icListen AF User Guide
© December, 2017
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6
Additional Features of icListen
icListen
also contains some additional features that can aid with troubleshooting, deployment, and
operation of the device.
These features include: monitoring temperature, humidity, acceleration and magnetic field, measuring
battery charge state, wake from standby, producing buzzer patterns to indicate power up/down, time
sync, and network device discovery options for Ethernet
icListen
devices.
6.1
Temperature and Humidity
Temperature and humidity values are continuously measured internally in all
icListen
models.
The internal temperature of an
icListen
will generally be slightly warmer than the outside temperature
(more so when the unit is out of water). It is useful for determining if any temperature shocks are
experienced during testing. Rapid changes in temperature can result in a DC offset being introduced to
waveform data. In some cases the offset can be great enough to “clip”/”max out” the data. This effect is
expected and temporary, and knowing the temperature changes that the device experienced can help in
determining if this is occurring.
The relative humidity reading can be used to determine the seal quality of the instrument. A humidity
reading of 50% or lower is acceptable. If the reading is higher than this, it may indicate a leak in the seal.
6.2
Acceleration and Magnetic Field
Accelerometer and magnetometer readings are available for
icListen AF
. These values can be used to
monitor changes in the orientation of the instrument once it has been deployed.
6.3
Battery Monitoring
icListen AF
monitors the charge and state of the internal battery. This allows a user both to know when
the batteries have been fully charged, estimate how long the
icListen
will run from the internal battery,
and can be used to determine if there are any issues with the battery.
Note that the battery may not charge when the battery voltage is above 4V (approximately 90%). This is
normal behavior, and is done in order to prevent premature aging of the battery.
During normal operation the battery life of the instrument should be 8 or more hours, and when in
standby should be 4 or more days.
