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Jerry,

The MTS system has a 20 volt AC transformer for power.. To get the peak voltage you multiply 1.414 times 20 volts & get 28.28 volts.. The command station probably has a bridge rectifier input & a H bridge output.. You will loose about 2 volts per section & this will give you about 24 volts track power.. As you can see this under the 27 volts the NMRA sets for HO & larger decoders.. We all know that Soundtrax in the large scale "Shay" will not work on MTS systems unless you drop the track voltage or put bridge rectifiers in the "Shay".. I you want to be real safe you could use a 18 volt transformer.. This would give you about 21 volts track power.. As long as the transformer has the same current rating there will be no problems..

BulletBob
 

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Jerry,

RMS is Root Mean Square.. This is the standard measurement for AC voltage.. Greg used a "true RMS meter", the differance being able to measurer any AC wave, such as the almost square wave DCC signal.. A RMS meter will measurer the voltage, but not correctly.. Can not help you with the Aristo-Craft stuff..

BulletBob
 

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Jerry,

On the Digitrax system you can get real close by measuring rail A to Gnd & rail B to Gnd on the DC voltage scale & add the 2 voltages together.. The reason this works is because the DCC voltage is a bi-polar signal.. 1 rail goes 0 to 12 volts positive & the other rail goes 0 to 12 negative..

BulletBob
 
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