These are made in the same way as ordinary symbols except that you must place a Node marker to specify the position of the terminal's connection point, and a Label marker to specify the position and orientation of its net label. Quote ISIS permits the definition of user defined symbols for use as logical or physical terminals. But that's not surprising since the AC is 240V and the diodes are 0.7V or so, and pretty much invisible unless you zoom in. ![]() What we can't see, possibly because of the range settings, is the effect the bridge diodes have. ![]() The scope chC will be a rectified sinewave, double the AC frequency, which is what we see. Again, a chopped half-wave is appropriate, I think. Only the AC upper line can drive it, and only when it is positive with reference to both the lower line and ground (because the lower line is shorted through the bridge to ground. In the second (un-grounded) the scope reference is the bridge negative terminal. However, you might normally expect that be a rectified wave of double the AC frequency, but recall that here the lower AC line is grounded, so only the upper line is driving the rectifier and it never goes negative. The bridge is grounded on the negative side, so you will get a half-wave on chC. ![]() In the first (grounded) the scope reference is the lower AC line, so chB will show a sine wave (the AC waveform). I think those traces are appropriate for the circuits.
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