Logger Memory - ACR Electronics SmartReader Plus Reference Manual

SmartReader Plus Data Loggers
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*Note that the logger will stop recording (go dormant) when you communicate with it.
Therefore, if you want to perform fast sampling with the logger connected to your
computer, you need to turn off Realtime.
To ensure that the logger takes data at the correct time, it is best to use the delayed start
feature. The logger will begin to take readings when you connect the power source, providing
the start delay has expired. Otherwise, the logger will start when the start delay times out if it
has external power applied to it prior to the timing out of the start delay. Therefore, you need
to set the start delay long enough for you to have time to save the setup and, if necessary,
disconnect the logger and connect the battery pack or power supply. If you disconnect the
logger, first set a delay of at least 16 seconds, then disconnect the logger within 8 seconds for
proper operation.
When you are using sample rates as short as 0.04 seconds, you can run out of logger
memory very quickly (two active channels at 0.04 seconds gives you 7 minutes and 10
seconds of memory). It is important that you do not waste any logger memory by starting the
logger too soon or by leaving unused channels active.
To set the logger for fast sampling, click on the Mode field and select Fast. Next, click on the
desired time unit and select the value from the drop down list.
1.2.1.2

Logger Memory

The Memory subsection indicates how the data is stored in memory and what the start and
end times (or capacity) are for the data logging. In the FIFO (First In, First Out) mode, the
logger continually stores data and when the memory limit is reached, the new readings start to
overwrite the oldest readings. In this method, the logger is always collecting data, but only
saves the most recent data in its memory. In the Stop When Full mode, when the memory
limit is reached, the logger stops recording.
The capacity, or length of time for data capture of the logger is determined by the logger
model, the number of active channels, and the sampling rate. Loggers come in 3 memory
models: 32KB, 128KB, and 1.5MB. (If you want, you can choose to use only a portion of the
available memory when you select the end time for the data capture). To find out more about
how the capacity is affected by the sample rate and active channels, see Appendix E Sample
Rates.
To set how the logger stores its data, click on the Usage field and select FIFO or Stop When
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