ohmmeter

[apadior]

Hi everybody,i need a help to make an ohmmeter using labview...any ideas??Thank you!!

[Dennis_Knutson]

What sort of hardware do you have?

[apadior]

nothing it must be just a program which takes values and find the resistance(Ω) with a button like speedmeter and make a graph from the type i=v/r.

[Dennis_Knutson]

What is a button like speedmeter? Do you mean a dial control? What code have you written so far? What it's your exact problem?

[apadior]

the button will be like a speedmeter an show me the value of resistance...i must give values for the I(Ampere) and V(voltage) and shows me the value of resistance which is based with the type r=V/I and then will give me the graph of V/I...Basic,i don't know how to do that i mean how to give the equation=V/I...i need help if somebody can make a such simply programm and send me...Thanks!!!!

[crossrulz]

So the input to your VI is the resistance.  You want to control the value of the resitance with a dial.  From there you want to create a I-V graph.

Am I interpreting your requirements correctly?

What values of I or V do you want to use?  You have to define one in order to get the other.

[apadior]

yes the input will be the resistance and i want to find the value of this...and this will be for a resistance in circuit...Thank you for your help!!

[apadior]

the valuew for the I and V will be random each time.

[crossrulz]

What you are describing is a very siimple VI.  You just have to define either your voltage or your current.  If you define voltage, then I = V/R.  You you define current, then V = I*R.  It is just some simple arithmetic.

Can you give an exact example of how you want this to look?

[apadior]

the speedmeter to be like this.....(the other labview programm which is in the picture is not for my programm)but the speedmeter which will measure the resistances will be like this...in my programm i want to to give values of resistances and take the final value of resistance for resistances in a circuit(R=R1+R2+....) and then make a graph with I-V....I will be very pleased if you try this...Thank you!!!