MTS Model 632-85 Biaxial Extensometer - Manual (Page 7)

Model 632.85 Biaxial Extensometer Introduction 7
The extensometer is designed with multiple flexures for the necessary degrees of
compliance to provide for a secure, determinant attachment to the test sample.
This unique patented flexure design (covered by patent number 4,527,335)
provides approximately equal contact force to be transmitted by each of the four
conical contact points. Thus, the extensometer maintains positive contact even
with a somewhat nonuniform test sample or one which deflects somewhat
nonuniformly under static or dynamic loading.
Option 001 provides an averaged axial output to a dc conditioner. This
extensometer consists of a half Wheatstone bridge in each of the two axial sensor
units to measure the axial deflection of the specimen and a full Wheatstone
bridge in the transverse sensor unit to measure the transverse deflection of the
specimen. The two half bridges are output-matched (to within 1% of each other)
and combined into a full bridge to provide a single averaged axial output which
can be conditioned by a single dc controller or dc conditioner. The transverse
sensor unit uses a full Wheatstone bridge to measure the transverse deflection.
Two dc conditioners with their associated calibrated ranges are required to
condition the output signals from this unit.
Option 002 provides a dual axial output to the dc conditioners. This extensometer
contains a full Wheatstone bridge in each of the two axial sensor units to measure
axial deflection on both sides of the specimen independently. The transverse
deflection is also measured by a full Wheatstone bridge in the transverse sensor
unit. The output of each gage is cabled directly to its respective dc conditioner.
This configuration is particularly useful when it is necessary to measure bending
strains on the specimen. Three dc conditioners with their associated calibrated
ranges are required to condition the output signals from this unit.
Specifications
Parameter Specification - 632.85F-05
Specimen size range
Flat specimen
*
Dimension (R):
Dimension (S):
Round specimen
Diameter
Travel
Axial:
Transverse:
Axial gage length:
Accuracy (ISO 9513):
Temperature range:
Contact force of each contact on
specimen at mid-transverse
range:
* Specimen size range dimensions correspond to those shown in
previous figure.
0.5 to 51 mm
1 to 34 mm
3 to 34 mm
+1.2 to -1.5 mm
+/- 0.5 mm
25.00 mm
class 0,5
-100
°
C to +150
°
C
700 grams