DAQ Trigger with AC

[Talo]

Hello to all,

I have a program for made measurement of four sensor in LabVIEW 8.0 and using a PXI system with one PXI-6133 DAQ card, I use one of the channels of the DAQ for the trigger of the other 3 channels. Each channel is connected to one sensor. The problem that I have, is than the Ubias of the sensor change with the time but very slowly, then I must to change the trigger range because I only want to storage the signal of the sensor when there is a change very fast in the voltage sensor output of the sensor.

Then, is there any form of change the type of the trigger to AC? because by this form the channel only detect very fast changes in the signal.

I see the datasheet of this DAQ and I think it is not possible.

Have someone any suggestions that how to do it???

I thought another way like use another channel to read continously the output of one of the sensor and check his Ubias and if it change change the trigger level, but I think that by this form I spend a lot of resources. (also I must to do the aquisition of this channel in parallel with the aquisition of the other 4 channel, Is not by this form???)

Please if some one have any idea or suggestion to help me.

Thankfully

Gonzalo De Francisco

[Johann.Wagner]

Hi,

see also link http://forums.ni.com/ni/board/message?board.id=250&message.id=27850

See best way is to set all 5 Channels to the fast one task and then decide with software timing when the fifth channel should be saved or analysed.

Or acquire with S card your fast 4 channels and with your second card the slow one channel you write me today in your email

With a sequence you can handle different triggering on same card but it´s to slow for your application...

Best Regards

AE Munich