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After reading a recent thread on multimeters being a useful and necessary tool for a layout I've purchased the Harbor Freight one gunrunnerjohn posted a photo of. Now my question now is what do I use it for and how? My background and knowledge of electricity amounts to little more than zero. Being a TOTAL electrical novice I know nothing about electricity and model trains and their associated layouts except you connect two wires from the transformer to the track, I'd want to learn more so I can have my trains zipping happily along the tracks performing at their peak with the correct amounts of electrical energy. I'm contemplating a two independent track set up runing DCS, TMCC, and conventional modes powered by my Z-4000. (At this stage, nothing fancy with switches, etc.) I also want to learn how to convert the lighting in my passenger cars, engines and buildings to LEDs, etc. So, people, what resources on building and maintaining layouts and also improving the electrical performance of locomotives (in either book or DVD format) would you suggest someone with no knowledge of electricity whatsoever get to start learning and eventually make good use of that new multimeter?

Thanks in advance for you suggestions and advice.

 

Original Post

A clamp on meter is simply clamped around ONE wire leading to the item you want to measure the power usage of.

Most of these meters need to be zeroed first.

Power up the meter and select volt or amp reading as desired. I generally start with the highest possible range unless the max is known, Like we know the Voltage to the track is less than 25 volts AC, So don't select a 100's range.

To Zero, separate out the wire you intend to measure, hold the meter next to that wire and hit the zero button.

Then clamp the meter around the wire and read the result, that is the voltage or current in that single wire.

Now, Volts or Amps is not the whole story.

Volts multiplied by Amps is Watts, that is Power.

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