WorkHorse Rio Grande ADCP User's Guide
P/N 957-6167-00 (January 2001)
page 13
7 Power
The Rio Grande requires a DC supply between 10.5 volts and 18 volts. Ei-
ther an external DC power supply or battery can provide this power. If you
are using a battery, use the largest rated amp-hour battery as possible. A car
battery should last one to two days powering a 600-kHz ADCP.
NOTE.
Check that the battery voltage is above 10 Volts DC. Rio Grande
ADCPs will work at 10 volts; however, batteries with voltages below 11
volts are at or near their end of life and are approaching uselessness.
7.1
Bench-Top Battery Power Requirements
While the WorkHorse is awake and responding to commands, it consumes
approximately 2.2 watts. A single internal battery pack supplies this power
level for about five days. When the WorkHorse is asleep, it consumes less
than one mw. A standard battery pack supplies sleep power for years. At
every opportunity, the WorkHorse will “sleep” to conserve power while de-
ployed.
7.2 Operation
Modes
The WorkHorse has two modes of operation:
command mode
, and
ping
mode
(also referred to as “Deployment Saver” Mode). Depending on what
mode the ADCP is in; it will go either to sleep or to resume pinging.
In the Command Mode
Whenever you wake up your WorkHorse, power dissipation increases from
less than one mw to around 2.2 w. If you leave the WorkHorse in command
mode without sending a command for more than five minutes, the Work-
Horse automatically goes to sleep. This protects you from inadvertently
depleting batteries.
In the Ping Mode
After you send commands to the WorkHorse that tells it to start collecting
data, the WorkHorse goes into deployment saver mode. If power is some-
how removed and later restored, the WorkHorse simply picks up where it
left off and continues to collect data using the same setup
.
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