DHR Series Getting Started Guide Page 20
The Discovery Hybrid Rheometer (DHR)
The Discovery Series rheometers (DHR-3, DHR-2, DHR-1) are the world's most advanced combined
motor and transducer (CMT) rheometers. The systems consist of a main instrument and a separate elec-
tronics box. The interplay between the rheometer main unit and the electronics is described in “
Key
Rheometer Components” on page 21.
A schematic of the DHR is given in the figure below.
Figure 6 The DHR.
Description
The body of the rheometer is a rigid, single-piece metal casting comprising a base and column.
The instrument head is attached to a ball-slide, which is mounted within the column. The vertical position
of the head is controlled by driving the screw of the ball-slide. The head contains the following:
• The drag cup motor, with an armature that forms the rotating spindle of the rheometer.
• A magnetic thrust bearing that supports the drive shaft and two radial air bearings that align it.
• An optical encoder that determines its angular position.
Each of these components is described in more detail in “
Key Rheometer Components” on page 21.
Motor and bearing
Smart Swap power/signal
connection
Coolant connections
Front panel
Head
Column
Base
Smart Swap accessory
connector
Draw rod
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