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Most loggers can record values from a limited set of their channels. A logger with two temperature channels and one humidity channel can be setup to record just one of the temperature channels if this is all that is required.
Some channels use the readings from other channels on the same logger to improve their accuracy. This is known as compensation. The readings from a humidity probe will become inaccurate with changing temperature however if the temperature is also being logged, this value can be used to correct or temperature compensate the value read from the humidity probe. This means that if we are to log humidity we must also log a temperature channel in order to do the compensation. This means that when we select some channels for logging, others may automatically be turned on.
On some loggers the user can select a variety of readings. These are Point Readings at the end of the Sample Period, Average Readings over the Sample Period, Maximum Readings over the Sample Period and Minimum Readings over the Sample Period.
Some loggers that have High Resolution Channels allow the user to reduce the resolution of the channel so as to store more samples in the memory of the logger.
The Channel Setup section of the Start Logger tab of the Logger Control function allows the user to select the logging modes of each channel including Point, Average, Maximum, Minimum and High or Low Resolution if these settings are available for the particular channel.