Topcon 1004089-01 - 3.5.6. Mounting bias calibration

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Chapter 3 – Tuning Preparation

3.5.6. Mounting bias calibration

Mounting bias refers to the offset from horizontal at which the GPS

receiver is mounted on the roof of the vehicle. The following things

can affect and change the mounting bias:

 Tire pressure

 Track tension

 Dual tires

 Tire sizing

 Cabin suspension

 Cabin repairs (suspension and mounts)

 Removing and refitting the receiver

 Mounting location has moved

Note: Mounting bias calibration should be performed if any of the

above change or at a minimum once every 6-12 months.

Note: It is advisable to still perform a mounting bias calibration when

using Autonomous as the Correction Source (System / GPS /

Correction), even though the console reports that it is not required.

Mounting bias calibration is performed in a clear, flat area well away

from obstacles. If the mounting of the receiver is not quite level, this

calibration will adjust for the actual position.

WARNING: Ensure the vehicle has sufficient space to

travel in a straight line for at least 70 m/230 ft and then

turn at each end of the wayline.

1. From the calibration screen, select the mounting bias calibration

option:

 X30: MOUNTING BIAS

 Universal terminal:

Note: To calibrate for mounting bias, ‘A’ and ‘B’ wayline points

are plotted over 70 m/230 ft, driving the vehicle at 2 kph or