Overview Of Normal H-Adcp Operation; Functional Description Of Operation; Input Power - Teledyne WORKHORSE Operation Manual

May 2015

Overview of Normal H-ADCP Operation

Refer to Figure 40 through Figure 42. The following events occur during a typical data collection cycle.
1. The user or a controlling software program sends data collection parameters to the H-ADCP. The
user/program then sends a CS-command to start the data collection cycle. The firmware program
stored in the CPU microprocessor takes control of H-ADCP operation based on the commands re-
ceived through the serial I/O cable.
Figure 40 shows a flow chart of the wake-up logic used by the H-ADCP. The H-ADCP determines
what to do based on where the wake-up came from (a Break, CS-command, battery saver timer, or
watchdog timer was detected).
2. On the PIO Board, the POWER REGULATOR circuit sends a transmit command to the POWER
AMPLIFIER circuit. This tells the H-ADCP to start acoustic transmissions (pinging) on all
TRANSDUCERS.
3. The TRANSDUCERS receive echoes from the backscatter. The RECEIVER board amplifies and
translates the echoes into a base-band frequency.
4. The CPU board processes the received echoes.
5. After echo reception, the H-ADCP injects a self-test signal into the RECEIVER board and process-
es the signal as normal data for test purposes.
6. The THERMISTOR measures water temperature at the transducer head and sends it to the CPU
via the DSP Board.
7. The PIO Board sends pitch and roll from the TILT SENSOR and H-ADCP heading from the
COMPASS to the DSP Board. The DSP Board digitizes this information and sends it to the CPU
for processing.
8. The CPU repeats steps "b" through "g" for a user-defined number of pings. The CPU averages the
data from each ping to produce an ensemble data set.
9. At the end of the ensemble (sampling) interval, the CPU sends the collected data to the serial I/O
connector or PCMCIA recorder.

Functional Description of Operation

The following paragraphs describe how the H-ADCP operates and interacts with its modules. Refer to
Figure 40 through Figure 42 throughout this description.

Input Power

The H-ADCP Monitor/Sentinel requires a DC supply between 20 volts and 50 volts. Either an external DC
power supply or internal battery packs can provide this power. Figure 41 shows the DC voltage power dis-
tribution path.
Monitor External DC Power Supply – With an external supply, power is applied to pins 3 (positive) and 7
(negative) on the external connector (see Figure 42). The power then goes through an electromagnetic
interference (EMI) filter on the PIO Board. This filter reduces the chance that external noise sources asso-
ciated with the external power source can disrupt H-ADCP operation.
Sentinel Internal Battery Packs – Each internal battery pack uses 28 alkaline "D" cells. Each pack supplies a
nominal output voltage of 42 volts open circuit when fresh. The diode-isolated battery packs can only
power the H-ADCP; they cannot "charge" each other.
Mariner Deck Box – The deck box automatically scales the input voltage to the proper level. No special
jumpers or switch settings are required to select the input voltage. If more than one power source is con-
nected to the deck box, the highest voltage source will be used. Although this is not recommended, it will
not damage the deck box.
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EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
WorkHorse H-ADCP Operation Manual