Cleveland Motion Controls ULTRA ISC CARTRIDGE TRANSDUCER REV AA - Manual (Page 33)

MAN-70430-0 R EV AA U LTRA S ERIES S TATIONARY S HAFT T RANSDUCER T ECHNICAL M ANUAL
4.12 Proper Practices for Applying Calibration Forces
Seldom is a transducer oriented such that the calibration can be done by simply hanging a true dead weight
from the roll. By generating a tension force that follows the same web path across the roll, you avoid the
necessity of making manual (numerical) calculations to correct for the details of different wrap angle,
transducer orientation, etc.
The following diagrams show you the correct and incorrect techniques to use when applying calibration
forces.
Examples of Inaccurate Wrap Angles
In this example, there was a disregard for maintaining the
correct wrap angle. The dotted line indicates the proper
web path.
In this example, the true web path was difficult to access
and an incorrect path was implemented using a
convenient, but incorrect anchor point.
Example of Correct Wrap angles and Anchor Point
In this example, the anchor point and the wrap angle have
been correctly achieved and closely follow the actual web
path.
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