S series DAQ board, more than one trigger source

[saschab]

Hi,

I would like to read data from all eight channels of the PXI-6133 board independently using analog input triggering.

That means, each channel should look for his trigger condition (threshold) and if it is met, the N samples for this should  be written to the file.

Actually, each channel seems to have his own analog trigger circuit, as shown on the analog input block diagram, but theDAQmx Reference Trigger (Analog Edge).vi doesn't accept more then one trigger source. Is it possible to configure more than one trigger source for this board?

[Johann.Wagner]

Should be possible like in my example - see *.doc and lv 8.5 vi

[Johann.Wagner]

here´s the vi - look that i create 2 low level daqmx task with different PFI lines and analog inputs

Best Regards

[Johann.Wagner]

it´s important to use daqmx 8.6 or currently 8.7.1 driver on following link because in past was problem with reference trigger in s serie

http://joule.ni.com/nidu/cds/fn/p/sb/navsRel/lang/de?q=daqmx

[saschab]

Hi Johann,

Thank you, but the example seems not to work, at least on my system. I have DAQmx 8.6. Actually, I already tried the same thing – to create two tasks, but I got the error message (Error 50103. The specified resource is reserved).

I looked at the S Series user manual more carefully. On the figure 3-1 an analog trigger detection circuit is shown for each channel. But on the figure 13-2 there is only one analog trigger for all channels with a multiplexer before it. It seems to be indeed not possible to trigger each channel independently.

Maybe a NI engineer could make a statement here?

Regards

Alexander

[Johann.Wagner]

yes after spoken with daq specialist it is that only one trigger. Advantage to other cards is each converter for each channel. But when you want doing hardware trigger indepently from each other channel you should do it for example with fpga card and the trigger is a comparison between voltages...

Best Regards