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DAQ Task with AC

Hello to all,
I am working with LabVIEW 8.0 and one PXI-6133 Data acquisition card, now I have four channel that works with DC and the trigger is a level of the signal in one of this channel, but my problem is that the Ubias of my signal change with the time and It is very cost to call again each few time to recal the trigger level.
I think that it is possible to introduce a new channel only for control the trigger but I need that this channel work with AC for only have a trigger If I have a very fast change in my signal.
I don't know how I can create a new task for this AC trigger.
In other words I need one channel with his level of trigger but this channel is in AC this mean that it only have a change in the level of the signal if this change is made with one frequency very high.
Can some one help me???
Thankful
Gonzalo De Francisco
 
 
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Hi, there´s a possibility to trigger with AC-Coupling on PFI0, but unfortunateley not on the 6133.
See link below.


http://digital.ni.com/public.nsf/websearch/A9D60C3C694AAB0086256D6300546DED?OpenDocument

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