The SL200 logger and the SL200Log software have a number of features to prevent third parties from tampering with and/or falsifying the logged data. The security features are as follows:
1. The SL200 temperature sample memory and alarm event memory are read only in the SL200 hardware. This memory can only be written to by the internal data collection logic of the SL200. The end-user can not write to this memory externally using SL200Log or any other software.
2. Once logging has started, parameters such as sample rate, logging start time, logging sample counter, etc. can not be changed without first clearing the recorded temperature and alarm data. This prevents gathering many data samples at a fast sample rate and then lowering the sample rate to give the appearance that the data was recorded over a longer period of time. This feature is part of the SL200 internal hardware logic and is not SL200Log (or any other) software dependent.
3. The SL200 has two internal sample counters: The Current Sample Counter and the Global Sample Counter. These two counters can be used to guarantee that the SL200 data has not been cleared during a given period of time. The Current Sample Counter shows the samples recorded during the most recent logging session. The Global Sample Counter shows the total number of samples the device recorded since that last battery change. If you know the value of the Global Sample Counter when the logging session has started, you can guarantee that the SL200 data has not been cleared if the Current Sample Counter equals the difference between the starting and the ending values of the Global Sample Counter. The Current Sample Counter and the Global Sample Counter are available in the Logger Status window. These counters are read only and can not be written to externally.
4. The SL200 internal real time clock can not be changed during the logging session.
5. The temperature calibration data is password protected. This prevents a third party from recalibrating the unit to yield a false temperature reading and alarms.