Synchroniation of internal timebase

[Graziano]

is it possible to synchronize the internal timebase of 20 MHz of my PCI-6143 to an external reference?
Or is it possible to know how is derived the sampling clock from the base, to set it to a sampling rate which is easily obtainable from the timebase?

[RobertoBozzolo]

Does your card have an EXTCONV pin in the I/O connector?

If it has, you can use it instead of internal timing by setting it with DAQ_Config. This way you rely on external reference for all your acquisition task.

[AlessioD]

Hi all,
I have to correct the statement reported above.
The board being addressed here is a PCI-6143 which is supported only by NIDAQmx. Thus the DAQ_Config call is no longer valid since it belongs to the Traditional API.
At the following address you can find all the documentation available for that board.

http://digital.ni.com/manuals.nsf/webAdvsearch/9AC6D81BE7D752C386256EC9006929C2?OpenDocument&vid=niwc&node=132100_US

In particular, refer to the S_series Help>>Analog Input>>Analog Input Timing section to understand hoe to use an external reference clock.
For examples, please refer to the examples that are installed with your DAQmx Driver following this path on your machine
..\Program Files\National Instruments\NI-DAQ\Examples\DAQmx ANSI C\Analog In\Measu
re Voltage\Acq-Ext Clk

Regards,
AlessioD
National Instruments