this mode the mc controls the following operational sequence 1 output to the display an acknowledgement of the request for the mode 2 output the initial temperature t1 recorded upon entry into the mode and save t1 for future comparisons 3 input each successive conversion from the adc output the corrected data to the display then compare the data to t1 testing for a significant temperature change defined in the present embodiment as greater than or equal to plus or minus 1 0 u00b0 c if there is no significant change continue this process once a significant change is detected the direction of that change is noted plus or minus 4 test each successive conversion from the adc and output to the display only those temperature equivalents which represent temperatures farther removed from t1 in the direction of the previously noted significant change than the last output to the display in this mode the instrument seeks the extreme of a temperature curve and once it is detected holds that data in the display until the mode is deselected by the user delta t m mode rate of change in temperature per minute mode in this mode the mc controls the following operational sequence 1 output to the display an acknowledgement of.