You are free to pick any node you want as your reference node, but usually one or two nodes are the most reasonable candidates. That reference node is "ground" or "common" and is usually just indicated as "GND" or something similar. If you have Va, Vb, or other voltages with a single subscript, then what is meant is the voltage of that node with respect to some reference node. I hope that my explanation helps you to move forward on your evaluation of the software.Click to expand.They are derived from a more general naming convention. I'll file a defect report so we review how we automatically determine TMAX so it won't get to a state like this example. (Version 14 was automatically calculating TMAX as 1.25e-003) Run your simulation again and you'll now see the 1.155 A result in the multimeter. Click the Interactive analysis button in the toolbar to open up the analysis properties, and in the Interactive Simulation analysis > Analysis parameters tab look for the checkbox labelled Maximum time step (TMAX), place a check and let it set at 1e-005. In your evaluation of Multisim 14, you can quickly change this. Its accuracy was affected by using larger time steps. For the most part this change has worked as expected, however your circuit is a clear example of a negative effect of this change. In version 13, we modified this code in a way that it will let slower frequency circuits simulate faster in real time, we did this in order to speed up simulations as requested by users. The default simulation setting in Multisim is to let its engine automatically determine TMAX, the maximum allowed timestep.
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