YSI ADV6600 - Manual (Page 52)

Section 4. Calibration and Diagnostics
ADV6600
Y S I
Environmental
Page 42
indicates that (a) Doppler pulses are being sent out properly from the transmitter and (b) all three
receivers appear to be working properly.
For the second experiment, the sensor was manually raised in the bucket such that the transmitter
and receivers were about 25 cm (10 inches) from the bottom of the container and the following
display was observed:
The key to understanding this display is to remember that the sensor is now in a position such that
the sampling volume is well above the bottom of the bucket. Therefore, reflection of the acoustic
pulses scatterers in the sampling volume are observed at a larger x-axis value than in the previous
experiment. Note that reflections from the bucket bottom are still observed, but at a much larger x-
axis value (farther from the receiver arms). Thus, the Beam Check pattern can be readily explained
using a basic knowledge of the sensor technology. As for the other experiment, it is important to
note that the amplitudes (intensities) of the three signals are approximately equal and this indicates
that (a) Doppler pulses are being sent out properly from the transmitter and (b) all three receivers
appear to be working properly.
4-2.6. Beam Check Feature Summary
To view real-time, ADV6600 beam check data, first select Beam Check from the Tools and
Utilities List. Then use the following commands to fine tune the presentation.
• Click Start. This action will establish communication with the selected instrument and start
the display of data.
• Use the menu and control items to alter the display of data as desired.
• Click Stop to end the display of data.
• Use File|Exit to close the Beam Check window and return to ADVantage 6000.
Reflection from scatterers in
sampling volume
Reflection from bucket
bottom with sensor 25 cm
above surface