MDO3000 low pass filter - filter out pwm frequency

[r0d3z1]

Hello, I have an MDO3000 scope and I would like to see the sinusoidal voltage and current of a motor control board. They are obtained with a 20khz pwm and putting the voltage probe between two phases I obviously see the modulated signal (carrier+modulating signal). Is there any function on these scopes series that allow to visualize only the modulating signal ?
I need a low pass filter or some other trick that allows me to remove the signal component at PWM frequency.

This picture from lecroy shows the function that I am looking for

Thanks

[rf-loop]

Just for example using some other scope.
Perhaps MDO3000 have some math..
Sometimes Math can help (integration in this case). Not perfect solution but... just for example about other ways to display something...

Signal to Ch1 is  around 1MHz carrier. 1st image PWM using 20kHz and 2nd image 100Hz sine modulating with around 48% duty deviation.



~1MHz, PWM ~20kHz sine


~1MHz, PWM ~100Hz sine

[r0d3z1]

Thanks, integration is a good solution for a symmetrical signal centered in 0. Unfortunately it doesn't works well for noisy signal like the current sensed by a shunt resistor.
Still looking for a better solution. As last option I will opt for data export and external filtering, however it isn't fast as a  dedicated scope function.