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waveform graph problem

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Hi Butcher,

           I have applied your idea it works well for me, and one more doubt need to be cleared 

the thing is i need to apply a load in term of KN force and my system max load capacity is 200kN and max output signal is 10V i need to give a load on the beam KN/sec through oil pressurised drive valve for example if i need to give 100KN of force how much amount of voltage is to be given for the drive to occur i know it will be in terms of mv/v but i need a exact formula or relation to that if you get my point reply to me 

Regards,

Dinesh

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Message 31 of 95
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Hmm. A few confusing parts to your most recent message.


@dineshmeena wrote:

i need to apply a load in term of KN force and my system max load capacity is 200kN and max output signal is 10V


This sounds like it characterises a load cell, since you have an output signal. If you are measuring the force, then your max output signal will correspond (in principle) with the rated maximum, in your case, perhaps 200kN. Take note that the maximum rated force and the maximum force tolerated might be different.

 

If instead you mean it takes an input voltage between 0 and 10V to determine how much force to apply, then you have probably the same points but with input and output switched. Again, ensure that the maximum force expected at 10V is what you're reading, then probably the force exerted is a linear function of the voltage input.

 


@dineshmeena wrote:

... oil pressurised drive valve for example if i need to give 100KN of force how much amount of voltage is to be given for the drive to occur i know it will be in terms of mv/v but i need a exact formula or relation


If you want to apply half of the maximum force, input half of the maximum voltage. Again, be careful - you talk about KN/sec at one point - this isn't a force but rather force/second. I'm not sure that this would be a specified anything... at least, I can't think what kN/s would correspond with. Pulsed force? A strange idea, and would probably be characterised by peak force and pulse frequency instead.

 

When you read something written in mV/V, this is a sensitivity (also commonly used in relation to load cells). The point here is that the output of the load cell depends on the excitation voltage passed through the circuit. It tells you how many mV will be output per Volt of excitation, at the full rated output. Usually this is passed to an amplifier, which then magnifies the signal before you measure it with for example a DAQ board.


GCentral
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Message 32 of 95
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HI butcher,

     For example

     Maximum load capacity=1000KN

      maximum output signal in terms of mV is 100

 

if i got a measured ouput of 20mV, then i will get a 200 kN of force applies right?

 i have some relation here,

20mV*(1000kN/100mV)= 200kN am i right here?

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Message 33 of 95
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Right - although it still sounds like you're describing a Load Cell since you mention "output signal". Perhaps if you provided links to manuals/spec sheets for the hardware you're using we could give more specific information.


GCentral
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Message 34 of 95
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Hi butcher,

   Thanks for your reply and i will provide it to you for further clarification and ideas.

 

 

regards,

Dinesh

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Message 35 of 95
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Hi butcher,

      once again i need some idea for using list box instead of array bcoz i need to display it for 16 graphs seperately because by using the array control the array size go endless but i don't want that, what i was looking exactly is i need to display a 16 set of graph for each graph i need to display a values for each set of channel like you created before if i press a blank boolean button the seperate window would show which set of channel you want to display it for which graph? that;'s when i selected particular set channel for particular graph in X-Y graph it should display it, did you get my point? send me some idea, if you have and also we are using NI USB-6211 

 

Thanks in advance,

Dineshmeena

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Message 36 of 95
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Does this help you with selecting values? I don't really understand what you mean about extending forever - yes, an array can be extended, but you can set it to have only a certain number of values and just not show more...

 

In any case, here is a SubVI dialog that can be used to choose array indices. You should make the enum a typedef (I didn't so I wouldn't need to send two files - you definitely should if you use this) and then change the controls and indicators on the front panel to the typedef instead of the normal enum. Alternatively you can just recreate the VI.

 

Additionally, change the VI Properties (you can find these by right clicking on the icon in the editor window) and go to Window Appearance, and choose Dialog.


GCentral
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Message 37 of 95
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i can't open a file can you resend it 2013 compatible

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Message 38 of 95
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2013 version


If Tetris has taught me anything, it's errors pile up and accomplishments disappear.
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Message 39 of 95
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2013 version.


GCentral
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Message 40 of 95
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