Conditioner described in Chapter 4. The
output is either an unranged, or an automatically ranged,
0 to 10 Vd.c. full scale strain signal. The strain signal can
be monitored during a test, can be used for X-Y recording
of load-strain data, can be used with strain limits to control
crosshead action, and can be used in a printout obtained of
peak, break and preset point values.
Strain Operating Mode
The operating mode for the Strain channel can be set to
either Percent Strain (%) or, depending on the type of ex-
tensometer, to displacement in inches or millimeters.
Note
To change the strain operating mode, you must change
the setting of a DIP switch on the rear of the console.
This switch is part of a three-section DIP switch located
between the rows of cable connectors at the lower rear
5-18
Always be aware of the strain operating mode
when monitoring the signal, when setting up for
strain recording, and when using strain limits.
M10-94400-1
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