SonTek RS5 User Manual (August 2020) 74
discharge calculations will be affected in the field. These values can then be modified in
post-processing. Each setting in the System Configuration is described in detail in the
following sections.
7.5.5.1 Transducer Depth
Transducer depth is the distance that the vertical beam transducer is submerged below
the water surface. Figure 52 shows a basic diagram that depicts an ADP’s transducer
face submerged in water. Transducer depth corresponds to the depth of water that the
transducer face is submerged.
Figure 52. Transducer Depth
7.5.5.2 Screening Distance
Screening distance is the distance below the ADP face at which the user wishes to
begin the velocity profile rather than using the default setting of the instrument. This is
primarily used for boat mounted applications where the screening distance can be set to
avoid flow disturbance from the wake of the boat. An accurate Transducer Depth is
required, and the final depth for the instrument to begin profiling is:
Profile Starting Depth = Transducer Depth + Screening Distance
7.5.5.3 GPS X/Y Offset
When the RS5 is mounted on the Hydroboard II-Micro (described in Section 3.4), the
GNSS/GPS antenna is located directly above the RS5 system. In the case where the
antenna is not located directly above the RS5, a GPS X/Y offset must be entered to
ensure proper location of the track with respect to the instrument and the site geometry.
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