thank you bro，I have found what the wrong ,I have simulated too many times, causing the D drive to run out of space. I cleaned it up and the problem was solved.

https://forum.zmt.swiss/topic/175/user-defined-waveforms Linked thread illustrated the exact solution for the above problem.

@daolin_qu Could you please check that you are selecting the Nerve_ventral_root_spinal_T1_Brachial_plexus_ulnar_right_6 spline entity and not the nerve itself that instead is a surface mesh entity part of the anatomical body? Thanks!

@daolin_qu From the image you posted, I see that you haven't yet load the model, that's why you cannot run yet a simulation. You can do that by clicking on the 'Load Model' icon in the top panel. After that, you can assign sensors and run the simulation. The 'Load Model' initiates the discretization of the axon trajectory into compartments (electric circuits describing the electrophysiology of the specified axon model, i.e. SENN).

@sayimgokyar Thank you for the clear answer. I get it now.

Scaling method ref. Furse C M and Gandhi O P1998 "Calculation of Electric Fields andCurrents Induced in a Millimeter-Resolution Human Model at 60 Hz Using the FDTD Method" Bioelectromagnetics 19:293–299 (1998)

what is ARMA? FDTD is not adequate for any simulations where the wavelength is long compared to the object being modeled https://speag.swiss/products/semcad/modules/what-is-fdtd/

Re{Ez,exp(jβ)} is the real part of the z-component of the electric field and RMS{D(x,y,z,f(0))} is the root mean square of the displacement field which is defined as D = permittivity*E. You can change what you want to see in the properties tab of your screen.

yeah,thank you for your help,i realise i can refer to other examples,There is a problem with creating voxels after separating the grid. Access Cheesecake cannot view voxels. I wonder what the problem is and hope you can help me. I can add your email address, so that it is convenient to communicate with you.

hi i guess you could scale the voltage and field in a post-processing step. for that you could measure the current in your simulation (flux evaluator + current density), and then scale your field so the current reaches the desired value. you can also measure the impedance from the measured current.