Krystyna Brzezinska (email@example.com), 11/01/2005
Please ask for training to get a password.
Rheometer is a mechanical spectrometer that is capable of subjecting a sample to either a dynamic
(sinusoidal) or steady (linear) shear strain (deformation), then measuring the resultant torque expended by
the sample in response to the shear strain. Shear strain is applied by the motor; torque is measured by the
Dynamic Mode- the motor begins all tests at the motor zero position, and drives symmetrically about
motor zero to the strain commanded by the software. The motor is labeled with graduations indicating 0.1,
0.25, and 0.5 radians from motor zero. The maximum angular deflection of the motor is 0.5 radians from
either side of motor zero.
Steady Mode- the motor can begin a test from any position, rotating clockwise or counterclockwise as
specified by the software.
Choosing a Geometry Size:
1. Assess the `Viscosity' of your sample.
2. When a variety of cones and plates are available, select diameter appropriate for viscosity of sample
- low viscosity (milk)- 60 mm geometry
- medium viscosity (honey)- 40 mm geometry
- high viscosity (caramel)- 20 mm geometry
3. Examine data in terms of absolute instrument variables [torque/speed/displacement] and modify