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3. Non-self identifying and manually calibrated.
If the calibration procedure fails for any reason, the sys-
tem flashes the STRAIN BAL or STRAIN CAL LEDs.
If either of these LEDs is blinking, you must correct the
error before proceeding (refer to page 5-16).
Note
For maximum accuracy of strain measure-
ment, extensometers should be manually cali-
brated over the range of interest, as described
on page 5-22
The following procedures, describing the calibration of
strain gauge extensometers, assume that the devices have
been properly installed and cabled in a Series 4400 system.
Note
An extensometer calibrator with a micrometer
adjustment, such as the Instron High Magnifi-
cation Extensometer Calibrator with a 25 mm
(or 1 in.) range, is required for the manual
calibration procedures.
You cannot start a test while the STRAIN CAL or
STRAIN BAL lamp is lit, and, conversely, the calibra-
tion and balance functions are locked out while a test is
running.
Strain Calibration
5-21
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