FLIR Ranger HRC MS - IR image

Ranger HRC™ operator´s manual – Basic settings
Publ. No. TM 614 006 699 Rev B – ENGLISH (EN) – Oct 30. 2008 129
10.3 Home position
There are two positions to park the system at, the home position and the
mechanical home position.
The home position is dened by a DMC calibration or by manual set-
ting. The DMC calibration is used to set the home position to true north.
Manual setting is used to set the home position to a specic target, for
example a gateway or an entrance door. When the PRK button is pressed
< 1 second, the system moves directly to the home position.
When the system is in the mechanical home position, the cameras and
sensors are directed straight forwards. The system is sent to the mechani-
cal home position when the PRK button is pressed > 1 second. This posi-
tion is recommended before the system is turned off.
10.3.1 DMC calibration
The DMC calibration is used to set the home position to true north.
The DMC unit establishes the direction to magnetic north. In order to
nd true north, the local magnetic declination between magnetic north
and true north must be entered into the system before the DMC calibra-
tion is started. A negative number corrects toward west and a positive
number towards east.
In order to nd magnetic north, the Digital Magnetic Compass DMC)
unit measures the geomagnetic eld. It is important that the system is
placed away from any sources of magnetic interference, which may in-
terfere with the measurement and spoil the result. Devices like trans-
formers, motors, radars, power lines etc. emit powerful elds which can
have severe impact on the reliability of the readings. Also larger masses
of certain materials such as iron will have an impact. For instance, a steel
vehicle like a tank close to the system may create large deviations.
For information about the operation of the DMC unit, see section 3.1.5.
NOTE: The IR Camera shall be turned off during the DMC calibration, to avoid magnetic
interference.
NOTE: The Azimuth value in the Setup – Pan/Tilt dialog box will automatically be ad-
justed to correspond with the magnetic north reading of the DMC unit. Hence, a DMC
calibration will replace any previous true north or manual setting of the home position.