Learning vi

[MWTK]

hi, this is my second post. i hope you guys can guide me. thx.

i have attached my first Labview VI ver 8.5.

what i am doing is to design a strain gauge sensor system.  

i dont know whether it's correct to use the stain conv function or not?

from the stain conv since the output is very small, so i wish to boost it up using the op-amp. how am i going to implement it (add in op-amp)? do we have op-amp in labview?

please guide. Thanks

[Pnt]

I don't know how a strain gauge system works, but i guess you get a sinusoid signal at it's output.

You can open the stain conv function to see if the math are those you need. (Probably they are)

An op-amp is used for many functions in electronics and can not have functions in programming languages.

This is a matter for multisim.

I guess you mean to use it, for amplifing the signal.

Just multiply your signal with a factor. 

[MWTK]

thx for your input.

could anyone tell me whether correct or not to use the stain conv function for designing the strain gauge system? or there is another tools / function to do it?

Please guide. thx

[MWTK]

anyone pls. Thx

[RavensFan]

Sure  it can work.  Did you try it?

But the question still remains, what kind of hardware are you using to read the strain?  What analog input cards, what signal conditioning?  The DaqMX functions have the ability to set up a strain task.  Once you put in your gage factors, it can do all the scaling for you.

[MWTK]

Hi,

i not going to implement any hardware on that as my goal is just to design a strain gauge system in VI (maybe i am wrong..please correct me).

And that's why i was asking if my mwtk.vi is correct or not by using the strain conv function?

Thanks.

[KrisnaWisnu]

Hi MWTK,

I have opened your VI and I can suggest you a few things. But before that, I would like to clarify something with you.

The code you have built, the objective is to simulate an amplification of strain gage right? in the unit of voltage right?

If the answer are yes to the two questions above, the VI you have created is not correct. The reason why, is because Convert Strain Gauge Reading.vi (STRAIN CONV) is not performing any amplification of the voltage received. But it will convert voltage into Strain units. Hence, if you want a linear amplification from Voltage to Voltage, you could just use the example below (which Pnt referred to you):

 

Please let me know if this solution works for you or not.

Sincerely,

Krisna Wisnu

Applications Engineer

NI ASEAN

Message Edited by Krisna Wisnu on 10-01-2008 08:23 PM