DCCWiki, a community DCC encyclopedia.
| DCC Terms
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| DCC Components
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Accessory Decoder, Auto Reverse, Command station, Computer Interface, Consists, DCC Booster, DCC Ready, Decoder, Digital packet, How DCC works, Multifunction Decoder, Power supply, Speed steps, Throttle, XPressNet
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| General
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Address Partitioning, Ammeter, Analog Control of Model Railroads, Bus, Cab, Can Motor, Command Control, Coreless Motor, DCC, DCC in a Box, DMM, Distributed Power, Frog Juicer, Jump Port, LCC, Layout Command Control, Locomotive, Motor, Multiple Unit Consisting, OEM, Phase, Power Bus, Programming Track, Pulse Width Modulation, Rail Size, Serial User System Interface - SUSI, Slots, Standard Dimensions, Turnout Motors, Turnouts with Digital Command Control, Voltage Drop, Zero Stretching
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| Mobile decoder
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Analog Conversion, Back EMF, Decoder Connection Method, Decoder-Assisted Consisting, Digitrax Transponding, Ditch Lights, Dither, Energy Storage, FX Lighting, Functions, High-Frequency Decoders, Kick Start, Lighting Effects, Loco Momentum, Locomotive Interface, NMRA Connector, NMRA DCC Plug for Multifunction Decoders, Power Conversion, Programming Lock, Programming Modes, Quartering, Silent Drive, Snood, Speed Table, USP, XOR
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| Non-DCC
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Primary DCC Components
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| Short Definition
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Digital Multimeter, a multipurpose electrical measuring device.
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Device used to measure voltage, current, resistance and other electrical quantities. Very useful for troubleshooting electrical problems, as well as preparing a locomotive for decoder installation. They may be handheld or a bench top model. The measurement is displayed digitally instead of using a needle indicating a value on a scale, as would have been seen with an analog VTVM.
Originally they were called an AVO meter (amps/volts/ohms) by their inventor. Later copies were called a multimeter, as it had multiple uses.
Note: They are not useful for measuring DCC voltages. They are designed to measure low frequency AC voltages, and present that information as the Root Mean Square Voltage. (RMS is used to represent the equivalent Direct Current heating value of AC Power). Since the DCC signal is a high frequency complex alternating current waveform, the resulting readings will be very confusing.
See DCC Power for more information. More information on selecting a Digital Multimeter is available on the Wiring Tools page.