Aquire two analog inputs & How to put in array

[Nitin_110051]

Hi ,

I am a new to labview ,please help me out in following Querry .

I am having DAQ card  6341 , I want to capture two signals as showed in image of analog type . whenevr the first signal is changing trasition from 0 v to 5v  i have to start capture the rising edges of secong signal & when first signal transit from 5v to 0v , I have to stop counting the edge of secong signal & store the counted value in array .

Please help me . I am scrating my head from long time in this .

Thanks & regards

Nitin

[GerdW]

Hi Nitin,

sounds like a rather easy data analysis problem: Use one signal to gate another one and then count pulses for each gate opening…

What have you tried so far, where do you fail?

Please attach your VI to have it commented by us!

[Nitin_110051]

Hi Gerd ,

Thanks for Reply .

Vi snapshot is Attached , Please have a look .

Can  you please guide me how to create this VI , step by step .

[GerdW]

Hi Nitin,

in contrast to your first picture you now only read one analog input. Where's the second one?

- Why do you invert the analog input signal? What's the reason to invert a voltage? What is the expected reult of that operation when your voltage switches between zero and 5 (ideally)?

- In the Pt-By-Pt functions palette you will find a function to detect edges of boolean signals. Use it to detect your pulses.

- Count the pulses, when your first analog input gives a HIGH level. There's also a function in the Pt-by-Pt-palette to help you with this…

[Nitin_110051]

Hi Gerd

It was a trial , I was doing don't go with the VI , I know it is totally wrong .

Can you please show me the symbol for detect edges for boolean signals ?

How to aquired both signals in daq card. whether i have to connect to analog inputs/ counter input ? please tell .

Thanks

Nitin  

[GerdW]

Here they are:

[Nitin_110051]

Hi Gerd

Will this work if i Use virtual terminal for two analog input ? 

Or the Block diagram You are showing just to get an idea about  Edge detector you was referring .

[GerdW]

Hi Nitin,

what is a "virtual terminal" to you?

[Nitin_110051]

Hi gerd

Sorry to disturb you again and again

You seems to be a good person .

I Hightlighted  red in check .png  , which i am not able to find in my fuction pallete.

Thanks

Nitin

[GerdW]

Hi Nitin,

see the point-by-point-functions BooleanCrossing and Increment…

Your "virtual channel" infact is a real channel of your DAQ hardware!

Why do you create a frequency measurement channel when you want to count pulses gated by a second channel?