3-3
Calibration
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3. Bring the carriages together until they just touch.
4. Hold both carriages in position whilst releasing the upper arm by slackening the
(vertical adjustment) thumb nut at the rear of the arm.
5. Position the upper knife edge in the upper gauge length notch in the calibration bar.
Tighten the thumb nut.
6. Check that the carriages are just touching and that the arms are parallel, and not bending
either towards or away from each other. If necessary, repeat the above procedure.
Calibration
Calibration of the long travel extensometer depends on the test machine, controller and
software being used:
5800 Controller
1. Plug in the extensometer.
2. Set the gauge length using the calibration bar supplied (see page 3-2).
3. Use the Console software calibration wizard.
Refer to the Console Operating Instructions or the online help for more details.
The carriages and clamp assemblies are each counter-balanced by weights mounted
inside the support tubes. When the arms are released during the gauge length procedure,
the counter-balance arrangement is temporarily upset, so to prevent the carriages from
flying away - hold them with one hand whilst positioning and securing the clamp arms with
the other hand.
When setting small gauge lengths, ensure that the lower arm does not bridge across the
carriages.
The long travel extensometer is a variable gauge length device and as a consequence
Console reverts to AC High Input. For correct calibration, configure the extensometer as AC
Low input.
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