MTS SWIFT 20 Ultra Sensor - Manual (Page 85)

Test Track Vehicle for Slip Ring Sensor
SWIFT 20 Sensors Installing the Transducer 85
Setting up the SWIFT Sensor for Data Collection
Important This section includes information related to the Low-Profile
Transducer Interface (TI). For SWIFT transducers designed to
operate with the newer Mini TI, there is a separate manual that
documents the Mini TI (MTS part number 100214316).
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 introduce extraneous forces or excessive accelerations into the
wheel while rotating it during the Zero process.
Any forces applied to the wheel, tire, rim, spider, or outer portion of the
transducer will cause a Bridge Zero error.
Make sure to apply only a gentle force at a steady rate to the inner hub while
rotating it.
Do not touch or bump the wheel while the transducer is zeroing.
Touching or bumping the wheel will add loads to the transducer, resulting in
an erroneous zero reading.
Avoid all contact with the wheel while the transducer is zeroing. If you suspect that
the zero process is incorrect, begin again
Considerations for
rotating a tire
When using a zero method that collects zero data while the sensor is rotating (i.e.,
algorithm 1 or 3), you must be careful to minimize the forces that are induced in
the transducer’s bridges.
CAUTION
CAUTION