Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 92
You can also compute for yourself the coefficients by utilizing the resistance data from three
different temperatures evenly spread across the range of interest. This is a standard calculation
and there are several sites on the web that provide such a calculator. One such site is:
http://www.thinksrs.com/support/Therm%20Calc/NTCCalibrator/NTCcalculator.htm . This
calculator will compute A, B, and C given three resistance temperature pairs.
Lookup
Lookup uses a user seleced table and interpolation method to produce the desired value. The
supported interpolation methods are: linear, semilogY, semilogX, loglog.
The table must be generated on a PC (with Notepad, for example) and then uploaded to the
8310. The format of the data is X,Y pairs of data. Files should be created in comma separate
format, such as the following example:
10.22, 11.55
12.481, 20.999
15.0, 40.01
The extension of the file should be changed to .tbl before uploading. TIP: In Notepad, save the
file with the name in quotes, such as “MyTable.tbl”, and it will be saved with a .tbl extension
instead of a .txt.
The name of the file with the data is entered in the DataFile field, and it must reside on /flash
disk/.
Basic / Custom Processing Steps
Basic is not actually a seleection but includes any step defined by a Basic program. For instance
if you were to create a processing step using Basic called Time2 it would appear in the list as
Times2. Here’s how a Times2 processing step would appear in Basic:
REM Times2.bas - accepts a sensor reading
REM input and returns the modified value.
REM
REM Sensor reading fields we can change include:
REM .Time, .Name, .Data, .Quality,
REM .Units, .Alarm, and .Digits
REM
REM All custom processing step functions begin
REM with the prefix "PROC_":
REM
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