NTC temperature sensor simulation

[HxcBarrigaHxc]

My name is Diego,  and have troubles with multisim

I have to make a simulation of an NTC sensor where R is related to T as follows:

In the simulation I have to obtain the curves as shown in the image:

using a circuit like this:

My teacher told me that I have to create an "special resistor" SPICE  model where B and T have to be inputs that dinamically  changes the value of resistance R and then make a DC swep simulation and get the Resistance of NTC vs Temperature graph

After that I have to use this circuit to linearize the sensor and obtain a curve where VR2 is a function of T (using B = 4000 and temperature changes from 270K to 323K)

My problem is that I just know the very basics of Multisim (Place the components then hit Play button and watch osciloscopes or multimeters). I dont even know what SPICE means and how it works, and I dont know how to obtain those graphs.

I hope that some of you guys could give a hand to learn more about using Multisim, I will really preciate your help

Thanks in advance

P.D. : I found a model of an NTC in this topic of the forum (the atached file in there):

http://forums.ni.com/t5/Circuit-Design-Suite-Multisim/How-do-I-make-generic-spice-models-work-in-mul...

But I don´t know how to change the parameters to fit to my job (for meB have to be 3 diferent values = 3 diferent curves and there B is a fixed value =3548 ),  also I noticed that If I hit the play button and measure the current across the NTC sensor I get 220uA so the resistance of that sensor @ 12°C is 12V/220uA=54.5KOhm but acording to the matematical relation for that specified example should be 17.2Kohm (aprox)

I´m using Multisim 12

[Tayyab_R]

Hi,

Without going into too much detail, the easiet thing you can do is to use the file from the previous post and edit the model of the NTC Component. To edit the model, double-click on the component and under the Value tab, click on Edit Model. Here you can enter your equation and then use this component for your circuit.

Hope this helps.

[HxcBarrigaHxc]

Do you know where can I find  Multisim Spice for Dummies or something? because I have no clue how can I get this done 

[Tayyab_R]

Hi,

Generally, Multisim allows users to build and simulate circuits even if they have no understanding of spice. I found an online article which tells more details about creating spice models for NTC's.

http://www.ecircuitcenter.com/circuits/therm_model1/therm_model1.htm

Hope this helps.