hsdio script delay

[QKD]

I am seeing a fixed (and very stable) delay between a script trigger and digital output.

With a 1MHz clock the delay is 33.5usec. If the clock freq is doubled the delay is cut in half, so it seems to be a fixed number of clocks.  I can work around the delay but I would like to know if it is possible to remove it.

I am using the 6562 hsdio board.

Message Edited by QKD on 03-05-2009 10:58 AM

Message Edited by QKD on 03-05-2009 11:00 AM

[Keith.Shapiro]

Hi QKD,

Unfortunately, there is no way to remove the delay.  Page 25 of the 6561/6562 specifications lists the following:

Delay from trigger to digital data output:

34 Sample clock periods + 85 ns

If you have a sufficient amount of memory on your card, you can reduce this time by increasing your clock frequency and using repeated samples in your waveform. 

Hope that helps,

Keith Shapiro

National Instruments R&D

[QKD]

Ok thanks. That is all I needed to know.