Strain gauges for humid environments
Called CHA, the improvement is scored under the ASTM-5229 ‘Standard test method absorption properties and equilibrium conditioning of polymer matrix composite materials’ because the parts are intended for application such as humidity-conditioned composite materials.
They com in several uniaxial, tee rosette and rectangular rosette configurations (see photo) and include a cast polyimide backing for flexibility and toughness, and have integral copper coated tabs for flying lead connections.
Operation is over –75 to +175°C and a strain range of ±3% for all lengths (5% for gauge lengths of >6.4mm). Fatigue life is ±1500microstrain for 106 cycles.
All are 350Ω ±0.6%
The website is here.
There is a video showing how to instrument a mug (using a CEA series gauge) before dropping it on to concrete.
Micro-Measurements is part of Vishay Precision Group.