LowPass filter with "NiDAQmx.dlb" and VB6?

[pacheco]

Hello,

I am using a PCI 6251, with VisualBasic 6 and the  "nidaqmx.dlb". (No Measurement Studio here !)

I am trying to use a LowPass filter to eliminate some noise in a 1kHz signal with these two friends:

"DAQmxSetAILowpassCutoffFreq" to settle the CutOff frequency

and "DAQmxSetAILowpassEnable" to activate it.

Is this suposed to be configured and activated right after creating tasks and AI channels?

Are these two properties enough to run the filter ?

Thank you, DAQ community

Nuno Pacheco

[Benjamin_C]

Hello,

Only some of the M-Series boards (as the High Accuracy - M Series boards and some of the Simultaneous Sampling - S Series boards) have a programmable analog lowpass filter.

The PCI-6251 does not have a programmable analog lowpass filter, the cut off frequency is fixed to 1.7 MHz and can't be changed or disabled. So you can't use the functions "DAQmxSetAILowpassCutoffFreq" and "DAQmxSetAILowpassEnable" with this DAQ device.

Best regards,