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.
Consult the manufacturer's documentation for a recommended method to check track voltage. Measuring across the rails with an AC voltmeter will not give a good result, with the reading varying with the signal content. Attempting to read a DC voltage will result in a reading of ≈ 0V. A DC voltage reading near the power supply voltage would indicate a failure within the booster.