6025E analog triggering

[Tree]

Hello,

I am trying to use an analog trigger to start my continous analog input recording task (writing analog input to a file). I am having difficulties using NI-DAQmx 7.1 and the example program
"VC_AcqIntClkAnlgStart". When I execute the program, I receive the error:

DAQmx Error: Requested value is not a supported value for this property.

Property: DAQmx_StartTrig_Type
You Have Requested: DAQmx_Val_AnlgEdge
You Can Select: DAQmx_Val_DigEdge, DAQmx_Val_None

Task Name: _unnamedTask<0>

Status Code: -200077

Why is this occuring? Does the 6025E not support analog triggering?

Also, does the NI-DAQ 7.1 driver provide support for writing analog input data directly to a file? That would be really useful 🙂

I am using Wind
ows 2000, Microsoft Visual C++ 6.0, NI-DAQ 7.1.

Thanks NI support team for all of the help you have given me over the past couple months.

- Tree

[JB]

Why is this occuring? Does the 6025E not support analog triggering?

Your assumption is unfortunately correct : analog triggering is not supported by this DAQ card.

If you don't want to change the card, one solution (providing that the trigger level is always the same) would be to connect the signal to an external comparator and then to configure the acquisition to start with a digital trigger.

[JDesRosier]

Tree,

No, this board does not support analog triggering.

The NI-DAQ 7.1 driver does support direct file writing to disk. There is a traditional DAQ function called "DAQ_to_Disk" that performs a synchronous, single-channel DAQ operation and saves the acquired data in a disk file. I think that this function may be of use to you.

For more information about DAQ_to_Disk, go to your desktop, click [Start]>>[Programs]>>[National Instruments]>>[NI-DAQ]>>[Traditional NI-DAQ Function Reference Help] and search for "DAQ_to_Disk".

I hope this helps! Have a great day.

Kind Regards,

-Joe Des Rosier-
National Instruments