@Mallard4468 posted:FWIW...
I have a Z4000 and Z1000 hooked up so it was easy to do a quick test. One side of the Z4000 went from 0 to about 5 volts; the other side initially went straight from 0 to 10 - when I put an engine on the track, the lower limit was about 6 volts. Interestingly, my Z1000 went up and down much more gradually, starting/ending about 3 volts.
Remember, reading the voltage of the Z1000 with a conventional multimeter is likely not to give you an accurate voltage reading. Even the cheap true-RMS meters don't seem to read the chopped waveform outputs all that accurately.