Use listbox to select multiple channels and display on the graph

[jwscs]

@mods ... perhaps someone can move these two posts here

http://forums.ni.com/t5/LabVIEW/Beginner-at-LabView-Load-Cell-Force-Measurement/m-p/3652598#M1026003

http://forums.ni.com/t5/LabVIEW/Beginner-at-LabView-Load-Cell-Force-Measurement/m-p/3652617#M1026008

thx

EDIT:

sorry .. wrong windows (now i am a real good example)

can't delete my post

[jwscs]

@mods ... perhaps someone can move these two posts here

http://forums.ni.com/t5/LabVIEW/Beginner-at-LabView-Load-Cell-Force-Measurement/m-p/3652598#M1026003

http://forums.ni.com/t5/LabVIEW/Beginner-at-LabView-Load-Cell-Force-Measurement/m-p/3652617#M1026008

thx

NOTE:

sorry .. posted this in the wrong thread, perhaps my post can be deleted there as well

http://forums.ni.com/t5/LabVIEW/Beginner-at-LabView-Load-Cell-Force-Measurement/m-p/3652619#M1026009

[RavensFan]

Both threads have now been merged into a single thread.

[dineshmeena]

Hi gerdw,

   I have sent you a actual vi for the application i need to perform, i have to acquire signal for Strain gauge, load cell and lvdt together, here i was using a usb 6211 DAQ card

Load cell capacity is 200kN

here is was using a signal conditioner of output signal range 0-10V 

how can i acquire a signal?

do i have to use RSE or NRSE mode for input configuration?

How can i acquire in terms of kN, microstains and LVDT in millimeter

is that more data i need to acquire a signal for strain and load cell?

Here i sent you a actual.vi and also i have attached a image file of the previous version using 8 channel analyse it.

if there is any modifications needed reply back.

Thanks in advance,

Regards,

Dinesh

[dineshmeena]

Here i have made a model vi to calculate a strain is that correct method? explain me

[GerdW]

Hi Dinesh,

Here i have made a model vi to calculate a strain is that correct method?

This VI is wrong/questionable/buggy in so many ways - no, it's not "correct"!

explain me

Why should we "explain" YOUR VI to YOU?

If you are unclear about functions: read their help!

Just one note: using this function to convert voltage values to strain is a good idea. But unless you use all those default parameters used for conversion you should actually wire them! (And I also wonder about using this function on different datatypes - and all of them are showing coercion dots…)

[dineshmeena]

now i have remodified it correct me if it is wrong or if it is true why i was having it in a negative values is that a default values i can get? and to convert it into a microsrain is that correct method get multiplied with 10^6.

Thanks in advance,

Regards,

Dinesh

[GerdW]

Hi Dinesh,

correct me if it is wrong or if it is true

I cannot comment on the values you use in your calculation - you get them from your setup/datasheets. All I can say is: you didn't wire Vex…

why i was having it in a negative values

Well, I don't know which values you are measuring. So I cannot check for any "negative values" you receive…

Why do you need to convert data to DDT and use SplitSignal when there is a simple IndexArray function?

[dineshmeena]

Hi gerdw,

       I was measuring a Strain using foil strain gauge it has max strain capacity of 1500 microstrains,

G.F 1.9-2.2, Rg is 120+0.5ohms and excitation voltage is 10v here my doubt is if i do a compression how much strain it will cause in terms of mv/V here in the data sheet they didn't provide anything about output in terms of voltage?

[GerdW]

Hi Dinesh,

if I remember correctly then the formulas were quite easy for known gauge factor, strain and excitation.

I guess you will get the mathematics right 🙂