System Operation
3.11.1 CALIB
Button
Calibration is performed automatically upon power-up. Calibration may also be
performed at any time by clicking the CALIB Button. This initiates a process
which calibrates the electronics associated with each of the ceramic elements
that constitute the receiver array. A highly accurate tone generator in the sonar
head injects a tone of known amplitude and phase into the receiver channels.
This calibration signal is received, the processor generates a lookup table of both
gain and phase offsets by comparing the received signal to that transmitted. All
subsequent signals from that channel have these offsets applied to them before
further processing. This compensates for minor inconsistencies in the analogue
receiver channels.
NOTE
To ensure proper auto-calibration, do not power up, reboot, or calibrate the sys-
tem when the Sonar Head is being deployed or retracted, as any mechanical
noise may affect the measurements.
3.11.2 RESET
Button
A single-click on the RESET Button reboots the firmware in the sonar processor
and initiates a calibration routine.
3.11.3 Wet-End
Status
This status block displays the status of monitored Sonar Head items.
Leak:
Shown as a voltage value, the leak sensor indicates the
presence of water in the head. If the indicated value falls
below 3.8V the BITE button will turn RED. The system
should be shut OFF immediately and the Sonar Head
removed from the water.
HeadTemp:
Shown in degrees C, this is the temperature inside the
Sonar Head.
-5V:
The voltage shown is the measured value of the -5VDC
power supply in the Sonar Head. The displayed value
should be close to -5 volts.
+12V:
The voltage shown is the measured value of the +12VDC
power supply in the Sonar Head. The displayed value
should be close to +12 volts.
-12V:
The voltage shown is the measured value of the -12VDC
power supply in the Sonar Head. The displayed value
should be close to -12 volts.
DipSwitch:
This number is the HEX value of the sonar head configu-
ration dip switch. This is a factory setting.
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SeaBat 8101 Operator's Manual
3-18
Version 3.02
