Instron AVE2 - Page 74

Chapter: Set up Bluehill
®
3 software
74 M16-16905-EN
5. If you are using the 6mm lens, you must use two calibration bars to accommodate
the large field of view, as follows:
a Install one calibration bar in the upper grip, making sure that the matrix of dots
faces towards the extensometer.
b Install one calibration bar in the lower grip, making sure that the matrix of dots
faces towards the extensometer.
c Move the crosshead so that the upper bar is near the top of the field of view and
the bottom bar is near the bottom of the field of view. Make sure, however, that
the bottom bar is at least 50mm above the bottom of the field of view to optimize
accuracy.
6. Select Calibration.
The dialog moves to the Calibration screen.
7. Remove the red lens cover (AVE2 only; there is no lens cover on the SVE2) by gently
pulling it away from the lens.
8. Follow the instructions in the calibration dialog to select and focus the lens.
a Select the lens that you have installed from the drop-down list.
b Focus of the lens until the check mark appears, then lock the thumb screw.
9. Replace the red lens cover (AVE2 only).
10. In the image window in the Calibration screen, drag the dotted center line so that it
is in the center of the dot matrix pattern.
11. Draw a box around the area of the dot matrix that you want to calibrate. The border
of the box displays green.
If you are using the 6mm lens, draw the box so that it includes both calibration bars.
12. Select Calibrate.
13. When calibration is complete, the calibration status updates and a yellow box
appears indicating the region in the field of view that generates the highest accuracy.
You should ensure that the dots defining the gauge length on each specimen are
within this yellow box at the start of each test.
14. Select AVE2 (or SVE2).
The dialog moves to the AVE2 (or SVE2) screen.
15. Remove the calibration bar from the grips.
16. If you are using the video extensometer on an 8800 or ElectroPuls testing system
with an 8800T or 8800D controller, you now need to manually calibrate the exten-
someter in 8800/ElectroPuls console. As part of the manual calibration, set the
transducer type to Strain (Calibration wizard > Transducer details screen). For more
details refer to “Using the AVE2 with an 8800T or 8800D Controller” in the Console
online help.
The strain transducers for the video extensometer are now calibrated.