To ensure accurate experimental results, calibrate the rheometer upon initial installation. For best results, recalibrate the rheometer periodically. Note that calibration procedures vary. The table below lists required calibration/verification tasks and the recommended interval for each, as well as when to perform calibrations following a transducer replacement.
For information on temperature systems calibration, refer to DHR/AR Temperature Calibration.
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Calibration Task |
Calibration Interval |
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Suggested: At least every 3 months. |
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Suggested: As the torques in your procedure drop, the error from an unmapped bearing will increase, so it is necessary to perform mapping to keep these errors to a minimum. For the AR Series: For maximum accuracy at the lower torque end of the rheometer, it is recommended that the mapping be performed each time a new measuring system is used, or if the current geometry is removed for cleaning. For the DHR Series: Provided that the geometry is refitted in the same position (see Fitting a Geometry on the DHR) and the geometry has previously been mapped, the re-mapping is not necessarily required unless low torque or creep recovery tests are being performed.
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Suggested: Use oscillatory mapping to get the best data at low torque, low displacement, and especially low torque and low displacement. |
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| Axial Mapping | Suggested: Every time the instrument is set up to run DMA experiments. |