@gunrunnerjohn posted:Actually, if my 'scope isn't lying, all the Z-controller stuff, the Z-500, Z-750, and Z-1000 have pretty much the same looking chopped waveform, see sample below The Z-4000, OTOH, has a synthesized pure sine wave and for all intents and purposes can be considered a pure sine wave as far as our trains are concerned.
Z-Controller Z-1000 Half-Throttle Waveform
Z-4000 Waveform
The scope outputs are good information.
The clipped waveform is worse than just a clip, which would simply limit the sine-wave output to a constant value during each (positive or negative) half cycle, and that would be a better input for the electronics. It looks like the clipped wave may be the initial part of the sine-wave (at each zero-crossing) with the power being regulated by the duration of the pulse. The clipped wave rises abruptly to near its maximum value and is composed of higher harmonics than the pure wave - possibly not good for the durability of the circuits that it's driving.
MELGAR
