which NI-USB devices support DAQmx_Val_PulseTime ?

[flyweight]

Hello,

I use NI-DAQmx within a C++ application, and I would like to use "DAQmxCreateCIPulseChanTime" 

because I need to measure high and low state time proportion of a single digital input line...

For now I use a USB-6008 which does not support this functionnality

(the device must support DAQmx_Val_PulseTime property).

I can't find a way to know which devices support this, so can someone tell me where to find it?

thanks