Onset UA-004-64 Operating Manual

HOBO® Pendant® G Acceleration Data Logger (UA-004-64) Manual

The HOBO Pendant G Acceleration Data Logger is a waterproof, three-channel logger with 8-bit
resolution and can record up to approximately 21,800 combined x-, y-, and z-axis acceleration
readings or internal logger events. The logger uses a coupler and optical base station with USB
interface for launching and data readout by a computer.

The logger can be used for a wide variety of experiments, demonstrations and field studies by
measuring dynamic acceleration resulting from motion, shock, or vibration. It can also detect

HOBO Pendant Event
Data Logger

Model: UA-004-64

Included Items:

• Mounting Bracket

• Screw

Required Items:

• HOBOware 2.x or later (go to
www.onsetcomp.com/
hoboware-free-download)

• USB cable

• Pendant Optic USB Base

Station & Coupler (BASE-U-1)

• Optic USB Base Station
(BASE-U-4) or HOBO
Waterproof Shuttle
(U-DTW-1) & Coupler
(COUPLER2-A)

Timebase Error (p pm)

25

-25

-50

-75

-100

-125

static acceleration of gravity, making it possible to measure tilt, activity, and inclination.

The logger uses an internal three-axis accelerometer with a range of ± 3 g based on micro­machined silicon sensors consisting of beams that deflect with acceleration. These beams are
arranged to act as a variable capacitor. As the beams move, the capacitance changes
proportionately. This capacitance change is converted to voltage, filtered and measured by the
logger, and displayed in the software in units of g-force.

Specifications

Measurement Range ±3 g; 29.4 m/s² (96.5 ft/s²)

Accuracy

Resolution 0.025 g; 0.245 m/s² (0.8 ft/s²)

Logging Interval

Time Accuracy ±1 minute per month at 25°C (77°F), see Plot A

Operating Range

Water Depth Rating 30 m from -20° to 20°C (100 ft from -4° to 68°F), see Plot B

Battery Life 1 year typical use in Normal mode;

Memory 64K bytes (approximately 21.8K combined x-, y-, and z-axis readings or

Materials Polypropylene case; stainless steel screws; Buna-N o-ring

Weight 18 g (0.6 oz)

Dimensions 58 x 33 x 23 mm (2.3 x 1.3 x 0.9 inches)

Environmental Rating IP68

0

-20 0 20 40 60

Temperature (°C)

Plot A Plot B

±0.075 g; 0.735 m/s² (2.41 ft/s²) at 25°C (77°F)

±0.105 g; 1.03 m/s² (3.38 ft/s²) from -20°C to 70°C (-4°F to 158°F)

1 second to 18 hours, 12minutes, 15 seconds in Normal mode

0.01 seconds (100 Hz) to 0.99 seconds (1.01 Hz) in Fast mode

In water/ice: -20° to 50°C (-4° to 122°F)

In air: -20° to 70°C (-4° to 158°F)

7 days logging at 0.01 seconds (100 Hz) in Fast mode

events)

The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).

40

30

20

Depth (m)

10

0

-20 0 20 40 60

Waterpro of

range

Temperature (°C)

10872-H

HOBO Pendant G Acceleration Data Logger (UA-004) Manual

Connecting the Logger to a Computer

The HOBO Pendant G logger requires HOBOware Pro or
HOBOware Lite and either of the following to connect to the
computer:

• Pendant Optic USB Base Station & Coupler (BASE-U-1);

OR

• Optic USB Base Station (BASE-U-4) or HOBO Waterproof
Shuttle (U-DTW-1); coupler (COUPLER2A)

If possible, avoid connecting at temperatures below 0°C (32°F)
or above 50°C (122°F).

1. Plug the USB connector on the base station into an available

USB port on your computer.

2. Insert the logger and the base station into the coupler, as

shown in the following diagrams.

For BASE-U-1, make sure that the logger is inserted in the
end of the coupler that has the magnet, and that the ridges
on the base station and logger are aligned with the grooves
in the coupler.

BASE-U-1 & COUPLER

Ridge

memory is full. Refer to the software user’s guide for complete
details on launching, reading out, and viewing data from the
logger.

Important: Do not cover the optical communication window in
the logger (shown in diagram above) with a label or sticker as
that may interfere with the communications with the base
station or shuttle.

Triggered Start

This logger can be configured to start at your command, using
the magnet in the coupler to trigger a start. (To log in Fast
mode, this is the only way to launch the logger.)

1. Use HOBOware to launch the logger with Using Coupler
selected. Remove the logger from the coupler.

2. Bring the logger and an empty coupler or strong magnet to
the deployment location.

Important: Any magnet can trigger a start. This can be helpful,
but it can also cause a premature start. Keep the logger away
from strong magnetic fields until you are ready to begin
logging.

3. When you are ready for the logger to start logging, insert
the logger into the empty coupler (or place it next to a
strong magnet) and remove it after three seconds.

LOGGER

Magnet

For BASE-U-4 or the HOBO Waterproof Shuttle, firmly insert
the optical end of the base station into the D-shaped end of
the coupler, and make sure that the ridge on the logger is
aligned with the groove in the coupler.

To BASE-U-4 or
HOBO Waterproof Shuttle

COUPLER2-A

Coupler lever (for use with
HOBO Waterproof Shuttle)

Optical

communication

window

LOGGER

Ridge side down

3. If you are using the HOBO Waterproof Shuttle, briefly press
the coupler lever to put the shuttle into base station mode.

4. If the logger has never been connected to the computer
before, it may take a few seconds for the new hardware to
be detected.

5. Use the logger software to set up the alarms, launch, and
read out the logger.

You can read out the logger or check its status while it
continues to log (in Normal logging mode only), stop it
manually with the software, or let it record data until the

Important: The logger will not launch if the base station is in
the coupler.

4. Verify that the logger’s light is blinking at least every four
seconds.

Sample and Event Logging

While logging in Normal mode, the logger can record two types
of data: samples and internal logger events. Samples are the
measurements recorded at each logging interval (for example,
x-axis acceleration every minute). Events are independent
occurrences triggered by a logger activity, such as Bad Battery
or Host Connected. Events help you determine what was
happening while the logger was logging.

Events are not logged in Fast mode.

Normal vs. Fast Logging Modes

When you launch the logger, you can choose between Normal
mode and Fast mode. In Normal mode, the logger’s fastest
logging interval is once per second. Normal mode is ideal for
applications involving tilt, activity, and inclination. These
applications do not require information about the dynamics of
the acceleration events, but rely more on the static
acceleration of gravity.

Fast mode allows logging intervals between 0.01 and 0.99
seconds (100 to 1.01 Hz), making it ideal for applications
involving vibration and shock. These applications are more
concerned with the dynamics of the acceleration events over
short periods, and would not be captured in Normal mode.

Important: Connecting the logger to the computer (or a
shuttle) when logging in Fast mode will stop the logger.

1-800-LOGGERS 2 www.onsetcomp.com