In a nutshell, to calibrate a temperature probe we need to have three different measurements of temperature and resistance. These can be gathered experimentally, or taken from a manufacturers datasheet of the probes. These measurements are then programmed into an online calculator (see below), which generates the Steinhart-Hart coefficients. These coefficients can then be programmed into the controller on the System Settings page.
The system defaults use the following values. These were taken from the manufacturer's datasheet, which is attached below.
degF Resistance(ohms)
32 29481
104 5595
158 1991
And from the calculator, the coefficients are calculated as:
A=0.0010281797
B=2.3924024E-4
C=1.5657565E-7
To gather measurements experimentally, use a calibrated thermometer to find the temperature of a sample. Simultaneously use the Thermo Test page in the BCS-460 to find the measured resistance of the probe in the same sample. The probes are sensitive, so its better to take the measurement while its immersed in a liquid, as opposed to a free-air measurement.
Here's one online calculator to generate the coefficients, also linked off the main page of the ECC website.
http://www.thinksrs.com/downloads/progr ... ulator.htm (updated 02/17/2015 with new resource)
A BYO article that gives a good general description of thermometer calibration.
http://www.byo.com/component/resource/a ... techniques
