how to generate 2 Mhz frequency using pci-6259?

[ymayur]

hello, im trying to generate 2 Mhz frequency signal in labwiew software. but if i increase the frequency above 500 Hz it shows error "error 20061". plese find attachment with this post. n help me to remove the error.

[Steve289]

Hello,

It looks to me like the default sampling information on the square wave.vi is set to a sampling rate of 1000, your output will be limited to 500Hz.  The frequency output of the Square Wave.vi is limited to fs/2.  If I add a cluster constant for the sampling info and change the fs to 2000 then I can output a 1000Hz signal.

Hope this helps.

Steven M.

[JÞB]

You really are not going to get there with the PCI 6259.  Yes is has an update rate of 2.8MHz.  It also has a min rail-rail settle time of 2uSec.  This mean if you start going above 250KHZ the output simply cannot slew fast enough and will be distorted and attenuated.

[AnalogKid2DigitalMan]

Jeff:

Would a high speed buffer or schmidt (sp?) connected to the output improve performance?

-AK2DM