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Laser Rangefinders I
Calibration of the ProSurvey 1000
Whenever you use the ProSurvey 1000 after storing it for a period, or
in a new environment, calibrate the ProSurvey’s compass. This is
particularly important if you feel that the site in which you are
working is ‘hostile’ in the sense of there being local magnetic field
distortions (for example, a vehicle, pipeline, overhead or underground
power cable, and so forth). The purpose of calibration is to distribute
compass error smoothly through a 360° circle.
Note – The calibration procedure does not modify the compass’s idea
of where magnetic north is. It simply distributes local distortion of the
earth’s magnetic field evenly through a 360° circle. This is important
as it ensures that compass readings are locally consistent. If you want
to account for an error in the compass’s determination of magnetic
north, do this by entering a new value for the Magnetic declination
field in the Asset Surveyor software’s Units and display configuration
form.
Calibration of the compass is quick and extremely simple. Follow the
instructions below:
1. Press the compass calibration control on the side of the
ProSurvey 1000.
This control is a black indented button on the right side of the
unit (looking from the back), above and in front of the laser
trigger.
You are prompted in the head-up display to point the ProSurvey
1000 in approximate directions starting at 0° (due North), then
turning clockwise to 45° (North East) and working around to
315° (North West) in increments of 45°.
2. Point in the indicated direction, wait for a few seconds to allow
the compass to stabilize, and squeeze the laser’s trigger.
After each squeeze of the trigger, the head-up display indicates
the next point of the compass.
TSC1 Asset Surveyor Operation Manual 335