Help: use ELVIS II+ generate PWM

[Cooperhuli]

HI, i an new to LabVIEW and i want to use ELVIS II+ generate PWM signal in vi. the signal should be 20 K Hz, 0-5 V. and i want to control its duty cycle.

thanks for help.

[Knoxberry]

Cooper,

From the ELVIS II User Manual: 

"For square wave mode, a triangle wave from the DDS is fed into a
comparator. By adjusting the reference voltage of the comparator, you can
control the duty cycle. The reference voltage is generated by a 10-bit DAC
circuit. You can adjust the square waveform output duty cycle in software
with the NI ELVISmx FGEN SFP."

Regards,

[Cooperhuli]

Thanks for help. Now I find a easy way to do it. I use signal simulator to create PWM and send scaled square wave to DAQ Assistant block. At last, I use Analog output to output PWM from ELVIS.

Thank you. 

[Cooperhuli]

vi