Lionel ZW Volt & Amp meter attachment

gunrunnerjohn posted:

Hard to know what degree the guys that build these had, but I suspect not much experience with model railroading!

 However, given the fact that the ZW-C puts out a sawtooth waveform, I wouldn't count on the voltage measurement being all that accurate.  Hard to believe they are doing a true-RMS measurement in that meter assembly, so getting accurate readings of the sawtooth waveform probably isn't in the cards.

Use one strictly for building lights.

So 10 Volts on the meter may not be 10 Volts at the stud? Would it display higher or lower than the output?

gunrunnerjohn posted:

I'm sure it was a cost driven decision, and probably ignorance of how the transformer is used.  If you had them on the ABCD side, you'd have to have true circuit isolation for each current measurement channel.  Having them on the common U terminal side, there was no extra isolation needed.  That just wasn't a workable solution for the way the transformer is used in 99.9% of the installations.

When placing the ammeter on the U common connection bar you get an idea of the total current draw on the transformer. I consider this somewhat useful as you could always turn on each channel one by one, run it separately and see the current draw.  Of course an ammeter on each channel is better but how many times do operators watch for current draw?

Builder of the Hill Lines ( New Delta Lines). Recreating history for the model RR community.

Dennis LaGrua posted:

Of course an ammeter on each channel is better but how many times do operators watch for current draw?

More often than I look at the voltage!  Current from the transformer is more important to me, that tells me a lot more than the fact that my PH180 brick is putting out 17.8 volts.

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