MTS Model 632-85 Biaxial Extensometer - Manual (Page 12)

Model 632.85 Biaxial Extensometer 12 Installation
1. Ensure the zero set pins are installed in the extensometer (refer to above
figure).
2. Slightly loosen the socket head cap screws which secure axial sensor unit B
to the positioning arm.
Note For specimens where the R dimension (refer to the specifications
section) is greater than 1.1 in. (28 mm), perform steps 3 through 5 to set
the extensometer transverse gage length. If the specimen has a R
dimension less than 1.1 in. (28 mm), proceed to step 6.
3. Remove the two socket head cap screws which secure the slide bracket to
the axial sensor unit B compliance flexure.
4. Slide the slide bracket off from the positioning arm. Turn the slide bracket
180° and slide it back onto the positioning arm. Note that the section of the
slide bracket which was secured to the top of the compliance flexure will
now be secured to the underside of the compliance flexure.
5. Place the compliance flexure in place on top of the extended side section of
the slide bracket. Replace the socket head cap screws removed in step 3 to
the underside of the slide bracket. Secure the slide bracket to the compliance
flexure by tightening the socket head cap screws.
6. Insert the zero set spacer behind the mechanical stop of the transverse
sensor. The zero set spacer is designed to hold the transverse output to zero
volts. Measure the transverse conditioner output and verify that the
conditioner output is 0 V± 2 V.
Note The extensometer might want to swing and twist very thin specimens. To
restrain the extensometer, connect a string between the grip pad and the
load frame column.
7. Slide the axial sensor unit B along the positioning arm until the conical
points contact the specimen. Hold the extensometer in position and tighten
the socket head cap screws.
8. Remove the zero set spacer installed in step 6.
9. Adjust the placement of the conical points on the specimen to
align the upper and lower contact points on the vertical center
line of the specimen.
13 Overtravel stop plate
14 Conical point contact
15 Conical point vertical adjustment
16 Zero set pin
Item Description