Differences between the displayed temperature and the logged temperature

Program Menu > Differences between the displayed temperature and the logged temperature

Temprecord G4 loggers include a LCD display which shows the result of the most recently measured temperature.  This is updated each time the logger takes a sample.  The displayed value is the most recent measurement, but this value is subject to further processing before it is stored in the logger.  Under most conditions, the displayed value will be the same as the value that was stored in the logger, but there are some circumstances where they will differ.

If the temperature is changing rapidly in between sample instants, the stored value may "lag behind" the displayed temperature.  This effect is transient, in that it will normally never persist for longer than one sample past the interval while the temperature was rapidly changing.  Under conditions of normal use this effect will not be noticed, and we only bring it to user's attention because it might be noticed in artificial environments.

As an example, consider a test where a G4 logger is being validated.  The logger is programmed with a sample period of 1 minute and started.  Every minute, the value shown on the display is noted down.  During the test the logger is subjected to a burst of hot air from a heat gun (not a treatment we recommend!).  At the end of the test the logger is read and the logged values compared with the values noted from the LCD display.

The following table shows the test results.

See also:

Sample Period

Sample Rate Issues

Accuracy and Resolution