Oscilloscope runs very slowly

[Kyndal6]

Hello,

I am a new user with multisim and running circuit simulations altogether. I am trying to look at a simple square wave pulse with the following settings (below). I would like to look at this pulse over the span of 45 seconds or so. I am finding that the o-scope is running reallyyy slowwww. I can see when I adjust the timebase scale that the simulation is running in the micro-seconds range. How do I make it run at a rate of seconds? I have already tried adjusting the max time step under the "interactive simulation" settings. Is there another setting I can look into? 

Please let me know if you'd like to look at any other settings I have setup for this simulation. I believe I am running V14.2 of Multisim

Thank you for your help in advance!

Here are my o-scope settings:

[gabor_csipkes]

Hello, I don't know how the virtual oscilloscope in Multisim is implemented but I would consider two things:

1. The 1ps rise and fall times are very small compared to your period and are not realistic. I would set those to some more sensible value. For a 10s period, rise and fall times in the us or even ms range are plenty to obtain a square wave.

2. In a real oscilloscope the sample buffer length is finite and above a certain time base setting the oscilloscope will switch to continuous acquisition. It means that you will see a scanning/running waveform instead of a steady curve. This is also related to the sample rate. Again, it depends how much the virtual instruments mimics the real one.

[Kyndal6]

Hi Gabor, thanks for the reply. I was able to solve the issue by connecting EXT Trig on the Oscope to whatever I am measuring. In addition to that, I changed my interactive settings to TMAX = 1s and initial conditions set to zero. Changing the rise/ fall time of the input pulse didn't seem to make a difference, but that was handy info for real world simultions so thank you.