Hello,
I am trying to use a USB-6356 card to acquire some high speed (~1MHz/Ch x 8 Channels) analog input signals. The signals are coming from blast gauges that will measure the shock coming from a controlled explosion. The challenge here is that the duration of the explosion is very short (way less than half a second), but the explosion could happen anywhere inside a 10 minute window. When the explosion does happen, having 2 seconds of pre-explosion data and 2 seconds worth of post-explosion data would be plenty
The specs of the USB-6356 say it can read up to 1.25MHz/Channel, and has a 32 million sample buffer. So as far as I can tell, at 1MHz/Ch x 8 Ch, I should be able to hold 4 seconds worth of data on the card. My problem though, is that I cant stream the data to my PC fast enough to log everything on the computer.
What I would like to do is to have the DAQ start reading data continuously, but have it overwrite itself continuously. Then when the explosion does happen, I wait 2 seconds, stop the acquisition, and take the data thats written in the buffer at that time.
On page 4-45 of the XSeries manual, however, it says that during continuous acquisition, if I dont transfer data out of the bus fast enough, it will fill up and I will get an overflow error. Is there a way to disable this error and just allow the overwrite since I dont need that data anyway? Or am I trying to do something thats simply not possible from a hardware perspective?
Thanks
Jimmy
