Step response using USB 6215

[samtha]

Hi there

I am using DAQ 6215 (USB) to perform step response of a device, i am using transition and pulse measurement function to determine the rise time and fall time

but it doesnt seem to work for the frequencies below 0.5hz how can i solve this issue is there any other way and also how can i determine the settling time of the response signal please suggest me something i am attaching my VI just check it out thank you........

[Aaron_W.]

Samtha,

Thank you for posting on the NI Forums. If you are trying to charactize the step response of the device there would be several ways to do such a task.  When you say it doesn't work for frequencies below 0.5 Hz, what behavior are you seeing. I could not run your VI because you did not include the DAQ Overshoot1.vi's. 

As of right now you have no synchronization between your Analog Output and Analog Input, so you results will vary depending on the time differences between the two different tasks starting. 

Message Edited by Aaron W. on 10-22-2009 12:43 PM

[samtha]

Hi Everybody,

Thank you for the reply actual i have posted the same Question in the Real-Time Measurement and control but then again i thought i was supposed to post it here forgive me if i create any confusion but anyways i would really appreciate help from different resources now coming to the question

Hi Aaron i am sorry for missing out the sub VI's here i am attaching my vi with slight modification please check it out and suggest me something thank you.......

[Aaron_W.]

Samtha,

Doug, who posted to your other forum post, made some good suggestions. Try those out and let us know if you are still having trouble.