Can I measure pulswidths with daqmx base and NI-USB6501

Can I measure pulswidths with daqmx base 1.4 and NI-USB6501? I can measure edges width this function: DAQmxBaseCreateCICountEdgesChan. But, when using DAQmxBaseCreateCIPulseWidthChan I always get an error message back (DAQmxBase Error: <err>Value passed to the Task/Channels In control is invalid).
I also cannot find any examples about this topic in the software on CD nor on the internet.
I also don't know what values to use for the float64 minVal and float64 maxVal arguments when using the pulse width function of above (see the NI-DAQ™mx Base 1.x C Function Reference Help).
Maybe my device (NI USB6501) cannot measure pulse width's and when it does measure pulse width's, what value will it give back? Seconds or ticks and what is the accuracy?
Ok, enough questions for now. Thank you in avance for answering.
D. Stollman

The USB-6501 counter is capable of falling edge edge counting
measurements only, so the type of measurement you wish to do is not
possible with that device.  The data sheet for the USB-6501 can be
found at the following link:
http://www.ni.com/pdf/products/us/20054920301101dlr.pdf
I believe the DAQPad-6015 and DAQPad-6016 USB devices are capable of
measuring pulse width, as well as many of NI's PCI data acquisition
devices.

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