User's Guide

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Next, multiply the Scale Factor times the Transmitter Gain setting to find
the System Gain setting.
4000 x 0.9802 = 3920
Scroll to the Gain parameter screen on the RX20K and set the System
Gain to 3920. In summary:
Before adjusting full scale output:
4,901 ft-lb = 10.000 V (490.1 ft-lb/volt)
After adjusting full scale output:
5,000 ft-lb = 10.000 V (500.0 ft-lb/volt)
Step 3: Calibrate the Output
There are two ways to perform a calibration of the installation: a
deadweight calibration or shunt calibration.
Deadweight Calibration
The most precise method is to perform a deadweight calibration. This
involves suspending a known mass a known horizontal distance from the
center of the shaft. This is not always practical but does take into
account all possible deviation in the system (actual material properties
versus data sheet, shaft geometry, gage imbalance, etc.) With the
known moment applied, adjust the System Gain until the output is the
same as the calculated torque value.
Using the parameters outlined in the previous example, a deadweight is
applied to the gaged 3-inch shaft that corresponds to 500 ft-lb of torque.
The System Gain would be adjusted until the output was equal to 1 volt.
NOTE: It is recommended that in order to be meaningful, the deadweight
should create a torque load close to those expected during testing. At a
minimum, they should represent at least 10% of the range.
4,901 ft-lb
─────── = Z = 0.9802
5,000 ft-lb