Features
Sturdy, compact, self contained bench top unit for determining the surface strains and deflections of a  flexible diaphragm under varying pressures. An aluminum diaphragm is clamped rigidly around its  outer edge, creating a volume underneath its surface into which oil is filled. On the top surface of the  diaphragm are attached 8 precision strain gauges at differing orientations. Round Diaphragm  Apparatus diaphragm is flexed, the strain gauge output is fed into a digital display,  which is supplied.
The force applied to the diaphragm is created by pressurizing the oil underneath the diaphragm using  a fine adjustment control mechanism. An analogue pressure indicator monitors the pressure, whilst  an electronic pressure sensor monitors the same pressure but  gives an output signal to the digital  display. 

Specifications
1.     Apparatus for determing surface strain and deflection of flexible diaphragm 
2.     To have strain gauge attached to surface
3.     To utilize digital dial gauge for recording surface deflection and profile of diaphragm
4.     Diaphragm pressurized causing deflection and surface strain
5.     To have fine pressure adjustment for adjusting applied pressure to diaphragm
6.     Digital display for strain, pressure and deflection values
7.     Data acquisition software for key experimental     parameters, Optional 

Experiments
1.     Measurement of diaphragm disc surface strain using strain gauges 
2.     Measurement of diaphragm disc deflection with a dial gauge 
3.     Determination of radial strain 
4.     Determination of circumferential strain 
5.     Diaphragm surface profile 
6.     Strain gauge technology and uses 
7.     Comparison of actual and theoretical results 
8.     Mohr Circle