If you only have a VOM (no duty cycle setting) you can use this formula:
Duty Cycle = [1 - (V{pin 3}/V{max})] x 100%
...to extract it.
edit: (Pin 3 is at X11 in this case and max = battery volts.)

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14