SonTek/YSI
ADVField Software Manual (September 1, 2001) 26
Case F: Damaged receiver arm (Figure 9)
If the sampling volume in one receiver is offset along the horizontal axis, the receiver arm has
been physically bent. Often, bent probes can be repaired quickly and inexpensively by unbending
the arm and recalibrating the probe. Contact SonTek if you have a damaged probe for details
about repair options.
Case G: Excessive noise
If the noise is more than 10 counts above its normal level, it may be a sign that something is
wrong with the probe, the signal-conditioning module, or the cable. The noise level may also be
higher than normal because of external (electromagnetic) interference, or because water has con-
densed on the receiver electronics. Coil any extra high frequency probe cable to minimize the
noise and keep the electronics dry by putting a fresh bag of desiccant inside the conditioning
module.
Case H: High signal strength past the boundary (Figure 10)
If the signal strength does not fall off rapidly past the boundary, the additional acoustic noise can
potentially increase the noise in velocity measurements. This additional acoustic noise is most
commonly seen in small tanks, particularly when built from acrylic or glass. To improve the
situation, cover the boundary with a piece of cloth, a rubber mat, or a sheet of acoustically ab-
sorbing material.
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