How to measure the ramp time

[Pahee]

Hello Friends,

I have a small problem, Could you please help me to solve this?

During the current attenuation, I want to measure the ramp time (as shown in the image), I'm using USB 6009 for acquiring the signal

What's the easiest way to measure the mentioned time.

Thanks,

Rathan

[MikeS81]

Hi Rathan,

do you already have the data? You can calculate the two points and read the assigned timestamps. You can then calcualte the ramp time.

Mike

[Baji]

Try Cursors if you dont know the stating and ending points.

Message Edited by Baji on 07-22-2009 11:44 AM

[Pahee]

Hi, Mike, thank you very much foryour quick response.

The voltage waveform will be acquired throgh USB 6009. So I will have the waveform,

but the problem is how to convert the waveform graph to data (with time stamp), Is there any control in labview.

Since I'm new to LabVIEW I need some help from you.

How to choose the points, from the array and our own logic

Thank you,

Regards,

Rathan

[Baji]

You just plot the acquired data to the waveform graph and select the cursor to get the ramp time.

[Pahee]

Hello

This is a automated system, So I can't select the points manually, It should be automated, So I'm looking some ways to do it, please let me know, If you know any

Regards,

Rathan

[MikeS81]

Hi Rathan,

what are the conditions to calculate these points. You can calculate the gradient at each point and decide if this is the point you need.

Mike

[Pahee]

Hi Mike,

Yes ,you are right, I can calculate the gradient,

But the problem I'm facing, how to convert the Waveform data to array of data, as you mentioned array of daa should contain time stamp

Is there any control for converting waveform graph to array of data or could you please guide me to do this.

Thank you,

Regards,

Rathan

[MikeS81]

Hi Rathan,

use the "Get Waveform Components" function, select "Y" to get the array with your data. You can use the "Waveform to XY Pairs" function to get also an array of timestamps.

Mike

Message Edited by MikeS81 on 07-22-2009 08:57 AM

[Pahee]

Great Mike, Seems It will work

But How I can control the time dt, Sometimes I need the precision (dt - time between twio sample points) 0.001 seconds, sometimes 0.0001 seconds, how I can specify this time in Get Waveform Components

Thank you,

Best Regards,

M.Paheerathan