External reference for analog output on USB-6259

[JockeR]

Hi,

According to the manual the 6259 device can use an external reference for analog output.

My problem is that I can't find the setting to select it. The NI-DAQmx help says: "The external reference voltage settings are available as a Channel property in the Analog Output»General Properties»DAC»Reference Voltage".

But where do I find this setting? I'm unable to find it in both MAX and SignalExpress. Do I need to use LabView to access this property?

Or is the external reference feature not available on USB-devices?

Regards,

Joacim

[JockeR]

I've found that it can't be done in MAX, but it's possible in LabView.

However I can't get the "External", for the reference source, to work properly. Any suggestions?

[nyc_(is_out_of_here)]

deleted

[Klabbe]

Hi Joacim,

In the example, External Source is named Dev1/EXTREF. EXTREF do not exist on USB-6259. You need to use one of the two APFI channels.

E.g. Dev1/APFI0

If you already do that, any error messages? Or how does it not work?

Best regards,

Klas

[JockeR]

Found the problem.

I connected the external reference voltage to PFI0. After I switched to APFI0 it worked.

I also found a better example vi here.

Thanks for your reply.