OMC-042 / 043 / 044 Data loggers
Users
’ manual
page 24
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Sample Interval: 5 seconds
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Data Log Interval: 10 minutes
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Send Interval: 3 hours
When the configuration is ready and the user disconnects the USB-Cable;
1. Data logger is switched into sleep-mode, and current draw is reduced to a minimum level.
2. The Sample interval of 5 seconds is discarded (except for special alarming modes), because this
interval is only active when the data logger is NOT in sleep-mode. So nothing happens until the Data
Log interval has reached his count. (So this happens on 0, 10, 20, 30, 40, 50 minutes every hour)
3. When the Data Log Interval count has reached his count, the data logger will awake from the sleep
mode, and will take a sample and stores the data on the SD-card. When the sample is taken, the data
logger goes into sleep-mode again. This is repeated, until the time has matched the Send interval. So,
in this example, this is 3 hours.
4. When Data Send interval is reached, the data logger will wake-up, and starts to send the previously
collected data (stored on the SD-card) to the server. So, in this example, every 10 minutes a sample is
taken, and every 3 hours, 18 samples are send.
Note:
So, the data logger does not perform any averaging. Even if the sample interval is much faster than
the data log interval, only one sample is stored.
The use of the sample interval is for evaluating proper behavior of the system, while the USB is
connected, and for special alarming modes. Because in that case, the sample interval is valid, and the
user can observe the value’s obtained from the sensor in real time. In this case, the user can evaluate
these values every 5 seconds.