IMPACT SUBSEA
INNOVATIVE UNDERWATER PRODUCTS
www.impactsubsea.com
Document No:
0000.1907 |
Version No: 2.0
| 27
th
June 2022
16
5.3 Calibration
The ISD4000 unit is supplied fully calibrated and should not require further calibration prior to
use. The calibration interval is one year.
The unit can be calibrated using a standard deadweight tester, atmospheric pressure sensor and
the ISD4000 calibration block. The calibration block is available from Impact Subsea.
Using the Impact Subsea Software, a calibration of both temperature and pressure can be
performed on the ISD4000. The software provides a step by step guide to talk the user through
the calibration procedure.
5.4 Magnetic Calibration
For sensors with integrated AHRS, following final physical installation on the vehicle (or other
structure) it is
critical that a magnetic calibration is conducted.
The magnetic calibration takes into account all local hard and soft iron artefacts of the vehicle
(or other structure the ISD4000 is mounted to). This enables the correction of any heading
offsets that permanent magnetic interferers may cause.
If the magnetic calibration is not conducted, the heading will not be correct and will suffer from
non-linear movement when rotated. For example, when operating with inertial mode disabled,
a 90° physical rotation may only be recognised as an 80° rotation.
To conduct a good magnetic calibration, please complete the following procedure. There is also
a video demonstration of this procedure available on the ISD4000 product page of the Impact
Subsea website.
ISD4000 Calibration Block
