Lowell MAT-1 Data Logger, Руководство пользователя

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Universal User Guide, Rev L, February 2022 51
9.4.1 Battery Life
The battery life of the MAT-1 logger depends on a range of factors of which the two most important are:
•
Recording Intervals: The higher the logging frequency the shorter the battery life.
•
Sensor Selection: Disabling sensors will extend battery life.
Table 1: Estimated Battery Life (Months) Under Various Scenarios for Continuous Use
Recording
Frequency
Enabled Sensors
Magnetometer
AND
Accelerometer
AND
Temperature
Magnetometer
AND
Accelerometer
Magnetometer
OR
Accelerometer
Temperature
Only
64 Hz 1.5 1.6 2.4 NA
32 Hz 2.3 2.6 4.2 NA
16 Hz 3.6 4.5 7.1 NA
8 Hz 5.3 7.3 11 NA
4 Hz 7.0 11 14 NA
2 Hz 8.3 14 17 NA
1 Hz 9.0 17 19 19
0.5 Hz 23 36 36 36
0.2 Hz 36 36 36 36
Other factors that impact battery life are:
•
Speed and power consumption of the microSD card : There is a considerable amount of variability
in the energy consumed by various cards and it is not obvious which cards will be best. For
example, faster and more expensive cards are not always better. Check with Lowell Instruments
if you plan on using an alternate card for a critical deployment.
•
Storage & operating temperature : High temperatures will increase the self-discharge rate of the
battery. Keep the logger below 25 ⁰C when not in use. Cold temperatures, - 10 ⁰C and below, will
reduce run time significantly.
•
Enabling the LED : The LED blinks with each temperature measurement. Turning off the LED will
extend deployments that have the temperature channel enabled by 5 to 10%.
•
Duty Cycle: By using the Burst Interval, the duty cycle of the logger can be reduced. This will
extend the battery life nearly proportionally to the duty cycle. Contact us if you have questions.
9.4.2 Safe Shutdown
The logger monitors the battery voltage and determines when the battery is nearly discharged. If the
logger detects that the battery is near the end of its life, it attempts to execute a “Safe Shutdown.”
During a “Safe Shutdown” the logger will stop logging and enter sleep mode to save power. Up to 32K
bytes of data may be lost during a safe shutdown, but by stopping logging before the battery is
completely exhausted, there is a reduced chance of corrupted data from a brown-out. If a logger
executes a “Safe Shutdown,” it will display “ Stopped - Replace Battery ” in the Logger Status Screen.