How can I randomize my stimulus pulse in LabChart?

You can configure a pulse which fires at random intervals within the Stimulator Waveform Customization panel. Access the Stimulator... from the Setup Menu and click the Customize button.

In the Segment parameters for a pulse segment, type the function 'random' into the End Delay value box. The 'random' function will pseudo randomly provide a value between 0 and 1. You can also include further arithmetic operators to change the randomization limits; for example, multiplying by 0.5 will randomize values between 0 and 0.5.  
For further technical assistance with this or any other issue, please contact ADInstruments Technical Support by clicking HERE.