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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).
6.5
Distance
Maximum limit on the number of measurements
per recording for Gauge, SE & Twist
Recording Increment
Accuracy
Resolution
6.6
GPS
Accuracy
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 CTMD 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: +15ºC & +25ºC (68OF to 77OF).
8.0
Software Introduction
8.1
Cyclic Top Measurement Device Software
The Cyclic Top Measurement Device software is installed on the Windows device that comes with
the CTMD. This guide explains the important features of the CTMD software that are necessary
for measuring and analysing cyclic top faults.
8.2
Initial Setup
No initial setup is required as Abtus will install the CTMD software and any necessary wireless
drivers. If the Windows device does not connect to the CTMD contact Abtus for support.
14
50,000
0.1, 0.2, 0.25, 0.5 & 1.0 m
±1%
10mm
±2 m (In sunny clear sky conditions)
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