How to avoid jitter in analog output(square wave) generation

[embedded systems engineer]

Hi all,<br> Iam working with PCI-6723 32 channels analog output,iam generating a square wave,sampling at 100ks/s.<br>ican able to generate upto 10kHz square wave.The wave form appears clean when it is below 1000Hz if i crossed 5KHz to 7KHz, iam getting jitter in the output square wave form,i have experimented with the digital filter but still the jitter is persisting,<br>since iam using 12 channels for such similar generations so i have fixed the sampling rate.100Ks/s.<br>kindly suggest me how to avoid this jitter in high frequency generation.<br><br>OS::WINDOWS 2000<br>HARDWARE PCI-6723.<br>I/O :SCB 68<br>NIDAQ:7.3<br>LABVIEW 7.1<br><br>kindly find the attached file.<br><br>Thanks and Regards<br>RAJESH

Untitled.vi:
http://forums.ni.com/attachments/ni/250/9408/1/Untitled.vi

[embedded systems engineer]

Hi ALAN,<br> Thanks for your reply, well the square appears to be overlapped ie one ON/OFF period another waveform tries to overlap, actually i planned to take a snapshot of my oscilloscope (tetronix) but since its not advanced one ,i have attached the file kindly look into it,you can observe the at some higher frequencies there is lot of difference between rise time and fall time.<br><br>Thanks and Regards<br>rajesh<br>alan actually iam decorating my front pannel do u have any sample layouts for coloring ,buttons kindy forward me .

Doc1.doc:
http://forums.ni.com/attachments/ni/250/9436/1/Doc1.doc