AR 2000 Operator's Manual
79
• Initial Equilibration Time: Time at each set temperature, before readings are taken.
• Adjust Equilibration Time: Time after each adjustment to the Upper Heated Plate temperature, before
readings are taken.
• Average Time: Time after each adjustment, over which successive temperature readings are averaged
to provide a data point.
• Average Stable Tolerance: Range within
which two successive data points must fall
for the temperature to be accepted as stable.
• Gradient Zero Tolerance: Once stability is
achieved, the last data point is compared
with the set temperature. If the difference is
not more than the gradient zero tolerance, the
set temperature is accepted as the tempera-
ture value. If the difference is greater than the
gradient zero tolerance, a further adjustment
is made to the Upper Heated Plate tempera-
ture.
• Gradient Scale Factor: It is suggested that
the default value of 1.5 should be used unless
other information is available.
4. Click Next. A window similar to that shown in
Figure 7.14 is displayed. Follow the instructions
given. The Upper Heated Plate calibration box
and zero value plug are shown in Figure 7.18
below.
Figure 7.18
Upper Heated Plate Calibration Box (Left) and Zero Value Plug (Right)
Figure 7.17
Zero Value Determination Instructions
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