PWM pulsing LED hooked up to DAC and Oscilloscope

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i have spi bus connecting arduino, xmega xprotolab mini oscilloscope , ad420anz 16-bit dac. led connected potentiometer varies frequency 1-4 hz, pulsing of led speeds , slows down potentiometer turned. (the led in pin 9, using pwm pulse)
currently, have led hooked oscilloscope in channel 2 5v arduino in channel 1, , can see difference between pwm of led (on lcd can see duty cycle speed turn frequency up) , 5v analog signal oscilloscope (oscilloscope has built in dac converting 5v).

i wondering if feasible connect led dac, have convert signal digital analog, shift data dac oscilloscope via spi bus? want able compare 2 analog signals, not analog , digital signal.
also, using shiftin() , shiftout() work in case?

you want compare 8-bit, 490 hz pwm led, brightness controlled variable width pulses, against 16-bit, spi @ 4 mhz dac output, changing dc level?


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