Thermo Scientific HAAKE RotoVisco 1 Instruction Manual page 49

Operating
Other options on the device record card are:
Torque Compensation
When the torque compensation is activated, the present
value of the torque display is set on zero "0" right before the
measurement so that possible faults (offset faults) can be re-
duced. This is always advisable when samples without "yield
point" are to be measured. In case of doubt it is measured
first without "Torque Compensation" and after that it is de-
cided whether the function can be used.
Inertia of Masses Correction Ramp
If fast speed ramps (< 180 s) are driven, the dampening set
at the sensors (usually 30%) and also the inertia of the
masses of the measuring device (motor and rotor) enter the
result. Fast ramp speeds make up a hysteresis curve which
does not come from the sample but from the test conditions
and the measuring device. The influence can be seen quali-
tatively in the following diagram. It is recommended to drive
measurements with ramp times of less than 120s without
correction only in special cases. With correction, the in-
fluences of the inertia of masses are compensated. This can
be tested individually at examples relating to practice.
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