ABT 7100
– Issue 02
14
The default sign convention is: Left rail up is positive Cant/SE.
During geometry measurements the left and right side is determined by the direction of travel.
The user is able to spin the handle around and whichever direction they are walking in, the left
rail up is positive cant.
6.3
Twist
Range
±250mm
Accuracy
±1mm
Resolution
0.1mm
Twist is when one rail has a downward gradient while the other rail has an upward gradient, causing
the carriage to twist. Twist is normally calculated over the bogie length (Traditionally 3m) and the
bogie centre to centre distance (Normally 12m).
6.4
Distance
Maximum limit on the number of measurements
per recording for Gauge, SE & Twist
50,000
Recording Increment
0.1, 0.2, 0.25, 0.5 & 1.0 m
Accuracy
±1%
Resolution
10mm
6.5
GPS
Accuracy
±4 m (In sunny clear sky conditions)
The GPS accuracy varies by time and location thus the user should wait 1
–
2 minutes to achieve the
best accuracy.
7.0
Transportation and Storage
The TGMD must be transported inside its transportation bags. The bags should be moved by two
people following safe manual handling practices. The bags should be stored flat to prevent them
falling over.
If the trolley is not going to be used for several weeks, it is strongly recommended that the batteries
be fully charged and that the trolley be stored away from direct sunlight in a location of low humidity
where the temperature will be between: +15
º
C & +25
º
C (68OF to 77OF).
