Recommended Results

MCR 702 TwinDrive: Increasing the Torque and Normal-Force Sensitivity

Relevant for: MCR 702 TwinDrive, Separate Motor Transducer Mode, Combined Motor Transducer Mode

Introduction

Low-torque measurements are challenging on rotational rheometers, as the instrument is pushed to its limits during these kinds of tests. In the past, the minimum-torque resolution has been an intrinsic limit of an instrument due to the residual friction of the bearing. In today's rheometer generation, the technology has been developed to a level of sensitivity, where disturbances due to environmental factors, including open windows, air conditioners, people in and around the lab, or fluctuating temperatures can actually influence the measurements, particularly at low torque.

Another important factor in low-torque measurements is the averaging method used for data-point generation. The deviation of the results will decrease as the time used for data-point generation and averaging increases. Hence, when comparing the torque performance of rheometers, the conditions for data generation and averaging must be taken into account.

In the following report, the performance of the MCR 702 TwinDrive equipped with two motors is compared to an instrument working with only one motor.

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