Dave,

the DIM 30 test signal as you described it passes through a 30 kHz low
pass filter. Therefore almost any square wave signal generator will
have a suffienctly fast rise and fall time i.e. slew rate for this test
since it will be limited by the 30 kHz LPF anyway. What makes you
think the slew rate of your test signal was not good enough? How did
you generate the square wave? Even if you had a "perfect"square wave,
after passing through a 30 kHz LPF it will have only a modest slew
rate.



Mark