MTS SWIFT 10 ATV Sensor - Manual (Page 77)

Road and Track Vehicles
SWIFT 10 ATV Sensors Installing the Transducer 77
Setting up the SWIFT Sensor for Data Collection
To ensure accurate data collection, complete this setup procedure daily before
you begin testing.
The accuracy of the data that you collect depends on the ability of the SWIFT
electronics to “zero out” the forces and angles present in an initial, unloaded
state. During the Zero process, the TI box reads the transducer bridge values and
compensates for any offsets so that the bridge output is 0 at 0.0 V. It also reads
the current angle and compensates for any offset from the Z axis facing up.
You can ensure the success of the Zero procedure by taking these simple
precautions:
Do not touch or bump the wheel while the transducer is zeroing (after you
have pressed the Zero button).
Touching or bumping the wheel will add loads to the transducer, resulting in
an erroneous zero reading.
After pressing the Zero button, avoid all contact with the wheel until the
transducer zeroing at the current angle is complete. If you suspect that the zero
process is incorrect, begin again.
This zero method samples all eight input bridges at four 90° intervals (that is at
0°, 90°, 180°, and 270°). After the data is taken, all eight input channels are
analyzed for signal offsets, and the X and Z input channels are analyzed to
determine the angular zero point.
The following procedure assumes:
• The transducers have been properly installed on the vehicle and the TI boxes
have been connected to the transducers and a power source. See “
Road and
Track Vehicles ” beginning on page 63
• The calibration file for each transducer has been edited, as required, for the
angle mode and polarity, and the calibration files have been downloaded to
the TI boxes. See
“Edit the Calibration File” on page 57.
Zero the TI
When you zero the TI, you want the vehicle to be fairly level and the transducer
to be as close to plumb as practical.
1. Raise the vehicle with a lift or with jacks until each wheel is off the road
surface.
The vehicle should be raised in a level manner, such that the orientation of
the anti-rotate bar is the same in the lifted position as it was in the grounded
position
Note Perform the remainder of this procedure completely for one transducer/
TI box combination at a time.
CAUTION