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used to produce “average” values. Where a logger has an unused interface, the related
channel can be disabled to reduce battery power consumption and the saving of
zero/null or erroneous data.
The LoLog series loggers have the options of analogue inputs or digital inputs (usually
used for meter pulse detection), or one of each. The inputs are monitored during logger
operation and are arranged as input channels. The ‘output channel’ is the measurement
data, consisting of a series of numeric ‘datapoints’.
For analogue channels, the LoLog logger will produce a datapoint which represents an
average value for the measurement over the preceding log interval.
For digital (pulse input) channels, the signal transitions (typically meter pulses from a
water meter, representing water consumption) require calculations of a different type
to be made to produce the datapoints. The logger again produces an average value as a
datapoint for each preceding log interval. However, to produce this figure the logger
either counts pulses or it can measure the time interval between pulses arriving.
The logger has a large but finite memory size (up to 64000 readings as standard, but
models with additional memory are available). The user can set the logger to either stop
logging when the memory is full of data, or to continue to record (by over-writing the
oldest data, which then becomes lost).
2.5 LOGGER ACTIVATION PROCESS (FOR FIRST-TIME USE)
The logger is normally shipped from the factory in an inactive state (referred to as
“stopped”by the IDT app, for these models) to preserve the life of the battery. Whilst in
this state, the logger still monitors the infrared communications window for any activity
in case someone is trying to communicate with it; it is mainly measuring and logging
functions that are suspended.
To use the logger, it must first be activated, by using the IDT app, as follows:
Check the recording status of the logger.
If it is in a “stopped” mode, the logger is inactive.
Tap on the Status line.
IDT will write the program settings back to the logger and
then cause the logger to re-start.
The logger will proceed through the states of “waiting”
and then “recording”, as described in the IDT user guide
(‘Logger recording status" section). Once in the state of
“recording” the logger has completed activation.
It then starts repetitively measuring from sensors and
recording data.
The logger may also be activated by modifying any existing program settings. Each time
the program is modified, the IDT app will save the settings to the logger and cause it to
re-start.
