MTS WIFT Mini Transducer Interface - Manual (Page 26)

SWIFT ® Mini TI 26
Transducer Interface
Hardware Overview
The angle output for a tire rotating at constant velocity can be represented by the
following illustration:
Although you may not routinely use it, the angle output information is available
for tasks such as tire uniformity testing and troubleshooting.
If using the sawtooth angle output for analysis, care should be taken when setting
the data acquisition to avoid filter-induced ringing or attenuation of the sawtooth
output.
High-Resolution
Velocity Algorithm
The Mini TI has two algorithms for calculating angular velocity. The high
resolution algorithm provides a much cleaner signal, but requires a minimum
Mini TI FPGA version of 15. For the high resolution algorithm, the plot below
shows the expected ripple of the angular velocity signal as a function of actual
angular velocity.
The low resolution velocity algorithm produces significantly larger ripples on the
angular velocity signal. These ripples can be reduced by enabling a filter at the
input of data acquisition system. For more information on the angular velocity
output option, contact MTS.
Communications
The TI uses USB 2.0 for communication. The MTS supplied USB drivers must
be installed on each computer you connect to the TI.
0 360°
5V
0° 360°
q
Angle
Output
1 rev = 360°
S20-10