ACR Electronics SmartReader Plus Manual do Utilizador descarregar pdf (Página 106)

TrendReader Standard 2

2005 ACR Systems Inc.

A thermistor equation, as the name implies, will create an equation for a thermistor

temperature sensor. The equation is in the form a Steinhart-Hart equation, which is generally

acknowledged as the best equation available for making the thermistor response curve linear.

The basic form of the equation is as follows:

1/T = A + B*(LnR) + C*(LnR)^3

where:

T = temperature in degrees Kelvin (degrees Celsius + 273.15)

LnR = natural logarithm of the resistance of the thermistor (in ohms)

A, B, C = curve-fitting constants derived from measurement

Note that thermistor equations are created only for NTC (negative temperature coefficient)

thermistors.

Empty Equation

If you want to enter in your own specific formula, and not have

TrendReader Standard 2

create

an equation, select Empty Equation. This will create a shell for your equation. When the

wizard is completed, you will be taken to the editor window where you can enter in your

formula. For help on equation coding and examples, refer to

APPENDIX A Equation Language

7.2.4 Parameters

In the fourth step of the wizard, you enter the measurements you recorded or obtained from a

specification sheet to generate the equation. Note that this step is omitted if you selected an

Empty Equation.

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 197 198

Sem comentários

ACR Electronics SmartReader Plus Manual do Utilizador Página 106