SonTek, a Xylem brand
RiverSurveyor S5/M9 System Manual (February 2013)
35
changed in post-processing. Below is an explanation of the fields for the Measurement Settings
window.
• Start Edge – Sets the default starting edge for discharge measurements (right or left
bank).
• Rated Discharge – Enter a rated discharge pre- or post-measurement. This infor-
mation is useful for post-processing data analysis and evaluation.
• Measurement Quality – Used as a post-processing qualitative input to evaluate the
discharge measurement quality.
Figure 33. Measurement Settings Menu
6.9. Pre-Measurement Tests and Utilities
The steps described below are used to test the RiverSurveyor hardware prior to making a
measurement. The pre-measurement tests should be done prior to each discharge measure-
ment to ensure the functionality of the RiverSurveyor hardware for proper data collection.
6.9.1.
Compass Calibration
A compass calibration is necessary prior to each discharge measurement to compensate for
magnetic fields specific to the site. To perform a compass calibration, click the Compass Cali-
bration link and click Start in the pop up window or Open to load an existing calibration file
(Figure 34).
• Complete two horizontal rotations with pitch/roll values equal to or greater than expected
measurement conditions. The required duration of the compass calibration is between 1
and 2 minutes.
• The compass calibration and the measurement location should have similar magnetic
properties and not vary during the calibration or measurement.
• The compass calibration and the measurement location should be away from large fer-
rous objects above/below the water surface (i.e. reinforced concrete piers or bridges,
large metal boats/buildings, pipelines, large ships, etc…).
• Before calibrating the compass, remove all small ferrous objects (i.e. hand tools, cell
phones, keys, etc…) from the vicinity of the instrument.
• The magnetic influence should be constant during calibration and measurement.
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