Difference between Real and Virtual Calculator

[simone_71]

The program is working on my real calculator with no problem.
the purpose of this program is to check and calibrate thermocouples.
the thermocouple is a sensor that is giving a resistance (in Ohm) changing with the temperature. PT100 is a thermocouple that give 100 Ohm at 0°C
PT1000 is a thermocouple that give 1000 Ohm at 0°C
They follow the equation:

R=D*(1+A*T+B*T^2+C*(T-100)*T^3)

where T is the temperature, D is the 0°C-resistance (100 or 1000) and the remaining parameters A, B and C are:
A = 3.9083E10^-3
B = -5.7750E10^-7
C = -4.1830E10=12 for t<0 or 0.0 for t>=0


Syntax:
RTD(r,t,d)
r= Reststance
t= Temperature
d=Thermocouple Type. the most common values are 100 or 1000


Example:
RTD(0,26.5,100) will give 110.397549938, that is the Resistance value for 26.5°C for a PT100 sensor

RTD(124.5,0,100) will give 62.1074171403, that is the Temperature value for 124.5 Ohm for a PT100 sensor