In article .com,
says...
I set up a 5.0Vpp 1.0ms positive going pulse with
a 50% duty cycle as measured on the scope and then attempted to apply
it to the input of the gate. As soon as I did this though the pulse
disappeared as though the gate's input was loading it down.

--
Dumb question - did you double check your pinouts on the 7486? Trying
to drive an output pin instead of an input with the pulse generator
could load it down. Pins 3, 6, 8, and 11 are the outputs, according to
http://www.abcsemiconductors.com/com...out/7486.phtml
--

Jerry Maple
General Dynamics C4 Systems
Scottsdale, AZ