02-06-2009 03:52 PM
Hi all,
I have a continious signal of 1,5V with a repeat RF pulse . I need to start ramp voltage during the RF pulse. How can synchronise the ramp voltage on the RF pulse. Fréquency of signal is 500 HZ an the RF pulse has 0,8 ms duration. Frequency and duration would be change for other experiment.
Have you got idea to help me
Thanks
02-07-2009 11:10 AM
Nobody can help me ?
Here a copy of the signal that i need to treat. I need to made ramp voltage (1 or more) during the RF pulse.
02-18-2009 10:41 AM
Hello,
Can you give some more information about the ramp signal you have to generate?
What is the voltage and duration of the ramp.
With the information I have you can use a multifunction DAQ board to acquire signals. As the 500Hz signal is low frequency, this is not a problem for the multifunction DAQ boards.
Now you could use the analog triggering feature of certain Data Acquisition boards to determine the start point for generating the ramp. These special inputs on certain DAQ boards.
This could be done by start triggering. Once you have a signal which comes above the DC part of your measurement you start generating the ramp signal.
The digital representation of the ramp you have to generate, can be preloaded (possibly only partially) into a buffer on the DAQ board. So once you get above a certain input voltage, you start generating without the need to ask processor time. Everything is done on the DAQ board.
If you need advise on which hardware to use, please contact your local National Instruments branch (http://www.ni.com/contact).
They have qualified engineers who are willing to assist you in making the appropriate choice for you application.