Nortek Vectrino, User Manual

Page: 23 / 42

Vectrino 23
To start the probe check:
1
Make sure the probe is submerged in water.
2 Click Data collection > Start Probe Check .
The four colored graphs correspond to each of the four receive beams.
Graphs are scaled in distance in millimeters from the transmit transducer,
parallel to the transmit beam.
Signal-to-noise ratio:
The signal-to-noise ratio (SNR)
is defined as follows:
SNR 20log
A
A
)
Strictly speaking, some noise
will always be present, so
Amplitude
signal
should read
Amplitude
signal + noise
. However, for
SNR values in the magnitude
applicable to typical Vectrino
situations, the difference is
negligible.
The letters correspond to the following:
A The transmit pulse
B The receive volume
C The bottom echo
The actual sensing volume is a relatively narrow region within the broad
peak indicated by
B .