I have set up a buffed edge counting which works fine with our E-series
boards. Using a new NI 6229, however, the same program returns
minimally 1 count.
It seems that in the case that the signal frequency is
lower than that of the timebase (in our case ctr0 is producing pulses at a
frequency of 1kHz, ctr0out->ctr1gate, signal to be measured arrives
at ctr1source) the card completely ignores the timing. Example: with
1kHz at the gate I would expect to read 1000 datapoints per second; if
the signal runs at a lower frequency than 1kHz I read a number of
datapoints corresponding to the signal frequency (all value "1").
At higher signal frequency it seems to work as expected.
I have tried a different BNC-2110 box and switching the order of the
counters (ie using ctr1 as timing device and ctr0 as the actual
counter), but this problem remains.
The cabelling has been done according to the NI-6229 port/pin scheme
found in the documentation directory of Labview. (ctr0out is BNC on the
box, ctr1gate=pin41=PFI4 on the box, ctr1source=pin42=PFI3 on the box;
for opposite configuration ctr1out as on box, ctr0gate=pin 3=PFI9 on
box, ctr0source=pin 37=PFI8 on box).
I would be very thankful for any help with this,
Gerhard
my apologies for the cross-post, but I put this question first up in the wrong discussion board.
