HOBO Pendant G Acceleration Data Logger
3
Operation
A light (LED) on the front of the logger confirms logger operation.
The following table explains when the light blinks during logger
operation.
When: The
light:
The logger is awaiting an
Interval, Delayed, or Trigger
Start
Blinks once every eight seconds until
logging begins.
Logger is subjected to a
magnetic field
Blinks once every second when the
magnet is present, then (Normal mode
only) blinks rapidly three times when
logging begins.
The logger is logging in
Normal mode
Blinks once every one to four seconds
(the shorter the logging interval, the
faster the light blinks); blinks when
logging a sample
The logger is logging in Fast
mode
Blinks once every quarter-second
Mounting the logger
The provided mounting bracket offers two orientation options for
securing the logger to a rigid surface.
Secure the bracket to the object of interest, then use the mounting
screw provided to attach the logger to the bracket.
Protecting the logger
The logger can be damaged if the water depth rating is exceeded. The
depth rating is approximately 30 m (100 ft) at temperatures below
20°C (68°F), but is less in warmer water. Refer to Plot B for details.
Do not store the logger in the coupler. Remove the logger from the
coupler when you are not using it. When the logger is in the coupler
or near a magnet, it consumes more power and will drain the battery
prematurely.
Keep the logger away from magnets. Being near a magnet can cause
false coupler events to be logged. It can also launch the logger
prematurely if it is waiting for a trigger start.
Note! Static electricity may cause the logger to stop logging.
To
avoid electrostatic discharge, transport the logger in an anti-static
bag, and ground yourself by touching an unpainted metal surface
before handling the logger. For more information about electrostatic
discharge, visit http://www.onsetcomp.com/support/support.html.
Periodically inspect the desiccant and dry it if it is not bright blue.
The desiccant pack is located in the cap of the logger. To dry the
desiccant, remove the desiccant pack from the cap and leave the pack
in a warm, dry location until the bright blue color is restored. (Refer
to the “Battery” section for instructions on removing and replacing
the logger cap.)
Temperature range
Desiccant maintenance
schedule
Less than 30°C (86°F)
Approximately once per year
30° to 40°C (86° to 104°F) Approximately every six
months
Over 40°C (104°F)
Approximately every three
months
Factory calibration
The logger is factory-calibrated and does not require any additional
calibration. To verify proper calibration, check the logger’s status
(when it is not logging) in the HOBOware software to check the
logger’s response to gravity. When any of the axes are held
horizontally, you should see a reading close to zero. When held
vertically, with the arrow facing downwards, the response should be
close to 1
g
.
Battery
The logger requires one 3-Volt CR-2032 lithium battery. Battery life
varies based on the temperature and the frequency at which the
logger is recording data (the logging interval). A new battery
typically lasts one year with logging intervals greater than one
minute. Deployments in extremely cold or hot temperatures, or
logging intervals faster than one minute, may significantly reduce
battery life. Continuous logging at the fastest logging rate of 0.01
seconds (100 Hz) will deplete the battery in as little as one week.
To replace the battery:
1. Remove the two screws that secure the end cap to the case and
remove the cap.
2. Examine the desiccant pack that is tucked into the cap. If the
desiccant is not bright blue, put the desiccant pack in a warm, dry
place until the blue color is restored.
3. Gently tap the case to loosen the circuit board and remove it from
the case.
4. Carefully push the battery out of the holder with a small,
nonmetallic blunt instrument.
5. Insert a new battery, positive side facing up.
6. Return the circuit board and label to the case, carefully aligning
the circuit board with the grooves in the case so that the battery
faces the ridged side of the case.