FAQ:How do I measure Digital Command Control voltage?
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Because Digital Command Control uses a high frequency waveform, you cannot use a simple AC/DC meter. The cheapest solution is to build a simple circuit. Here's one circuit diagram, and here's a second one. Although it won't be 100% accurate, it will get you pretty close. A second solution is buying a DCC specific Volt/Amp meter from various DCC resellers, such as the RRampmeter from Tony's Trains.