Operation
3.13.2 Curve Breakpoints
Temperature response data of a calibrated sensor must be reduced to a table
of breakpoints before entering it into the instrument. Each breakpoint
consists of one value in sensor units and one temperature value in kelvin.
Linear interpolation is used by the instrument to calculate temperature
between breakpoints. From 2 to 200 breakpoints can be entered as a curve.
The instrument will show an error message on the display if the sensor input
is outside the range of the breakpoints. No special endpoints are required.
Sensor units are defined by the format setting in Table 3-7.
Breakpoint setting resolution is six digits in temperature. Most temperature
values are entered with 0.001 resolution. Temperature values of 1000 K and
greater can be entered to 0.01 resolution. Temperature values below 10 K
can be entered with 0.0001 resolution. Temperature range for curve entry is
1500 K.
Setting resolution is also 6 digits in sensor units. The curve format
parameter defines the range and resolution in sensor units as shown in
Table 3-7. The sensor type determines the practical setting resolution.
Table 3-7 lists recommended sensor units resolutions. For most sensors,
additional resolution is ignored.
The breakpoints should be entered with the sensor units value increasing as
point number increases. There should not be any breakpoint locations left
blank in the middle of a curve. The search routine in the Model 211
interprets a blank breakpoint as the end of the curve.
Table 3-7. Recommended Curve Parameters
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