How to control the looping time of the for loop in 10 microseconds in labview?

I need to create a +/- 9 volt square wave with period of 20us using a D/A card (Not NI card). I can write command to the card using outport provide by Labview. Right now, I can generate square wave with 4ms period which is limited by the resolution of the wait until next ms icon I used inside the for loop. Could anyone tell me how to control the execution time of the for loop to about 10 us? Your help would be much appreciated.

I'm not sure if this will hep, but this answer seems to answer this question
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=50650000000800000029410000&UCATEGORY_0=_30_%24_12_&UCATEGORY_S=0&USEARCHCONTEXT_QUESTION_0=microsecond+resolution+1ms&USEARCHCONTEXT_QUESTION_S=0

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Message Edited by tbob on 10-17-2005 01:00 PM
- tbob
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RampVoltage.PNG ‏8 KB

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How to control the looping time of the for loop in 10 microseconds in labview?

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