Digital Filter Timebase

[MarcelK]

I'm using a PCIe-6351 X-series card with DAQmx 9.7. Currently I'm playing around with the digital bus filter (an awfully under-documented feature) and tried to set the filter timebase source to an unused signal... signal was aquired as before. I then tried to set the source to complete nonsense... again no error at all and the same signal. Is that option a placebo or what is going on?

What I did is something like this, error handling and surrounding code removed:
 

const char *chan = "/dev1/port0/line0";
[...]
DAQmxSetDIDigFltrTimebaseSrc(taskHandle, chan, "dshfjdskfhjkdsfh");
DAQmxSetDIDigFltrTimebaseRate(taskHandle, chan, 1000.0);

DAQmxSetDIDigFltrMinPulseWidth(taskHandle, chan, 0.00512);
DAQmxSetDIDigFltrEnable(taskHandle, chan, TRUE);
DAQmxSetDIDigFltrEnableBusMode(taskHandle, chan, TRUE);

Regards, Marcel

[mmadl]

do you really need an external timebase source? maybe you could try to use the fixed values  (90 nS, 5.12 µS, 2.56 mS) suggested by the DAQmx help (http://zone.ni.com/reference/en-XX/help/370466V-01/mxdevconsid/digfiltxseries/) to begin with? 

[MarcelK]

I develop a signal processing language that uses DAQmx for data aquisition. I have no idea what my users may want to do with it in the end and I don't want to artificially limit them. Also, I'm simply curious. The fixed values might be enough for many use cases, but still I can imagine some developers prefering an external latch signal when it's available by the hardware anway.