Electrical Calibration of Self Identifying Strain
Gauge Extensometers
Note When electrically calibrating a 2630 Series
self-identifying strain gauge extensometer, the
balance operation is performed automatically.
To electrically calibrate a 2630 Series self-identifying
strain gauge extensometer:
(a) Clamp the extensometer onto the specimen at gauge
length, as described in the manual supplied with the
extensometer. Allow up to 15 minutes for the exten-
someter to stabilize after applying excitation.
(b) Press the STRAIN CAL key. The Main Panel Dis-
play shows the maximum strain (%) or range (mils or
mm) of the extensometer, and the STRAIN CAL
LED lights.
(c) Press ENTER. After about 6 seconds, the STRAIN
CAL LED goes out, the display goes blank and cali-
bration is completed.
Manual Calibration of Strain Gauge Extensometers
To manually calibrate a 2630 Series self-identifying, or
non-self identifying, strain gauge extensometer:
(a) Mount spindles on the calibrator that fit the exten-
someter clamps, and set the calibrator in a vertical po-
sition for greatest accuracy.
(b) Adjust the calibrator for minimum displacement
(gauge length). Minimize backlash in the mechanism
by going through the zero point and then return.
Strain Calibration M10-94400-1
5-22
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