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(c) Clamp the extensometer onto the calibrator spindles
at gauge length, as described in the manual supplied
with the extensometer. Allow up to 15 minutes for
the extensometer to stabilize after applying excitation.
(d) Press the STRAIN BAL key. The STRAIN BAL
LED lights.
(e) Press ENTER. After about 3 seconds, the STRAIN
BAL LED goes out, indicating that the balance func-
tion is completed.
(f) Press the STRAIN CAL key. The STRAIN CAL
LED lights. Go to Step 1 or 2 below.
(1) If the extensometer is a self-identifying type, the
Main Panel Display shows the maximum strain
(%) or range (mils or mm) of the extensometer.
Do not press ENTER.
(2) If the extensometer is a non-self identifying type,
the Main Panel Display is blank. Key in the maxi-
mum strain (%) or range (mils or mm) of the ex-
tensometer on the keypad. Press ENTER. The
STRAIN CAL LED stays lit.
(g) Adjust the calibrator by one of the following meth-
ods:
Note
Adjust calibrator carefully. Do not turn it past
the set point and have to reverse, as backlash
will cause an error.
(1) To calibrate the extensometer over its maximum
strain (or displacement) range, adjust the calibra-
tor to a displacement value which corresponds to
Strain Calibration
5-23
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